Service Manual. Air Cooled Refrigeration Condensing Unit

Transcription

1 SiENBE Service Manual Air Cooled Refrigeration Condensing Unit LRLEQ5AY1(E) LRLEQ6AY1(E) LRLEQ8AY1(E) LRLEQ10AY1(E) LRLEQ12AY1(E) LRLEQ15AY1(E) LRLEQ20AY1(E) LRMEQ5AY1(E) LRMEQ6AY1(E) LRMEQ8AY1(E) LRMEQ10AY1(E) LRMEQ12AY1(E) LRMEQ15AY1(E) LRMEQ20AY1(E)

2 SiENBE Air Cooled Refrigeration Condensing Unit LRMEQ5AY1, 6AY1, 8AY1, 10AY1, 12AY1, 15AY1, 20AY1 LRLEQ5AY1, 6AY1, 8AY1, 10AY1, 12AY1, 15AY1, 20AY1 Air Cooled Refrigeration Condensing Unit 1 1 LRMEQ5AY1, 6AY1, 8AY1, 10AY1, 12AY1, 15AY1, 20AY1 1 LRLEQ5AY1, 6AY1, 8AY1, 10AY1, 12AY1, 15AY1, 20AY Introduction Standard Specification Standard Specification Set Values for Functional Components and Protection Devices Operation Limits Wiring Diagram Piping Diagram Description and Layout of Functional Parts and Piping Diagram Field Settings Field Setting From Outdoor Unit Description of Functions and Operation Operating Mode Outline of Functions Detailed Description of Functions Test Operation Refrigerant Piping Field Wiring Inspection and Pipe Insulation Checks after Work Completion Additional Refrigerant Charge Test Run Troubleshooting Checking Points at Servicing List of Malfunction Codes Checking Malfunction Codes by LED Lamps on PCB Checking Malfunction Codes of the Condensing Unit Troubleshooting by RAM Monitor Flow Chart for Troubleshooting Maintenance Appendix (Supplementary Information) Restriction Matter of Showcase Selection of Expansion Valve Trouble Case with Present Machine (R-407C) Option List Air Cooled Refrigeration Condensing Unit 1

3 Introduction SiENBE Introduction Safety Precautions Before performing design, construction, or maintenance, thoroughly read the "Safety Precautions" and also the "Installation Manual" and "Operation Manual" that come with this product. Precautions are classified as " WARNING" or " CAUTION" for the purpose of this Section. Items that mishandling highly potentially induces serious consequences such as death or serious injury are specially described under " WARNING". Furthermore, even items described under " CAUTION" potentially induce serious consequences depending on circumstances. All are important items for safety and must be followed without fail. Pictograms This symbol alerts you to precautions to be taken. Sections under this symbol provide the specific descriptions of precautions. This symbol alerts you to prohibited acts. Sections under or in the vicinity of this symbol provide the specific descriptions of prohibited acts. This symbol alerts you to mandatory acts or instructions. Sections under or in the vicinity of this symbol provide the specific descriptions of instructions. After the completion of construction or repair work, conduct test run on the equipment to check it for any abnormalities, and also explain precautions for use of the equipment to customer. <I. Precautions for Construction and Repair> WARNING (1) To overhaul the equipment, be sure to turn OFF all power supplies. Not doing so will result in an electric shock. To repair the equipment or check for circuits with power applied, pay utmost attention not to touch any live part. (2) If a refrigerant gas belches during work, do not touch the refrigerant gas. Doing so will result in frostbite. (3) To remove a welded part from the suction or discharge pipe of compressor, remove it in a well-ventilated area after thoroughly discharging a refrigerant gas. Not doing so will cause the refrigerant gas or refrigerant oil to belch, thus resulting in injury. (4) If a refrigerant gas leaks during work, ventilate the working area. If the refrigerant gas comes into contact with a flame, toxic gas will be generated. (5) The electrical parts of outdoor unit carry a high voltage. To repair these parts, thoroughly discharge electricity from the capacitor. Not doing so will result in an electric shock. 2 Air Cooled Refrigeration Condensing Unit

4 SiENBE Introduction CAUTION (6) Do not start or stop the air conditioner using the POWER SUPPLY switch. Doing so may result in a failure or water leakage. (7) Do not repair electrical parts with wet hand. Doing so may result in an electric shock. (8) Do not wash the air conditioner in water. Doing so may result in an electric shock or a fire. (9) Be sure to establish a ground for the equipment. Not doing so may result in an electric shock. (10) To clean the equipment, be sure to set the POWER SUPPLY switch to "OFF" to turn OFF all power supplies. Not doing so may result in injury because the internal fan rotates at high speeds. (11) To dismount the equipment, pay careful attention not to tilt it. Tilting the equipment may cause water remaining in the equipment to fall in drops, thus wetting goods kept in storage. (12) Check whether or not the refrigerating cycle part gets hot, and then repair the equipment. Not doing so may result in a burn. (13) Use a welder in wellventilated areas. Using the welder in an enclosed room may result in lack of oxygen. <II. Precautions for Equipment after Construction and Repair> WARNING (14) To repair the equipment, be sure to use parts listed in the List of Service Parts for the applicable model and proper tools. Furthermore, NEVER make any modification to the equipment. Not observing this warning will result in an electric shock, heat generation, or a fire. (15) To install or relocate an air conditioner, select a location capable of supporting the weight of the air conditioner. The insufficient strength of the location or improper installation of the air conditioner will cause the unit to drop, thus resulting in injury. Air Cooled Refrigeration Condensing Unit 3

5 Introduction SiENBE WARNING (16) Conduct electrical works according to information in the "Electrical Equipment Technical Standards", "Internal Wiring Regulations", and Installation Manual, and further be sure to use dedicated circuits. Insufficient capacity of the power supply circuit and faulty electrical works will result in an electric shock or a fire. (17) To make wirings between indoor and outdoor units, use specified wires to securely connect them, and fix them so that the external force of cables will not be transmitted to terminal connections. Imperfect connections or fixing will result in heat generation or a fire. (18) To make wirings between indoor and outdoor units or for power supply, form wires so that structures such as the service lid will not be lifted, and properly mount the lid. Improperly mounting the lid will result in heat generation of the terminal part, an electric shock, or a fire. (19) Do not cause damage to or process the power supply cord. Doing so will result in an electric shock or a fire. Putting heavy things on, heating, or pulling the power supply cord will result in damage to it. (20) Do not cause anything other than the specified refrigerant (e.g. air) to get mixed in the refrigerant system. Doing so will cause the refrigerant system to have abnormally high internal pressure, thus resulting in damage to the equipment or bodily injury. (21) Should the equipment have leakage of refrigerant gas, locate leaking points, and then repair them without fail. Subsequently, refill the equipment with a specified quantity of refrigerant. If no leaking points are located and thereby repair work is to be discontinued, perform pump-down operation, and then close the service valve. Not doing so will result in refrigerant gas leakage. The refrigerant gas itself is harmless, but if it comes into contact with a flame from a fan heater, stove, or stove burner, toxic gas will be generated. CAUTION (22) A ground leakage circuit breaker needs to be mounted. Mounting no ground leakage circuit breaker may result in an electric shock or a fire. (23) Do not install the equipment in places with the potential for leakage of flammable gas. Should a flammable gas leak to accumulate around the equipment, the gas may catch fire. 4 Air Cooled Refrigeration Condensing Unit

6 SiENBE Introduction <III. Precautions after Construction and Repair> WARNING (24) Check power supply terminals for deposition of dust or for any loose terminals. Deposition of dust on or imperfect connections of the terminals will result in an electric shock or a fire. (25) Be sure to replace flawed or deteriorated power supply cord or lead wires. Not doing so will result in an electric shock, heat generation, or a fire. (26) Do not connect the power supply cord halfway or with many loads of other electrical fittings on one electric outlet. Doing so will result in an electric shock, heat generation, or a fire. CAUTION (27) Check to be sure that the mounting positions and wiring conditions of parts as well as the connections of soldered parts and crimpstyle terminals are all normal. If any of these items is abnormal, an electric shock, heat generation, or a fire may result. (28) If the installation base or mounting frames are reduced in strength due to corrosion, replace them. Not doing so may cause the equipment to drop, thus resulting in injury. (30) After the completion of repair, be sure to make measurement of insulation resistance to prove that it is not less than 1MΩ. Insulation failures may result in an electric shock. (31) After the completion of repair, be sure to check the indoor unit for drainage. Insufficient draining from the indoor unit may result in the entry of water into a room, thus wetting furniture and household goods. (29) Check for the grounding state. If the ground is in an imperfect state, rectify it. Imperfect ground may result in an electric shock. Air Cooled Refrigeration Condensing Unit 5

7 Introduction SiENBE Air Cooled Refrigeration Condensing Unit Nomenclature Outdoor unit LR M E Q 5 A Y1 Power supply symbol Y1: 3φ V, 50Hz Indicates major design category Capacity indication 5: 5HP Refrigerant Q: R-410A Compressor type E: Intermediate INJ type Temperature zone to be used M: Medium temperature (MT) L: Low temperature (LT) Product category L: Low temperature air conditioner R: Outdoor unit 6 Air Cooled Refrigeration Condensing Unit

8 SiENBE Standard Specification 2. Standard Specification 2.1 Standard Specification Model 1 Standard Accessories Notes: H1 [ ] shows the anti-corrosion treatment type. H2 Rated conditions of the refrigeration equipment : Saturated temperature equivalent to suction pressure: -10 C Outdoor air: 32 C, Suction SH: 10 C H3 Measurement place: Front: 1m, Height: 1.5m 4 The minimum connection load with inside unit: 2.0kW LRMEQ5AY1 [LRMEQ5AY1E] LRMEQ6AY1 [LRMEQ6AY1E] Power Supply 3 phase 50Hz V Capacity 2 kw Range of Suction Pressure Equivalent Saturation Temperature C -20~+10 Range of Outdoor Temperature C -15~+43 Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)] Dimensions: (H W D) mm Heat Exchanger Cross fin coil Type Hermetically sealed scroll type Piston Displacement m 3 /h Compressor Number of Revolutions r.p.m Motor Output Number of Units kw Starting Method Direct-on-line (Inverter system) Type Propeller fan Fan Motor Output kw Air Flow Rate m 3 /min Drive Direct drive Connecting Liquid Pipe φ9.5 C1220T (Brazing connection) Pipes Gas Pipe φ19.1 C1220T (Brazing connection) Receiver Volume 5.4 Mass kg 175 Safety Devices High Pressure Switch, Fan Driver Overload Protector, Overcurrent Relay, Inverter Overload Protector, Fusible Plug Capacity Control % 33~100 24~100 Refrigerant Refrigerant Name R410A Charge Volume kg 5.2 Refrigerant Refrigerant Oil Name DAPHNE FVC68D Oil Charge Volume L Operating Sound 3 dba Installation Manual, Operation Manual, Connection Pipes, Clamps Air Cooled Refrigeration Condensing Unit 7

9 Standard Specification SiENBE Model 1 Standard Accessories Notes: H1 [ ] shows the anti-corrosion treatment type. H2 Rated conditions of the refrigeration equipment : Saturated temperature equivalent to suction pressure: -10 C Outdoor air: 32 C, Suction SH: 10 C H3 Measurement place: Front: 1m, Height: 1.5m 4 The minimum connection load with inside unit: 2.0kW LRMEQ8AY1 [LRMEQ8AY1E] LRMEQ10AY1 [LRMEQ10AY1E] LRMEQ12AY1 [LRMEQ12AY1E] Power Supply 3 phase 50Hz V Capacity 2 kw Range of Suction Pressure Equivalent Saturation Temperature C -20~+10 Range of Outdoor Temperature C -15~+43 Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)] Dimensions: (H W D) mm Heat Exchanger Cross fin coil Type Hermetically sealed scroll type Piston Displacement m 3 /h Compressor Number of Revolutions r.p.m 4320, , , 2900 Motor Output Number of Units kw Starting Method Direct-on-line (Inverter system) Type Propeller fan Fan Motor Output kw Air Flow Rate m 3 /min Drive Direct drive Connecting Liquid Pipe φ9.5 C1220T (Brazing connection) Pipes Gas Pipe φ25.4 C1220T (Brazing connection) Receiver Volume 8.1 Mass kg 255 Safety Devices High Pressure Switch, Fan Driver Overload Protector, Overcurrent Relay, Inverter Overload Protector, Fusible Plug Capacity Control % 17~100 14~100 13~100 Refrigerant Refrigerant Name R410A Charge Volume kg 7.9 Refrigerant Refrigerant Oil Name DAPHNE FVC68D Oil Charge Volume L Operating Sound 3 dba Installation Manual, Operation Manual, Connection Pipes, Clamps 8 Air Cooled Refrigeration Condensing Unit

10 SiENBE Standard Specification Model 1 Standard Accessories Notes: H1 [ ] shows the anti-corrosion treatment type. H2 Rated conditions of the refrigeration equipment : Saturated temperature equivalent to suction pressure: -10 C Outdoor air: 32 C, Suction SH: 10 C H3 Measurement place: Front: 1m, Height: 1.5m 4 The minimum connection load with inside unit: 2.0kW LRMEQ15AY1 [LRMEQ15AY1E] LRMEQ20AY1 [LRMEQ20AY1E] Power Supply 3 phase 50Hz V Capacity 2 kw Range of Suction Pressure Equivalent Saturation Temperature C -20~+10 Range of Outdoor Temperature C -15~+43 Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)] Dimensions: (H W D) mm Heat Exchanger Cross fin coil Type Hermetically sealed scroll type Piston Displacement m 3 /h Compressor Number of Revolutions r.p.m 5640, , 2900 Motor Output Number of Units kw Starting Method Direct-on-line (Inverter system) Type Propeller fan Fan Motor Output kw Air Flow Rate m 3 /min Drive Direct drive Connecting Liquid Pipe φ12.7 C1220T (Brazing connection) Pipes Gas Pipe φ31.8 C1220T (Brazing connection) Receiver Volume 12.1 Mass kg 355 Safety Devices High Pressure Switch, Fan Driver Overload Protector, Overcurrent Relay, Inverter Overload Protector, Fusible Plug Capacity Control % 10~100 9~100 Refrigerant Refrigerant Name R410A Charge Volume kg 11.5 Refrigerant Refrigerant Oil Name DAPHNE FVC68D Oil Charge Volume L Operating Sound 3 dba Installation Manual, Operation Manual, Connection Pipes, Clamps Air Cooled Refrigeration Condensing Unit 9

11 Standard Specification SiENBE LRLEQ5AY1 Model 1 [LRLEQ5AY1E] Power Supply 3 phase 50Hz V Standard Accessories Notes: H1 [ ] shows the anti-corrosion treatment type. H2 Rated conditions of the refrigeration equipment : Saturated temperature equivalent to suction pressure: -35 C Outdoor air: 32 C, Suction SH: 10 C H3 Measurement place: Front: 1m, Height: 1.5m 4 The minimum connection load with inside unit: 1.6kW LRLEQ6AY1 [LRLEQ6AY1E] Capacity 2 kw Range of Suction Pressure Equivalent Saturation Temperature C -45~-20 Range of Outdoor Temperature C -15~+43 Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)] Dimensions: (H W D) mm Heat Exchanger Cross fin coil Type Hermetically sealed scroll type Piston Displacement m 3 /h Compressor Number of Revolutions r.p.m Motor Output Number of Units kw Starting Method Direct-on-line (Inverter system) Type Propeller fan Fan Motor Output kw Air Flow Rate m 3 /min Drive Direct drive Connecting Liquid Pipe φ9.5 C1220T (Brazing connection) Pipes Gas Pipe φ19.1 C1220T (Brazing connection) Receiver Volume 5.4 Mass kg 175 Safety Devices High Pressure Switch, Fan Driver Overload Protector, Overcurrent Relay, Inverter Overload Protector, Fusible Plug Capacity Control % 33~100 24~100 Refrigerant Refrigerant Name R410A Charge Volume kg 5.2 Refrigerant Refrigerant Oil Name DAPHNE FVC68D Oil Charge Volume L Operating Sound 3 dba Installation Manual, Operation Manual, Connection Pipes, Clamps 10 Air Cooled Refrigeration Condensing Unit

12 SiENBE Standard Specification Model 1 Standard Accessories Notes: H1 [ ] shows the anti-corrosion treatment type. H2 Rated conditions of the refrigeration equipment : Saturated temperature equivalent to suction pressure: -35 C Outdoor air: 32 C, Suction SH: 10 C H3 Measurement place: Front: 1m, Height: 1.5m 4 The minimum connection load with inside unit: 1.6kW LRLEQ8AY1 [LRLEQ8AY1E] LRLEQ10AY1 [LRLEQ10AY1E] LRLEQ12AY1 [LRLEQ12AY1E] Power Supply 3 phase 50Hz V Capacity 2 kw Range of Suction Pressure Equivalent Saturation Temperature C -45~-20 Range of Outdoor Temperature C -15~+43 Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)] Dimensions: (H W D) mm Heat Exchanger Cross fin coil Type Hermetically sealed scroll type Piston Displacement m 3 /h Compressor Number of Revolutions r.p.m 4320, , , 2900 Motor Output Number of Units kw Starting Method Direct-on-line (Inverter system) Type Propeller fan Fan Motor Output kw Air Flow Rate m 3 /min Drive Direct drive Connecting Liquid Pipe φ9.5 C1220T (Brazing connection) Pipes Gas Pipe φ25.4 C1220T (Brazing connection) Receiver Volume 8.1 Mass kg 255 Safety Devices High Pressure Switch, Fan Driver Overload Protector, Overcurrent Relay, Inverter Overload Protector, Fusible Plug Capacity Control % 17~100 14~100 13~100 Refrigerant Refrigerant Name R410A Charge Volume kg 7.9 Refrigerant Refrigerant Oil Name DAPHNE FVC68D Oil Charge Volume L Operating Sound 3 dba Installation Manual, Operation Manual, Connection Pipes, Clamps Air Cooled Refrigeration Condensing Unit 11

13 Standard Specification SiENBE Model 1 Standard Accessories Notes: H1 [ ] shows the anti-corrosion treatment type. H2 Rated conditions of the refrigeration equipment : Saturated temperature equivalent to suction pressure: -35 C Outdoor air: 32 C, Suction SH: 10 C H3 Measurement place: Front: 1m, Height: 1.5m 4 The minimum connection load with inside unit: 1.6kW LRLEQ15AY1 [LRLEQ15AY1E] LRLEQ20AY1 [LRLEQ20AY1E] Power Supply 3 phase 50Hz V Capacity 2 kw Range of Suction Pressure Equivalent Saturation Temperature C -45~-20 Range of Outdoor Temperature C -15~+43 Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)] Dimensions: (H W D) mm Heat Exchanger Cross fin coil Type Hermetically sealed scroll type Piston Displacement m 3 /h Compressor Number of Revolutions r.p.m 5640, , 2900 Motor Output Number of Units kw Starting Method Direct-on-line (Inverter system) Type Propeller fan Fan Motor Output kw Air Flow Rate m 3 /min Drive Direct drive Connecting Liquid Pipe φ12.7 C1220T (Brazing connection) Pipes Gas Pipe φ31.8 C1220T (Brazing connection) Receiver Volume 12.1 Mass kg 355 Safety Devices High Pressure Switch, Fan Driver Overload Protector, Overcurrent Relay, Inverter Overload Protector, Fusible Plug Capacity Control % 10~100 9~100 Refrigerant Refrigerant Name R410A Charge Volume kg 11.5 Refrigerant Refrigerant Oil Name DAPHNE FVC68D Oil Charge Volume L Operating Sound 3 dba Installation Manual, Operation Manual, Connection Pipes, Clamps 12 Air Cooled Refrigeration Condensing Unit

14 SiENBE Standard Specification 2.2 Set Values for Functional Components and Protection Devices Compressor Fan motor PCB Inverter STD1 STD2 Electronic expansion valve Four way valve Solenoid valve Pressure protection device Thermistor Component Electric symbol LRMEQ5AY1,6AY1 LRLEQ5AY1,6AY1 LRMEQ8AY1,10AY1,12AY1 LRLEQ8AY1,10AY1,12AY1 Type M1C Overcurrent protection device 14.7A Type M2C Overcurrent protection device 13A LRMEQ15AY1,20AY1 LRLEQ15AY1,20AY1 Type M3C Overcurrent protection device 13A Output 350W 750W M1F Overcurrent protection device 1.5A 3.0A Output 750W M2F Overcurrent protection device 3.0A Main PCB A1P Standard:EB09058 PCB for compressor INV A3P Standard:PC PCB for fan INV A4P PC0511-3(A) PC0511-1(A) A8P PC0511-2(A) PCB for operation input A5P EB0568(A) PCB for noise filter A2P FN354-H-1(A) A6P EB0292(C) PCB for current sensor A7P EB0292(C) PCB for earth leakage detection A9P EC0726(A)-9 EC0729(A)-29 Coil Body Coil Body Coil Body Y1E (Main) Y2E (Gas) Y3E (M1C) UKV-A023 UKV-A023 UKV-A024 DC12V, 0.26A DC12V, 0.26A DC12V, 0.26A UKV-32D49 0~480pls UKV-A023 UKV-A023 UKV-A024 DC12V, 0.26A DC12V, 0.26A DC12V, 0.26A UKV-18D20 0~480pls UKV-A023 UKV-A024 DC12V, 0.26A DC12V, 0.26A UKV-32D49 0~480pls Coil STF-G01AQ531A1 STF-G01AQ532A1 STF-G01AQ537A1 Y3S Body STF-0404G STF-0713G STF2011G Coil Y2S NEV-MOAJ562D1 NEV-MOAJ562D1 Body (M2C) VPV-603D VPV-603D Coil Y5S NEV-MOAJ562C1 Body (M3C) VPV-603D Type ACB-1TB29W ACB-1TB28W ACB-1TB27W S1PH +0 Set value OFF MPa ON 2.85±0.15MPa Type ACB-1TB27W ACB-1TB27W S2PH +0 Set value OFF MPa ON 2.85±0.15MPa High pressure switch Type ACB-1TB27W Set value S3PH +0 OFF MPa ON 2.85±0.15MPa Type ACB-JB285 S4PH +0 Set value DC5V ON: MPa OFF: 2.16±0.15MPa Low pressure sensor S1NPL 150NH4-L2 200NH4-L2 200NH4-L2 High pressure sensor S1NPH 150NH4-H4 150NH4-H4 200NH4-H4 Fusible plug Open: 70~75 C Outdoor air thermistor R1T ST8603 Suction pipe thermistor R2T ST0602 Outdoor heat exchanger outlet thermistor R3T ST8602A Subcooling heat exchanger outlet thermistor R5T ST0601 Subcooling heat exchanger inlet thermistor R6T ST0601 R31T ST0901 Discharge pipe thermistor R32T ST0901 R33T ST0901 Fuse (A1P) F1U, F2U 250VAC 3.15A, Class T Fuse F3U, F4U 250VAC 1.0A, Class T Operation switch S1S AR22PR-311B Z9 Air Cooled Refrigeration Condensing Unit 13

15 Standard Specification SiENBE Operation Limits LRLEQ5, 6, 8, 10, 12, 15, 20AY1(E) Outdoor temperature ( CDB) Range for continuous operation Range for pull down operation Evaporating temperature ( C) 4D LRMEQ5, 6, 8, 10, 12, 15, 20AY1(E) Outdoor temperature ( CDB) Range for continuous operation Range for pull down operation Evaporating temperature ( C) 4D TES 1. Range for continuous operation SHOWS POSSIBLE RANGE OF CONTINUOUS OPERATION. 2. Range for pull down operation SHOWS POSSIBLE RANGE OF SHORT-TIME OPERATION. DO T SELECT THE MODEL IN THE RANGE FOR PULL DOWN OPERATION. TO BE MORE THAN 3 C/HOUR THAT THE TEMPERATURE OF INDOOR UNIT DROPS. DO T OPEN THE DOOR AND DO T ENTER THE GOODS IN PULL DOWN OPERATION AS MUCH AS. 14 Air Cooled Refrigeration Condensing Unit

16 SiENBE Standard Specification 2.4 Wiring Diagram LRLEQ5A, 6AY1(E) LRMEQ5A, 6AY1(E) L1 L2 L3 N POWER SUPPLY Y1: V 3N~50Hz Z10C N=4 GRN C1 RED A1P X1A F1U BLU BLK F2U Q1RP Z1C N=1 S1PH P< X1M L1 L2 L3 N A2P RED WHT BLK BLU RED GRN WHT BLU BLK X400A Z1F A9P X3A X1A T2A N=1 K4M F400U K3R X401A X403A X402A V1CP RED WHT BLK RY1 A3P X2A TE)10 X10A X1A K2M X61A X6A Z2C N=1 X28A P1 WHT L1R WHT P2 C66 C63 V2R K1R R95 PS N3 P3 X4A Z4C N=1 BLK RED A4P P1 X20A N1 R50 R59 X5A X5A F1U R10 X3A X4A Z3C N=5 V1R X11A t X41A X111A X1A Z5C N=1 V1R 5 X2A RED WHT BLK U V W R1T X1A X2A RED WHT BLK K3R K5R K6R K10R TES) 1. THIS WIRING DIAGRAM IS APPLIED ONLY TO THE OUTDOOR UNIT. 2. : FIELD WIRING. MS 3~ M1C MS 3~ M1F 5 3. : TERMINAL STRIP : CONNECTOR : TERMINAL : PROTECTIVE EARTH (SCREW) 4. AT THE TIME OF FACTORY SHIPMENT, SETTING OF "OFF". WHEN OPERATING, SETTING OF "ON" OR "REMOTE". THE POINT OF CONTACT OF THE INPUT MUST USE THE ONE FOR A SLIGHT CURRENT. (FOR THE REMOTE SWITCH, USE N-VOLTAGE CONTACT FOR MICROCURRENT (T MORE THAN 1mA DC12V)) 5. BE TED THAT THE CAPACITY OF CONTACT IS AC220~240V, 0.5A. (TOTAL OF CAUTION OUTPUT, WARNING OUTPUT) 6. BE TED THAT THE CAPACITY OF CONTACT IS AC220~240V, 0.5A. (OPERATING OUTPUT) 7. HOW TO USE BS1~5 AND DS1 AND DS2 SWITCH, REFER TO "SERVICE PRECAUTION" LABEL ON EL. COMPO. BOX COVER. 8. WHEN OPERATING, DON'T SHORTCIRCUIT THE PROTECTION DEVICE (S1PH). 9. COLORS BLK: BLACK RED: RED BLU: BLUE WHT: WHITE GRN: GREEN. 10. RY1 POINT CONTACT IS OPEN BEFORE TURNING ON POWER SUPPLY. REFER TO TECHNICAL GUIDE FOR THE OPERATION TIMING DIAGRAM. X2A X3A X4A TERMINAL OF M1C W U PS H1P H2P H3P H4P H5P H6P H7P H8P P< S4PH V X36A LAYOUT OF M1C, M1F BS1 BS2 BS3 BS4 BS5 HAP X7A X9A X10A X14A CONTROL, BOX ON DS1 DS2 X18A t R1T M1F ON OFF OFF S1NPL M1C X31A Y3S F4U F3U C C1 W1 P1 P2 X2M CAUTION OUTPUT TE)5 WARNING OUTPUT TE)5 OPERATING OUTPUT TE)6 IS CONNECTOR COLOR FOR PRINTED CIRCUIT BOARD. IS CONNECTOR COLOR FOR COMPONENT. IS DISCRIMINATION COLOR FOR COMPONENT LEAD WIER. X32A X21A BLK S1NPH 5 WHT BLK Y1E M A9P OUTER SHELL CONTROL, BOX S1S X2M A1P X22A Y2E X1A 5 M X2A A5P A5P X1M X3M X1A X66A X29A X30A X1M (FRONT) A B C t t t t t R31T R2T R3T R5T R6T S1S L1R A3P REMOTE OFF ON 4 1 A4P 3 2 TE)4 X3M SWITCH A2P 1 2 (BACK) A1P PRINTED CIRCUIT BOARD (MAIN) K3R MAGNETIC RELAY (CAUTION OUTPUT) S1NPL PRESSURE SENSOR (LOW) A2P PRINTED CIRCUIT BOARD (ISE FILTER) K5R MAGNETIC RELAY (Y3S) S1PH PRESSURE SWITCH (HIGH) A3P PRINTED CIRCUIT BOARD (INV) K6R MAGNETIC RELAY (WARNING OUTPUT) S1S OPERATION SWITCH (REMOTE / OFF / ON) A4P PRINTED CIRCUIT BOARD (FAN) K10R MAGNETIC RELAY (OPERATING OUTPUT) S4PH PRESSURE SWITCH (HIGH) A5P PRINTED CIRCUIT BOARD (ABC I / P) L1R REACTOR (A3P) T2A CURRENT SENSOR (A9P) A9P PRINTED CIRCUIT BOARD (EARTH LEAKAGE DETECTOR) M1C MOTOR (COMPRESSOR) V1CP SAFETY DEVICES INPUT BS1~5 PUSH BUTTON SWITCH (MODE, SET, RETURN, TEST, RESET) M1F MOTOR (FAN) V1R POWER MODULE (A3P, A4P) PS SWITCHING POWER SUPPLY (A1P, A3P) V2R DIODE BRIDGE (A3P) C1 CAPACITOR Q1RP PHASE REVERSAL DETECT CIRCUIT X1A, X2A CONNECTOR (M1F) C63, C66 CAPACITOR (A3P) R10 RESISTOR (CURRENT SENSOR) (A4P) X1M TERMINAL STRIP (POWER SUPPLY) DS1, DS2 DIP SWITCH (A1P) R50, R59 RESISTOR (A3P) X1M TERMINAL STRIP (OPERATION) (A5P) F1U FUSE (8A, DC650V) (A4P) R95 RESISTOR (CURRENT LIMITING) X2M TERMINAL STRIP F1U, F2U FUSE (T, 3.15A, 250V) (A1P) R1T THERMISTOR (AIR) (A1P) X3M TERMINAL STRIP (REMOTE SWITCH) F3U, F4U FUSE (T, 1.0A, 250V) R1T THERMISTOR (FIN) (A3P) Y1E ELECTRONIC EXPANSION VALVE (MAIN) F400U FUSE (T, 6.3A, 250V) (A2P) R2T THERMISTOR (SUCTION) Y2E ELECTRONIC EXPANSION VALVE (GAS) H1P~8P PILOTLAMP (SERVICE MONITOR-ORANGE) [H2P] MALFUNCTION DETECTION --- LIGHT UP R31T THERMISTOR (M1C DISCHARGE) Y3S SOLEID VALVE (4 WAY VALVE) R3T THERMISTOR (HEAT EXC, DEICER) Z1C~5C, Z10C ISE FILTER (FERRITE CORE) R5T THERMISTOR (HEAT EX, OF SUBCOOL OUTLET) Z1F ISE FILTER (WITH SURGE ABSORBER) (A2P) HAP PILOTLAMP (SERVICE MONITOR-GREEN) R6T THERMISTOR (HEAT EX, OF SUBCOOL INLET) K1R, K3R MAGNETIC RELAY RY1 MAGNETIC RELAY (A9P) K2M, K4M MAGNETIC CONTACTOR (M1C) S1NPH PRESSURE SENSOR (HIGH) 3D059917C Air Cooled Refrigeration Condensing Unit 15

17 Standard Specification SiENBE LRLEQ8A, 10A, 12AY1(E) LRMEQ8A, 10A, 12AY1(E) POWER SUPPLY Y1: V 3N~50Hz Z1C N=1 Z10C N=4 GRN C1 RED BLU BLK A1P X1A F1U F2U Q1RP S1PH P< RED GRN WHT BLU BLK A2P X400A Z1F F400U K4M K3R X402A X2A V1CP X401A X403A TE) 10 RED WHT BLK A3P X10A X1A K2M X61A X6A Z2C N=1 X28A V2R PS X4A X20A P1 WHT L1R WHT P2 C66 C63 K1R R95 N3 P3 Z4C N=1 A4P BLK RED P1 N1 Z3C N=5 R50 R59 V1R X11A RED WHT BLK U V W MS 3~ M1C t R1T X5A X41A X111A X5A X3A X1A Z5C N=1 X1A F1U MS 3~ M1F R10 V1R X2A 5 5 X4A X2A X2A X3A X4A RED WHT BLK K3R K4R K5R K6R K10R X1M L1 L2 L3 N RED WHT BLK BLU T2A N=1 Z6C N=1 S2PH P< A1 X26A K2M A2 RED WHT X1A T1A Z7C N=5 R S T K2M U V W K1R X5A X66A TERMINAL OF M1C, M2C W U PS H1P H2P H3P H4P H5P H6P H7P H8P P< S4PH V X36A LAYOUT OF M1C, M2C, M1F BS1 BS2 BS3 BS4 BS5 HAP X7A X8A X9A X10A X14A CONTROL, BOX M1F ON DS1 ON DS2 X18A t R1T M1C OFF OFF S1NPL M2C X31A Y2S Y3S F4U F3U C C1 W1 P1 P2 X2M CAUTION OUTPUT TE)5 WARNING OUTPUT TE)5 OPERATING OUTPUT TE)6 IS CONNECTOR COLOR FOR PRINTED CIRCUIT IS CONNECTOR COLOR FOR COMPONENT. IS DISCRIMINATION COLOR FOR COMPONENT LEAD WIRE. X32A X21A BLK S1NPH 5 WHT BLK Y1E M A9P OUTER SHELL CONTROL. BOX S1S X2M A1P X22A Y2E X1A 5 X2A M X1M A6P A5P A5P BLU WHT BLU K2M X3M X23A X1A Y3E X29A X30A X1M 5 M (FRONT) A B C t t t t t t R31T R32T R2T R3T R5T R6T S1S L1R A3P REMOTE OFF ON A4P X3M 1 2 TE)4 SWITCH A2P (BACK) A1P PRINTED CIRCUIT BOARD (MAIN) K1R MAGNETIC RELAY (K2M) S1NPL PRESSURE SENSOR (LOW) A2P PRINTED CIRCUIT BOARD (ISE FILTER) K3R MAGNETIC RELAY (CAUTION OUTPUT) S1PH, S2PH PRESSURE SWITCH (HIGH) A3P PRINTED CIRCUIT BOARD (INV) K4R MAGNETIC RELAY (Y2S) S1S OPERATION SWITCH (REMOTE/OFF/ON) A4P PRINTED CIRCUIT BOARD (FAN) K5R MAGNETIC RELAY (Y3S) S4PH PRESSURE SWITCH (HIGH) A5P PRINTED CIRCUIT BOARD (ABC I/P) K6R MAGNETIC RELAY (WARNING OUTPUT) T1A CURRENT SENSOR (A6P) A6P PRINTED CIRCUIT BOARD (CURRENT SENSOR) K10R MAGNETIC RELAY (OPERATING OUTPUT) T2A CURRENT SENSOR (A9P) A9P PRINTED CIRCUIT BOARD (EARTH LEAKAGE DETECTOR) L1R REACTOR (A3P) V1CP SAFETY DEVICES INPUT BS1~5 PUSH BUTTON SWITCH M1C, M2C MOTOR (COMPRESSOR) V1R POWER MODULE (A3P, A4P) (MODE, SET, RETURN, TEST, RESET) M1F MOTOR (FAN) V2R DIODE BRIDGE (A3P) C1 CAPACITOR PS SWITCHING POWER SUPPLY (A1P, A3P) X1A, X2A CONNECTOR (M1F) C63, C66 CAPACITOR (A3P) Q1RP PHASE REVERSAL DETECT CIRCUIT X1M TERMINAL STRIP (POWER SUPPLY) DS1, DS2 DIP SWITCH (A1P) R10 RESISTOR (CURRENT SENSOR) (A4P, A5P) X1M TERMINAL STRIP (OPERATION) (A5P) F1U FUSE (8A, DC650V) (A4P) R50, R59 RESISTOR (A3P) X2M TERMINAL STRIP F1U, F2U FUSE (T, 3.15A, 250V) (A1P) R95 RESISTOR (CURRENT LIMITING) X3M TERMINAL STRIP (REMOTE SWITCH) F3U, F4U FUSE (T, 1.0A, 250V) R1T THERMSITOR (AIR) (A1P) Y1E ELECTRONIC EXPANSION VALVE (MAIN) F400U FUSE (T, 6.3A, 250V) (A2P) R1T THERMSITOR (FIN) (A3P) Y2E ELECTRONIC EXPANSION VALVE (GAS) H1P~8P PILOTLAMP (SERVICE MONITOR-ORANGE) R2T THERMSITOR (SUCTION) Y3E ELECTRONIC EXPANSION VALVE (M1C) [H2]MALFUNCTION DETECTION---LIGHT UP R31T, R32T THERMSITOR (M1C, M2C DISCHARGE) Y2S SOLEID VALVE (M2C) R3T THERMSITOR (HEAT EXC, DEICER) Y3S SOLEID VALVE (4 WAY VALVE) HAP PILOTLAMP (SERVICE MONITOR-GREEN) R5T THERMSITOR (HEAT EX, OF SUBCOOL OUTLET) Z1C~7C, Z10C ISE FILTER (FERRITE CORE) K1R, K3R MAGNETIC RELAY R6T THERMSITOR (HEAT EX, OF SUBCOOL INLET) Z1F ISE FILTER (WITH SURGE ABSORBER) (A2P) K2M, K4M MAGNETIC CONTACTOR (M1C) RY1 MAGNETIC RELAY (A9P) K2M MAGNETIC CONTACTOR (M2C) S1NPH PRESSURE SENSOR (HIGH) 3D059918C RED WHT BLK L1 L2 L3 N A9P X3A X1A RY1 U V W M 3~ M2C TES) 1. THIS WIRING DIAGRAM IS APPLIED ONLY TO THE OUTDOOR UNIT. 2. : FIELD WIRING. A6P 3. : TERMINAL STRIP : CONNECTOR : TERMINAL : PROTECTIVE EARTH (SCREW) 4. AT THE TIME OF FACTORY SHIPMENT, SETTING OF "OFF". WHEN OPERATING, SETTING OF "ON" OR "REMOTE". THE POINT OF CONTACT OF THE INPUT MUST USE THE ONE FOR A SLIGHT CURRENT. (FOR THE REMOTE SWITCH, USE N-VOLTAGE CONTACT FOR MICROCURRENT (T MORE THAN 1mA DC12V)) 5. BE TED THAT THE CAPACITY OF CONTACT IS AC220~240V, 0.5A. (TOTAL OF CAUTION OUTPUT, WARNING OUTPUT) 6. BE TED THAT THE CAPACITY OF CONTACT IS AC220~240V, 0.5A. (OPERATING OUTPUT) 7. HOW TO USE BS1~5 AND DS1 AND DS2 SWITCH, REFER TO "SERVICE PRECAUTION" LABEL ON EL. COMPO. BOX COVER. 8. WHEN OPERATING, DON'T SHORTCIRCUIT THE PROTECTION DEVICE (S1PH, S2PH). 9. COLORS BLK:BLACK RED:RED BLU:BLUE WHT:WHITE CRN:GREEN. 10. RY1 POINT CONTACT IS OPEN BEFORE TURNING ON POWER SUPPLY. REFER TO TECHNICAL GUIDE FOR THE OPERATION TIMING DIAGRAM. 16 Air Cooled Refrigeration Condensing Unit

18 SiENBE Standard Specification LRLEQ15A, 20AY1(E) LRMEQ15A, 20AY1(E) POWER SUPPLY Y1: V 3N~50Hz GRN C1 Z10C X1M N=4 RED L1 L1 WHT L2 L2 BLK L3 L3 BLU N N RED BLU BLK A1P X1A F1U F2U Q1RP S1PH P< X2A RED GRN WHT BLU BLK A2P X400A K4M Z1F F400U X401A X403A X402A V1CP X3A X4A RED WHT BLK A3P P1 WHT L1R WHT P2 C66 C63 R50 R59 X10A X1A K2M V2R K1R R95 PS X5A N3 P3 X61A X6A X4A Z4C N=1 BLK RED A4P P1 X5A X3A F1U Z2C N=1 P2 N1 N2 R10 X4A X28A X20A V1R X41A X111A X1A Z5C N=1 V1R X2A RED WHT BLK RED WHT BLK K3R K4R K5R K6R K10R K11R T2A N=1 Z6C N=1 Z1C N=1 K3R A9P X1A X3A RY1 TE) 10 X2A X26A S3PH A1 S2PH P< P< X105A K1R R S T K2M U V W X1A T1A A6P X1A T1A A7P R S T K3M U V W BLK RED X51A X25A A8P X5A X3A K2M A2 A1 K3M A2 P1 F1U RED WHT RED WHT N1 R10 X5A K2R X6A X4A Z7C N=5 Z8C N=5 X11A U V W U V W Z3C t 5 M M N=5 R1T 3~ 3~ X1A X2A U V W M2C M3C TES) MS 3~ 1. THIS WIRING DIAGRAM IS APPLIED ONLY MS 3~ TO THE OUTDOOR UNIT. M1C 5 2. : FIELD WIRING. M1F 3. : TERMINAL STRIP : CONNECTOR :TERMINAL :PROTECTIVE EARTH (SCREW) X1A X2A X66A TERMINAL OF M1C~M3C W PS U H1P H2P H3P H4P H5P H6P H7P H8P P< S4PH V X36A LAYOUT OF M1C~M3C, M1F, M2F BS1 BS2 BS3 BS4 BS5 HAP X7A X8A X9A X10A X14A X15A CONTROL, BOX X18A t M2F M1F ON DS1 DS2 R1T ON M1C M2C OFF OFF S1NPL X31A Y2S Y3S M3C F4U Y5S F3U X32A S1NPH C C1 W1 P1 P2 X2M CAUTION OUTPUT TE)5 WARNING OUTPUT TE)5 OPERATING OUTPUT TE)6 IS CONNECTOR COLOR FOR PRINTED CIRCUIT BOARD. IS CONNECTOR COLOR FOR COMPONENT. IS DISCRIMINATION COLOR FOR COMPONENT LEAD WIRE. X22A X21A BLK 5 WHT BLK 5 Y1E M Y2E M X1A A9P OUTER SHELL CONTROL. BOX S1S X2M A1P X2A X4A A5P A5P BLU WHT BLU A6P A7P X1M X1A X23A Y3E X29A X30A K2M K3M 5 X3M X1M M A B C t t t t t t t (FRONT) R31T R32T R33T R2T R3T R5T R6T S1S L1R REMOTE OFF ON A3P 4 1 A4P 3 2 TE)4 X3M SWITCH A2P A8P 1 2 (BACK) A1P PRINTED CIRCUIT BOARD (MAIN) K3R MAGNETIC RELAY (CAUTION OUTPUT) S1PH~3PH PRESSURE SWITCH (HIGH) A2P PRINTED CIRCUIT BOARD (ISE FILTER) K4R MAGNETIC RELAY (Y2S) S4PH PRESSURE SWITCH (HIGH) A3P PRINTED CIRCUIT BOARD (INV) K5R MAGNETIC RELAY (Y3S) S1S OPERATION SWITCH (REMOTE/OFF/ON) A4P, A8P PRINTED CIRCUIT BOARD (FAN) K6R MAGNETIC RELAY (WARNING OUTPUT) T1A CURRENT SENSOR (A6P, A7P) A5P PRINTED CIRCUIT BOARD (ABC I/P) K10R MAGNETIC RELAY (OPERATING OUTPUT) T2A CURRENT SENSOR (A9P) A6P, A7P PRINTED CIRCUIT BOARD (CURRENT SENSOR) K11R MAGNETIC RELAY (Y5S) V1CP SAFETY DEVICES INPUT A9P PRINTED CIRCUIT BOARD (EARTH LEAKAGE DETECTOR) L1R REACTOR (A3P) V1R POWER MODULE (A3P, A4P, A8P) BS1~5 PUSH BUTTON SWITCH M1C~3C MOTOR (COMPRESSOR) V2R DIODE BRIDGE (A3P) (MODE, SET, RETURN, TEST, RESET) M1F, M2F MOTOR (FAN) X1A~4A CONNECTOR (M1F, M2F) C1 CAPACITOR PS SWITCHING POWER SUPPLY (A1P, A3P) X105A CONNECTOR (S3PH) C63, C66 CAPACITOR (A3P) Q1RP PHASE REVERSAL DETECT CIRCUIT X1M TERMINAL STRIP (POWER SUPPLY) DS1, DS2 DIP SWITCH (A1P) R10 RESISTOR (CURRENT SENSOR) (A4P, A8P) X1M TERMINAL STRIP (OPERATION) (A5P) F1U FUSE (8A, DC650V) (A4P, A8P) R50, R59 RESISTOR (A3P) X2M TERMINAL STRIP F1U, F2U FUSE (T, 3.15A, 250V) (A1P) R95 RESISTOR (CURRENT LIMITING) X3M TERMINAL STRIP (REMOTE SWITCH) F3U, F4U FUSE (T, 1.0A, 250V) R1T THERMISTOR (AIR) (A1P) Y1E ELECTRONIC EXPANSION VALVE (MAIN) F400U FUSE (T, 6.3A, 250V) (A2P) R1T THERMISTOR (FIN) (A3P) Y2E ELECTRONIC EXPANSION VALVE (GAS) H1P~8P PILOTLAMP (SERVICE MONITOR-ORANGE) R2T THERMISTOR (SUCTION) Y3E ELECTRONIC EXPANSION VALVE (M1C) [H2P] MALFUNCTION DETECTION---LIGHT UP R31~33T THERMISTOR (M1C~3C DISCHARGE) Y2S SOLEID VALVE (M2C) R3T THERMISTOR (HEAT EXC, DEICER) Y3S SOLEID VALVE (4 WAY VALVE) HAP PILOTLAMP (SERVICE MONITOR-GREEN) R5T THERMISTOR (HEAT EX, OF SUBCOOL OUTLET) Y5S SOLEID VALVE (M3C) K1R,K3R MAGNETIC RELAY R6T THERMISTOR (HEAT EX, OF SUBCOOL INLET) Z1C~10C ISE FILTER (FERRITE CORE) K2M, K4M MAGNETIC CONTACTOR (M1C) RY1 MAGNETIC RELAY (A9P) Z1F ISE FILTER (WITH SURGE ABSORBER) (A2P) K2M, K3M MAGNETIC CONTACTOR (M2C, M3C) S1NPH PRESSURE SENSOR (HIGH) K1R, K2R MAGNETIC RELAY (K2M, K3M) S1NPL PRESSURE SENSOR (LOW) 3D063035B RED WHT BLK 4. AT THE TIME OF FACTORY SHIPMENT, SETTING OF "OFF". WHEN OPERATING, SETTING OF "ON" OR "REMOTE". THE POINT OF CONTACT OF THE INPUT MUST USE THE ONE FOR A SLIGHT CURRENT. (FOR THE REMOTE SWITCH, USE N-VOLTAGE CONTACT FOR MICROCURRENT (T MORE THAN 1mA DC12V)) 5. BE TED THAT THE CAPACITY OF CONTACT IS AC220~240V, 0.5A. (TOTAL OF CAUTION OUTPUT, WARNING OUTPUT) 6. BE TED THAT THE CAPACITY OF CONTACT IS AC220~240V, 0.5A. (OPERATING OUTPUT) 7. HOW TO USE BS1~5, DS1 AND DS2 SWITCH, REFER TO "SERVICE PRECAUTION" LABEL ON EL. COMPO. BOX COVER. 8. WHEN OPERATING, DON'T SHORTCIRCUIT THE PROTECTION DEVICE (S1PH~S3PH). 9. COLORS BLK:BLACK RED:RED BLU:BLUE WHT:WHITE GRN:GREEN. 10. RY1 POINT CONTACT IS OPEN BEFORE TURNING ON POWER SUPPLY. REFER TO TECHNICAL GUIDE FOR THE OPERATION TIMING DIAGRAM. X3A RED WHT BLK Z9C N=1 5 RED RED X3A X4A RED WHT BLK WHT RED MS 3~ M2F V1R 5 WHT Air Cooled Refrigeration Condensing Unit 17

19 Standard Specification SiENBE Piping Diagram LRLEQ5A, 6AY1(E) LRMEQ5A, 6AY1(E) FILTER CHECK VALVE DOUBLE PIPE HEAT EXCHANGER RECEIVER FUSIBLE PLUG CHECK VALVE PRESSURE REGULATING VALVE SERVICE PORT ELECTRONIC EXPANSION VALVE FILTER CHECK VALVE SIGHT GLASS ELECTRONIC EXPANSION VALVE FAN M HEAT EXCHANGER FILTER HPS STOP VALVE HIGH PRESSURE SWITCH (DEFROST) FOUR WAY VALVE CHECK VALVE STOP VALVE SERVICE PORT GAUGE PORT HIGH PRESSURE SENSOR SENPH LIQUID PIPE φ9.5 C1220T LOW PRESSURE SENSOR SENPL GAUGE PORT SERVICE PORT CAPILLARY TUBE FILTER HIGH PRESSURE SWITCH HPS OIL SEPARATOR COMPRESSOR INV GAS PIPE φ19.1 C1220T STOP VALVE (WITH SERVICE PORT φ7.9mm FLARE CONNECTION) 3D064606A 18 Air Cooled Refrigeration Condensing Unit

20 SiENBE Standard Specification LRLEQ8A, 10A, 12AY1(E) LRMEQ8A, 10A, 12AY1(E) FILTER SERVICE PORT CHECK VALVE ELECTRONIC EXPANSION VALVE PLATE TYPE HEAT EXCHANGER FILTER RECEIVER FUSIBLE PLUG CHECK VALVE PRESSURE REGULATING VALVE CHECK VALVE SIGHT GLASS ELECTRONIC EXPANSION VALVE FAN M HEAT EXCHANGER FILTER S4PH STOP VALVE HIGH PRESSURE SWITCH (DEFROST) FOUR WAY VALVE STOP VALVE SERVICE PORT GAUGE PORT HIGH PRESSURE SENSOR S1NPH FILTER CHECK VALVE CHECK VALVE LIQUID PIPE φ9.5 C1220T LOW PRESSURE SENSOR S1NPL GAUGE PORT SERVICE PORT CAPILLARY FILTER TUBE HIGH PRESSURE SWITCH S1PH ELECTRONIC EXPANSION VALVE OIL SEPARATOR COMPRESSOR INV CAPILLARY TUBE CHECK VALVE FILTER HIGH PRESSURE SWITCH S2PH SV SOLEID CHECK VALVE VALVE OIL SEPARATOR COMPRESSOR STD GAS PIPE φ25.4 C1220T STOP VALVE (WITH SERVICE PORT φ7.9mm FLARE CONNECTION) 3D Air Cooled Refrigeration Condensing Unit 19

21 Standard Specification SiENBE LRLEQ15A, 20AY1(E) LRMEQ15A, 20AY1(E) CHECK VALVE FILTER SERVICE PORT CHECK VALVE ELECTRONIC EXPANSION VALVE PLATE TYPE HEAT EXCHANGER SIGHT GLASS FILTER RECEIVER FUSIBLE PLUG CHECK VALVE PRESSURE REGULATING VALVE ELECTRONIC EXPANSION VALVE FAN M HEAT EXCHANGER FILTER S4PH STOP VALVE HIGH PRESSURE SWITCH (DEFROST) FOUR WAY VALVE STOP VALVE SERVICE PORT GAUGE PORT HIGH PRESSURE SENSOR S1NPH FILTER CHECK VALVE CHECK VALVE CHECK VALVE LIQUID PIPE φ12.7 C1220T LOW PRESSURE SENSOR S1NPL GAUGE PORT SERVICE PORT CAPILLARY FILTER TUBE HIGH PRESSURE SWITCH S1PH ELECTRONIC EXPANSION VALVE OIL SEPARATOR COMPRESSOR INV CHECK VALVE CAPILLARY TUBE HIGH PRESSURE SWITCH S2PH SV FILTER SOLEID CHECK VALVE VALVE OIL SEPARATOR COMPRESSOR STD1 CHECK VALVE CAPILLARY TUBE FILTER HIGH PRESSURE SWITCH S3PH SV OIL SEPARATOR COMPRESSOR SOLEID CHECK STD2 VALVE VALVE GAS PIPE φ31.8 C1220T STOP VALVE (WITH SERVICE PORT φ7.9mm FLARE CONNECTION) 3D Air Cooled Refrigeration Condensing Unit

22 SiENBE Standard Specification 2.6 Description and Layout of Functional Parts and Piping Diagram LRMEQ5, 6AY1 LRLEQ5, 6AY1 No. Name Symbol Function 1 Inverter compressor (INV) M1C An inverter-driven compressor, which runs at operating frequencies in the range of 52Hz to 218Hz. 2 Fan motor M1F Used to operate a fan for heat exchange through an air heat exchanger. 3 4 Electronic expansion valve (Main: EV1) Electronic expansion valve (Injection: EV2) Y1E Y2E Not used. 5 Four way valve Y3S Not used. 6 High pressure sensor S1NPH Used to detect high pressure. 7 Low pressure sensor S1NPL Used to detect low pressure. Used to control the injection flow rate and the compressor overheat protection. 8 High pressure switch S1PH In order to prevent the increase of high pressure when a malfunction occurs, this switch activated at high pressure of 3.8MPa or more to stop the compressor operation. 9 High pressure switch S4PH Not used. 10 Fusible plug 11 Pressure regulating valve Double pipe heat exchanger Stop valve (Heat exchanger on primary side) When the refrigerant of the receiver unit reaches a temperature of 70 C to 75 C, the fusible head of plug will melt, thus discharging the refrigerant of high temperature and high pressure. Opens when the pressure reaches 4.0 MPa. This prevents an excessive pressure rise caused by the pipes being completely filled with liquid when not in operation. Used to cool the liquid refrigerant from the liquid receiver. Used to service. 14 Stop valve (Double pipe heat exchanger on Used to service. secondary side) 15 Service port For gas (high pressure). 16 Service port For liquid (high pressure). 17 Service port For gas (low pressure). 18 Oil separator Refrigerant gas discharged from the compressor contains lubricating oil in the compressor. If the amount of this lubricating oil is large, the oil quantity in the compressor will become short, which may result in defective lubrication. Furthermore, this oil stains the heat transfer surface of condenser or evaporator and reduces the effectiveness of the heat exchanger. To avoid that, an oil separator is installed in close proximity to the discharge pipe of the compressor, where oil is separated and collected to return to the compressor. 19 Liquid receiver Used to compensate the variations in handling of refrigerant, thus providing stable operating conditions at all times. In order to repair in the refrigerant circuit, this receiver collects the refrigerant and facilitates the repairing of the parts. 20 Sight glass Used to test run and service. A B C D E F Thermistor (Outdoor air: Ta) Thermistor (Suction pipe: Ti) Thermistor (INV discharge pipe: Td1) Thermistor (Heat exchanger deicer: Tce) Thermistor (Double pipe heat exchanger outlet: Tg) Thermistor (Double pipe heat exchanger inlet: TL) R1T R2T R31T R3T R5T R6T Used to detect the outdoor temperature and control the fan operation. Used to detect the suction pipe temperature of M1C compressor and protect this compressor. Used to detect the discharge pipe temperature of M1C compressor and control over discharge pipe temperature of this compressor for protection. Not used. Used to detect the gas temperature at evaporator side of double pipe heat exchanger, and keep the constant overheated degree of double pipe heat exchanger. Used to detect the gas saturation temperature at evaporator side of double pipe heat exchanger. Air Cooled Refrigeration Condensing Unit 21

23 Standard Specification SiENBE LRMEQ5, 6AY1 LRLEQ5, 6AY1 FILTER CHECK VALVE (16) (E) SERVICE PORT CHECK VALVE (12) DOUBLE PIPE HEAT EXCHANGER (F) ELECTRONIC EXPANSION (4) VALVE SIGHT GLASS(20) (19) FILTER RECEIVER FUSIBLE(10) PLUG CHECK VALVE (D) PRESSURE REGULATING VALVE (11) ELECTRONIC EXPANSION VALVE (3) FAN (2) M HEAT EXCHANGER FILTER FOUR WAY VALVE STOP VALVE (5) (14) HIGH PRESSURE SWITCH (DEFROST) (9) S4PH CHECK VALVE (A) STOP VALVE (13) GAUGE PORT HIGH PRESSURE SENSOR S1NPH (6) LIQUID PIPE φ9.5 C1220T GAS PIPE φ19.1 C1220T LOW PRESSURE SENSOR S1NPL (7) (17) GAUGE PORT SERVICE PORT (B) CAPILLARY TUBE STOP VALVE (WITH SERVICE PORT φ7.9mm FLARE CONNECTION) FILTER HIGH PRESSURE (8) SWITCH S1PH OIL SEPARATOR SERVICE PORT (15) (18) (C) COMPRESSOR INV (1) 22 Air Cooled Refrigeration Condensing Unit

24 SiENBE Standard Specification LRMEQ5, 6AY1 LRLEQ5, 6AY C R31T 2 M1F 17 Y3S S1NPH S1NPL 13 Y2E 4 Y1E 3 S4PH B A F R2T R1T R6T R5T R3T E D 8 S1PH 1 M1C Air Cooled Refrigeration Condensing Unit 23

25 Standard Specification SiENBE LRMEQ8, 10, 12AY1 LRLEQ8, 10, 12AY1 No. Name Symbol Function 1 Inverter compressor (INV) M1C An inverter-driven compressor, which runs at operating frequencies in the range of 52Hz to 232Hz. 2 Standard compressor (STD) M2C A compressor, which runs with commercial power supply. 3 Fan motor M1F Used to operate a fan for heat exchange through an air heat exchanger Electronic expansion valve (Main: EV1) Electronic expansion valve (Injection: EV2) Electronic expansion valve (M1C: EV3) Y1E Y2E Y3E Not used. Used to control the injection flow rate and the compressor overheat protection. Returns the oil to the inverter compressor and creates a gas-injection economizer circuit. In addition, this controls the difference in discharge pipe temperatures between INV compressor and STD compressor. 7 Solenoid valve Y2S Returns the oil to the M2C and creates a gas-injection economizer circuit. 8 Four way valve Y3S Not used. 9 High pressure sensor S1NPH Used to detect high pressure. 10 Low pressure sensor S1NPL Used to detect low pressure High pressure switch (for INV) High pressure switch (for STD) S1PH S2PH 13 High pressure switch S4PH Not used. 14 Fusible plug In order to prevent the increase of high pressure when a malfunction occurs, this switch activated at high pressure of 3.8MPa or more to stop the compressor operation. When the refrigerant of the receiver unit reaches a temperature of 70 C to 75 C, the fusible head of plug will melt, thus discharging the refrigerant of high temperature and high pressure. 15 Pressure regulating valve Opens when the pressure reaches 4.0 MPa. This prevents an excessive pressure rise caused by the pipes being completely filled with liquid when not in operation. 16 Plate type heat exchanger Used to cool the liquid refrigerant from the liquid receiver. 17 Stop valve (Heat exchanger on primary side) Used to service. 18 Stop valve (Double pipe heat exchanger on secondary side) Used to service. 19 Service port For gas (high pressure). 20 Service port For liquid (high pressure). 21 Service port For gas (low pressure). 22 Oil separator Refrigerant gas discharged from the compressor contains lubricating oil in the compressor. If the amount of this lubricating oil is large, the oil quantity in the compressor will become short, which may result in defective lubrication. Furthermore, this oil stains the heat transfer surface of condenser or evaporator and reduces the effectiveness of the heat exchanger. To avoid that, an oil separator is installed in close proximity to the discharge pipe of the compressor, where oil is separated and collected to return to the compressor. 23 Liquid receiver Used to compensate the variations in handling of refrigerant, thus providing stable operating conditions at all times. In order to repair in the refrigerant circuit, this receiver collects the refrigerant and facilitates the repairing of the parts. 24 Sight glass Used to test run and service. A B C D E F G Thermistor (Outdoor air: Ta) Thermistor (Suction pipe: Ti) Thermistor (INV discharge pipe: Td1) Thermistor (STD discharge pipe: Td2) Thermistor (Heat exchanger deicer: Tce) Thermistor (Plate type heat exchanger outlet: Tg) Thermistor (Plate type heat exchanger inlet: TL) R1T R2T R31T R32T R3T R5T R6T Used to detect the outdoor temperature and control the fan operation. Used to detect the suction pipe temperature of M1C and M2C compressor and protect this compressor. Used to detect the discharge pipe temperature of M1C compressor and control over discharge pipe temperature of this compressor for protection. Used to detect the discharge pipe temperature of M2C compressor and control over discharge pipe temperature of this compressor for protection. Not used. Used to detect the gas temperature at evaporator side of double pipe heat exchanger, and keep the constant overheated degree of double pipe heat exchanger. Used to detect the gas saturation temperature at evaporator side of double pipe heat exchanger. 24 Air Cooled Refrigeration Condensing Unit

26 SiENBE Standard Specification LRMEQ8, 10, 12AY1 LRLEQ8, 10, 12AY1 FILTER CHECK VALVE CHECK VALVE (G) ELECTRONIC EXPANSION (5) (20) VALVE SERVICE PORT (F) PLATE TYPE HEAT (16) EXCHANGER SIGHT GLASS(24) ELECTRONIC EXPANSION (4) VALVE FILTER (23) RECEIVER (14) FUSIBLE PLUG CHECK VALVE (3) FAN M (17) (E) (15) PRESSURE REGULATING VALVE HEAT EXCHANGER (A) FILTER FOUR WAY VALVE STOP VALVE (8) (18) HIGH PRESSURE SWITCH (DEFROST) (13) S4PH STOP VALVE SERVICE PORT(19) GAUGE PORT HIGH PRESSURE SENSOR S1NPH (9) FILTER CHECK VALVE CHECK VALVE LIQUID PIPE φ9.5 C1220T GAS PIPE φ25.4 C1220T LOW PRESSURE SENSOR S1NPL (10) (21) GAUGE PORT SERVICE PORT CAPILLARY FILTER TUBE OIL SEPARATOR (22) HIGH PRESSURE (11) SWITCH S1PH (C) COMPRESSOR ELECTRONIC INV EXPANSION (1) VALVE (6) (B) STOP VALVE (WITH SERVICE PORT φ7.9mm FLARE CONNECTION) CHECK VALVE FILTER (22) CAPILLARY TUBE HIGH PRESSURE (12) SWITCH S2PH SV (D) COMPRESSOR SOLEID CHECK STD VALVE VALVE (2) (7) OIL SEPARATOR Air Cooled Refrigeration Condensing Unit 25

27 Standard Specification SiENBE LRMEQ8, 10, 12AY1 LRLEQ8, 10, 12AY1 Y3E Y2S D C R32T R31T 3 M1F 9 S1NPH S4PH R6T R3T R5T Y3S 8 Y1E 4 Y2E G E F S1NPL B R2T 11 S1PH 12 S2PH A R1T 1 M1C 2 M2C 26 Air Cooled Refrigeration Condensing Unit

28 SiENBE Standard Specification LRMEQ15, 20AY1 LRLEQ15, 20AY1 No. Name Symbol Function 1 Inverter compressor (INV) M1C An inverter-driven compressor, which runs at operating frequencies in the range of 52Hz to 232Hz. 2 Standard compressor (STD 1) M2C 3 Standard compressor (STD 2) M3C A compressor, which runs with commercial power supply. 4 Fan motor M1F Used to operate a fan on the right for heat exchange through an air heat exchanger. 5 Fan motor M2F Used to operate a fan on the left for heat exchange through an air heat exchanger. 6 Electronic expansion valve (Main: EV1) Y1E Not used. 7 Electronic expansion valve (Injection: EV2) Y2E Used to control the injection flow rate and the compressor overheat protection. 8 Electronic expansion valve (M1C: EV3) Y3E Returns the oil to the inverter compressor and creates a gas-injection economizer circuit. In addition, this controls the difference in discharge pipe temperatures between INV compressor and STD compressor. 9 Solenoid valve Y2S Returns the oil to the M2C and creates a gas-injection economizer circuit. 10 Four way valve Y3S Not used. 11 Solenoid valve Y5S Returns the oil to the M3C and creates a gas-injection economizer circuit. 12 High pressure sensor S1NPH Used to detect high pressure. 13 Low pressure sensor S1NPL Used to detect low pressure. 14 High pressure switch (for INV) S1PH In order to prevent the increase of high pressure when a malfunction 15 High pressure switch (for STD 1) S2PH 16 High pressure switch (for STD 2) S3PH 17 High pressure switch S4PH Not used. occurs, this switch activated at high pressure of 3.8MPa or more to stop the compressor operation. 18 Fusible plug When the refrigerant of the receiver unit reaches a temperature of 70 C to 75 C, the fusible head of plug will melt, thus discharging the refrigerant of high temperature and high pressure. 19 Pressure regulating valve Opens when the pressure reaches 4.0 MPa. This prevents an excessive pressure rise caused by the pipes being completely filled with liquid when not in operation. 20 Plate type heat exchanger Used to cool the liquid refrigerant from the liquid receiver. 21 Stop valve (Heat exchanger on primary side) Used to service. 22 Stop valve (Double pipe heat exchanger on secondary side) Used to service. 23 Service port For gas (high pressure). 24 Service port For liquid (high pressure). 25 Service port For gas (low pressure). 26 Oil separator Refrigerant gas discharged from the compressor contains lubricating oil in the compressor. If the amount of this lubricating oil is large, the oil quantity in the compressor will become short, which may result in defective lubrication. Furthermore, this oil stains the heat transfer surface of condenser or evaporator and reduces the effectiveness of the heat exchanger. To avoid that, an oil separator is installed in close proximity to the discharge pipe of the compressor, where oil is separated and collected to return to the compressor. 27 Liquid receiver Used to compensate the variations in handling of refrigerant, thus providing stable operating conditions at all times. In order to repair in the refrigerant circuit, this receiver collects the refrigerant and facilitates the repairing of the parts. 28 Sight glass Used to test run and service. A Thermistor (Outdoor air: Ta) R1T Used to detect the outdoor temperature and control the fan operation. B Thermistor (Suction pipe: Ti) R2T Used to detect the suction pipe temperature of M1C~M3C compressor and protect this compressor. C Thermistor (INV discharge pipe: Td1) R31T Used to detect the discharge pipe temperature of M1C compressor and control over discharge pipe temperature of this compressor for protection. D Thermistor (STD 1 discharge pipe: Td2) R32T Used to detect the discharge pipe temperature of M2C compressor and control over discharge pipe temperature of this compressor for protection. E Thermistor (STD 2 discharge pipe: Td3) R33T Used to detect the discharge pipe temperature of M3C compressor and control over discharge pipe temperature of this compressor for protection. F Thermistor (Heat exchanger deicer: Tce) R3T Not used. G Thermistor (Plate type heat Used to detect the gas temperature at evaporator side of double pipe heat exchanger, exchanger outlet: Tg) R5T and keep the constant overheated degree of double pipe heat exchanger. H Thermistor (Plate type heat exchanger inlet: TL) R6T Used to detect the gas saturation temperature at evaporator side of double pipe heat exchanger. Air Cooled Refrigeration Condensing Unit 27

29 Standard Specification SiENBE LRMEQ15, 20AY1 LRLEQ15, 20AY1 FILTER CHECK VALVE CHECK VALVE (H) ELECTRONIC EXPANSION (7) (24) VALVE SERVICE PORT (G) PLATE TYPE HEAT EXCHANGER (20) SIGHT GLASS(28) FILTER FUSIBLE PLUG CHECK VALVE (27) (18) RECEIVER (F) PRESSURE REGULATING VALVE (19) FILTER ELECTRONIC EXPANSION VALVE (6) FOUR WAY VALVE STOP VALVE (10) (22) HIGH PRESSURE SWITCH (DEFROST) (17) S4PH FAN (4) M (5) (21) STOP VALVE SERVICE PORT (23) GAUGE PORT HIGH PRESSURE SENSOR S1NPH HEAT EXCHANGER (A) (12) FILTER CHECK VALVE CHECK VALVE CHECK VALVE LIQUID PIPE φ12.7 C1220T GAS PIPE φ31.8 C1220T LOW PRESSURE SENSOR S1NPL (13) (25) GAUGE PORT SERVICE PORT CAPILLARY TUBE FILTER OIL SEPARATOR STOP VALVE (WITH SERVICE PORT φ7.9mm FLARE CONNECTION) CHECK VALVE FILTER OIL SEPARATOR CHECK VALVE FILTER OIL SEPARATOR CAPILLARY CAPILLARY HIGH PRESSURE TUBE HIGH PRESSURE TUBE (14) HIGH PRESSURE SWITCH S1PH (15) SWITCH S2PH (16) SWITCH S3PH (C) SV (D) SV (E) COMPRESSOR COMPRESSOR COMPRESSOR ELECTRONIC EXPANSION INV SOLEID CHECK STD1 SOLEID CHECK (1) STD2 (8) VALVE VALVE (2) VALVE VALVE (3) VALVE (9) (11) (B) (26) (26) (26) 28 Air Cooled Refrigeration Condensing Unit

30 SiENBE Standard Specification LRMEQ15, 20AY1 LRLEQ15, 20AY Y3E Y2S Y5S E R33T S1PH 14 D R32T C R31T Y3S S4PH Y2E 7 19 Y1E R3T F 4 13 S1NPL 12 S1NPH B R2T 16 S3PH 15 S2PH A R1T 1 M1C 2 M2C R6T H R5T G 3 M3C Air Cooled Refrigeration Condensing Unit 29

31 Field Settings SiENBE Field Settings 3.1 Field Setting From Outdoor Unit The target evaporation temperature can be calculated as follows: Tst : Target evaporation temperature Tsd : Evaporation temperature set by dip switches ΔTsp: Temperature correction setting by pushbuttons. ΔTsn: Temperature correction setting during night-time operation Tst = Tsd + ΔTsp + ΔTsn The evaporation temperature can be set by dip switches and pushbuttons on the outdoor unit PCB. The dip switches can be set when the power is turned off, while the pushbuttons can be set while the condensing unit is operating. Note that the actual evaporation temperature may be lower than that specified, if the outdoor temperature is too low. (This is intended to protect the compressors.) Do not set the evaporation temperature to less than the values below. (This may damage the compressors.) MT series : -20 C LT series : -45 C (1) Field settings by dip switches Be sure to turn off the power before changing the DIP switch settings. DS1-1 to 3 enable setting the saturated temperature equivalent to suction pressure (in increments of 5 C). Do not change the settings of DS1-4, DS2-1 to 4. Switch box Location of soft switches Location of dip switches DS1 DS2 ON Main PCB OFF Dip switches 1 to 3 The evaporation temperature setting (specified using the dip switches) can be changed using the pushbuttons, within the range of -4K to +4K, in steps of about 1K. Refer the setting method on next page. 30 Air Cooled Refrigeration Condensing Unit

32 SiENBE Field Settings DS1 Tsd Tsd DS1 LRMEQ** LRLEQ** LRMEQ** LRLEQ** ON OFF Factory set -10 C (0.47MPa) -35 C (0.11MPa) ON OFF C (0.69MPa) -25 C (0.22MPa) ON OFF C (0.29MPa) -45 C (0.03MPa) ON OFF C (0.82MPa) -20 C (0.29MPa) ON OFF C (0.37MPa) -40 C (0.07MPa) ON OFF C (0.98MPa) ON OFF C (0.56MPa) -30 C (0.16MPa) Tsd: The evaporation temperature set by the dip switches. Air Cooled Refrigeration Condensing Unit 31

33 Field Settings SiENBE Setting at replacement by spare PCB Caution DIP switch setting after changing the main PCB to spare parts PCB In case of repair using this part, replace the part according to the following instruction. Make the following capacity and refrigeration / freezing settings subject to application models. Cut the power supply of the outdoor unit once and switch it on again after setting the switch of subject. Freezer: LRLEQ5~20AY1 (E) LED EB**** DS1DS2 Factory Set ( the position of a switch) ON OFF DS1 DS2 Applicable model LRLEQ5AY1 (E) LRLEQ6AY1 (E) LRLEQ8AY1 (E) LRLEQ10AY1 (E) Setting method ( the position of switches) ON OFF ON OFF ON OFF ON Set DS2-2 and DS2-4 to ON Set DS2-1 and DS2-4 to ON Set DS2-1, DS2-2 and DS2-4 to ON Set DS1-4 and DS2-4 to ON LRLEQ12AY1 (E) LRLEQ15AY1 (E) LRLEQ20AY1 (E) OFF ON OFF ON OFF ON OFF Set DS1-4, DS2-2 and DS2-4 to ON Set DS1-4, DS2-1 and DS2-4 to ON Set DS1-4, DS2-1, DS2-2 and DS2-4 to ON 32 Air Cooled Refrigeration Condensing Unit

34 SiENBE Field Settings Refrigerator: LRMEQ5~20AY1 (E) LED EB**** DS1DS2 Factory Set ( the position of a switch) ON OFF DS1 DS2 Applicable model LRMEQ5AY1 (E) Setting method ( the position of switches) ON Set DS2-2 to ON OFF LRMEQ6AY1 (E) ON Set DS2-1 to ON OFF LRMEQ8AY1 (E) ON OFF Set DS2-1 and DS2-2 to ON LRMEQ10AY1 (E) ON Set DS1-4 to ON OFF LRMEQ12AY1 (E) ON OFF Set DS1-4 and DS2-2 to ON LRMEQ15AY1 (E) ON OFF Set DS1-4 and DS2-1 to ON LRMEQ20AY1 (E) ON OFF Set DS1-4, DS2-1 and DS2-2 to ON Air Cooled Refrigeration Condensing Unit 33

35 Field Settings SiENBE (2) Setting in service mode Using pushbuttons on the Main PCB (A1P) enables a variety of settings shown below. The following 4 modes are available. a. Setting mode 1... (H1P: OFF) b. Setting mode 2 Setting mode 3... (H1P: ON) Initial state (while in normal operation): Used to make setting of the method of "Cool/Heat selection". This mode is displayed while in "malfunction", "low noise control", and "demand control" as well. Used to make changes of operating conditions or settings of a variety of addresses, mainly for service work. c. Monitor mode... Used to check the contents set in Setting mode 2. (H1P: BLINK) Procedure for changing mode While in each mode, use the MODE button to change settings as shown below. Setting mode 2 MODE ON H1P BS1 MODE BS2 SET Press and hold the BS1 (MODE) for a period of five seconds. Press the BS1 (MODE) once. BS3 RETURN BS4 Setting mode 3 Setting mode 1 MODE OFF H1P BS5 RESET Simultaneously press and hold the BS1 (MODE) and BS3 (RETURN) for a period of 5 seconds. (Normal) Press the BS1 (MODE) once. Monitor mode MODE BLINK H1P Steps to change mode Caution Turn off the RUN switch of the outdoor unit in case of the setting. Press and hold the BS1 (MODE) for a period of five seconds. Setting mode 1 (Initial state) OP :Select mode with the use of BS2 (SET) in each selection step. Press the BS1 (MODE) once. Setting mode 2 Monitor mode Selection of SET setting items Press the BS3 (RETURN). Selection of setting contents SET Press the BS3 (RETURN). Display of setting contents Press the BS3 (RETURN). Press the BS1 (MODE). Selection of SET check items Press the BS3 (RETURN). Display of contents Press the BS3 (RETURN). Press the BS1 (MODE). 34 Air Cooled Refrigeration Condensing Unit

36 SiENBE Field Settings LED display when power is on H2P blinks for the first five seconds when the power supply is turned on. If the equipment is normal, H2P will be turned off in five seconds. H2P lights for abnormality. k: ON h: OFF l: BLINK No. H1P H2P H3P H4P H5P H6P H7P (Immediately after power on) 1 h l k h h h h No. H1P H2P H3P H4P H5P H6P H7P (5 seconds after power on) 1 h h k h h h h Air Cooled Refrigeration Condensing Unit 35

37 Field Settings SiENBE b-1. Setting mode 2 No. Setting item Display of setting items H1P H2P H3P H4P H5P H6P H7P Display of setting conditions 0 ΔTsp: Fine-tuning setting of evaporation temperature k h h h h h h ΔTsp H1P H2P H3P H4P H5P H6P H7P 0K (Factory set) k h h h h h h -1 C k h h h h h k -2 C k h h h h k h -3 C k h h h h k k -4 C k h h h k h h -5 C k h h h k h k +1 C k h h h k k h +2 C k h h h k k k +3 C k h h k h h h +4 C k h h k h h k +5 C k h h k h k h 2 Current limitation setting k h h h h k h LRM(L)EQ H1P H2P H3P H4P H5P H6P H7P 5,6AY1 8,10,12AY1 15,20AY1 No limitation. (Factory set) k h h h h h k 10A 20A 36A k h h h h k h 9A 18A 30A k h h h k h h 7A 14A 27A k h h k h h h 3 Setting of limit value of outdoor fan taps k h h h h k k H1P H2P H3P H4P H5P H6P H7P (Factory set) k h h h h h k Setting 1 k h h h h k h Setting 2 k h h h k h h Setting 3 k h h k h h h Setting 4 k h k h h h h Setting 5 k k h h h h h Details depend on the following.(*1) 5 Setting of external low noise operation (Tax1, 2 and Tay1, 2 are set by setting ) k h h h k h k 6 (Tamb Tax1) 7(Tay1<Tamb Tax2) 9(Tamb<Tay2) (Factory set) 5(Tamb Tax1) 6(Tay1<Tamb Tax2) 9(Tamb<Tay2) H1P H2P H3P H4P H5P H6P H7P k h h h h h k k h h h h k h 6 AIRNET address k h h h k k h H1P H2P H3P H4P H5P H6P H7P Please give the (Factory set) 0 k h h h h h h address of 1 or 1 k h h h h k k more when you do the AIRNET. ~ Binary system for 63 k h k k k k k address(six digits) 7 Setting of night-time low noise operation (Only connected to AIRNET) k h h h k k k Standard setting High static pressure setting H1P H2P H3P H4P H5P H6P H7P 9 9 k h h h h h k 8 7 k h h h h k h 7 8 k h h h k h h 6 6 k h h k h h h 5 5 k h k h h h h 4 4 k k h h h h h 8 Night-time low noise start setting. It uses it for setting 2-7 and (Only connected to AIRNET) k h h k h h h H1P H2P H3P H4P H5P H6P H7P 21:00 (Factory set) k h h h h h k 22:00 k h h h h k h 23:00 k h h h k h h 20:00 k h h k h h h 9 Night-time low noise end setting. It uses it for setting 2-7 and (Only connected to AIRNET) k h h k h h k H1P H2P H3P H4P H5P H6P H7P 7:00 (Factory set) k h h h h h k 8:00 k h h h h k h 9:00 k h h h k h h 6:00 k h h k h h h 11 ΔTsn: Evaporation temperature correction setting during operation at night-time k h h k h k k H1P H2P H3P H4P H5P H6P H7P +1 C(Factory set) k h h h h h k +2 C k h h h h k h +3 C k h h h k h h 0 C k h h k h h h As for Factory set, time zone between 2-8 and 2-9 becomes effective for setting. 21 Setting of external temperature of outdoor fan tap It uses it by setting 2-5. k h h k k h k Tax1 Tay1 Tax2 Tay2 H1P H2P H3P H4P H5P H6P H7P 26 C 28 C 31 C 33 C k h h h h h k 20 C 22 C 26 C 28 C k h h h h k h 27 C 29 C 32 C 34 C k h h h k h h 40 Setting of high static pressure of outdoor fan k h k h h h k Standard setting (Factory set) High static pressure setting The number in the No. column represent the number of times to press the SET (BS2) button. (*1) Standard setting High static pressure setting Model name LRM(L)EQ6,12,20AY1 LRM(L)EQ5,8,10,15,20AY1 LRM(L)EQ6,12,15,20AY1 LRM(L)EQ5,8,10AY1 Factory set Setting Setting Setting Setting Setting H1P H2P H3P H4P H5P H6P H7P k h h h h h k k h h h h k h 36 Air Cooled Refrigeration Condensing Unit

38 SiENBE Field Settings b-2. Setting mode 2 (for service) Display of setting items No. Setting item H1P H2P H3P H4P H5P H6P H7P Display of setting conditions 4 INV compressor max. frequency step control k h h h k h h Compressor step control 5A 6A 8A 10A 12A 15A 20A H1P H2P H3P H4P H5P H6P H7P k h h h h h h k h h h h h k k h h h h k h k h h h h k k k h h h k h h k h h h k h k k h h h k k h (Factory set) 10 Setting of night-time compressor frequency reduction Set the start time with 2-8, set the end time with 2-9. k h h k h k h 5A 6A 8A 10A 12A 15A 20A H1P H2P H3P H4P H5P H6P H7P Compressor steps (Factory set) k h h h h h h Setting step: 1 Setting step: 2 k h h h h h k Setting step: 2 Setting step: 4 k h h h h k h Setting step: 3 Setting step: 6 k h h h h k k Setting step: 4 Setting step: 8 k h h h k h h Setting step: 5 Setting step: 10 k h h h k h k Setting step: 6 Setting step: 12 k h h h k k h Correction of fan revolution according to the high pressure k h h k k k h Oil recovery continuous operation time k h k h h k k Speed change for cooling capacity reduction k h k h k h h H1P H2P H3P H4P H5P H6P H7P High pressure correction = 0 (Factory set) k h h h h h k High pressure correction = -0.2 k h h h h k h High pressure correction = 0.2 k h h h k h h High pressure correction = 0.4 k h h k h h h High pressure correction = 0.6 k h k h h h h H1P H2P H3P H4P H5P H6P H7P 40 min. (Factory set) k h h h h h k 30 min. k h h h h k h 20 min. k h h h k h h H1PH2PH3PH4PH5PH6PH7P 30 sec. (Factory set) k h h h h h k 10 sec. k h h h h k h 27 INV compressor forced stop k h k k h k k 43 STD1 compressor forced stop k k h k h k k H1P H2P H3P H4P H5P H6P H7P Normal control (Factory set) k h h h h h k Inverter compressor forced stop k h h h h k h To reset the compressor after a forced stop, turn the power off and back on again. H1PH2PH3PH4PH5PH6PH7P Normal control (Factory set) k h h h h h k STD1 compressor forced stop k h h h h k h To reset the compressor after a forced stop, turn the power off and back on again. 44 STD2 compressor forced stop k k h k k h h c. Setting mode 3 (for servicing) No. Setting item Display of setting items H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P Normal control (Factory set) k h h h h h k STD2 compressor forced stop k h h h h k h To reset the compressor after a forced stop, turn the power off and back on again. Display of setting conditions 3-21 Changing the compressor steps during target oil recovery k k h k k h h c. Setting mode 3 (for servicing) Check when malfunction code PJ is displayed. Display of setting items No. Setting item H1P H2P H3P H4P H5P H6P H7P 3-10 Capacity setting k h h k h k h 3-26 Setting the freezing and refrigeration k h k k h k h 3-39 Power supply voltage setting k k h h k k k Compressor frequency 5A, 6A 8A, 10A, 12A 15A, 20A H1P H2P H3P H4P H5P H6P H7P k h h h h h k Factory set k h h h h k h Display of setting conditions H1P H2P H3P H4P H5P H6P H7P LRM(L)EQ5AY1 k h h h h h k LRM(L)EQ6AY1 k h h h h k h LRM(L)EQ8AY1 k h h h h k k LRM(L)EQ10AY1 k h h h k h h LRM(L)EQ12AY1 k h h h k h k LRM(L)EQ15AY1 k h h h k k k LRM(L)EQ20AY1 k h h k h h h H1P H2P H3P H4P H5P H6P H7P Effective setting of Dip switches k h h h h h k Freezing k h h h h k h Refrigeration k h h h k h h H1P H2P H3P H4P H5P H6P H7P 200V k h h h h h k 400V k h h h h k h Air Cooled Refrigeration Condensing Unit 37

39 Field Settings SiENBE d. Setting method with the AIRNET or type-iii checker. 1) In case of the AIRNET Use Setting Mode 2-6 (AIRNET address). Use Setting Mode 2-16 (virtual indoor unit address). 2) In case of a Type-III checker Use Setting Mode 2-16 (virtual indoor unit address). No. Setting item Display of setting items H1P H2P H3P H4P H5P H6P H7P Display of setting conditions 6 AIRNET address k h h h k k h H1P H2P H3P H4P H5P H6P H7P Please give the (Factory set) 0 k h h h h h h 1 k h h h h h k ~ 63 k k k k k k k address of 1 or more to when you do the AIRNET. Uses binary numbers for the address (six digits). H1P H2P H3P H4P H5P H6P H7P (Factory set) 0 k h h h h h h 1 k h h h h h k ~ 63 k k k k k k k 16 Virtual indoor unit address setting k h k h h h h When there is 1 outdoor unit, set the address to "1". When there are multiple outdoor units (outdoor-outdoor transmission connection), contact the After Sales Service Division. 38 Air Cooled Refrigeration Condensing Unit

40 SiENBE Field Settings Evaporation temperature correction at night-time, using an external contact The two methods can be used to increase the evaporation temperature at night-time below: 1. Receiving the time setting from the AIRNET (Setting Mode 2-8 9). 2. Using an external contact. The following describes the wiring needed to use an external contact. By a short-circuit between terminals A and C on the PCB (A5P) in the control box, the evaporation temperature can be corrected at night-time. For details about the wiring, refer to Figure 1. Protect the terminals using insulation sleeves or equivalent. A5P A B C Electric wire thickness mm 2 Wiring length Max. 100 m Contact rating Minimum applied load 12 VDC, 1 ma or less 1 2 X3M <Figure 1> Contact for an evaporation temperature correction at night-time: Contact ON: Enabled. Contact OFF: Disabled. When used in conjunction with a remote switch, connect the wire to the terminal using a ring connector (refer to Figure 2), or connect it to terminal C (refer to Figure 3). The terminal connectors must be protected with insulation sleeves. A5P A5P A B C A B C 1 2 X3M 1 2 X3M To remote switch To remote switch Closed-end connector <Figure 2> <Figure 3> By using the Setting Mode 2-8 9, you can change the amount of evaporation temperature shift that is allowed during the night-time evaporation temperature correction. The shift amount is factory set to 1 C. Moreover, the signal from the external contact will take precedence over the setting specified in Setting Mode Air Cooled Refrigeration Condensing Unit 39

41 Description of Functions and Operation SiENBE Description of Functions and Operation 4.1 Operating Mode [Classification of operating modes] The table below lists all the operating modes available. <List of operating modes> Compressor Cooling operation (Operating Mode) (1 compressor) (2 compressors) (3 compressors) INV 1 k k k INV+STD1 2 k k INV+STD1+STD2 3 k INV+STD2 4 k STD1 5 k k STD1+STD2 6 k STD2 7 k 1 There are 8 operating modes available. (This includes a mode in which the system is stopped.) 2 Operating modes 5, 6 and 7 are INV compressor abnormal operation modes. If operating mode is 4 or 7, the STD1 compressor may be defective. If operating mode is 1, 2 or 5, the STD2 compressor may be defective. 3 The state in which all the compressors are stopped is operating mode Air Cooled Refrigeration Condensing Unit

42 SiENBE Description of Functions and Operation 1) Operation Mode 1 <In case of 1 compressor> HPSL Ti Ta HPS1 HP Td1 INV LP Tg Tce EV2 TL EV1 <In case of 2 compressors> HPSL Ti Ta HP LP HPS1 HPS2 Td1 Td2 EV3 INV SV2 STD1 Tce Tg TL EV2 EV1 Air Cooled Refrigeration Condensing Unit 41

43 Description of Functions and Operation SiENBE <In case of 3 compressors> HPSL Ti Ta HP HPS1 HPS2 HPS3 Td1 EV3 INV SV2 Td2 STD1 SV3 Td3 STD2 Tce Tg TL EV2 EV1 42 Air Cooled Refrigeration Condensing Unit

44 SiENBE Description of Functions and Operation 2) Operation Mode 2 <In case of 2 compressors> HPSL Ti Ta HP LP HPS1 HPS2 Td1 Td2 EV3 INV SV2 STD1 Tce Tg TL EV2 EV1 <In case of 3 compressors> HPSL Ti Ta HP HPS1 HPS2 HPS3 Td1 EV3 INV SV2 Td2 STD1 SV3 Td3 STD2 Tce Tg TL EV2 EV1 Air Cooled Refrigeration Condensing Unit 43

45 Description of Functions and Operation SiENBE ) Operation Mode 3 <In case of 3 compressors> HPSL Ti Ta HP HPS1 HPS2 HPS3 Td1 EV3 INV SV2 Td2 STD1 SV3 Td3 STD2 Tce Tg TL EV2 EV1 4) Operation Mode 4 <In case of 3 compressors> HPSL Ti Ta HP HPS1 HPS2 HPS3 Td1 EV3 INV SV2 Td2 STD1 SV3 Td3 STD2 Tce Tg TL EV2 EV1 44 Air Cooled Refrigeration Condensing Unit

46 SiENBE Description of Functions and Operation 5) Operation Mode 5 (Defective of INV) <In case of 2 compressors> HPSL Ti Ta HP LP HPS1 HPS2 Td1 Td2 EV3 INV SV2 STD1 Tce Tg TL EV2 EV1 <In case of 3 compressors> HPSL Ti Ta HP HPS1 HPS2 HPS3 Td1 EV3 INV SV2 Td2 STD1 SV3 Td3 STD2 Tce Tg TL EV2 EV1 Air Cooled Refrigeration Condensing Unit 45

47 Description of Functions and Operation SiENBE ) Operation Mode 6 (Defective of INV) <In case of 3 compressors> Ti Ta HPSL HP HPS1 HPS2 HPS3 Td1 EV3 INV SV2 Td2 STD1 SV3 Td3 STD2 Tce Tg TL EV2 EV1 7) Operation Mode 7 (Defective of INV) <In case of 3 compressors> HPSL Ti Ta HP HPS1 HPS2 HPS3 Td1 EV3 INV SV2 Td2 STD1 SV3 Td3 STD2 Tce Tg TL EV2 EV1 46 Air Cooled Refrigeration Condensing Unit

48 SiENBE Description of Functions and Operation 4.2 Outline of Functions (Input) Outdoor unit (Output) Low pressure sensor Startup control Compressor High pressure sensor Discharge pipe thermistor Suction pipe thermistor Brazed-plate type heat exchanger inlet thermistor Brazed-plate type heat exchanger outlet thermistor Outdoor heat exchanger outlet thermistor Thermostat ON/OFF Compressor control Outdoor fan control Electronic expansion valve control Solenoid valve control Oil return control Electronic expansion valve Solenoid valve Outdoor fan motor Four way valve Outdoor air thermistor Four way valve control High pressure switch High pressure protection control Protection device Low pressure protection control Overheat protection control STD compressor overcurrent protection control Earth leakage detection control Air Cooled Refrigeration Condensing Unit 47

49 Description of Functions and Operation SiENBE Detailed Description of Functions (1) Startup control The actuators will be operated in the following sequence when the thermostat is turned on: 1 The outdoor fan will start to operate for 5 seconds. (This is intended to measure the outdoor temperature accurately.) 2 At power-up, the operation outputs (P1, P2) for low pressure conditions (see the chart on the right) will be turned on/off. (This is intended to avoid possible liquid compression that is caused by the thermostatic expansion valve in the showcase being fully open during startup. To prevent liquid compression, the liquid solenoid valve will be cycled on and off until the thermostatic expansion valve catches up.) 3 The compressors will be activated Fan Operation prior to compressor activation Air flow rate corresponding to the outdoor temperature. Inverter compressor Activation complete 56Hz 52Hz 15sec 15sec Operation output 90sec This may be turned on in order to raise LP, depending on outdoor temperature and the thermostat OFF time. LP>0.49MPa: Operation output OFF LP<0.294MPa:Operation output ON (2) Thermostat ON/OFF LP>Lpm1+0.15MPa Outdoor temperature Ta < Tsd & or & (the evaporation temperature set by the dip switches) 3 minutes after the thermostat is turned OFF. LP>Lpm1 & 3 minutes after the thermostat is turned OFF. The compressor standby mode before a restart is complete. Thermostat OFF (Compressor stops.) & Activation complete. or Thermostat ON (Compressor starts.) LP < Thermostat off setting value LP < 0 MPa continuously for 5 seconds Thermostat off setting value MT LRMEQ** 0.1MPa LT LRLEQ*** MPa Lpm: Lpm1 obtained after an outdoor temperature correction is made. Lpm1: Pressure equivalent to the evaporation temperature set by the dip switches (Tsd: Evaporation temperature set by the dip switches). LP: The pressure detected by the low pressure sensor (S1NPL) 48 Air Cooled Refrigeration Condensing Unit

50 SiENBE Description of Functions and Operation Conversion table for using the evaporation temperature (set by the dip switches) to determine its pressure equivalent DS1 Tsd(Lpm1) Tsd(Lpm1) DS1 LRMEQ** LRLEQ** LRMEQ** LRLEQ** ON OFF Factory set -10 C (0.47MPa) -35 C (0.11MPa) ON OFF C (0.69MPa) -25 C (0.22MPa) ON OFF C (0.29MPa) -45 C (0.03MPa) ON OFF C (0.82MPa) -20 C (0.29MPa) ON OFF C (0.37MPa) -40 C (0.07MPa) ON OFF C (0.98MPa) ON OFF C (0.56MPa) -30 C (0.16MPa) Air Cooled Refrigeration Condensing Unit 49

51 Description of Functions and Operation SiENBE (3) Compressor control Compressor control Normal capacity control High compression ratio avoidance control Differential pressure inversion avoidance control Oil return control by increasing the compressor frequency Increase or decrease the compressor frequency using the low pressure as a controlled variable, in order to achieve the optimum cooling capacity for the target evaporation temperature (Tst). The target evaporation temperature value used will be the one set by the dip switches. (For details, see section 2, "Field Settings"). The frequency value will be increased or decreased in steps of 1 every 30 seconds. If the low pressure (LP) drops below a pressure equivalent to the target evaporation temperature (Lpm) MPa, the compressor speed will be reduced by one step (every 30 seconds). If the low pressure (LP) exceeds a pressure equivalent to the target evaporation temperature (Lpm) MPa, the compressor speed will be increased by one step (every 30 seconds). However, the thermostat ON/OFF operation will be performed if the load is low. If the compression ratio stays above 25 for 10 seconds or more, the compressor speed will be reduced. (This is intended to protect the compressor scrolls.) If the high and low pressure differential is too small, the compressor speed will be increased according to the actual differential pressure. (This is intended to maintain lubrication.) See the "Oil return control" section. Control using a reduced LP Reduces the number of compressors being operated or the compressor speed, according to the actual low pressure and the speed at which the pressure is reduced. When stopping the STD compressor: & Operation mode is not 1, 5 or 7. Low pressure (LP) < Rapidly dropping LP When reducing the INV compressor speed: & Operation mode = 1 Low pressure (LP) < LP required for shifting to minimum Hz Values for rapidly dropping LP and the LP required for shifting to minimum Hz LRMEQ** LRLEQ** Rapidly dropping LP 0.23MPa 0.02MPa LP required for shifting to minimum Hz 0.20MPa 0.02MPa Droop control using HP Droop control using Td The compressor speed is lowered slightly according to the actual high pressure. High pressure (HP) > 3.23 MPa Reduces the compressor speed using the actual discharge thermistor temperature. The discharge pipe temperature (Td) 115 C for 1 minute or more. Droop control using electrical current & INV Current limit control Droop control using INV compressor current Control will be performed according to the electrical current setting specified in Setting Mode 2-2, as the upper limit. Note that this setting will reduce the cooling capacity. (For details about setting procedures, see the "Setting Mode 2-2" section) Reduces the compressor speed using the inverter actual secondary current. Inverter secondary current setting for activating droop control: 14.7 A Droop control using INV compressor fin temperature Reduces the compressor speed according to the actual inverter fin temperature. Inverter fin temperature setting for activating droop control: 84 C STD compressor overcurrent protection control If any of the following conditions is met, the INV. compressor speed will be reduced. or The STD electrical current value>12.5 A and HP 3.28 MPa for 2 seconds. The STD electrical current value>12 A and HP 3.28 MPa for 5 seconds. If any of the following conditions is met, the STD compressor will be stopped. The STD current value>14.95 A for 2.1 seconds. The STD current value>13 A for 5 seconds. The STD current value>12.35 A for 20 seconds. 50 Air Cooled Refrigeration Condensing Unit

52 SiENBE Description of Functions and Operation (3)-1. Compressor steps table INV step General step INV compressor frequency (Hz) INV step General step INV compressor frequency (Hz) + the number of STD compressors INV step General step INV compressor frequency (Hz) + the number of STD compressors STD STD STD STD STD STD STD STD STD STD STD STD STD STD STD STD ,10,12, STD STD 2 (15,20AY1) ,20AY STD STD STD STD STD STD STD 1 8AY STD STD STD STD STD AY STD STD STD STD STD STD 2 15AY STD 1 10AY STD STD STD STD STD AY STD 1 12AY STD 2 20AY1 Air Cooled Refrigeration Condensing Unit 51

53 Description of Functions and Operation SiENBE (4) Fan control Outdoor fan (4)-1. Outdoor fan control The outdoor fan will be controlled using the high pressure as the controlled variable, as shown in the flow below. Fan control Every 20 to 60 seconds Fan speed-up control Increases the speed by 1 tap. or Lpm: Pressure equivalent to the target evaporation temperature HP: High pressure <For 5, 6, 15, and 20AY1 models> & Lpm < 0.59 MPa HP > 1.86 MPa & Lpm 0.59 MPa HP > Lpm MPa Every 60 seconds Fan speed-down control Reduces the speed by 1 tap. High pressure fan control INV fin temperature control <For 8, 10, and 12AY1 models> HP Lpm MPa <For 5, 6, 15, and 20AY1 models> HP < Lpm MPa & HP < 1.27 MPa <For 8, 10, and 12AY1 models> HP < Lpm MPa TcL: Saturation temperature equivalent to high pressure Ta: Outdoor temperature HP 2.74 MPa Max. fan tap & & & HP 2.45 MPa TcL > Ta + 18 C Increases the speed by 2 taps. HP 2.45 MPa TcL Ta + 18 C Increases the speed by 1 tap. HP 2.45 MPa While the outdoor fan is not in operation Increases the speed by 1 tap. (This assumes that the low pressure outdoor fan is being controlled.) Inverter fin temperature > 79 C Increases the speed by 1 tap. (4)-2. Fan control before startup The fan revolution will be set based on the outdoor temperature. This is intended to prevent the pressure from rising too rapidly and ensure the proper differential pressure. Outdoor temperature Ta<3 C 3 C Ta <9 C 9 C Ta <15 C 15 C Ta <21 C 21 C Ta <28 C Ta 28 C LRM(L)EQ5AY1,6AY LRM(L)EQ8AY1,10AY1,12AY LRM(L)EQ15AY, 20AY (4)-3. Outdoor fan residual operation Reduces the high pressure to some degree when the thermostat is turned off. This will minimize the amount of sluggish refrigerant that is trapped due to high pressure when the system is stopped. The fan will operate continuously for either 30 seconds after the compressors are turned off, or as long as the high pressure (HP) stays below 1.18 MPa. (4)-4. Fan upper limit control based on the outdoor temperature The fan upper speed will be limited based on the outdoor temperature. This will help reduce the operating sound. Fan tap 9 tap 6 or 7 tap 5 or 6 tap 26 C 28 C 31 C 33 C Amb. temp. ( C) 52 Air Cooled Refrigeration Condensing Unit

54 SiENBE Description of Functions and Operation (4)-5. Outdoor fan tap table LRM(L)EQ5AY1 Fan (Fan tap) Outdoor fan (standard mode) Revolution (rpm) Fan (Fan tap) Outdoor fan (high static pressure mode) Revolution (rpm) LRM(L)EQ6AY1 Fan (Fan tap) Outdoor fan (standard mode) Revolution (rpm) Fan (Fan tap) Outdoor fan (high static pressure mode) Revolution (rpm) LRM(L)EQ8AY1 Fan (Fan tap) Outdoor fan (standard mode) Revolution (rpm) Fan (Fan tap) Outdoor fan (high static pressure mode) Revolution (rpm) LRM(L)EQ10AY1 Fan (Fan tap) Outdoor fan (standard mode) Revolution (rpm) Fan (Fan tap) Outdoor fan (high static pressure mode) Revolution (rpm) LRM(L)EQ12AY1 Fan (Fan tap) Outdoor fan (standard mode) Revolution (rpm) Fan (Fan tap) Outdoor fan (high static pressure mode) Revolution (rpm) LRM(L)EQ15AY1 Fan (Fan tap) Outdoor fan (standard mode) Revolution (rpm) Fan (Fan tap) Outdoor fan (high static pressure mode) Revolution (rpm) LRM(L)EQ20AY1 Fan (Fan tap) Outdoor fan (standard mode) Revolution (rpm) Fan (Fan tap) Outdoor fan (high static pressure mode) Revolution (rpm) Air Cooled Refrigeration Condensing Unit 53

55 Description of Functions and Operation SiENBE (5) Electrical expansion valve control (5)-1. Outdoor electrical expansion valve (Y1E(EV1)) This only applies to the Japanese domestic models. The valve will be activated when the reverse cycle defrost is used. For the LRM(L)EQ** models, a "0pls" command will be used all times. (5)-2. Outdoor electrical expansion valve (Y2E(EV2)) This valve will provide refrigerant gas injection flow rate control, overheating protection, and condensation protection. Initial valve opening: 43pls (mode 1), 55pls (modes other than mode 1) Control flow Outdoor EV2 condensation avoidance control or & The discharge pipe temperature thermistor value < 60 C Intermediate superheat (SH) <8 to 12K continuously for 20 seconds or more. or Every 10 seconds Outdoor EV2 Every 20 seconds Outdoor EV2 overheat normal control protection control INV compressor continues to operate for 60 seconds or more STD compressor continues to operate for 90 seconds or more. Min (discharge pipe SH, forecasted port SH) < 15 C Every 20 sec. or Discharge pipe temperature > 80 C Discharge pipe temperature 80 C Forecasted port temperature 1 > 110 C Forecasted port temperature 2 > 130 C Discharge pipe temperature > 90 C Discharge gas temperature control Intermediate SH control The target discharge pipe temperature is controlled to be 90 C. Controlled for target intermediate SH (8 to 12 C) (5)-3. Outdoor electronic expansion valve (Y3E(EV3)) An electronic expansion valve is installed in the intermediate injection line of the INV compressor. The valve will operate in synch with the INV compressor, and allow the refrigeration oil to be returned to the INV compressor(s) that are in operation. It also creates an economizer circuit by means of gas injection. In addition, the valve will control the difference in discharge pipe temperatures between INV and STD compressors. Outdoor EV3 control Operation of one INV compressor EV3: 480pls INV compressor + STD compressor EV3 will be controlled using the difference in discharge pipe temperatures of the INV and STD compressors. 43pls EV3 480pls (6) Solenoid valve control For 8, 10, 12, 15, and 20 AY1 models, a solenoid valve is installed in the intermediate injection line of the STD compressor. The valve will operate in synch with STD compressor, and allow the refrigeration oil to be returned to the STD compressor(s) that are in operation. Additionally, the valve will create a gas injection economizer circuit. 54 Air Cooled Refrigeration Condensing Unit

56 SiENBE Description of Functions and Operation (7) Oil return control Recover the refrigeration oil that has been left standing in the system at regular intervals. Recover the oil into the outdoor unit, using a timer and low pressure. Oil return control Oil return by turning on/off the indoor unit solenoid valve Oil return by increasing the compressor frequency Objective: Recovers the refrigeration oil from the evaporator by putting the refrigerant into a wet state by utilizing a delay in response to the mechanical expansion valve. The operation output will be turned on/off using the actual low pressure. Objective: Increases the compressor speed to provide sufficient refrigerant speed in the suction pipe. Then the oil left standing in the suction pipe will be recovered into the outdoor unit. Normal capacity control Continuous operation time during oil return 40 minutes or 90 seconds have passed Low pressure (LP) MPa Recovering the oil by turning on/off the indoor solenoid valve Indoor solenoid valve: ON or or HP<3.04MPa LP>0.245MPa HP<3.04MPa LP<0.196MPa 30 seconds have passed. Indoor solenoid valve: OFF Normal performance control The circulating volume used for oil return continues to be less than specified for 60 to 120 minutes or more. (*1) or The circulating volume used for oil return continues to be more than specified for 5 minutes Oil return has continued for 10 minutes. Recover the oil by increasing the compressor frequency (*1) LP High Low Compressor steps Low load High load Oil return interval: Long Oil return interval: Short (8) Four way valve control To standardize the hardware with the Japanese domestic models, the European models are also equipped with four-way valves. The circulation volume has been factory set to insure that the four-way valve switches over properly. This allows the valve to be initialized to the proper position when the power is turned on. ON condition: The valve will be activated when the differential pressure at start-up is MPa or less. OFF condition: The differential pressure stays above 0.49 MPa for 10 seconds, or the watchdog timer reaches 90 seconds. (Low, high pressure and discharge gas protection will take priority.) For 5 and 6 AY1 models, the INV compressor steps will be increased. For the other models, the STD compressors will be operated. (9) High pressure protection control If the following condition is met, the compressor load will be reduced significantly, as shown in the block diagram below. After multiple retries are made and the retry counter is reached, the compressor will stop and declare a problem (abnormal stop). (For details, see the list of errors.) The high-pressure retry code "E3" and the number of retries will be sent to the AIRNET. High pressure sensor>3.479 MPa. Operating mode 3, 4 2, 5 1 Stops the STD2 compressor. Stops the STD1 compressor. Reduces the INV compressor by 5 steps. If the high pressure switch (operating pressure: 3.8 MPa) is activated (high pressure sensor reading MPa), the compressor will stop and declare a problem (abnormal stop). To reset, turn off the power switch (or operation switch) and turn it back on again. Air Cooled Refrigeration Condensing Unit 55

57 Description of Functions and Operation SiENBE (10) Low pressure protection control If the pressure drops below 0.00 MPa, the system will cease operation. After 2 to 10 minutes in standby, the system will resume operation. For a period of 3 hours after power-up, the system will continue to check whether the suction stop valve is closed. If the stop valve is seen to be closed, the system will stop and declare a problem (abnormal stop). Three hours after the system was turned on, the system will no longer stop due to an abnormally low pressure. (The low pressure retry code "E4" will be sent to the AIRNET.) (11) Overheat protection control If any of the following conditions is met, the system will cease operation. INV compressors will resume operation after 2 to 6 minutes in standby, while STD compressors will restart after 3 to 10 minutes. If a particular compressor repeats this procedure 10 times, "F3" will be sent to the AIRNET; if it repeats it 15 times, the compressor will stop. For 5 and 6AY1 models, the compressors will stop and declare a problem (abnormal stop). For 8, 10, 12, 15, and 20AY1 models, the remaining compressors will perform a backup operation. The discharge gas temperature >120 C for 70 seconds. or The discharge gas temperature >125 C for 30 seconds. The discharge gas temperature >130 C If the following condition is met, the relevant compressor will stop immediately and declare a problem (abnormal stop). The discharge gas temperature 150 C. (12) STD compressor overcurrent protection control The following condition is met, the system will stop operation. STD compressors will resume operation after 30 minutes in standby. If a compressor repeats this procedure twice, "E0" will be sent to the AIRNET. If it repeats it three times, the relevant compressor will stop. The STD compressor current >14.95A for 2.1 seconds or more. (13) Earth leakage detection control 1. Detection using a earth leakage detection board If the high-pressure sensor reading exceeds MPa, the earth leakage detector PCB will be activated. Then the compressor operation will stop and declare a problem (abnormal stop). To reset, turn off the power switch (or operation switch) and turn it back on again. 2. Detection during initial power-up The system will check for earth leakage while the compressor is running for the first 10 seconds after power-up. A compressor will stop abnormally if the power breaker is turned off or the earth leakage detector PCB is activated during the 10-second period describe above. If the breaker is turned off, turn the breaker on again. If the same thing happens again, disable the defective compressor and perform a backup operation using the remaining compressors. With the operation switch in OFF, reset the system by turning on the power off and then back on again. 56 Air Cooled Refrigeration Condensing Unit

58 SiENBE Test Operation 5. Test Operation 5.1 Refrigerant Piping [REFRIGERANT] This System use R410A refrigerant. Caution This unit is already filled with a certain amount of R410A. Never open liquid and gas shutoff valve until the step Specified in 5.4. CHECKS AFTER WORK COMPLETION. The refrigerant R410A requires strict cautions for keeping the system clean, dry and tight. Read this chapter carefully and follow these procedures correctly. A.Clean and dry Foreign materials (including mineral oils such as SUNISO oil or moisture) should be prevented from getting mixed into the system. B.Tight Take care to keep the system tight when installing. R410A does not contain any chlorine, does not destroy the ozone layer, and does not reduce the earth s protection against harmful ultraviolet radiation. R410A can contribute slightly to the greenhouse effect if it is released. Since R410A is a mixed refrigerant, the required additional refrigerant must be charged in its liquid state. If the refrigerant is charged in a state of gas, its composition changes and the system will not work properly. Be sure to perform refrigerant replenishment. Refer to 5.4 CHECKS AFTER WORK COMPLETION and the label of instructions on refrigerant replenishment on the cover surface of the control box, [Important information regarding the refrigerant used] This product contains fluorinated greenhouse gases covered by the Kyoto Protocol. Do not vent gases into the atmosphere. Refrigerant type : R410A GWP (1) value : 2090 (1) GWP = global warming potential Please fill in with indelible ink, 1 the factory refrigerant charge of the product, 2 the additional refrigerant amount charged in the field and the total refrigerant charge on the refrigerant charge label supplied with the product. The filled out label must be adhered in the proximity of the product charging port (e.g. onto the inside of the service cover). Contains fluorinated greenhouse gases covered by the Kyoto Protocol (1)= R410A (2) (1) 6 5 (2)= (1)+(2)= kg kg kg factory refrigerant charge of the product : see unit name plate 2 additional refrigerant amount charged in the field 3 total refrigerant charge 4 Contains fluorinated greenhouse gases covered by the Kyoto Protocol 5 outdoor unit 6 refrigerant cylinder and manifold for charging [DESIGN PRESSURE] Since design pressure is 3.8MPa or 38bar (for R407C units : 3.3MPa or 33bar), the wall thickness of pipes should be more carefully selected in accordance with the relevant local and national regulations. Air Cooled Refrigeration Condensing Unit 57

59 Test Operation SiENBE To Piping Work Contractors Never open the shutoff valve until the steps specified in 5.2 FIELD WIRING and Checking of device and installation conditions of piping. Do not use flux at the time of brazing and connecting refrigerant pipes. Use phosphorous copper brazing filler metal (BCuP-2), which does not require flux. Chlorine-based flux causes piping corrosion. Furthermore, if fluoride is contained, the flux will have adverse influences on the refrigerant piping line, such as the deterioration of refrigerating machine oil. Caution All field piping must be installed by a licensed refrigeration technician and must comply with relevant local and national regulations. [Precautions for reuse of existing refrigerant piping / heat exchangers] Keep the following points in mind for the reuse of existing refrigerant piping / heat exchangers. A malfunction may result if there is deficiency. Do not use the existing piping in the following cases. Perform new piping instead. The piping is different in size. The strength of the piping is insufficient. The compressor of the condensing unit previously used caused a malfunction. An adverse influence of residual substances, such as the oxidation of refrigerant oil and the generation of scale, is considered. If the indoor unit or outdoor unit is disconnected from the piping for a long time. The intrusion of water and dust into the piping is considered. The copper pipe is corroded. The refrigerant of the condensing unit previously used was other than R410A (e.g., R404A / R507 or R407C). The contamination of the refrigerant with heterogeneity is considered. If there are welded connections midway on the local piping, make gas leakage checks on the welded connections. Be sure to insulate the connection piping. The liquid and gas pipe temperatures are as follows: Liquid pipe arrival minimum temperature: 0 C Gas pipe arrival minimum temperature: 26 C (Refrigeration Series) 46 C (Freezer Series) In the case of thickness insufficiency, add additional insulation material or renew the existing insulation material. Renew the insulation material if the insulation material is degraded. Keep the following points in mind for the reuse of existing heat exchangers Units with insufficient design pressure (since this product is an R410A unit) require a lowerstage design pressure of 2.5 MPa [25 bars]. Units for which the path to the heat exchanger has been routed so that the flow of refrigerant is from bottom to top Units with copper tubing or fan corrosion Units that may be contaminated with foreign matter such as rubbish or other dirt 58 Air Cooled Refrigeration Condensing Unit

60 SiENBE Test Operation Selection of Piping Material Make sure that the inner side and outer side of the piping used is clean and free of contaminants, such as sulphur, oxide, dust, chips, oil and fat, and water. It is desirable that the maximum oil adhesion in the piping is 30 mg per 10 m. Use the following type of refrigerant piping. Material: Seamless phosphorus deoxidized copper tube (C1220T-O for a maximum outer diameter of 15.9 mm and C1220T-1/2H for a minimum outer diameter of 19.1 mm) Refrigerant piping size and wall thickness: Decide the size and thickness from the following table. (This product uses R410A. The withstand pressure of O type may be insufficient if it is used for piping with a minimum diameter of 19.1 mm. Therefore, be sure to use 1/2 H type with a minimum thickness of 1.0 mm. If O type is used for piping with a minimum diameter of 19.1 mm, a minimum thickness of 1.2 mm will be required. In that case, be sure to perform the blazing of each joint.) Be sure to perform piping work within the range specified in the following table. Refrigerant piping length Max. permissible LRMEQ5~20AY1 a + b + c + d 130m (d is d1 or d2 or e, f whichever is longer) Outdoor unit one-way piping length (equivalent length) LRLEQ5~20AY1 a + b + c + d 70m (d is d1 or d2 whichever is longer) Max. branch piping length (actual length) b + c + d 30m (d is d1 or d2 whichever is longer) Liquid piping A B C D2 Max. difference in unit below outdoor unit H 35m (Note) height between indoor H F E D1 and outdoor units unit above outdoor unit H 10m Difference in height between indoor units H1 5m Showcase H1 Unit Note: A trap is required at 5 m intervals from outdoor unit. cooler f e d1 Refrigerant piping size (MT (Medium Temperature)) LRMEQ5~20AY1 a b c d2 (Unit : mm) Piping size Outdoor unit side Liquid pipe Gas pipe 50m or less 50~130m 50m or less 50~130m 5A 6A type φ (O type) φ (O type) φ (1/2H type) φ (1/2H type) 8A 10A 12A type φ (O type) φ (O type) φ (1/2H type) φ (1/2H type) 15A 20A type φ (O type) φ (O type) φ (1/2H type) φ (1/2H type) Piping between branching areas (B, b, C, c) Select the piping from the following table in accordance with the total capacity of indoor units connected downstream. Total capacity of indoor units after branching Gas pipe size Liquid pipe size Less than 6.0 kw φ (O type) φ (O type) 6.0 kw or over and less than 9.9 kw φ (O type) 9.9 kw or over and less than 14.5 kw φ (1/2H type) 14.5 kw or over and less than 18.5 kw φ (1/2H type) φ (O type) 18.5 kw or over and less than 25.0 kw φ (1/2H type) 25.0 kw or over and less than 31.0 kw φ (1/2H type) φ (O type) 31.0 kw or over φ (1/2H type) No size after branching can exceed the size of any upstream piping. Piping between branching areas and each unit Adjust the size of the piping so that it will coincide with the size of piping connecting to the indoor unit. (LT (Low Temperature)) LRLEQ5~20AY1 (Unit : mm) Outdoor unit side Piping size Liquid pipe Gas pipe 50m or less 50~70m 25m or less 25~70mm 5A 6A type φ (O type) φ (O type) φ (1/2H type) φ (1/2H type) 8A 10A 12A type φ (O type) φ (O type) φ (1/2H type) φ (1/2H type) 15A 20A type φ (O type) φ (O type) φ (1/2H type) φ (1/2H type) Piping between branching areas (B, b, C, c) Select the piping from the following table in accordance with the total capacity of indoor units connected downstream. Total capacity of indoor units after branching Gas pipe size Liquid pipe size Less than 2.3 kw φ (O type) φ (O type) 2.3 kw or over and less than 4.4 kw φ (O type) 4.4 kw or over and less than 6.4 kw φ (1/2H type) 6.4 kw or over and less than 7.8 kw φ (1/2H type) φ (O type) 7.8 kw or over and less than 10.8 kw φ (1/2H type) Gas piping Piping between branching areas and each unit 10.8 kw or over and less than 13.4 kw φ (1/2H type) φ (O type) 13.4 kw or over φ (1/2H type) No size after branching can exceed the size of any upstream piping. Adjust the size of the piping so that it will coincide with the size of piping connecting to the indoor unit. Air Cooled Refrigeration Condensing Unit 59

61 Test Operation SiENBE Drier Installation Caution This product requires that a drier be installed on liquid piping on site. (Operating the unit without a drier installed may result in equipment failure.) Select a drier from the following chart: Model LRMEQ5AY1, LRLEQ5AY1 LRMEQ6AY1, LRLEQ6AY1 LRMEQ8AY1, LRLEQ8AY1 LRMEQ10AY1, LRLEQ10AY1 LRMEQ12AY1, LRLEQ12AY1 LRMEQ15AY1, LRLEQ15AY1 LRMEQ20AY1, LRLEQ20AY1 Required dryer core (recommended type) 80g (100% molecular sieve equivalent) (DML083/DML083S : Danfoss made) 160g (100% molecular sieve equivalent) (DML163/DML163S : Danfoss made) 160g (100% molecular sieve equivalent) (DML164/DML164S : Danfoss made) Install the drier in a horizontal orientation wherever possible. Install the drier as close to the outdoor unit as possible. Remove the drier cap immediately before brazing (to prevent absorption of airborne moisture). Follow instructions in the drier instruction manual concerning drier brazing. Repair any burning of drier paint that occurs during drier brazing. Contact the manufacturer for more information about paint for repair use. Flow direction is specified for some type of the dryer. Set the flow direction according to the operation manual of the dryer Operation Method of Shutoff Valves Follow the instructions below when operating each shutoff valve. Caution Do not open the shutoff valve until the steps specified in Checking of device and installation conditions is completed. Do not leave the shutoff valve opened without turning the power on, otherwise refrigerant may be condensed in the compressor and the insulation of the main power supply circuit may be degraded. Be sure to use an exclusive tool to handle the shutoff valve. The shutoff valve is not of back sheet type. Excessive force imposed may break the valve. Use a charge hose when using the service port. Make sure that there is no refrigerant gas leakage after the valve cover and cap are securely tightened. Tightening torque Check with the following table the sizes of shutoff valves incorporated by each model and the tightening torque values of the respective shutoff valves. Shutoff valve sizes Liquid side shutoff valve Gas side shutoff valve 5A type 6A type 8A type 10A type 12A type 15A type 20A type φ9.5 φ12.7 φ19.1 φ25.4 φ31.8 Service port Valve cover Sealing part Shaft Hexagon hole 60 Air Cooled Refrigeration Condensing Unit

62 SiENBE Test Operation Shutoff Tightening torque N m (closes clockwise) valve sizes Shaft (valve body) Valve cover Service port φ ~6.5 Hexagon wrench: 13.5~16.5 φ ~9.9 4mm 18.0~22.0 φ ~33.0 Hexagon wrench: φ25.4 8mm 22.5~ ~13.9 φ ~29.4 Hexagon wrench: 10mm 44.1~53.9 Opening method 1. Remove the valve cover and turn the shaft anticlockwise with a hexagon wrench. 2. Turn the shaft until the shaft stops. 3. Tighten the valve cover securely. Refer to the above table for the tightening torque according to the size. Closing method 1. Remove the valve cover and turn the shaft clockwise with a hexagon wrench. 2. Tighten the shaft until the shaft comes in contact with the sealing part of the valve. 3. Tighten the valve cover securely. Refer to the above table for the tightening torque according to the size. Handling Precautions for Valve Cover Be careful not to damage the sealing part. At the time of mounting the valve cover, apply a screw lock agent to the screw thread. Do not apply a screw lock agent (for flare nut use) to the sealing part. Be sure to tighten the valve cover securely after operating the valve. Refer to Operation Method of Shutoff Valves for the tightening torque of the valve. Valve cover Screw thread Apply a screw lock agent Sealing part Not apply a screw lock agent Shutoff valve Part of mounting the valve cover. Handling Precautions for Service Port Work on the service port with a charge hose provided with a pushing rod. At the time of mounting the cap, apply a screw lock agent to the screw thread. Do not apply a screw lock agent (for flare nut use) to the sealing part. Be sure to tighten the cap securely after the work. Refer to Operation Method of Shutoff Valves for the tightening torque of the cap. Sealing part Not apply a screw lock agent Cap Screw thread Apply a screw lock agent Air Cooled Refrigeration Condensing Unit 61

63 Test Operation SiENBE Precautions for Piping Perform piping branching with the following conditions kept in mind. At the time of branching the liquid piping, use a T-joint or Y-joint and branch it horizontally. This will prevent an uneven flow of refrigerant. At the time of branching gas piping, use a T-joint and branch it so that the branched piping will be located above the main piping (see the illustration below). This will prevent the stay of refrigerant oil in the indoor unit not in operation. Use a Y-joint for the liquid refrigerant branch and have the piping branch horizontally. Y-joint Horizontal surface ±30 or less A-arrow view A Use a T-joint for the gas refrigerant branch and connect from the top of the main piping. T-joint Main piping Indoor unit side T-joint Branch piping Make the piping slant downward Branch piping Make the piping slant downward Main piping Make the piping slant downward Outdoor unit side Make sure that the horizontal portion of the gas piping slants downward to the outdoor unit (see the illustration above). If the outdoor unit is located above, make a trap on the gas pipe at 5 m intervals from outdoor unit. This will ensure the smooth returning of oil in the piping slanting upward. 62 Air Cooled Refrigeration Condensing Unit

64 SiENBE Test Operation 5.2 Field Wiring Procedure for Power Supply Wiring Procedure for Power Supply Wiring 1 B L1 L2 L3 N Power supply (3φ 380~415) 2 Branch switch or overcurrent circuit breaker (earth leakage circuit breaker) 3 Earth wire 4 Power supply terminal block 5 Mount insulation sleeves 6 Fix the power supply wiring for phases L1, L2, L3, and N, respectively, with the provided clamp (1) to the resin clamp. 7 Fix the earth wire to the power supply wire (phase N) with the provided clamp (1). 8 Earth wire Perform wiring so that the earth wire will not come in contact with lead wires of the compressor. Otherwise, noise generated may have a bad influence on other equipment. 9 Ground terminal 10 When two wires are connected to a single terminal, connect them so that the rear sides of the crimp contacts face each other. Also, make sure the thinner wire is on top, securing the two wires simultaneously to the resin hook using the accessory clamp (1). Terminal block Crip style terminal Clamp (1) Wire: narrow Wire: thick Resin hook Power circuit, safety device, and cable requirements A power circuit (see the following table) must be provided for connection of the unit. This circuit must be protected with the required safety devices, i.e. a main switch, a slow blow fuse on each phase and an earth leakage circuit breaker. When using residual current operated circuit breakers, be sure to use a high-speed type (1 second or less) 200mA rated residual operating current. Use copper conductors only. Use insulated wire for the power cord. Select the power supply cable type and size in accordance with relevant local and national regulations. Specifications for local wiring are in compliance with IEC Use wire type H05VV when protected pipes are used. Use wire type H07RN-F when protected pipes are not used. Phase and frequency Voltage Minimum circuit amp. Recommended fuses LRMEQ5AY1 LRLEQ5AY1 φ3, 50Hz V 12.7A 15A LRMEQ6AY1 LRLEQ6AY1 φ3, 50Hz V 13.6A 15A LRMEQ8AY1 LRLEQ8AY1 φ3, 50Hz V 19.2A 25A LRMEQ10AY1 LRLEQ10AY1 φ3, 50Hz V 21.9A 25A LRMEQ12AY1 LRLEQ12AY1 φ3, 50Hz V 23.9A 25A LRMEQ15AY1 LRLEQ15AY1 φ3, 50Hz V 31.2A 40A LRMEQ20AY1 LRLEQ20AY1 φ3, 50Hz V 34.8A 40A Air Cooled Refrigeration Condensing Unit 63

65 Test Operation SiENBE Point for attention regarding quality of the public electric power supply This equipment complies with respectively: EN/IEC (1) provided that the system impedance Z sys is less than or equal to Z max and EN/IEC (2) provided that the short-circuit power S sc is greater than or equal to the minimum S sc value at the interface point between the user s supply and the public system. It is the responsibility of the installer or user of the equipment to ensure. by consultation with the distribution network operator if necessary, that the equipment is connected only to a supply with respectively: Z sys less than or equal to Z max and S sc greater than or equal to the minimum S sc value. LRMEQ5AY1 LRLEQ5AY1 LRMEQ6AY1 LRLEQ6AY1 LRMEQ8AY1 LRLEQ8AY1 LRMEQ10AY1 LRLEQ10AY1 LRMEQ12AY1 LRLEQ12AY1 LRMEQ15AY1 LRLEQ15AY1 LRMEQ20AY1 LRLEQ20AY1 Z max (Ω) minimum S sc value kVA kVA kVA kVA kVA (1) European/International Technical Standard setting the limits for voltage changes. Voltage fluctuations and flicker in public low-voltage supply systems for equipment with rated current 75A (2) European/International Technical Standard setting the limits for harmonic currents produced by equipment connected to public low-voltage systems with input current > 16A and 75A per phase. Warning, alarm, and operation output wiring connections Connect warning, alarm, and operation output wiring to the X2M terminal block and clamp as indicated by the following diagram: X2M C C1 W1 P1 P2 Mount insulation sleeves Fix the wiring with the provided clamp (1) X2M wire specifications Electric wire thickness 0.75~1.25mm 2 Max. wiring length 130m 64 Air Cooled Refrigeration Condensing Unit

66 SiENBE Test Operation Remote operating switch wiring connections When installing a remote operating switch, clamp as indicated by the following diagram: X3M 1 2 Secure remote operating switch wiring to the resin block using a clamp (field supply). X3M wire specifications Electric wire thickness 0.75~1.25mm 2 Max. wiring length 130m Caution For Remote switch, use non-voltage contact for microcurrent (not more than 1mA, 12VDC) If the remote operating switch will be used to start and stop the unit, set the operating switch to REMOTE. Air Cooled Refrigeration Condensing Unit 65

67 Test Operation SiENBE Inspection and Pipe Insulation For piping work contractor, electrical work contractor, and trial run workers Never open the shutoff valve until the insulation measurement of the main power supply circuit is finished. The measured insulation value will become lower if the measurement is made with the shutoff valve opened. On completion of inspection and refrigerant charging, open the shutoff valve. The compressor will malfunction if the condensing unit is operated with the shutoff valve closed Air tight Test/Vacuum Drying Refrigerant is enclosed in the unit. Be sure to keep both liquid and gas shutoff valves closed at the time of an airtight test or vacuum drying of the local piping. [For piping work contractor] On completion of piping work, make the following inspection precisely. To ensure that the condensing unit withstand pressure properly and prevent the penetration of foreign substances, be sure to use R410A-dedicated tools. Gauge manifold Charge hose To ensure that the condensing unit withstand pressure properly and prevent the penetration of foreign substances (water, dirt, and dust), use an R410A-dedicated gage manifold and charge hose. R410Adedicated tools and R407C-dedicated tools are different in screw specification. Pay the utmost attention so that the pump oil will not flow backward Vacuum pump into the system while the pump is not in operation. Use a vacuum pump that can vacuum down to 100.7kPa (5 Torr or 755mmHg). Gas for airtight test use Nitrogen gas Air tight Pressurize the high-pressure section of the system (liquid piping) to 3.8 MPa (38 bar) and the low-pressure section of the system (gas piping) to the design pressure (*1) of the indoor unit (field supply) from the service port (*2) (do not exceed the design pressure). The system is considered to have passed if there is no decrease in the pressure over a period of 24 hours. If there is a decrease in the pressure, check for and repair leaks. Vacuum drying Connect a vacuum pump to the service ports (*) of both the liquid and gas pipes for at least 2 hours and vacuum the unit down to kpa or below. Then leave the unit for at least 1 hour at a pressure of kpa or below and check that the vacuum gage reading will not rise. If the pressure rises, there is residual water in the system or the system has leakage. *1 Contact the manufacturer in advance for more information about the design pressure of the indoor unit (field supply). *2 Refer to the instruction label on the front panel of the outdoor unit (below) for the position of the service port. Position of instruction label Label 66 Air Cooled Refrigeration Condensing Unit

68 SiENBE Test Operation Pressure-reducing valve Nitrogen R410A Used for refrigerant replenishment Gas side shutoff valve Tank (with siphon) Meter Charge hose Note: Shutoff valve service port Liquid side shutoff valve Valve Outdoor unit To indoor unit Vacuum pump Field pipings Connection procedure for gauge manifold and vacuum pump Caution Conduct an airtight test and vacuum drying precisely through the service ports of both liquid and gas shutoff valves. Use charge hoses (provided with a pushing rod each) when using the service ports. In case of possible water intrusion into piping Perform the above mentioned vacuum drying for 2 hours first in the following cases: The product is installed in the rainy season, there is a fear of dew condensation resulting in the piping because the installation work period is long, or there is a fear of rainwater intrusion into the piping for other reasons. Then impose a pressure of up to 0.05 MPa with nitrogen gas (for vacuum destruction) and vacuum the unit down to kpa or below for 1 hour with a vacuum pump (for vacuum drying). Repeat vacuum destruction and vacuum drying if the pressure does not reach kpa or below after a minimum of 2 hours vacuuming. Leave the vacuum state for 1 hour then, and check that the vacuum gauge reading will not rise Thermal Insulation Work Be sure to perform thermal insulation of the piping after the airtight test and vacuum drying. Be sure to perform the thermal insulation of the liquid and gas pipes in the connecting piping. Otherwise, water leakage may result. Be sure to insulate liquid and gas connection piping. Failure to do so may result in water leakage. Consult the following chart as a general guide when selecting the insulation thickness. Liquid pipe arrival minimum temperature 10 C Gas pipe arrival minimum temperature 20 C (MT (Medium Temperature)) 40 C (LT (Low Temperature)) Reinforce the insulation material for the refrigerant piping according to the environment of thermal installation. Otherwise, the surface of the insulation material may result in dew condensation. If the dew condensation water on the shutoff valves is likely to flow to the indoor unit side through the clearance between the insulation material and piping because the outdoor unit is installed above the indoor unit or for some other reasons, perform appropriate treatment such as the caulking of the joints (see the illustrations below). Attach the cover of the piping outlet with a knock hole opened. If there is a feature of small animals intruding through the piping outlet, cover the piping outlet with a blocking material (field supply) on completion of the steps of 5.5 Additional Refrigerant Charge (see the illustrations below). Use the piping outlet for jobs required during the steps of 5.5 Additional Refrigerant Charge (e.g., a job of taking in the charge hose). Air Cooled Refrigeration Condensing Unit 67

69 Test Operation SiENBE Liquid side shutoff valve Indoor/Outdoor interunit piping Gas side shutoff valve Coking, etc. Insulation material Piping lead-out hole lid Block Liquid side piping Open a knock hole at Gas side piping Note: After knocking out the holes, we recommend you remove burrs in the knock holes and paint the edges and areas around the edges using the repair paint Checking of Device and Installation Conditions Be sure to check the followings. <For those doing electrical work> 1. Make sure there is no faulty power wiring or loosing of a nut. See Procedure for Power Supply Wiring. 2. Has the insulation of the main power circuit deteriorated? Measure the insulation and check the insulation is above regular value in accordance with relevant local and national regulations. <For those doing pipe work> 1. Make sure piping size is correct. See Selection of Piping Material. 2. Make sure insulation work is done. See Thermal Insulation Work. 3. Make sure there is no faulty refrigerant piping. See 5.1. REFRIGERANT PIPING. 68 Air Cooled Refrigeration Condensing Unit

70 SiENBE Test Operation 5.4 Checks after Work Completion Make sure the following works are complete in accordance with the installation manual. Piping work Wiring work Air tight test/vacuum drying Installation work for indoor unit 5.5 Additional Refrigerant Charge For refrigerant filling contractor Use R410A for refrigerant replenishment. The R410A refrigerant cylinder is painted with a pink belt. Warning Electric Shock Warning Securely close the control box lid before turning power on. Before turning power on, check through the inspection hole (on the left-hand side) of the control box lid that the RUN switch is set to OFF. If the RUN switch is set to ON, the fan may rotate. Check the LED indicators on the PCB (A1P) of the outdoor unit through the inspection hole (on the right-hand side) of the control box lid after the outdoor unit is turned on (see the illustration). (The compressor will not operate for approximately 2 minutes after the outdoor unit is turned on. H2P blinks for the first five seconds when the power supply is turned on. If the equipment is normal, H2P will be turned off in five seconds. H2P lights for abnormality.) Inspection hole (right-hand side) (upper right-hand side of control box) Control box lid LED (H1~8P) Lift up this tab and open the cover. Inspection hole (left-hand side) Control box Inspection hole cover Inspection hole (right-hand side) RUN switch (factory set: OFF) REMOTE OFF ON Inspection hole (left-hand side) (upper left-hand side of control box) Warning Use protective gear (e.g., protective gloves and glasses) at the time of refrigerant filling. Pay attention to the rotation of the fan whenever the front panel is opened while working. The fan can rotate continuously for a while after the outdoor unit stops operating. Air Cooled Refrigeration Condensing Unit 69

71 Test Operation SiENBE [Additional Refrigerant Charge] Caution Refer to the Operation Method of Shutoff Valves for the control method of the shutoff valves. Never charge liquid refrigerant directly from a gas line. Liquid compression may cause the compressor to fail. 1. The refrigerant must be noted for this product. Calculate the amount of additional refrigerant charge according to the label for the calculation of the amount of additional refrigerant charge. 2. Take the following procedure for additional refrigerant charge. Refer to Airtight Test/Vacuum Drying for the connection of the refrigerant cylinder. (1) Turn on the indoor unit and control panel. Do not turn on the outdoor unit. (2) Charge additional refrigerant from the service port of the shutoff valve on the liquid side. (3) If the calculated amount of refrigerant cannot be filled, take the following steps to operate the system and continue additional refrigerant charge. a. Open the gas shutoff valve all the way and adjust the opening of the liquid shutoff valve (*1). b. [Warning/Electric Shock Warning] Turn on the outdoor unit. c. [Warning/Electric Shock Warning] Turn on the RUN switch of the outdoor unit and replenish refrigerant while the outdoor unit is in operation. d. Turn off the RUN switch of the outdoor unit after the specified amount of refrigerant is replenished. e. [Caution] Fully open the shutoff valves on the gas and liquid sides promptly. Otherwise, a piping explosion may result from liquid sealing. Control box Label of instructions on additional refrigerant charge Label pasting position *1 The cylinder s internal pressure will drop when there is little refrigerant remaining in the cylinder, making it impossible to charge the unit, even if the liquid shutoff valve opening is adjusted. In this situation, replace the cylinder with one that has more refrigerant remaining. Additionally, if the piping length is long, additional charging while the liquid shutoff valve is fully closed may lead to activation of the protection system, causing the unit to stop operation. 1. After the work is completed, apply a screw lock agent (for flare nuts) to the screws of the shutoff valves and service ports. 2. After the additional refrigerant charge is completed, fill out the item total amount of additional refrigerant charge on the label of instructions on additional refrigerant charge of the outdoor unit with the actual amount of additional refrigerant charge. Refer to the illustration of the label pasting position for instructions on additional refrigerant charge (see the illustration on the above). 70 Air Cooled Refrigeration Condensing Unit

72 SiENBE Test Operation [Precautions for refrigerant cylinder] At the time of refrigerant filling, check whether the siphon tube is provided. Then locate the cylinder so that the refrigerant will be filled in the state of liquid (see table below). R410A is a mixed refrigerant, the composition of which may change and the normal operation of the system may not be possible if the refrigerant is filled in the state of gas. Cylinder provided with siphon tube. Other cylinders Stand the cylinder upright and fill the refrigerant. (There is a siphon tube inside, which makes it possible to replenish the refrigerant in the state of liquid without setting the cylinder upside down.) Stand the cylinder upside down and fill the refrigerant. (Pay attention so that the cylinder will not topple down.) [Check through sight glass] Full of liquid A little foam flows. Foam always comes out. Sight glass Sealing state Refrigerant insufficiency Caution Fully open the shutoff valves on the liquid and gas sides after the additional refrigerant charge is finished. The compressor will malfunction if the system is operated with the shutoff valves closed. Apply a screw lock agent to the screws of the valve cover mounting parts and service ports. (Otherwise, dew condensation water will intrude and freeze inside and cause cap deformation or damage, which may result in refrigerant gas leakage or compressor malfunctions.) 5.6 Test Run For test run operators Do not operate the outdoor unit alone on a trial basis. Test run procedure Use the following procedure to perform a test run after installation work is complete for the entire system: 1. Fully open the shutoff valves on the gas and liquid sides of the outdoor unit. 2. Set the RUN switch of the outdoor switch to ON. Note: Before turning power on, check that the piping cover and control box lid of the outdoor unit are closed. 3. Check the sealing condition of the outdoor unit through the sight glass. Make sure that the amount of refrigerant is sufficient. 4. Make sure that cold air blows from the indoor unit. Check that the internal temperature is dropping. (Check that the temperature will drop and reach the set temperature in the internal unit. It will take approximately 40 minutes for the interior temperature of the internal unit to reach 20 C.) Check that the indoor unit (for refrigeration or freezing) goes into defrosting operation. 5. Turn power off with the RUN switch of the outdoor unit set to OFF. (Stopping unit operation by disconnecting the power supply directly is dangerous. When the unit is stopped in this manner, its power outage compensation function may cause it to resume operation as soon as the power supply is reactivated. Additionally, stopping the unit in this manner may cause the compressor to fail). Air Cooled Refrigeration Condensing Unit 71

73 Test Operation SiENBE Error diagnosis If the system cannot operate normal at the time of test run (i.e., the H2P indicator is lit), check with malfunction code on the system with the pushbutton switches on the PCB of the outdoor unit, and take the following steps. Make checks on other malfunction codes and pushbutton switches by referring to the provided Technical Guide. LED indication (BS3 switch pressed once) (BS2 switch pressed once) Installation failure H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P l k h h h l l The shutoff l h k h h l l or l k h h l h h l h k h l l l l k h h l h h l h k l h h l l k h h h h l valves were left closed. The passage of air is blocked. Reverse-phase wiring of power supply Remedy Fully open the shutoff valves. Remove obstacles that block the passage of air. Exchange two wires out of the three power supply wires. l h k l h h l l k h h h l h l h k h l l l l k h l h h l Voltage drop Make a voltage drop check. l h k h h l l l k h h h l h Electric leak See *1 below. l h k h l l l l k h l l h h l h k h l h h l k h h h l l Normal monitor (HAP) LED off. Open L2 phase Open L1 phase Verify power supply wiring connections. h OFF k ON l BLINK *1 Set the operating switch to the OFF position to reset the power supply and then return the switch to the ON position to restart the unit. If the problem persists, refer to the Service Manual. Caution Do not disconnect the power supply for 1 minute after setting the operating switch to ON. Electric leak detection is performed for several seconds after the operating switch is set to ON and each compressor starts operating, so disconnecting the power supply during that time will result in a false detection. 72 Air Cooled Refrigeration Condensing Unit

74 SiENBE Troubleshooting 6. Troubleshooting 6.1 Checking Points at Servicing Symptoms and check points Symptoms Check points Countermeasure and check details Temperature inside the showcase is at abnormal level. Equipment does not run. Is the outdoor unit running? Is the sight glass liquid-sealed (in cooling)? Is the showcase's fan running? Is the showcase's solenoid valve operating properly? Is the showcase's thermostatic expansion valve operating properly? (No broken capillaries?) Is the defrost operation conducted properly? (No excessive frosting?) Is the outdoor unit heat exchanger blocked with dust or the like? Is the air curtain blocked at the air outlet or inlet of showcase? Check to be sure the malfunction code on the remote controller. Check to be sure the malfunction LED display on the outdoor unit PCB. Check the operation switch, signal line R1 R2 and malfunction display. Charge refrigerant. Check the disconnection, and malfunction. (in the showcase) Rectify the solenoid valve. Check the state of mounting the body and feeler bulb. Actuate the forced defrosting. Check the defrosting cycle and the disconnection in the heater. Clean the heat exchanger. Remove the obstacles. Countermeasure to the malfunction code. Countermeasure to the malfunction LED display. The following symptoms are not malfunctions Equipment does not operate. Sounds are produced. The outdoor unit fan does not run. Symptoms When the equipment is restart immediately after it stops. Immediately after power supply in turned ON. (Outdoor unit) A faint continuous hissing sound produced while in refrigerating operation. (Outdoor unit) A faint continuous hissing sound produced immediately after startup or stop of the unit. (Outdoor unit) An operating sound changes in the tone interval. While in operation. Causes The equipment is controlled in an affordable way. The equipment will automatically start running after a lapse of 1 to 5 min. The equipment is kept in standby mode until the micro-computer gets ready for operation. Wait for a period of approx. 2 min. This is a sound produced when gas (refrigerant) flows to the outdoor unit. This is a sound when gas (refrigerant) stops flowing or the flow is changed. This sound is produced through changing the compressor operating frequency. The fan speed is controlled in order to put the equipment into optimum operating conditions. Air Cooled Refrigeration Condensing Unit 73

75 Troubleshooting SiENBE Guideline for right operating conditions. Item Measuring method Right range High pressure (MPa) Low pressure (MPa) Discharge pipe temperature ( C) Suction pipe temperature ( C) Measure with a service checker or pressure gauge in a stable state 20 minutes or more after starting operation. Measure with a service checker or pressure gauge in a stable state 20 minutes or more after starting operation. Measure the temperature using a surface thermometer or service checker. Measure the temperature using a surface thermometer or service checker MPa 0.0 MPa to target LPm MPa (Tc + 10) to 120 C Tc: high pressure equivalent saturation temperature (Te + 10) to 50 C Te: low pressure equivalent saturation temperature Operating conditions: outdoor temp.: 32 CD.B. Note that the values shown above may vary significantly, depending on the environment in which the unit is being used. 2. Emergency operation in the case of a compressor with poor electrical insulation (This only applies to a system with multiple compressors.) Usually, if a compressor stops because of a problem, the system will automatically perform a backup operation (i.e., emergency operation) using other, properly-functioning compressors. However, if the source breaker trips due to poor electrical insulation of a compressor, the whole system will shut down and no backup operation will be possible. If this happens, you need to run the other working compressors using the following procedures Procedure of emergency operation Operating the main circuit breaker twice makes it possible to conduct the forced backup operation. (i.e., to prohibit the operation of compressors having a failure in insulation and only to forcedly run operable compressors.) (Procedures) 1. Set the main circuit breaker of the outdoor unit to ON. Restarting operation will make automatic judgement on the insulation conditions of parts concerned again. "Malfunction judgement": The main circuit breaker will be set to OFF again. "Normal judgement": The operation will be continued. 2. Set the main circuit breaker to ON again. (The forced backup operation will be initiated.) Precautions: The timing to turn OFF the circuit breaker varies with faulty parts. If the INV compressor has a failure in insulation, the circuit breaker will be immediately activated. However, if the STD compressor has a failure in insulation, it may take time to activate the circuit breaker due to loads applied. 74 Air Cooled Refrigeration Condensing Unit

76 SiENBE Troubleshooting 2-2. Procedures to be taken after beginning emergency operation until compressor replacement is complete and normal operation resumes 1.Change the outdoor unit operation switch from "LOCAL" or "REMOTE" to "OFF". 2.Turn off the outdoor unit's main breaker. 3.Replace the defective compressor with a new one. 4.Turn the outdoor unit breaker back on. (*Make sure that the operation switch is set to "OFF" before turning on the main breaker.) 5.Change the outdoor unit operation switch from "OFF" to "LOCAL" or "REMOTE". 3. Contact our service department for details about the setting procedures for the AIRNET and service checker, and the precautions for use When using the AIRNET: Specify the outdoor unit AirNet address settings (Setting Mode 2-06). Specify the virtual indoor unit address settings (Setting Mode 2-16). (The settings described above are necessary even if you are not using the AIRNET, but are using an ST controller.) (Contact our service department when connecting a system to a VRV or other systems.) 3-2. When using a service checker: Specify the virtual indoor address settings (Setting Mode 2-16). Note: Be sure to stop the system operation (compressors) before running a test of the AIRNET or using a service checker. Air Cooled Refrigeration Condensing Unit 75

77 Troubleshooting SiENBE List of Malfunction Codes No Item STD compressor OC activation Earth leakage Abnormal high pressure level Abnormal low pressure level INV compressor lock Outdoor fan motor malfunction Electronic expansion valve malfunction Abnormal discharge pipe temperature 3-sensor malfunction High pressure switch failure INV malfunction Radiating fin temperature rise INV compressor instantaneo us overcurrent INV compressor overcurrent Faulty INV compressor startup failure Transmission failure between control PCB and inverter PCB INV compressor power voltage imbalance Radiation fin thermistor Reversed phase / Open phase INV compressor abnormal power voltage Code (Remote control display) E0 E2 E3 E4 E5 E7 E9 F3 H0 H3 L1 L4 L5 L8 L9 LC P1 P4 U1 U2 Detection device Current sensor Leakage breaker Leakage detector PCB High pressure switch High pressure sensor Low pressure sensor Inverter PCB Fan driver PCB Main PCB Discharge pipe thermistor Outdoor air thermistor Suction pipe thermistor Discharge pipe thermistor Heat exchanger intermediate inlet thermistor Heat exchanger intermediate outlet thermistor High pressure sensor Low pressure sensor Main PCB Inverter PCB Inverter PCB Inverter PCB Inverter PCB Inverter PCB Inverter PCB Inverter PCB Inverter PCB Main PCB Inverter PCB Criteria Times of retry Level LRMEQ5, 6AY1 LRLEQ5, 6AY1 Malfunction output Output during backup LRMEQ8, 10, 12AY1 LRLEQ8, 10, 12AY1 Level Malfunction output Output during backup Level LRMEQ15, 20AY1 LRLEQ15, 20AY1 Malfunction output 14.95A 2 Alarm ON Alarm ON Output during backup Earth leakage breaker activates within 20 seconds after compressor startup 0 Shutdown ON Alarm ON Alarm ON Leakage detector PCB is activated when HP<3.6MPa 3.8MPa or more 0 Shutdown ON Alarm ON Alarm ON 3.55MPa or more SW5 is OFF 0MPa or less (MT) MPa or less (LT) 3 Shutdown ON Alarm ON Alarm ON 5 Shutdown ON Alarm ON 7 Shutdown ON 4 Shutdown ON Shutdown ON Shutdown ON Position signal error 4 Shutdown ON Alarm ON Alarm ON Irregular fan motor revolution No continuity of electronic expansion valve coil Discharge pipe temp. >150 C Discharge pipe temp. >120 C continuously for 70 sec. or more Discharge pipe temp. >125 C continuously for 30 sec. or more Discharge pipe temp.>130 C Discharge pipe temp. >110 C, and EV2_pls 450 pls, and EV3_pls 450 pls continuously for 60 sec. When 3 or more sensors detect abnormality No continuity of high pressure switch Malfunction of IGBT or INV is defected four times in an hour 4 Shutdown ON Alarm ON Alarm ON 0 Shutdown ON Shutdown ON Shutdown ON 0 Shutdown ON Alarm ON Alarm ON 14 Shutdown ON Alarm ON Alarm ON 3 Shutdown ON Alarm ON Alarm ON 5 Shutdown ON Alarm ON 7 Shutdown ON 0 Shutdown ON Shutdown ON Shutdown ON 0 Shutdown ON Shutdown ON Shutdown ON 0 Shutdown ON Shutdown ON Shutdown ON 94 C 9 Shutdown ON Alarm ON Alarm ON 9 Shutdown ON Alarm ON Alarm ON 16.1A or more 9 Shutdown ON Alarm ON Alarm ON Transmission failure between main PCB and inverter PCB Fin thermistor open circuit or short circuit Reversed phase or open phase 2 Shutdown ON Alarm ON Alarm ON No limit Remarks Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" Refer to P.56 "(10) Low pressure protection control". Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" Manual reset "Reset the power supply" Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" Manual reset "Reset the power supply" Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" Alarm ON Alarm ON Alarm ON Automatic reset 9 Shutdown ON Alarm ON Alarm ON No limit Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" Alarm ON Alarm ON Alarm ON Automatic reset 0 Shutdown ON Shutdown ON Shutdown ON 9 Shutdown ON Alarm ON Alarm ON Manual reset "Reset the power supply" Manual reset "Reset the power supply" or "Turn the operation switch ON to OFF" 76 Air Cooled Refrigeration Condensing Unit

78 SiENBE Troubleshooting 6.3 Checking Malfunction Codes by LED Lamps on PCB 1) Simple diagnosis by the LED error display In Setting Mode 1-11, the error status of each component can be checked by reading the blinking LED. [Steps] Operate the pushbuttons on the PCB (in Setting Mode 1) and malfunction codes will be displayed by LEDs. Follow the steps below to check your unit. 1. Press the MODE button (BS1). (Setting Mode 1 will be entered.) 2. Pressing the SET button (BS2) will go to item No.1 (see the list of output items). 3. Pressing the RETURN button (BS3) will display any error for item No.1 using the LED (Normal: OFF, Error: Blinking). 4. Pressing the MODE button (BS1) will go back to the initial state. Air Cooled Refrigeration Condensing Unit 77

79 Troubleshooting SiENBE ) In Setting Modes 1-14 and on, it is possible to use the LED to check the error and retry details, using the same steps as previously described (see the next page). BS1 BS2 BS3 BS4 BS5 MODE SET RETURN TEST RESET Setting Large item Middle item Small item Description 1 Setting Mode 1, No. 1 Reversed phase H7P blinks when reversed phase is detected. 2 Setting Mode 1, No. 1 INV earth leakage H6P blinks when INV earth leakage is detected. System 3 Setting Mode 1, No. 1 STD1 earth leakage H5P blinks when STD1 earth leakage is detected. 4 Setting Mode 1, No. 1 STD2 earth leakage H4P blinks when STD2 earth leakage is detected. 5 Setting Mode 1, No. 2 EV1 H7P blinks when EV1 error occurs. 6 Setting Mode 1, No. 2 EV EV2 H6P blinks when EV2 error occurs. 7 Setting Mode 1, No. 2 EV3 H5P blinks when EV3 error occurs. 8 Setting Mode 1, No. 3 HP H5P blinks when HP sensor error occurs. Pressure sensor 9 Setting Mode 1, No. 3 LP1 H7P blinks when LP1 sensor error occurs. 10 Setting Mode 1, No. 4 Td1 H7P blinks when Td1 sensor error occurs. 11 Setting Mode 1, No. 4 Td2 H6P blinks when Td2 sensor error occurs. Temperature sensor 1 12 Setting Mode 1, No. 4 Td3 H5P blinks when Td3 sensor error occurs. 13 Setting Mode 1, No. 4 Ti1 H4P blinks when Ti1 sensor error occurs. 14 Setting Mode 1, No. 5 Ta H7P blinks when Ta sensor error occurs. 15 Setting Mode 1, No. 5 Temperature sensor 2 Tg H6P blinks when Tg sensor error occurs. 16 Setting Mode 1, No. 5 TL H5P blinks when TL sensor error occurs. 17 Setting Mode 1, No. 6 Malfunction CT1 H7P blinks when CT1 sensor error occurs. Current sensor 18 Setting Mode 1, No. 6 output CT2 H6P blinks when CT2 sensor error occurs. 19 Setting Mode 1, No. 7 HPS H7P blinks when HPS is detected. Protection device 20 Setting Mode 1, No. 7 HPSL H6P blinks when HPSL is detected. 21 Setting Mode 1, No. 8 Transmission INV H7P blinks when INV transmission error occurs. 22 Setting Mode 1, No. 9 L1 H7P blinks when L1 error occurs. 23 Setting Mode 1, No. 9 L4 H6P blinks when L4 error occurs. 24 Setting Mode 1, No. 9 INV error 1 L5 H5P blinks when L5 error occurs. 25 Setting Mode 1, No. 9 L8 H4P blinks when L8 error occurs. 26 Setting Mode 1, No. 9 L9 H3P blinks when L9 error occurs. 27 Setting Mode 1, No. 10 E5 H7P blinks when E5 error occurs. 28 Setting Mode 1, No. 10 U2 H6P blinks when U2 error occurs. INV error 2 29 Setting Mode 1, No. 10 P1 H5P blinks when P1 error occurs. 30 Setting Mode 1, No. 10 P2 H4P blinks when P2 error occurs. 31 Setting Mode 1, No. 11 E7 (FAN1) H7P blinks when E7 error occurs. 32 Setting Mode 1, No. 11 H7 (FAN1) H6P blinks when H7 error occurs. Malfunction of fan 33 Setting Mode 1, No. 11 E7 (FAN2) H7P blinks when E7 error occurs. 34 Setting Mode 1, No. 11 H7 (FAN2) H6P blinks when H7 error occurs. 35 Setting Mode 1, No Setting Mode 1, No Setting Mode 1, No. 16 Malfunction contents (latest) Malfunction contents (one before) Malfunction contents (two before) 38 Setting Mode 1, No. 17 Software number display 0~63 (6bit) 39 Setting Mode 1, No. 18 Malfunction output HP 0~63 (6bit) 40 Setting Mode 1, No. 19 Software version display 0~63 (6bit) 41 Setting Mode 1, No Setting Mode 1, No Setting Mode 1, No. 22 Retry description (latest) Retry description (one before) Retry description (two before) 0~63 (6bit) (See the list of malfunction codes.) 0~63 (6bit) (See the list of malfunction codes.) 0~63 (6bit) (See the list of malfunction codes.) 0~63 (6bit) (See the list of malfunction codes.) 0~63 (6bit) (See the list of malfunction codes.) 0~63 (6bit) (See the list of malfunction codes.) 78 Air Cooled Refrigeration Condensing Unit

80 SiENBE Troubleshooting 6.4 Checking Malfunction Codes of the Condensing Unit Operate the pushbuttons on the PCB and malfunction codes will be displayed by LEDs. Setting Modes: 1-14, 15, 16, 20, 21, 22 [Steps] 1. Make sure that the "H1P" LED is OFF. (If the LED is ON, press the MODE button (BS1) once.) 2. Press the MODE button (BS1) once to enter the "monitor mode". 3. Pressing the RETURN button (BS3) will display the first digit of a malfunction code by LED. 4. Pressing the SET button (BS2) will display the second digit of the malfunction code by LED. 5. Pressing the MODE button (BS1) will go back to the former state. BS1 BS2 BS3 BS4 BS5 MODE SET RETURN TEST RESET (Pressing the BS3 switch once) LED display (Pressing the BS2 switch once) H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P Remote controller display h h h h E0 Malfunction contents STD Compressor Motor Overcurrent/ Lock Page referred P.84 h h l h E2 Earth Leakage P.86 l h k h h l l l k h h h l l E3 Actuation of High Pressure Switch P.88 h l h h E4 Actuation of Low Pressure Sensor P.90 h l h l E5 Inverter Compressor Motor Lock P.92 h l l l E7 Malfunction of Outdoor Unit Fan Motor P.94 l h h l E9 Malfunction of Electronic Expansion Valve Coil l h k h l h l l k h h h l l F3 Abnormal Discharge Pipe Temperature P.99 P.97 h h h h H0 Three-sensor Malfunction P.101 l h k h l h h l k h h h l l H3 Malfunction Related to High Pressure Switch P.103 h l l l H7 Abnormal Outdoor Fan Motor Signal P.104 l h h l H9 Malfunction of Outdoor Air Thermistor P.106 h h l h J2 Current Sensor Malfunction P.107 l h k h l l h l k h h h l l J3 Malfunction of Discharge Pipe Thermistor P.108 h l h l J5 Malfunction of Suction Pipe Thermistor P.108 l h h h J8 l h h l J9 Malfunction of Heat Exchanger Intermediate Inlet Thermistor Malfunction of Heat Exchanger Intermediate Outlet Thermistor P.108 P.108 l h l h JA Malfunction of High Pressure Sensor P.110 l l h h JC Malfunction of Low Pressure Sensor P.112 h h h l L1 Faulty Inverter PCB P.114 l h k h l l l l k h h l h h L4 h l h l L5 Malfunction of Inverter Radiating Fin Temperature Rise INV Compressor Instantaneous Overcurrent P.115 P.116 l h h h L8 INV Compressor Overload P.118 l h h l L9 Faulty INV Compressor Startup P.120 l h k l h h h l k h l l h h LC Malfunction of Transmission (between Inverter PCB and Main PCB) P.122 h h h l P1 Power Supply Voltage Imbalance P.124 h l h h P4 Faulty Radiation Fin Thermistor P.125 l h k l h h h l k h l l h l PJ Faulty of Capacity Setting l h k l h h l l k h h h h l U1 Reverse Phase / Open Phase P.126 h h l h U2 Abnormal Power Supply Voltage P.127 Air Cooled Refrigeration Condensing Unit 79

81 Troubleshooting SiENBE Troubleshooting by RAM Monitor Using the RAM monitor makes it possible to check the following operating data. Use this monitor for troubleshooting. SP_No. Ver. Hp_code SP number Version of software (Used for updating the software for PCB) The comparison between HP_code and the model on the RAM Monitor screen is as follows. 1:5AY1, 2:6AY1, 3:8AY1, 4:10AY1, 5:12AY1, 6:15AY1, 7:20AY1 [Main] Operation_SW unit_driving OPERATION switch bits (OFF/ON:0/1) No need for checking because it is not used. [Mode] Mode Next_mode Before_mode Mode_complete Start_complete Present mode of operation The following mode of operation The previous mode of operation Driving mode completion bits (OFF/ON:0/1) Start driving completion bits (OFF/ON:0/1) 80 Air Cooled Refrigeration Condensing Unit

82 SiENBE Troubleshooting [Sensor] Mark on RAM Monitor Mark of paragraph of trouble repair Mark of electric wiring diagram chart Meaning Ta Ta R1T Ambient temperature thermistor Td1 Td1 R31T Discharge temperature thermistor (INV Comp) Td2 Td2 R32T Discharge temperature thermistor (STD1) Td3 Td3 R33T Discharge temperature thermistor (STD2) Ti Ti R2T Suction temperature thermistor Tce Tce R3T Outdoor heat exchanger outlet thermistor Tg1 Tg R5T Subcool heat exchanger outlet thermistor TL TL R6T Subcool heat exchanger inlet thermistor HP HP S1NPH High pressure sensor LP LP S1NPL Low pressure sensor CT1 A6P Current sensor (STD1) CT2 A7P Current sensor (STD2) Tcl Tcg Teg Liquid side condensation pressure equivalent saturation temperature (calculation value) Gas side condensation pressure equivalent saturation temperature (calculation value) Gas side evaporation pressure equivalent saturation temperature (calculation value) [Actuator] Mark on RAM Monitor Mark of paragraph of trouble repair Mark of electric wiring diagram chart Meaning 52ci INV M1C INV compressor driven bits(off/on:0/1) 52C1_[X5A] STD1 M2C STD1 compressor driven bits(off/on:0/1) 52C2_[X6A] STD2 M3C STD2 compressor driven bits (OFF/ON:0/1) 20S1_[X9A] 4 WAY VALVE Y3S Solenoid valve (4 way valve ) bits (OFF/ON:0/1) SV2_[X8A] SV2 Y2S Solenoid valve (STD1) bits(off/on:0/1) SV3_[X15A] SV3 Y5S Solenoid valve(std2) bits (OFF/ON:0/1) EV1 EV1 Y1E Electric expansion valve(main) pulse(0~480) EV2 EV2 Y2E Electric expansion valve(economizer) pulse(0~480) EV3 EV3 Y3E Electric expansion valve(inv) pulse(0~480) Ftc INV step INV_Hz INV Hz Fansp Fan step Fan1 M1F Fan rotation Fan2 M2F Fan rotation TotalHz R1 OPERATING OUTPUT Total compressor Hz(STD is calculated as 166Hz) Operating output(for liquid solenoid valve control of showcase) bits (OFF/ON:0/1) Air Cooled Refrigeration Condensing Unit 81

83 Troubleshooting SiENBE [Data] Mark on RAM Monitor SH TdSH1 TdSH2 TdSH3 Lpm Lpm1 ΔTm_ho Meaning (Calculation value from sensor) Suction super heat Discharge super heat(inv) Discharge super heat(std1) Discharge super heat(std1) Target evaporation temperature equivalent pressure (Lpm is saturation temperature equivalent pressure of Tst. Tst=f(Lpm)=Tsd+ΔTsp+ΔTsn=f(Lpm1)+f(ΔTm)+ΔTsn Target evaporation temperature equivalent pressure (Lpm1 is saturation temperature equivalent pressure of Tsd.) ΔTm is an equivalent saturation pressure value of ΔTsp. [Amp/Fin] Mark on RAM Monitor Inv_1_Amp Inv_2_Amp Fin_Temp Fan1_1_Amp Fan1_2_Amp Fan2_1_Amp Fan2_2_Amp The first inverter current The second inverter current Temperature of INV fin The first fan1 current The second fan1 current The first fan2 current The second fan2 current Meaning [Irregular stop] Mark on RAM Monitor Irregular stop Inv_Abnomal_fixation STD1_Abnomal_fixation STD2_Abnomal_fixation FAN1_Abnomal_fixation FAN2_Abnomal_fixation Meaning Irregular stop bits (Normality/abnormality:0/1) Inverter compressor abnormality and fixation bits(normality/abnormality:0/1) STD1 compressor abnormality and fixation bits(normality/abnormality:0/1) STD2 compressor abnormality and fixation bits(normality/abnormality:0/1) FAN1 compressor abnormality and fixation bits(normality/abnormality:0/1) FAN2 compressor abnormality and fixation bits(normality/abnormality:0/1) 82 Air Cooled Refrigeration Condensing Unit

84 SiENBE Troubleshooting [Retry] Mark on RAM Monitor Error code Meaning F0 F1 F2 F3 F3 F3 Frequency of retrying of Abnormal Discharge Temperature(system) Frequency of retrying of Abnormal Discharge Temperature(INV) Frequency of retrying of Abnormal Discharge Temperature(STD1) F3 F3 Frequency of retrying of Abnormal Discharge Temperature(STD2) F4 E3 Frequency of retrying of Actuation of High Pressure Sensor F5 E4 Frequency of retrying of Actuation of High Pressure Sensor F6 E6 Frequency of retrying of Actuation of High HPSL F7 E0 Frequency of retrying of STD1 Compressor Motor Overcurrent/Lock F8 E0 Frequency of retrying of STD2 Compressor Motor Overcurrent/Lock F9 E5 Frequency of retrying of Inverter Compressor Motor Lock F10 L9 Frequency of retrying of Faulty INV Compressor Startup F11 L8 Frequency of retrying of Inverter Compressor Overload F12 L5 Frequency of retrying of Inverter Compressor instantaneous Overcurrent F13 U2 Frequency of retrying of Abnormal Power Supply Voltage F14 L4 Frequency of retrying of Malfunction of Inverter Radiating Fin Temperature Rise F17 P1 Frequency of retrying of Power Supply Voltage Imbalance F21 E7 Frequency of retrying of Malfunction of Outdoor Unit Fan1 Motor F22 H7 Frequency of retrying of Abnormal Outdoor Unit Fan1 Motor Signal F24 E7 Frequency of retrying of Malfunction of Outdoor Unit Fan2 Motor F25 H7 Frequency of retrying of Abnormal Outdoor Unit Fan2 Motor Signal [Abnormal_code] Mark on RAM Monitor Abnormal_code Meaning It depends on the table below Abnormal code on service manual [State] Display on Ram monitor screen Abnormal code on service manual Display on Ram monitor screen Abnormal code on service manual Display on Ram monitor screen E0 30 H3 43 L1 71 E1 31 H7 47 L4 74 E2 32 H9 49 L5 75 E3 33 J2 62 L8 78 E4 34 J3 63 L9 79 E5 35 J5 65 LC 7C E7 37 J8 68 P1 81 E9 39 J9 69 P4 84 F3 53 JA 6A PJ 8D H0 40 JC 6C U1 91 U2 92 Mark on RAM Monitor State1 State2 Meaning Normal when 5 or 9 is display Normal when 17 is display Ignore the number since it is not clear which number will be displayed Air Cooled Refrigeration Condensing Unit 83

85 Troubleshooting SiENBE Flow Chart for Troubleshooting E0 STD Compressor Motor Overcurrent/Lock Remote Controller Display E0 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ8~20AY1 LRLEQ8~20AY1 Detects the overcurrent with current sensor (CT). Malfunction is decided when the detected current value exceeds 14.95A for 2 seconds. Closed stop value Obstacles at the air outlet Improper power voltage Faulty magnetic switch Faulty compressor Faulty current sensor (A6P, A7P) Defect of outdoor unit PCB (A1P) 84 Air Cooled Refrigeration Condensing Unit

86 SiENBE Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the stop valve open? Obstacle exists around the air outlet. Is the power supply voltage normal? Open the stop valve. Remove the obstacle. Correct the power voltage. Is the magnetic switch (K2M, K3M) normal? ( 1) Check the wiring from power supply ~ current sensor (A6P, A7P) ~ MgS (K2M, K3M) ~ compressor Replace the magnetic switch. Is above wiring correct? Is current sensor correct? 1 Correct wiring. Replace the corresponding current sensor (A6P or A7P). Retry Replace the outdoor unit PCB (A1P). Replace the compressor. Note: 1 One of the possible factors may be chattering due to rough MgS contact. 2 Abnormal case The current sensor value is 0 during STD compressor operation. The current sensor value is more than 14.95A during STD compressor stop. Air Cooled Refrigeration Condensing Unit 85

87 Troubleshooting SiENBE E2 Earth Leakage Remote Controller Display E2 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 When there is a earth leakage (breaker ON/OFF) Time elapsed after power-on When there is a earth leakage (leakage detector PCB) The continuity of the high pressure switch is checked using the protective device circuit. When there is a earth leakage (breaker ON/OFF) Within 10 seconds after the power is turned on When there is a earth leakage (leakage detector PCB) If the high-pressure switch is activated but the pressure is not very high Compressor (or the complete product) has defective insulation. High pressure switch connection failure Faulty leakage detector PCB No continuity in high pressure switch Temporary liquid return or refrigerant slugging Power failure during operation Prolonged power shut down Within 10 seconds after the power is turned on 86 Air Cooled Refrigeration Condensing Unit

88 SiENBE Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. More than 10 seconds passed since power-on Reset the power with the operation switch set to OFF. Earth leakage (breaker ON/ OFF): E2 Shut off power. Remove the compressor lead wire. No defective insulation on compressor Replace the defective parts. Earth leakage (leakage detector PCB): E2 No defective insulation on entire product Replace the defective parts. Earth leakage (leakage detector PCB): E2 High pressure switch is properly connected. Correct connection. Leakage detector PCB fuse is not blown. Replace the leakage detector PCB. Recover all wiring. Turn on the power. Leakage detector PCB is energized. Replace the leakage detector PCB. High pressure switch is energized at both ends. Replace the high pressure switch. It is likely that earth leakage occurred due to temporary liquid return or refrigerant slugging. Earth leakage is possible in the event of power failure during operation or prolonged power shutoff. Air Cooled Refrigeration Condensing Unit 87

89 Troubleshooting SiENBE E3 Actuation of High Pressure Switch Remote Controller Display E3 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 The protection device circuit checks continuity in the high pressure switch. Error is generated when the HPS activation count reaches the number specific to the operation mode. (Reference) Operating pressure of high pressure switch Operating pressure: 3.8MPa Reset pressure: 2.85MPa Actuation of outdoor unit high pressure switch Defect of high pressure switch Defect of outdoor unit main PCB (A1P) Instantaneous power failure Faulty high pressure sensor 88 Air Cooled Refrigeration Condensing Unit

90 SiENBE Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Check for the points shown below. (1)Is the stop valve open? (2)Is the HPS connector properly connected to the main PCB? (3)Does the high pressure switch have continuity? Are the three points above OK? Rectify the defective points, if any. (1)Mount a pressure gauge on the high pressure service port. (2)Reset the operation with power breaker or operation switch and then restart the operation. Does the stop due to malfunction (E3) recur? Is the HPS operating value normal (i.e., 3.8MPa)? Replace the HPS. Are the characteristics of the high pressure sensor normal? (See 1.) Replace the high pressure sensor. Service Checker Connect the service checker to compare the high pressure value and the actual measurement value by pressure sensor (Refer to 1) by using the service checker. Check if the high pressure value and the actual measurement value by pressure sensor are the same. Replace the main PCB (A1P). The high pressure sensor is normal, and the pressure detected with the PCB is also normal. The high pressure has really become high. Referring to information on P134, remove the causes by CHECK 5 which the high pressure has become high. 1:Make a comparison between the voltage of the pressure sensor and that read by the pressure gauge. 2:Make measurement of voltage of the pressure sensor. +5V Connector for high pressure sensor (Red) (4) Red Micro-controller A/D input (3) (2) (1) Black White High pressure sensor Make measurement of DC voltage between these wires. Air Cooled Refrigeration Condensing Unit 89

91 Troubleshooting SiENBE E4 Actuation of Low Pressure Sensor Remote Controller Display E4 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 Abnormality is detected by the pressure value with the low pressure sensor. Error is generated when the low pressure is dropped under compressor operation. Low pressure <0.00MPa Detected within 3 hours after power-on Abnormal drop of low pressure Defect of low pressure sensor Defect of outdoor unit PCB Stop valve is not opened Shortage of gas Moisture choke 90 Air Cooled Refrigeration Condensing Unit

92 SiENBE Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the stop valve open? Open the stop valve. (1)Mount a pressure gauge on the low pressure service port. (2)Reset the operation and then restart the operation. Are the characteristics of the low pressure sensor normal? (See 1.) Replace the low pressure sensor. Service Checker Connect the service checker to compare the low pressure value and the actual measurement value by pressure sensor (Refer to 1) by using the service checker. Check if the low pressure value and the actual measurement value by pressure sensor are the same. The low pressure sensor is normal, and the pressure detected with the PCB is also normal. The low pressure has really become low. Replace the main PCB (A1P). CHECK 6 Referring to information on P135, remove the causes by which the low pressure has become low. 1:Make a comparison between the voltage of the pressure sensor and that read by the pressure gauge. 2:Make measurement of voltage of the pressure sensor. +5V Connector for low pressure sensor (Blue) (4) Red Micro-controller A/D input (3) (2) Black White Low pressure sensor (1) Make measurement of DC voltage between these wires. Checking for clog To check for the presence of clog, measure the pipe temperatures at the locations before and after the check point. (1) Electronic expansion valve (2) Secondary equipment filter (3) Dryer (4) Outdoor unit filter Air Cooled Refrigeration Condensing Unit 91

93 Troubleshooting SiENBE E5 Inverter Compressor Motor Lock Remote Controller Display E5 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 Inverter PCB takes the position signal from UVW line connected between the inverter and compressor, and the malfunction is detected when any abnormality is observed in the phasecurrent waveform. This malfunction will be output when the inverter compressor motor does not start up even in forced startup mode. Inverter compressor lock High differential pressure (0.5MPa or more) Incorrect UVW wiring Faulty inverter PCB Stop valve is left in closed Slugging state of refrigerant Abrasion of sliding parts caused by wet operation due to faulty secondary equipment expansion valve Failure of oil return due to faulty onsite piping work Liquid return caused by operation signal connection failure 92 Air Cooled Refrigeration Condensing Unit

94 SiENBE Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Check if the stop valve is open. Local factor Open the stop valve. Check if the relay wires to the compressor are correct. Replace the connecting wires and ensure right connection of the connector. Power OFF Check if the connection of UVW phase order is correct. Check if the wiring is the same as in the electric wiring diagram. Check if the wiring has any error in mistake for inverter compressor. Ensure correct connection. W U V Ensure correct connection. The insulation resistance of the compressor is low (not more than 100kΩ). Replace the compressor. The compressor coil has disconnection of wires. Restart and check the operation. Check if the condition occurs again. Conclude the work There is a possibility of defect of pressure equalizing. Check the refrigerant circuit. Power ON Check if the start mode is in the high differential pressure (not less than 0.5 MPa). Defect of pressure equalizing Check the refrigerant circuit. Replace the INV compressor. 1: Pressure difference between high pressure and low pressure before starting. Air Cooled Refrigeration Condensing Unit 93

95 Troubleshooting SiENBE E7 Malfunction of Outdoor Unit Fan Motor Remote Controller Display E7 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 While the fan motor is in operation, detect the malfunction related to the fan motor according to revolutions detected with the hall sensor IC. The fan revolutions are kept at less than a certain value for a period of not less than 6 seconds when the fan motor meets rotating conditions. The revolutions detection connector is disconnected. When the malfunction occurs 4 times, an alarm will be output. When it occurs 5 times, the system will go down. Failure of fan motor Defect or connection error of the connectors / harness between the fan motor and PCB The fan can not rotate due to any foreign substances entangled Clear condition: Continue normal operation for 10 minutes 94 Air Cooled Refrigeration Condensing Unit

96 SiENBE Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. LRL(M)EQ15A, 20AY1 have 2 fans. Cut the power supply OFF and wait for 10 minutes. Check if any foreign substances around the fan. Remove the foreign substances. Check connectors for their connections For fan motor 1: Relay connectors X1A and X2A or connectors of compressor inverter PCB X1A and X2A For fan motor 2: Relay connectors X3A and X4A or connectors of fan inverter PCB X1A and X2A Check if any connector is disconnected. Insert the connector. Check the relay connectors for their color For fan motor 1: White for all power supply and signal cables For fan motor 2: Red on the PCB side and white on the motor side for all power supply and signal cables Relay connectors have any connection error. A Correct the connection of the relay connectors. LRMEQ05~12AY1 LRLEQ05~12AY1 A4P P1 N1 X5A F1U R10 X3A + - X4A V1R X2A X1A Z5C N=1 X1A RED WHT BLK MS 3~ M1F 5 5 X2A LRMEQ15, 20AY1 LRLEQ15, 20AY1 A4P P1 P2 N1 N2 X5A X51A F1U R10 X3A + - X4A V1R X2A X1A Z5C N=1 X1A RED WHT BLK MS 3~ M1F 5 5 A8P X5A X3A X1A Z9C N=1 RED X2A X3A WHT RED P1 N1 F1U R X4A V1R X2A RED WHT BLK MS 3~ M2F 5 5 RED X4A WHT Air Cooled Refrigeration Condensing Unit 95

97 Troubleshooting SiENBE Troubleshooting A No continuity of fuse (FIU) on the fan inverter PCB. Replace fan inverter PCB. Unable to rotate the fan manually with ease when removing the connector of the fan motor. Replace the corresponding fan motor. Resistance value between the power supply wire terminal of fan motor and the motor frame (metal) is 1MΩ and below. Replace the corresponding fan motor. Check fan motor connector (power supply wire) The resistance value between UVW phases of fan motor is out of balance, or short circuit between UVW phases. Replace the corresponding fan motor. Check fan motor connector (signal wire) The signal wire short circuits between Vcc and GND and between UVW and GND. Replace the corresponding fan motor. Put the power supply ON to check the following LED lamps. 1) HAP lamp on the compressor PCB (A3P) 2) HAP lamp on the fan inverter PCB (A4P) HAP lamp for the A4P does not blink on the condition that HAP lamp for A3P is blinking. Replace the fan inverter PCB. Replace the fan motor Air Cooled Refrigeration Condensing Unit

98 SiENBE Troubleshooting E9 Malfunction of Electronic Expansion Valve Coil Remote Controller Display E9 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 To be detected based on continuity existence of coil of electronic expansion valve (Y1E) No current is detected in the common (COM [+]) when power supply is ON. Disconnection of connectors for electronic expansion valve (Y1E, Y2E, Y3E) Defect of electronic expansion valve coil Defect of outdoor unit main PCB (A1P) Air Cooled Refrigeration Condensing Unit 97

99 Troubleshooting SiENBE Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Turn power supply off, and turn power supply on again. Return to normal? External factor other than malfunction (for example, noise etc.). The connector of outdoor unit PCB (A1P) for electronic expansion valve is connected. Ensure correct connection. The coil resistance of electronic expansion valve is normal. (Refer to 1) Replace the electronic expansion valve coil. Replace outdoor unit PCB (A1P). Make measurement of resistance between the connector pins, and then make sure the resistance falls in the range of 40 to 50Ω. (Orange) 1 (Red) 2 (Yellow) 3 (Black) 4 5 COM[+] (Gray) 6 Measuring points Judgment criteria 40~50Ω 98 Air Cooled Refrigeration Condensing Unit

100 SiENBE Troubleshooting F3 Abnormal Discharge Pipe Temperature Remote Controller Display F3 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions LRMEQ5~20AY1 LRLEQ5~20AY1 Abnormality is detected according to the temperature detected by the discharge pipe temperature sensor. When the discharge pipe temperature rises to an abnormally high level. or Discharge pipe temp. >120 C continuously for 70 sec. or more Discharge pipe temp. >125 C continuously for 30 sec. or more Discharge pipe temp. >130 C & Discharge pipe temp. >110 C EV2 pls 450 pls EV3 pls 450 pls continuously for 60 sec. Supposed Causes Faulty discharge pipe temperature sensor Faulty discharge pipe temperature thermistor Faulty outdoor unit PCB Insufficient injection at intermediate heat exchanger outlet caused by flash gas due to gas leakage or insufficient volume of refrigerant. Clogging of electronic expansion valve for injection Failure to open the maintenance valve Insufficient insulation of onsite suction pipe Air Cooled Refrigeration Condensing Unit 99

101 Troubleshooting SiENBE Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Connect the service checker. Press reset and start operation again. Is the refrigerant amount proper? Recover the refrigerant. Conduct vacuum drying, and then charge a proper amount of refrigerant. Check the refrigerant piping line for clogging. Rectify the clogging. Connect the service checker, and the restart the system. Check if discharge pipe thermistor property is normal. ( 1) Replace the discharge pipe thermistor. Service Checker Connect the service checker to compare the temperature of discharge pipe by using service checker with actual measurement value of discharge pipe thermistor (Refer to 1). Check if temperature of discharge pipe by using service checker is the same with actual measurement value of discharge pipe thermistor. Replace the main PCB (A1P). Discharge pipe thermistor is normal and the temperature detection of the main PCB is also normal. Actually the temperature of discharge pipe is high. Check 3 Remove the factor of overheat operation referring to P132. 1: Compare the resistance value of discharge pipe thermistor and the value based on the surface thermometer. (Refer to P106 for the temperature and resistance characteristics of thermistor) 100 Air Cooled Refrigeration Condensing Unit

102 SiENBE Troubleshooting H0 Three-sensor Malfunction Remote Controller Display H0 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 Malfunction is detected from the values detected by pressure sensors and temperature sensors (thermistors). Three or more out of the pressure sensors and the temperature sensors (thermistors) causes a "Sensor malfunction", respectively. Faulty connection of sensor Faulty outdoor unit PCB Air Cooled Refrigeration Condensing Unit 101

103 Troubleshooting SiENBE Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. *Three or more sensors malfunction. Check for the malfunction history (malfunction code) on the remote controller to identify three or more malfunctioning sensors. (See*1) Check the malfunctioning sensor identified for their connector connection. Is the resistance normal? (*1) Properly connect it. Troubleshoot according to the malfunction code of each malfunction sensor. (See the flowchart corresponding to each malfunction code.) Is the resistance normal? Replace the relevant sensor. Replace the outdoor unit PCB (control PCB). *1.List of relevant malfunction codes and connectors Malfunction code Relevant thermistor LRMEQ5, 6AY1 LRLEQ5, 6AY1 Electrical Connector symbol LRMEQ8, 10, 12AY1 LRLEQ8, 10, 12AY1 Electrical symbol Connector LRMEQ15, 20AY1 LRLEQ15, 20AY1 Electrical symbol Connector H9 Outdoor air thermistor R1T X18A R1T X18A R1T X18A J3 Discharge pipe (M1C) thermistor Discharge pipe (M2C) thermistor Discharge pipe (M3C) thermistor R31T X29A R31T R31T X29A R32T R32T R33T J5 Suction pipe thermistor R2T R2T R2T Heat exchanger outlet J8 R5T thermistor X30A R5T X30A R5T X29A X30A Heat exchanger inlet J9 R6T R6T R6T thermistor JA High pressure sensor S1NPH X32A S1NPH X32A S1NPH X32A JC Low pressure sensor S1NPL X31A S1NPL X31A S1NPL X31A 102 Air Cooled Refrigeration Condensing Unit

104 SiENBE Troubleshooting H3 Malfunction Related to High Pressure Switch Remote Controller Display H3 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 Detect continuity in the high pressure switch in the protective device circuit. While the compressor stops running, there is no continuity in the high pressure switch. Faulty high pressure switch Broken wire in the harness of high pressure switch Faulty connection of the connector of high pressure switch Faulty outdoor unit PCB Broken wire in lead wire Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the high pressure switch connector properly connected to the outdoor unit PCB? (See*1) Properly connect it. Stop the compressor for a period of 10 minutes, and then carry out the following checks. Is there continuity in the high pressure switch? Replace the high pressure switch having no continuity in it. * Normal resistance: Not more than 10Ω Is there continuity in the lead wire? Replace the lead wire. Replace the outdoor PCB. *1 The table below shows the connector numbers of the high pressure switch. Model Relevant PCB Electric symbol Connector No. LRMEQ5, 6AY1 LRLEQ5, 6AY1 A1P S1PH X2A LRMEQ8, 10, 12AY1 LRLEQ8, 10, 12AY1 A1P S1PH S2PH X2A X3A LRMEQ15, 20AY1 LRLEQ15, 20AY1 A1P S1PH S2PH S3PH X2A X3A X4A Air Cooled Refrigeration Condensing Unit 103

105 Troubleshooting SiENBE H7 Abnormal Outdoor Fan Motor Signal Remote Controller Display H7 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 Detection of abnormal signal from fan motor. In case of detection of abnormal signal at starting fan motor. Abnormal fan motor signal (circuit malfunction) Broken, short or disconnection connector of fan motor connection cable Fan Inverter PCB malfunction (A4P or A8P) 104 Air Cooled Refrigeration Condensing Unit

106 SiENBE Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Cut the power supply off. Is the fan motor connector (X2A) properly connected to the fan inverter PCB? Ensure correct connection. Check the connector of the fan motor ( 1). Check if the resistance of the fan motor lead wire between Vcc and UVW and between GND and UVW are balanced. Replace the fan motor. Replace the inverter PCB. For fan motor 1: replace the inverter PCB (A4P). For fan motor 2: replace the inverter PCB (A8P). 1. Check procedure for fan motor connector (1) Power OFF the fan motor. (2) Remove the connector (X2A) on the PCB to measure the following resistance value. Judgement criteria: resistance value between each phase is within ±20% Connector for signal wires (X2A) X2A 5 Gray GND 4 Pink 3 Orange 2 Blue Vcc W V Measure the resistance between Vcc- UVW and GND-UVW. 1 Yellow U Air Cooled Refrigeration Condensing Unit 105

107 Troubleshooting SiENBE H9 Malfunction of Outdoor Air Thermistor Remote Controller Display H9 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 Malfunction is detected from the temperatures detected by the outdoor air thermistor. While in operation, the thermistor causes a broken wire or a short circuit in it. Faulty thermistor Faulty connection of connector Faulty outdoor unit PCB (control PCB) Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Check for connector connection. Is the resistance normal? Properly connect it. Disconnect the thermistor from the outdoor unit PCB, and then make resistance measurement using a multiple meter. Is the resistance normal? (*1) Replace the thermistor. Replace the outdoor unit PCB (control PCB). *1. For "temperature and resistance characteristics of thermistor", refer to the table shown below. Temp.( C) Resistance (kω) Temp.( C) Resistance (kω) Air Cooled Refrigeration Condensing Unit

108 SiENBE Troubleshooting J2 Current Sensor Malfunction Remote Controller Display J2 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 Malfunction is detected from the current value detected by current sensor. When the current value detected by current sensor becomes 5A or lower, or 40A or more during STD compressor operation. Faulty current sensor Faulty outdoor unit PCB Defective compressor Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the connector for current sensor connected to X25A, X26A on outdoor unit PCB (A1P)? Connect the connector, and operate unit again. Are the current sensors inversely connected to two STD compressors? Correct the connections between the current sensors and the STD compressors. Applicable compressor coil wire is broken. Replace the compressor. Is the current sensor mounted on the T-phase wire? Mount the current sensor correctly, and operate the unit again. Replace the current sensor. Retry Replace the outdoor unit PCB. (V3071) Air Cooled Refrigeration Condensing Unit 107

109 Troubleshooting SiENBE J3,J5,J8,J9 Faulty Thermistor Remote Controller Display J3,J5,J8,J9 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 Malfunction is detected from the temperatures detected by thermistors. While in operation, any of the thermistors causes a broken wire or a short circuit in it. Faulty connection of thermistor Faulty thermistor Faulty outdoor unit PCB 108 Air Cooled Refrigeration Condensing Unit

110 SiENBE Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the malfunction code "J3" displayed? There are multiple relevant thermistors. Identify the thermistor using the monitor mode of the outdoor unit PCB. Check for connector connection. (*1) Is the resistance normal? Properly connect it. Disconnect the thermistor from the outdoor unit PCB, and then make resistance measurement using a multiple meter. Is the resistance normal? (*2) Replace the thermistor. Replace the outdoor unit main PCB. *1. List of malfunction codes, description of malfunction, and electric symbols Malfunction code Relevant thermistor LRMEQ5, 6AY1 LRLEQ5, 6AY1 Electrical Connector symbol LRMEQ8, 10, 12AY1 LRLEQ8, 10, 12AY1 Electrical symbol Connector LRMEQ15, 20AY1 LRLEQ15, 20AY1 Electrical symbol Connector H9 Outdoor air thermistor R1T X18A R1T X18A R1T X18A Discharge pipe (M1C) thermistor R31T X29A R31T R31T X29A J3 Discharge pipe (M2C) thermistor R32T R32T Discharge pipe (M3C) thermistor R33T J5 Suction pipe thermistor R2T R2T R2T J8 Heat exchanger outlet thermistor R5T X30A R5T X30A R5T X29A X30A Heat exchanger inlet J9 R6T R6T R6T thermistor JA High pressure sensor S1NPH X32A S1NPH X32A S1NPH X32A JC Low pressure sensor S1NPL X31A S1NPL X31A S1NPL X31A *2. For "temperature and resistance characteristics of thermistor", refer to information on P.138. Air Cooled Refrigeration Condensing Unit 109

111 Troubleshooting SiENBE JA Malfunction of High Pressure Sensor Remote Controller Display JA Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 Malfunction is detected from the pressure detected by the high pressure sensor. When the high pressure sensor is short circuit or open circuit. (Not less than 4.3MPa, or 0.01MPa and below) Defect of high pressure sensor Connection of low pressure sensor with wrong connection Defect of outdoor unit PCB Defective connection of high pressure sensor 110 Air Cooled Refrigeration Condensing Unit

112 SiENBE Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. 1.Set the high pressure gauge. 2.Connect a RAM monitor. Are the characteristics of the high pressure sensor normal? (Make a comparison between the voltage characteristics ( 1) and the gauge pressure.) Replace the high pressure sensor. If the PCB pressure detection normal? (Make a comparison between the checker pressure data and the voltage characteristics ( 1).) Replace the main PCB. Reset the operation, and then restart the outdoor unit. Are the characteristics of the high pressure sensor normal? (*2) 1: Voltage measurement point Replace the high pressure sensor. Replace the main PCB. Outdoor unit PCB (A2P) +5V Connector (Red) X32A Micro-computer A/D input GND (4) (3) (2) (1) Red Black White High pressure sensor (S1NPH) 2 Measure DC voltage here. 2: Refer to Voltage Characteristics of Pressure Sensor table on P.139. (V2807) Air Cooled Refrigeration Condensing Unit 111

113 Troubleshooting SiENBE JC Malfunction of Low Pressure Sensor Remote Controller Display JC Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20PY1 LRLEQ5~20PY1 Malfunction is detected from pressure detected by low pressure sensor. When the low pressure sensor is short circuit or open circuit. (Not less than 1.8MPa, or -0.1MPa and below) Defect of low pressure sensor Connection of high pressure sensor with wrong connection Defect of outdoor unit PCB Defective connection of low pressure sensor Piping with wrong connection Reduction of low pressure when the thermistors (Ti, Tg) are defective. 112 Air Cooled Refrigeration Condensing Unit

114 SiENBE Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Piping for different circuit is erroneously connected. 1.Set the low pressure gauge. 2.Connect a RAM monitor. Correct the piping. Are the characteristics of the low pressure sensor normal? (Make a comparison between the voltage characteristics ( 1) and the gauge pressure.) Replace the low pressure sensor. If the PCB pressure detection normal? (Make a comparison between the checker pressure data and the voltage characteristics (*1).) Replace the main PCB. Reset the operation, and then restart the outdoor unit. Are the characteristics of the low pressure sensor normal?( 2) Replace the low pressure sensor. 1: Voltage measurement point Replace the main PCB. (V2808) Outdoor unit PCB (A2P) +5V Connector X31A GND Micro-computer A/D input (4) (3) (2) (1) Red Black White Low pressure sensor (S1NPL) 2 Measure voltage here. 2: Refer to Voltage Characteristics of Pressure Sensor table on P.139. Air Cooled Refrigeration Condensing Unit 113

115 Troubleshooting SiENBE L1 Faulty Inverter PCB Remote Controller Display L1 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 Malfunction is detected from the current values while waveform is outputted prior to the startup of compressor. Malfunction is detected from the values detected by the current sensor in synchronized operation at startup. An overcurrent (OCP) flows while waveform is outputted. The current sensor malfunctions while in synchronized operation. IGBT malfunctions. Faulty inverter PCB (A3P) Faulty IPM Faulty current sensor Faulty IGBT or drive circuit Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Turn OFF the power supply once, and then ON it again. Is the power supply normally reset? There are possible external causes (e.g. noises) other than failures. Replace the inverter PCB (A3P). 114 Air Cooled Refrigeration Condensing Unit

116 SiENBE Troubleshooting L4 Malfunction of Inverter Radiating Fin Temperature Rise Remote Controller Display L4 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 Fin temperature is detected by the thermistor of the radiation fin. When the temperature of the inverter radiation fin increases above 93 C. Actuation of fin thermal (Actuates above 93 C) Faulty inverter PCB Faulty radiating fin thermistor Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. The radiation fin temp. rises to over 87 C. Turn OFF the power supply, and then make measurement of resistance of the radiation fin thermistor. Faulty radiation of power unit Blocked air inlet Dirty radiation fin High outdoor temperature Is the resistance of the thermistor normal? Connect and disconnect the radiation fin thermistor connector (X111A) to properly connect it. Replace the thermistor. Turn ON the power supply to start operation, and then check whether the malfunction recurs. Replace the inverter PCB. (Reference) Reset temperatures LRMEQ5~20AY1, LRLEQ5~20AY1 Not more than 79 C for a period of one minute Continue the operation. The radiation fin temperature can have risen due to field factors. In this case, check for the following: Whether the radiation fin gets stained. Whether air flow is interrupted (due to dust or foreign matters) or the fan propeller gets damaged. Whether the outdoor air temperature is too high. Air Cooled Refrigeration Condensing Unit 115

117 Troubleshooting SiENBE L5 INV Compressor Instantaneous Overcurrent Remote Controller Display L5 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 Malfunction is detected from the currents flowing in the power transistor. An overcurrent (59.1A) flows even instantaneously. Faulty compressor coil (e.g. broken wire or insulation failure) Compressor startup failure (mechanical lock) Faulty inverter PCB Slugging of refrigerant Abrasion of sliding parts caused by wet operation due to faulty secondary equipment expansion valve Failure of oil return due to faulty on site piping work Liquid return caused by operation signal connection failure 116 Air Cooled Refrigeration Condensing Unit

118 SiENBE Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the stop valve open? Open the stop valve. Is the compressor lead wire normal? Replace the compressor lead wire. Are wirings and wire connections to the compressor normal? Correct the wirings and wire connections. Power OFF The insulation resistance of the compressor is not more than 100kΩ Replace the INV compressor. There is a broken wire in the compressor coil. Replace the INV compressor. Check4 (P.133) Is the power transistor normal? Replace the inverter PCB (A3P). When restarting, the fault recurs. Continue the operation. Factors such as instantaneous power failure are supposed. Power OFF Replace the inverter PCB (A3P). When restarting, the fault recurs. Continue the operation. Replace the INV compressor. Air Cooled Refrigeration Condensing Unit 117

119 Troubleshooting SiENBE L8 INV Compressor Overload Remote Controller Display L8 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 Malfunction is detected from the currents flowing in the power transistor. Currents on the secondary side of the inverter come to the following values. (1) Not less than 19A for a period of consecutive 5 seconds (2) Not less than 16.1A for a period of consecutive 260 seconds Compressor overload Broken wire in compressor coil Disconnection of compressor wiring Faulty inverter PCB Slugging of refrigerant Abrasion of sliding parts caused by wet operation due to faulty secondary equipment expansion valve Failure of oil return due to faulty on site piping work Liquid return caused by operation signal connection failure 118 Air Cooled Refrigeration Condensing Unit

120 SiENBE Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the stop valve open? Open the stop valve. Is the compressor lead wire normal? Replace the compressor lead wire. Are wirings and wire connections to the compressor normal? Correct the wirings and wire connections. Power OFF The insulation resistance of the compressor is not more than 100kΩ Replace the INV compressor. There is a broken wire in the compressor coil. Replace the INV compressor. Check4 (P.133) Is the power transistor normal? Replace the inverter PCB (A3P). Connect the compressor lead wire, and then restart operation. The malfunction "L8" recurs. Continue the operation. Is a difference between high pressure and low pressure prior to restarting not more than 0.2MPa? Faulty pressure equalization in the refrigerant circuit Check for compressor Air Cooled Refrigeration Condensing Unit 119

121 Troubleshooting SiENBE L9 Faulty INV Compressor Startup Remote Controller Display L9 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20AY1 LRLEQ5~20AY1 Malfunction is detected from the signal waveforms of the compressor. The compressor startup sequence is not complete. Failure to open the stop valve Faulty compressor Erroneous wire connections to compressor Large differential pressure prior to compressor startup Faulty inverter PCB Slugging of refrigerant Abrasion of sliding parts caused by wet operation due to faulty secondary equipment expansion valve Failure of oil return due to faulty onsite piping work Liquid return caused by operation signal connection failure Too frequent on/off operation due to insufficient loading 120 Air Cooled Refrigeration Condensing Unit

122 SiENBE Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the first time for the compressor to start after installation? Is a proper amount of refrigerant charged? Is the stop valve open? Charge a proper amount of refrigerant. Open the stop valve. Refrigerant is slugging. (No power is applied for a period of not less than 6 hours.) Eliminate the slugging of refrigerant. Is the insulation resistance of compressor maintained at not less than 100kΩ? Eliminate the slugging of refrigerant. Is the compressor lead wire disconnected? Refrigerant is slugging. (No power is applied for a period of not less than 6 hours.) Connect the compressor lead wire. Rectify, apply power, and then restart operation. Recheck for the compressor and the refrigerant circuit. Eliminate the slugging of refrigerant. Is the insulation resistance of compressor maintained at not less than 100kΩ? There is a broken wire in the compressor. Replace the INV compressor. Replace the INV compressor. Check4 (P.133) Is the power transistor normal? Replace the compressor INV PCB (A3P). Recheck the compressor and refrigerant system. Air Cooled Refrigeration Condensing Unit 121

123 Troubleshooting SiENBE LC Malfunction of Transmission (between Inverter PCB and Main PCB) Remote Controller Display LC Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20PY1 LRLEQ5~20PY1 Check the communication state between the inverter PCB and the control PCB by microcomputer. When the correct communication is not conducted in certain period. Faulty connection between the inverter PCB and the main PCB Faulty main PCB (transmission part) Faulty inverter PCB Faulty noise filter External factors (e.g. noises) Faulty INV compressor Faulty fan motor 122 Air Cooled Refrigeration Condensing Unit

124 SiENBE Troubleshooting Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Is the connector connecting between each control PCB and each inverter PCB securely connected? (See *1) Properly connect the connector. Is the type of the inverter PCB correct? (See *2) Replace with a proper PCB. The insulation resistance of the INV compressor is not more than 100kΩ. Replace the INV compressor. The insulation resistance of the fan motor is not more than 1MΩ. Replace the fan motor. The micro controller normal monitor LED (green) on the main PCB (A3P) is blinking. Not the "LC" malfunction. Recheck for the malfunction code. The micro controller normal monitor LED (green) on the inverter PCB is blinking. Replace the inverter PCB. The "LC" malfunction recurs. Replace the outdoor unit main PCB (A1P). Continue the operation. Factors such as instantaneous power failure are supposed. *1. Connect and disconnect the connector to make sure it is securely connected. *2. List of types of inverter PCB Applicable model Type LRMEQ5~20AY1 PC0509-2(A) LRLEQ5~20AY1 Air Cooled Refrigeration Condensing Unit 123

125 Troubleshooting SiENBE P1 Power Supply Voltage Imbalance Remote Controller Display P1 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20PY1 LRLEQ5~20PY1 Malfunction is detected from the voltage imbalance from the PCB. The power supply voltage causes an imbalance of not less than approx.14v? Continue operation without deciding the malfunction. Open phase Voltage imbalance between phases Faulty main circuit capacitor Faulty inverter PCB Faulty K2M Faulty main circuit wiring Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Imbalance in supplied voltage is in excess of 14 V (Y1). 1 Open phase? Open phase Normalize field cause. Fix power supply voltage imbalance. Is the voltage imbalance applied to the inverter in excess of 14 V (Y1)? 2 <When voltage monitoring is possible:> Using a device capable of constant recording of power supply voltage record power supply voltage between 3 phases (L1 ~ L2, L2 ~ L3, L3~L1) for about one continuous week. Part or wiring defect After turning the power supply OFF, check and repair the main circuit wiring or parts. (1) Loose or disconnected wiring between power supply and inverter (2) K2 contact disposition, fusion or contact is poor. (3) Loose or disconnected noise filter 1. Measure voltage at the X1M power supply terminal block. 2. Measure voltage at terminals RED, BLACK and WHITE wires of the diode module inside the inverter while the compressor is running. No abnormalities are observed in the power supply, but the imbalance in voltage recurs. Power supply voltage imbalance measure Replace the inverter PCB. Explanation for users In accordance with "notification of inspection results" accompanying spare parts. Give the user a copy of "notification of inspection results" and leave it up to him to improve the imbalance. Be sure to explain to the user that there is a "power supply imbalance" for which DAIKIN is not responsible. 124 Air Cooled Refrigeration Condensing Unit

126 SiENBE Troubleshooting P4 Faulty Radiation Fin Thermistor Remote Controller Display P4 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20PY1 LRLEQ5~20PY1 While the compressor stops running, detect the resistance of the radiation fin thermistor. The thermistor resistance comes to a value equivalent to an open or a short circuit. Faulty radiation fin thermistor Faulty inverter PCB Faulty INV compressor Faulty fan motor Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Make measurement of resistance of the radiation fin thermistor. Is the resistance of the thermistor normal? (See*1) Replace the inverter PCB. The insulation resistance of the INV compressor is not more than 100kΩ. Replace the INV compressor. The insulation resistance of the fan motor is not more than 1MΩ. Replace the fan motor. Does the fault recur when turning ON the power supply? Replace the inverter PCB. Continue the operation. *1. Refer to the characteristics of radiation fin thermistor (P.106). Air Cooled Refrigeration Condensing Unit 125

127 Troubleshooting SiENBE U1 Reverse Phase / Open Phase Remote Controller Display U1 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20PY1 LRLEQ5~20PY1 Make judgement by detecting the state of every phase in the reverse phase detection circuit. The power supply voltage has a reverse phase or the phase T is open. Reverse phase of power supply Open phase T of power supply Faulty outdoor unit PCB Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. The phase T is open at the power supply terminal block (X1M) of the outdoor unit. Rectify the open phase. Need to check for a field power supply unit. Changing power supply cable connections between phases enables normal operation. The power supply has a reverse phase. Change power supply cable connections Replace the outdoor unit main PCB. 126 Air Cooled Refrigeration Condensing Unit

128 SiENBE Troubleshooting U2 Abnormal Power Supply Voltage Remote Controller Display U2 Applicable Models Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes LRMEQ5~20PY1 LRLEQ5~20PY1 Malfunction is detected from the voltage of the main circuit capacitor in the inverter. When the voltage aforementioned is not less than 780V or not more than 320V, or when the current-limiting voltage does not reach 200V or more or exceeds 740V. Power supply voltage drop Instantaneous power failure Open phase Faulty inverter PCB Faulty control box PCB Faulty compressor Faulty wiring in the main circuit Faulty fan motor Faulty connection of signal cable Air Cooled Refrigeration Condensing Unit 127

129 Troubleshooting SiENBE Troubleshooting Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Power ON Power OFF Check for power supply voltage. Voltage between phases: 380 to 415V (Y1) Unbalanced power supply? (Not more than 2%: Phase voltage of not more than approx. 5V) Disconnect the cable from the compressor, and then check the compressor for the insulation resistance. Onsite causes. Make proper wire connections without open phase, erroneous connections, or erroneous order of phases. Onsite causes. Correct the unbalanced loads to eliminate the unbalanced state. Unbalanced voltage will cause extremely unbalanced current, thus impairing the service life of or resulting in the malfunction of the equipment. The insulation resistance is low. (i.e., not more than 100kΩ.) Disconnect the cable from the fan, and then check the fan motor for the insulation resistance. Replace the compressor. The insulation resistance is low (i.e., not more than 1MΩ.) Check the inverter power transistor. Replace the fan motor. Replace the fan driver. Has the power transistor got faulty? Check the fan driver power transistor. Has the power transistor got faulty? A Replace the inverter PCB. I Observe the conditions of the PCB. In the case of a serious failure, a compressor failure may cause the failure of the PCB. Even if the PCB is replaced, it may cause failure again. To avoid that, recheck the compressor for ground and for any broken wires. Furthermore, even after the completion of PCB replacement, check the compressor. Replace the fan driver PCB. I Observe the conditions of the PCB. 128 Air Cooled Refrigeration Condensing Unit

130 SiENBE Troubleshooting A Power OFF Check for connector connections: Remove and insert the connectors shown below. Furthermore, check the connectors for terminal conditions and continuity. RXQPAY1: X1M power receiving terminal X400A A2P A2P X401A X10A A3P A1P X28A X6A A3P A3P X61A X402A A2P A3P X1A X403A A2P A3P P1, P2 Reactor terminal L1R A3P P3, N3 P1, N1 A4P A4P P2, N2 P1, N1 A8P If any wiring has damage, replace the harness. Has the inverter PCB caused damage? A3P: Replace the inverter PCB. If the PCB replaced is badly damaged, the compressor is likely to get faulty. To make sure, recheck the compressor. Has the fan driver caused damage? A4P/A8P: Replace the fan driver PCB. If the PCB replaced is badly damaged, the fan motor is likely to get faulty. To make sure, recheck the compressor. Turn ON the power supply. Stop (standby) before the fan rotates. Recheck for the power supply. If there is no problem with the power supply, replace the A2P noise filter PCB. If the malfunction recurs, replace the inverter PCB. Power ON Stop (standby) when the compressor starts up. The U2 malfunction recurs. Recheck for the power supply. If there is no problem with the power supply, replace the A3P inverter PCB. If the PCB replaced is badly damaged, compressor is likely to get faulty. To make sure, recheck the compressor. Check the harness, and then replace it if necessary. End of measures: I The malfunction may temporarily result from onsite causes. Causes: Instantaneous power failure (open phase), noises, or else. Air Cooled Refrigeration Condensing Unit 129

131 Troubleshooting SiENBE [Check 1] Check for Causes of Rise in High Pressure Referring to the Fault Tree Analysis (FTA) shown below, identify faulty points. Rise in high pressure Partly rise in pressure [In cooling] If the indoor unit electronic expansion valve is throttled: Faulty high pressure control High piping resistance Faulty outdoor unit electronic expansion valve Abnormal if a temp. difference between inlet and outlet is over 10 C. Faulty control Faulty indoor unit electronic expansion valve Closed stop valve Bended or crushed pipe Visual check Clogged piping due to foreign matters Faulty valve coil Faulty valve body Faulty high pressure sensor Faulty outdoor unit main PCB Faulty valve coil Faulty valve body Check to be sure that the stop valve is open. Check for any temp. difference before and after filter or branch piping. Is the coil resistance and the insulation normal? (See [Check 10]) Are the voltage characteristics normal? Is the pressure value on the Service Checker matched to the measurement of sensor? Is the coil resistance and the insulation normal? (See [Check 10]) [In frosting] If the outdoor unit electronic expansion valve is excessively throttled: Faulty control Faulty high pressure sensor Faulty indoor unit liquid pipe thermistor Are the voltage characteristics normal? Is the connector properly connected? Are the thermistor resistance characteristics normal? Faulty outdoor unit main PCB Is the pressure value on the Service Checker matched to the measurement of sensor? Suction air temperature of the condenser too high Suction air temperature of the outdoor unit too high Short circuit High ambient temp. Is the suction temp. not more than 43 C? Is the outdoor temp. not more than 43 C? Degradation in condensing capacity Refrigerant overcharged Dirty condenser Mixing of noncondensing gas Drop in fan air volume Drop in fan output High air duct resistance Does the heat exchanger get clogged? Does air get mixed in the refrigerant circuit? Faulty fan motor Faulty outdoor unit main PCB (including capacity setting) Dirty filter Obstacles See [Check 6]. Can the fan motor be rotated by hand? Is the resistance and insulation of motor coil normal? Is the capacity setting of spare PCB correct, if used? Does the air filter get clogged? Is there any obstacle in the air duct? 130 Air Cooled Refrigeration Condensing Unit

132 SiENBE Troubleshooting [Check 2] Check for Causes of Drop in Low Pressure Referring to the Fault Tree Analysis (FTA) shown below, identify faulty points. Low pressure is too low. (Evaporating temp. is low) ( 1) Faulty low pressure control ( 2) [In cooling] If the indoor unit electronic expansion valve is excessively throttled: (See 3) Faulty compressor capacity control Faulty low pressure protection control Faulty indoor unit electronic expansion valve Faulty low pressure sensor Faulty outdoor unit main PCB Faulty low pressure sensor Faulty outdoor unit main PCB Faulty valve coil Faulty valve body Are the voltage characteristics normal? Is the pressure value on the Service Checker matched to the measurement of sensor? Are the voltage characteristics normal? Is the pressure value on the Service Checker matched to the measurement of sensor? Is the coil resistance and the insulation normal? Faulty electronic expansion valve control Faulty control Faulty outdoor unit electronic expansion valve Faulty indoor unit gas pipe thermistor Faulty indoor unit liquid pipe thermistor Faulty outdoor unit main PCB Faulty valve coil Faulty valve body Check for thermistor resistance and connector connection. Check for thermistor resistance and connector connection. Is the pressure value on the Service Checker matched to the measurement of sensor? Is the coil resistance and the insulation normal? [In defrosting] If the outdoor unit electronic expansion valve is excessively throttled: (See 4) Faulty control Faulty low pressure sensor Faulty suction pipe thermistor Faulty outdoor unit main PCB Are the voltage characteristics normal? Check for thermistor resistance and connector connection. Suction air temperature of the evaporator too low Suction air temperature of the indoor unit too low Short circuit Low ambient temp. Faulty indoor unit suction air thermistor Does the suction air temps. fall in the "continuous operation range of inside temperature"? Does the inside temps. fall in the "continuous operation range"? Is the connector properly connected? Are the thermistor resistance characteristics normal? Low refrigerant circulation rate High piping resistance Refrigerant shortage Moisture choke Abnormal piping length Bended or crushed pipe Clogged piping due to foreign matters Stop valve closed See [Check 6]. Remove moisture by vacuum drying. Does the piping length fall in the permissible range? Visual check Check for any temp. difference before and after filter or branch piping. Check to be sure that the stop valve is open. Degradation in evaporating capacity Dirty evaporator Drop in fan air volume Drop in fan output High air duct resistance Does the heat exchanger get clogged? Faulty fan motor Faulty outdoor unit main PCB (including capacity setting) Dirty filter Obstacles Can the fan motor be rotated by hand? Is the resistance and insulation of motor coil normal? Is the capacity setting of spare PCB correct, if used? Does the air filter get clogged? Is there any obstacle in the air duct? 1. For the compressor capacity control in cooling, refer to information in "Compressor Control". 2. "Low pressure protection control" includes low pressure drooping control. 3. The indoor unit electronic expansion valve exerts "superheated degree control" in cooling. 4. The outdoor unit electronic expansion valve (EV1) exerts "superheated degree control of outdoor unit heat exchanger" in defrosting. Air Cooled Refrigeration Condensing Unit 131

133 Troubleshooting SiENBE [Check 3] Check for Causes of Overheat Operation Referring to the Fault Tree Analysis (FTA) shown below, identify faulty points. Rise in discharge pipe temp. Faulty discharge pipe temp. control Faulty outdoor unit electronic expansion valve (EV3) (See 1) Faulty subcool electronic expansion valve Faulty control Faulty valve coil Faulty valve body Faulty low pressure sensor Faulty thermistor at subcool heat exchanger outlet Faulty outdoor unit main PCB Is the coil resistance and the insulation normal? Are the voltage characteristics normal? Is the connector properly connected? Are the thermistor resistance characteristics normal? Is the pressure value on the Service Checker matched to the measurement of sensor? Faulty fourway valve operation Four-way valve cut off halfway Are the temperatures of pipes connected to the four-way valve normal? Overheat of compressor Overheat due to damage shaft Overheat due to faulty compressor [In cooling] If the indoor unit electronic expansion valve is excessively throttled: (See 2) Faulty superheated degree control Faulty indoor unit electronic expansion valve Faulty control Faulty valve coil Faulty valve body Faulty indoor unit gas pipe thermistor Faulty indoor unit liquid pipe thermistor Faulty outdoor unit main PCB Is the coil resistance and the insulation normal? Is the connector properly connected? Are the thermistor resistance characteristics normal? Is the connector properly connected? Are the thermistor resistance characteristics normal? [In defrosting] If the outdoor unit electronic expansion valve is excessively throttled: (See 3) Refrigerant gas shortage Faulty outdoor unit electronic expansion valve Faulty control Faulty valve coil Faulty valve body Faulty low pressure sensor Faulty suction pipe thermistor Faulty outdoor unit main PCB Is the coil resistance and the insulation normal? Are the voltage characteristics normal? Is the connector properly connected? Are the thermistor resistance characteristics normal? Is the pressure value on the Service Checker matched to the measurement of sensor? See [Check 6]. Abnormal piping length Bended or crushed pipe Does the piping length fall in the permissible range? Visual check High piping resistance (Including moisture choke) Remove moisture by vacuum drying. Closed stop valve Check to be sure that the stop valve is open. 1. For subcool electronic expansion valve control, refer to information in "Electronic expansion valve control". 2. The indoor unit electronic expansion valve exerts "superheated degree control" in cooling. 3. The outdoor unit electronic expansion valve (EV1) exerts "superheated degree control" in defrosting. 4. Guideline for superheated degree by which a malfunction is judged as overheat operation (1) Suction gas superheated degree: Not less than 10 C / (2) Discharge gas superheated degree: Not less than 45 C; provided, however, that superheated degrees immediately after startup or for drooping control are excluded. (The values aforementioned are just a guideline. Even if the values fall within the range shown above, these values may be normal depending on other conditions.) 132 Air Cooled Refrigeration Condensing Unit

134 SiENBE Troubleshooting [Check 4] Check for Power Transistor <LRMEQ5~20AY1, LRLEQ5~20AY1> Checking failures in power semiconductors mounted on inverter PCB Check the power semiconductors mounted on the inverter PCB by the use of a multiple tester. <Items to be prepared> Multiple tester : Prepare the analog type of multiple tester. For the digital type of multiple tester, those with diode check function are available for the checking. <Test points> Turn OFF the power supply. Then, after a lapse of 10 minutes or more, make measurement of resistance. <Preparation> To make measurement, disconnect all connectors and terminals. Inverter PCB J1 J2 J3 P1 P3 N3 U V W Electronic circuit DM P1 P2 P3 IGBT X10A K2 L1 L2 L3 J1 J2 J3 N3 U V W X11A According to the checking aforementioned, it is probed that the malfunction results from the faulty inverter. The following section describes supposed causes of the faulty inverter. Faulty compressor (ground leakage) Faulty fan motor (ground leakage) Entry of conductive foreign particles Abnormal voltage (e.g. overvoltage, surge (thunder), or unbalanced voltage) In order to replace the faulty inverter, be sure to check for the points aforementioned. Air Cooled Refrigeration Condensing Unit 133

135 Troubleshooting SiENBE [Check 5] Check for Causes of Wet Operation Referring to the Fault Tree Analysis (FTA) shown below, identify faulty points. Refrigerant accumulation Excessive compressor ON-OFF Refrigerant overcharge See [Check 6]. [In cooling] If the indoor unit electronic expansion valve excessively opens: (See 1) Faulty superheated degree control Faulty indoor unit electronic expansion valve Faulty control Faulty valve coil Faulty valve body Faulty indoor unit gas pipe thermistor Faulty indoor unit liquid pipe thermistor Faulty outdoor unit main PCB Is the coil resistance and the insulation normal? Is the connector properly connected? Are the thermistor resistance characteristics normal? Is the connector properly connected? Are the thermistor resistance characteristics normal? Faulty outdoor unit electronic expansion valve Faulty valve coil Faulty valve body Is the coil resistance and the insulation normal? Wet operation [In defrosting] If the outdoor unit electronic expansion valve excessively opens: (See 2) Faulty control Faulty low pressure sensor Faulty suction pipe thermistor Faulty outdoor unit main PCB Are the voltage characteristics normal? Is the connector properly connected? Are the thermistor resistance characteristics normal? Is the pressure value on the Service Checker matched to the measurement of sensor? Dirty evaporator Does the heat exchanger get clogged? Degradation in evaporating capacity Drop in air volume Drop in fan output Faulty fan motor Faulty outdoor unit main PCB (including capacity setting) Can the fan motor be rotated by hand? Is the resistance and insulation of motor coil normal? High air duct resistance Dirty filter Obstacles Does the air filter get clogged? Is there any obstacle in the air duct? 1. The indoor unit electronic expansion valve exerts "superheated degree control" in cooling. 2. The outdoor unit electronic expansion valve (EV1) exerts "superheated degree control" in defrosting. 3. Guideline for superheated degree by which a malfunction is judged as wet operation (1) Suction gas superheated degree: Less than 3 C / (2) Discharge gas superheated degree: Less than 15 C; provided, however, that superheated degrees immediately after startup or for drooping control are excluded. (The values aforementioned are just a guideline. Even if the values fall within the range shown above, these values may be normal depending on other conditions.) 134 Air Cooled Refrigeration Condensing Unit

136 SiENBE Troubleshooting [Check 6] Check for Refrigerant Amount Due to relationship to pressure control and electronic expansion valve control, the refrigerant amount needs to be judged according to operating conditions. Refer to information shown below for making judgements. Diagnosis of Refrigerant Overcharge 1. High pressure becomes higher. Consequently, overload control is exerted to make the capacity slightly inadequate. 2. The superheated degree of suction gas becomes lower (or the system is put into wet operation). Consequently, the compressor discharge pipe temperature becomes lower for pressure loads. 3. The subcooled degree of condensate becomes higher. High pressure drooping control High pressure gradually rises with Operating frequency comes to the lowest level. increasing operating frequency. High pressure Subcooled degree becomes higher. (The temperature of liquid connection piping becomes lower.) Low pressure (Low pressure is maintained at a certain level.) Low pressure rises with lowering compressor output. Operating frequency To maintain low pressure, operating frequency increases on the capacity control. Proper amount (Degree of overcharge) Further overcharge Diagnosis of Refrigerant Shortage 1. The superheated degree of suction gas becomes higher, and the temperature of compressor discharge gas also becomes higher. 2. The superheated degree of suction gas becomes higher, and the electronic expansion valve shifts to slightly open. 3. Low pressure is too low to demonstrate cooling capacity (or heating capacity). 4. The liquid level gauge falls into the flash state. The opening degree of the indoor unit electronic expansion valve comes larger. Either electronic expansion valve fully opens. Operating frequency comes to the lowest level. Fan control, i.e., actually hunting to maintain high pressure on the cooling control with low outdoor air High pressure (Low pressure is maintained at a certain level.) Low pressure Low pressure rises with increasing opening degree of the indoor unit electronic expansion valve, and the operating frequency slightly increases due to the capacity control. Operating frequency High pressure increases due to compressor capcity decreasing. To maintain low pressure, operating frequency increases on the capacity control. If the operating frequency reaches the lowest level, low pressure cannot be maintained. Proper amount (Degree of refrigerant shortage) Further short Air Cooled Refrigeration Condensing Unit 135

137 Troubleshooting SiENBE [Check 7] Vacuum Drying Procedure To conduct vacuum drying in the piping system, follow the procedure for <Normal vacuum drying> shown below. Furthermore, if moisture can get mixed in the piping system, follow the procedure for <Special vacuum drying> shown below. <Normal vacuum drying> 1. Vacuum drying Use a vacuum pump that enables vacuuming to a vacuum level of kPa (5 torr, -755 mmhg). Connect a manifold gauge to the service port of the liquid pipe and the gas pipe respectively, and then run the vacuum pump for a period of two or more hours to achieve vacuuming to a vacuum level below kPa. If the vacuum level does not reach below kPa even after vacuuming for a period of two hours, moisture has got mixed in the system or the system has caused vacuum leakage. Consequently, conduct vacuuming for a period of another one hour. If the vacuum level does not reach below kPa even after vacuuming for a period of three hours, conduct leak tests. 2. Leaving in vacuum state Leave the piping system in a vacuum state at a level below kPa for a period of one or more hours, and then check to be sure that the vacuum gauge reading does not rise. (If the reading rises, moisture remains in the system or vacuum leaks from the piping.) 3. Additional refrigerant charge Purge air from the hose connected to the manifold gauge, and then charge a necessary amount of refrigerant. <Special vacuum drying> - In case moisture can get mixed in the piping*: 1. Vacuum drying Follow the same procedure as that for normal vacuum drying 1 aforementioned. 2. Vacuum break Pressurize to 0.05MPa using nitrogen gas. 3. Vacuum drying Conduct vacuum drying for a period of one or more hours. If the vacuum level does not reach below kPa even after vacuuming for a period of two hours, repeat Steps 2 Vacuum break and Step 3 Vacuum drying. 4. Leaving in vacuum state Leave the piping system in a vacuum state at a level below kPa for a period of one or more hours, and then check to be sure that the vacuum gauge reading does not rise. 5. Additional refrigerant charge Purge air from the hose connected to the manifold gauge, and then charge a necessary amount of refrigerant. *Dew may condense in the piping due to construction during rainy season or a long construction period or rainwater may enter the piping during construction. 136 Air Cooled Refrigeration Condensing Unit

138 SiENBE Troubleshooting [Check 8] List of Malfunction Codes Related to Inverter Compressor current Code Name Condition for determining malfunction Major faulty point L5 L8 INV Compressor Instantaneous Overcurrent Overcurrent of INV compressor (electronic thermal) Inverter output causes an overcurrent to flow even instantaneously. The compressor performs overload operation. Loss of synchronization is detected. Inverter getting caught in liquid Faulty compressor Faulty inverter PCB Liquid back of compressor Sharp change in load Disconnection of compressor wiring Faulty inverter PCB Protection device, etc. L1 Faulty Inverter PCB No output is produced. Faulty heavy current part of inverter L9 E5 L4 U2 P1 LC P4 Faulty INV Compressor Startup Inverter Compressor Lock Rise in Radiation Fin Temperature Abnormal Power Supply Voltage Power Supply Imbalance Malfunction Related to Transmission (between Main PCB and Control PCB) Faulty fin thermistor The compressor motor fails to start up. The compressor is in locked state (does not rotate). The radiation fin temperature exceeds the reference value (while in operation). The inverter power supply voltage is high or low. The three-phase power supply has a significant voltage imbalance. The outdoor unit PCB cannot make communications among the control PCB, inverter PCB, and fan PCB. The fin thermistor gets short-circuited or open. Inverter getting caught in liquid or faulty compressor Excessive oil or refrigerant Faulty inverter PCB Faulty compressor Malfunction of fan Long-term overload operation Faulty inverter PCB Abnormal power supply Faulty inverter PCB Abnormal power supply (Power supply imbalance of not less than 2%) Faulty inverter PCB End of PCB service life Broken wire in communication line Faulty control PCB Faulty inverter PCB Faulty fan PCB Faulty fin thermistor Air Cooled Refrigeration Condensing Unit 137

139 Troubleshooting SiENBE [Check 9] Temperature and Resistance Characteristics of Thermistor Outdoor unit Applicable Heat exchanger (Inlet and outlet) Suction air Discharge pipe Radiation fin Type ST0601 ST0602 ST0901 PTP-46D-D1 Temperature( C) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) Air Cooled Refrigeration Condensing Unit

140 SiENBE Troubleshooting [Check 10] Voltage Characteristics of Pressure Sensor PH = 1.38V H 0.69 PL = 0.57V L 0.28 V H : Output voltage [High pressure side] V DC V L : Output voltage [Low pressure side] V DC Pressure detected P H, P L (kg/cm 2 ) MPa PH : High pressure (MPa) PL : Low pressure (MPa) High pressure (PH) (1.7MPa) Low pressure (PL) VDC Output voltage (VH, VL) Air Cooled Refrigeration Condensing Unit 139

141 Troubleshooting SiENBE Characteristics of Refrigerant and Psychrometric Chart Characteristics of Refrigerant R-410A R-410A m 3 /kg C C m 3 /kg m 3 /kg m 3 /kg m 3 /kg m 3 /kg m 3 /kg m 3 /kg m 3 /kg 100 C m 3 /kg m 3 /kg C m 3 /kg 10 0 C 0.1 m 3 /kg m 3 /kg m 3 /kg -50 C 1m 3 /kg m 3 /kg 5 m 3 /kg m3/kg x= kJ/(kg k) kJ/(kg k) kJ/(kg k) -100 C Enthalpy kj\kg Pressure MPa Air Cooled Refrigeration Condensing Unit

142 SiENBE Troubleshooting 6.7 Maintenance 1. Procedure for Removal of Parts from Refrigerant System As the results of checking a malfunction, if the malfunction results from part(s) used in the refrigerant system, remove the part(s) referring to the procedure for refrigerant recovery shown below Location of malfunction Outdoor unit compressors (M1C, M2C and M3C) Solenoid valves (for STD1 and STD2) INV electronic expansion valve Four way valve High pressure switches Main electronic expansion valve Injection electronic expansion valve Secondary equipment, such as a showcase Dryer Procedure for maintenance Refer to Maintenance 1. Refer to Maintenance 2. Refer to Maintenance 3. High pressure sensor A check valve allows it to be 4 removed and replaced without any Low pressure sensor refrigerant recovery. If liquid refrigerant was recovered, add refrigeration oil according to the following criteria. Refrigeration oil brand: Idemitsu DAPHNE FVC68D Amount to be added: Volume of recovered refrigerant (kg) x 0.05 liter (Example: If the volume of the refrigerant recovered is 24kg, 24 x 0.05 = 1.2 liter of oil that should be added.) Fill port: Liquid stop valve service port For details about adding oil, see the section that describes the refrigeration oil procedure. Air Cooled Refrigeration Condensing Unit 141

143 Troubleshooting SiENBE ) Maintenance 1: Maintenance related to outdoor unit compressor Applicable parts 1 compressor Compressors (M1C, M2C and M3C) Solenoid valves (STD1 and STD2) INV electronic expansion valve Four way valve High pressure switch No continuous operations allowed HPSL D HPS1 HP a Td1 INV Tg A b LP Tce C B EV2 c TL EV1 A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valve D: Gas stop valve a, b, c: Service ports 1. Turn off the operation switch for the outdoor unit. After the outdoor unit has stopped, turn off the power supply for the outdoor unit. 2. Remove the control box. 3. Close the stop valves in the order: A, D and then B. 4. Recover the refrigerant in the compressor through service ports a, b and maintenance valves A and B. ( shaped region.) Repair or replace the applicable parts. After replacing the compressor, check whether the dryer is WET or DRY using the moisture indicator. If it is WET, replace the dryer. 5. Conduct air tight checks. 6. Conduct vacuuming through the service port b, and the maintenance valve A and B. (If the oil needs to be added, charge it through the service port a.) 7. Turn on the power supply for the outdoor unit. Then turn on the operation switch for the outdoor unit. (If a remote controller switch is used, enable the remote setting.) 8. Charge the refrigerant by the same quantity as that recovered. 142 Air Cooled Refrigeration Condensing Unit

144 SiENBE Troubleshooting Applicable parts 2 compressors Compressors (M1C, M2C and M3C) Solenoid valves (STD1 and STD2) INV electronic expansion valve Four way valve High pressure switch No continuous operations allowed Ta HPSL D a HP LP A HPS1 HPS2 b Td1 Td2 EV3 INV SV2 STD1 Tce C Tg B c TL EV2 EV1 A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valve D: Gas stop valve a, b, c: Service ports 1. Turn off the operation switch for the outdoor unit. After the outdoor unit has stopped, turn off the power supply for the outdoor unit. 2. Remove the control box. 3. Close the stop valves in the order: A, D and then B. 4. Recover the refrigerant in the compressor through service ports a, b and maintenance valves A and B. ( shaped region.) Repair or replace the applicable parts. After replacing the compressor, check whether the dryer is WET or DRY using the moisture indicator. If it is WET, replace the dryer. 5. Conduct air tight checks. 6. Conduct vacuuming through the service port b, and the maintenance valve a and B. (If the oil needs to be added, charge it through the service port A.) 7. Turn on the power supply for the outdoor unit. Then turn on the operation switch for the outdoor unit. (If a remote controller switch is used, enable the remote setting.) 8. Charge the refrigerant by the same quantity as that recovered. Air Cooled Refrigeration Condensing Unit 143

145 Troubleshooting SiENBE Applicable parts 3 compressors Compressors (M1C, M2C and M3C) Solenoid valves (STD1 and STD2) INV electronic expansion valve Four way valve High pressure switch No continuous operations allowed A Ta HPSL b D HPS1 a HPS2 HP HPS3 LP Td1 EV3 INV Td2 STD1 SV2 Td3 STD2 SV3 Tce C B TL c Tg EV2 EV1 A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valve D: Gas stop valve a, b, c: Service ports 1. Turn off the operation switch for the outdoor unit. After the outdoor unit has stopped, turn off the power supply for the outdoor unit. 2. Remove the control box. 3. Close the stop valves in the order: A, D and then B. 4. Recover the refrigerant in the compressor through service ports a, b and maintenance valves A and B. ( shaped region.) Repair or replace the applicable parts. After replacing the compressor, check whether the dryer is WET or DRY using the moisture indicator. If it is WET, replace the dryer. 5. Conduct air tight checks. 6. Conduct vacuuming through the service port b, and the maintenance valve a and B. (If the oil needs to be added, charge it through the service port A.) 7. Turn on the power supply for the outdoor unit. Then turn on the operation switch for the outdoor unit. (If a remote controller switch is used, enable the remote setting.) 8. Charge the refrigerant by the same quantity as that recovered. 144 Air Cooled Refrigeration Condensing Unit

146 SiENBE Troubleshooting 2) Maintenance 2: Maintenance of EV1 and EV2 Applicable parts 1 compressor Main electronic expansion valve Injection electronic expansion valve No continuous operations allowed HPSL D HPS1 HP A a Td1 INV b LP Tg Tce C B EV2 c TL EV1 A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valve D: Gas stop valve a, b, c: Service ports 1. Turn off the operation switch for the outdoor unit. After the outdoor unit has stopped, turn off the power supply for the outdoor unit. 2. Remove the control box. 3. Close the stop valves in the order: C and D. 4. Recover the refrigerant in the compressor through service ports c, b. ( shaped region.) Repair or replace the applicable parts. After replacing parts, check whether the dryer is WET or DRY using the moisture indicator. If it is WET, replace the dryer. 5. Conduct air tight checks. 6. Conduct vacuuming through the service port c and b. (Then charge the refrigerant according to the quantity as that recovered. And then continue vacuuming.) 7. Turn on the power supply for the outdoor unit. Then turn on the operation switch for the outdoor unit. (If a remote controller switch is used, enable the remote setting.) 8. Charge the refrigerant by the same quantity as that recovered. Air Cooled Refrigeration Condensing Unit 145

147 Troubleshooting SiENBE Applicable parts 2 compressors Main electronic expansion valve Injection electronic expansion valve No continuous operations allowed Ta HPSL D a HP LP A HPS1 HPS2 b Td1 Td2 EV3 INV SV2 STD1 Tce C Tg B c TL EV2 EV1 A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valve D: Gas stop valve a, b, c: Service ports 1. Turn off the operation switch for the outdoor unit. After the outdoor unit has stopped, turn off the power supply for the outdoor unit. 2. Remove the control box. 3. Close the stop valves in the order: C and D. 4. Recover the refrigerant in the compressor through service ports c, b. ( shaped region.) Repair or replace the applicable parts. After replacing parts, check whether the dryer is WET or DRY using the moisture indicator. If it is WET, replace the dryer. 5. Conduct air tight checks. 6. Conduct vacuuming through the service port c and b. (Then charge the refrigerant according to the quantity as that recovered. And then continue vacuuming.) 7. Turn on the power supply for the outdoor unit. Then turn on the operation switch for the outdoor unit. (If a remote controller switch is used, enable the remote setting.) 8. Charge the refrigerant by the same quantity as that recovered. 146 Air Cooled Refrigeration Condensing Unit

148 SiENBE Troubleshooting Applicable parts 3 compressors Main electronic expansion valve Injection electronic expansion valve No continuous operations allowed A Ta HPSL b D HPS1 a HPS2 HP HPS3 LP Td1 EV3 INV SV2 Td2 STD1 SV3 Td3 STD2 Tce C Tg B c Tg EV2 TL EV1 A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valve D: Gas stop valve a, b, c: Service ports 1. Turn off the operation switch for the outdoor unit. After the outdoor unit has stopped, turn off the power supply for the outdoor unit. 2. Remove the control box. 3. Close the stop valves in the order: C and D. 4. Recover the refrigerant in the compressor through service ports c, b. ( shaped region.) Repair or replace the applicable parts. After replacing parts, check whether the dryer is WET or DRY using the moisture indicator. If it is WET, replace the dryer. 5. Conduct air tight checks. 6. Conduct vacuuming through the service port c and b. (Then charge the refrigerant according to the quantity as that recovered. And then continue vacuuming.) 7. Turn on the power supply for the outdoor unit. Then turn on the operation switch for the outdoor unit. (If a remote controller switch is used, enable the remote setting.) 8. Charge the refrigerant by the same quantity as that recovered. Air Cooled Refrigeration Condensing Unit 147

149 Troubleshooting SiENBE ) Maintenance 3: Maintenance of showcase and dryer Applicable parts 1 compressor Main electronic expansion valve Injection electronic expansion valve No continuous operations allowed HPSL D HPS1 HP A a Td1 INV b LP Tg Tce C B EV2 c TL EV1 A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valve D: Gas stop valve a, b, c: Service ports 1. Close the stop valve C to conduct pump down operation. (The compressor will automatically stop or the pump down operation will be conducted for a period of 10 minutes.) 2. Turn off the operation switch for the outdoor unit. After the outdoor unit has stopped, turn off the power supply for the outdoor unit. 3. Remove the control box. 4. Close the stop valves in the order: C and D. 5. Recover the refrigerant in the compressor through the liquid stop valve C and gas stop valve D. ( shaped region.) Repair or replace the applicable parts. 6. Conduct air tight checks. 7. Conduct vacuuming through the liquid stop valve C and gas stop valve D. 8. Turn on the power supply for the outdoor unit. Then turn on the operation switch for the outdoor unit. (If a remote controller switch is used, enable the remote setting.) 9. Charge the refrigerant by the same quantity as that recovered with a charging cylinder. 148 Air Cooled Refrigeration Condensing Unit

150 SiENBE Appendix (Supplementary Information) 7. Appendix (Supplementary Information) 7.1 Restriction Matter of Showcase The design pressure of the indoor unit must be 2.5MPa. Install an R410A mechanical thermostatic expansion valve on eachlindoor unit. Install an R410A solenoid valve (Max. operating differential pressure of 3.5 MPa (35 bars) or over) on the primary side of the mechanical thermostatic expansion valve described above for each indoor unit. Install a filter on the primary side of the solenoid valve described above for each indoor unit. Determine the filter mesh count based on the size specified by the solenoid valve and mechanical thermostatic expansion valve being used. Mechanical Liquid solenoid thermostatic expansion valve Filter Flow of refrigerant Route the path to the indoor unit heat exchanger so that the flow or refrigerant is from top to bottom. Evaporator inlet Evaporator outlet Evaporator inlet Evaporator outlet Evaporator outlet Evaporator inlet Wlhen installing a number of indoor units, be sure to install them at the same level. Difference in height between indoor units to be 5m or less. Use either off-cycle defrosting or electric heater defrosting as the defrostingltype. Hot-gas defrosting models cannot be used. 7.2 Selection of Expansion Valve The expansion valve must use made of the Danfoss. EEV (On/Off switching electric expansion valve) cannot be used. Air Cooled Refrigeration Condensing Unit 149

151 Appendix (Supplementary Information) SiENBE Trouble Case with Present Machine (R-407C) Compressor damage due to the overcharge of refrigerant in the field Cause By mistake, a local installer added 1.3 times of the total refrigerant, not 1.3 times of the additional charging refrigerant which is specified in the Installation Manual. (It is already explained in the service news #MJ See the next page for more details.) Prevention of new models New models have improved compressor reliability by countermeasure control functions of current models. Also, the amount of the additional charging refrigerant at the field specified up to 0.1 times only. Request for the indication of additional refrigerant charging amount and installation date *Be sure to fill the blanks, which are needed for after-sale services. Please calculate the amount of additional refrigerant charging as following method. (1)By piping length of system Please calculate from the total length of the liquid pipes. Calculate the total piping length of each size as follows. (2)By connecting showcase Please calculate from the capacity of the connected showcase as below tables. Capacity of showcase (*Note.) Amount of refrigerant Showcase Blower MT LT coil less than 5kW 1.1kg 1.4kg 0.6kg From 5kW to less than 10kW 2.3kg 3.2kg 1.2kg From 10kW to less than 15kW 3.4kg 5.2kg 1.7kg From 15kW to less than 20kW 4.6kg 2.3kg From 20kW to less than 25kW 5.9kg 3.0kg From 25kW to less than 30kW 7.0kg 3.5kg From 30kW to less than 35kW 8.2kg 4.1kg From 35kW to less than 40kW 9.7kg 4.9kg 40kW or more 11.0kg 5.5kg (3)Constant Add constant amount by outdoor unit model Outdoor unit Amount of refrigerant LRLEQ5, 6AY1 LRMEQ5, 6AY1 1.0kg LRLEQ8~12AY1 LRMEQ8~12AY1 3.0kg LRLEQ15~20AY1 LRMEQ15~20AY1 3.5kg Total length of φ15.9 liquid pipes + Total length of φ12.7 liquid pipes Total length of φ9.5 liquid pipes Charging amount by piping length (m) 0.19 (m) 0.12 (m) 0.06 (1) kg *Note) 1. Case of showcase the condition of capacity (evaporating temperature) MT (Medium temperature): 10 C LT (Low temperature): 35 C 2. Case of blower coil, the condition of capacity is 10 C (Td). Capacity of showcase kw + Amount of refrigerant kg (4)By adjustment (When the liquid eye shows shortage of refrigerant.) When test running, add refrigerant if the liquid eye not be in sealing states at cooling operation. (4)By adjustment (2)By connecting showcase 0.1 Capacity of blower coil kw Amount of refrigerant kg Charging amount by connecting showcase (2) kg Constant (3) kg Charging amount by adjustment (4) kg Full of liquid A few bubbles flow. (A) Total additional charging amount (B) Manufacture's label value (A)+(B) Bubbles come out at all times. Sealed state ( ) Shortage of refrigerant (5) (1)+(2)+ (3)+(4) kg Charging amount (Factory set) Total amount of refrigerant Do not be over 10% of (2) amount by connecting showcase. 3P A kg kg 150 Air Cooled Refrigeration Condensing Unit

152 SiENBE Appendix (Supplementary Information) Secret MJ PR Model <Convenience-pack> Re-precaution: Hard-and-fast additional refrigerant charge in commissioning LRLCP14D1, 2 and all other convenience-pack models This is to inform you again of the precaution (MJ06053) "For additional charge in a commissioning of Conveni-pack, the upper limit shall be 1.3 times as much as that calculated." Because there was a compressor failure caused by over charge that is assumed to be due to a miscalculation. [Case example] At the time of calculation of the upper limit of additional charge, "Initial charge in outdoor unit" was added. After the refrigerant was charged by the calculated upper limit above, the over charge "4.29kg (30% of 14.3kg of the initial charge in the outdoor unit)" caused the compressor failure. [Upper limit of additional refrigerant charge in commissioning] Correct [Additional charge in the field (Calculated value depending on piping length) ] 1.3 Wrong [Charge at factory + Additional charge in the field (Calculated value depending on piping length) ] 1.3 Example: Additional charge (Calculated value) :15kg The upper limit of additional charge : 19.5kg (15 1.3=19.5) [Precaution for charging refrigerant] For additional charge, please do not charge the upper limit of refrigerant at a time. When charging refrigerant more than additional charge in the field (calculated value), please charge refrigerant while observing through a sight glass. A few bubbles are not problem. So please keep strictly the upper limit of additional refrigerant charge (This unit performs an oil return irregularly by on-off operation of a solenoid valve. Some transiently-generated flashes during the solenoid valve operation are not problem.) When a solenoid valve is turned onin sealed condition Flashes appear Even though a solenoid valve is turned off, flashes sometimes appear. Solenoid valve OFF (Sealed condition) Solenoid ON (Flashes appear) Solenoid valve After OFF (Just before sealed condition) Air Cooled Refrigeration Condensing Unit 151

153 Appendix (Supplementary Information) SiENBE Method of removed and replaced compressor in field This system s compressor has gas injection pipe. When you replace the compressor, you must remove the piping fixture with gas injection pipe. Please follow the procedure, replace the compressor. Gas injection pipe Suction pipe Discharge pipe Arrow view Method removed piping fixture for gas injection pipe (1) Insert the tool from behind the compressor, remove the hexagon head screw (A) and tube fixture (C).On the other screw (B), slacken it. (2) Turn the piping fixture on a point of tube holder (D), fold it toward. (3) Cut the pipe for compressor with pipe-cutter. M5 Hexagon head screw (A) Tube holder (C) Turn the piping fixture Cutting point Piping fixture (stainless-steel) Tube holder (D) View M5 Hexagon head screw (B) Tube holder (D) Recommended tool for removed the screw Tool Ratchet socket wrench Spanner Driver(+) Expect the flat type Only small size type Only short-shank type 152 Air Cooled Refrigeration Condensing Unit