DC INVERTER SPLIT SYSTEM AIR CONDITIONER

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1 AIR CONDITIONER TECHNICAL & SERVICE MANUAL MCAF88R5I + GRF86R5I MCAF48R5I + GRF46R5I FILE NO. Destination: Europe DC INVERTER SPLIT SYSTEM AIR CONDITIONER Indoor Model No. Product Code No. MCAF88R5I MCAF88R5IAA ( ) MCAF48R5I MCAF48R5IAA ( ) Outdoor Model No. Product Code No. GRF86R5I GRF86R5IAA ( ) GRF46R5I GRF46R5IAA ( ) Indoor Unit Outdoor Unit MCAF88R5I MCAF48R5I GRF86R5I GRF46R5I RoHS This product does not contain any hazardous substances prohibited by the RoHS Directive. WARNING You are requested to use RoHS compliant parts for maintenance or repair. You are requested to use lead-free solder. F-GAS REGULATION (EC) No 84 / 006 Do not vent R40A into atmosphere : R40A is a fluorinated greenhouse gas, covered by Kyoto Protocol, with a Global Warming Potential (GWP) = 975. REFERENCE NO. SM70074

2 Important! Please Read Before Starting This air conditioning system meets strict safety and operating standards. As the installer or service person, it is an important part of your job to install or service the system so it operates safely and efficiently. For safe installation and trouble-free operation, you must: Carefully read this instruction booklet before beginning. Follow each installation or repair step exactly as shown. Observe all local, state, and national electrical codes. Pay close attention to all warning and caution notices given in this manual. This symbol refers to a hazard or unsafe practice which can WARNING result in severe personal injury or death. This symbol refers to a hazard or unsafe practice which can CAUTION result in personal injury or product or property damage. If Necessary, Get Help These instructions are all you need for most installation sites and maintenance conditions. If you require help for a special problem, contact our sales/service outlet or your certified dealer for additional instructions. In Case of Improper Installation The manufacturer shall in no way be responsible for improper installation or maintenance service, including failure to follow the instructions in this document. SPECIAL PRECAUTIONS WARNING When Wiring ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL INJURY OR DEATH. ONLY A QUALIFIED, EXPERIENCED ELECTRICIAN SHOULD ATTEMPT TO WIRE THIS SYSTEM. Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked. Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and these instructions when wiring. Improper connections and inadequate grounding can cause accidental injury or death. Ground the unit following local electrical codes. Connect all wiring tightly. Loose wiring may cause overheating at connection points and a possible fire hazard. Install a protective leakage breaker depending on the installation location (especially a damp or humid location). If a leakage breaker is not installed, electric shock can occur. When Transporting Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees when lifting to reduce strain on your back. Sharp edges or thin aluminum fins on the air conditioner can cut your fingers. When Installing In a Ceiling or Wall Make sure the ceiling/wall is strong enough to hold the unit s weight. It may be necessary to construct a strong wood or metal frame to provide added support. In a Room Properly insulate any tubing run inside a room to prevent "sweating" that can cause dripping and water damage to walls and floors. In Moist or Uneven Locations Use a raised concrete pad or concrete blocks to provide a solid, level foundation for the outdoor unit. This prevents water damage and abnormal vibration. In an Area with High Winds Securely anchor the outdoor unit down with bolts and a metal frame. Provide a suitable air baffle. In a Snowy Area (for Heat Pump-type Systems) Install the outdoor unit on a raised platform that is higher than drifting snow. Provide snow vents. When Connecting Refrigerant Tubing Use the flare method for connecting tubing. Apply refrigerant lubricant to the matching surfaces of the flare and union tubes before connecting them, then tighten the nut with a torque wrench for a leak-free connection. Check carefully for leaks before starting the test run. When Servicing Turn the power off at the main power box (mains) before opening the unit to check or repair electrical parts and wiring. Keep your fingers and clothing away from any moving parts. Clean up the site after you finish, remembering to check that no metal scraps or bits of wiring have been left inside the unit being serviced. Others CAUTION Ventilate any enclosed areas when installing or testing the refrigeration system. Escaped refrigerant gas, on contact with fire or heat, can produce dangerously toxic gas. Confirm upon completing installation that no refrigerant gas is leaking. If escaped gas comes in contact with a stove, gas water heater, electric room heater or other heat source, it can produce dangerously toxic gas.

3 Table of Contents. OPERATING RANGE... Page 5. SPECIFICATIONS -. Unit Specifications Major Component Specifications Other Component Specifications.... DIMENSIONAL DATA REFRIGERANT FLOW DIAGRAM 4-. Refrigerant Flow Diagram PERFORMANCE DATA 5-. Temperature Charts Air Throw Distance Charts ELECTRICAL DATA 6-. Electrical Characteristics 6-. Electric Wiring Diagrams 7. INSTALLATION INSTRUCTIONS 7-. Installation Site Selection Recommended Wire Length and Diameter Remote Control Unit Installation Position How to Test Run the Air Conditioner Remove the Grille to Install the Indoor Unit MAINTENANCE 8-. Address Setting of the Remote Control Unit Disconnecting and Connecting Positive Connector for Outdoor Unit FUNCTIONS 9-. Operation Functions 9-. Protective Functions

4 Page 0. TROUBLESHOOTING 0-. Precautions before Performing Inspection or Repair Method of Self-Diagnostics Checking the Indoor and Outdoor Units Trouble Diagnosis of Fan Motor Noise Malfunction and Electromagnetic Interference.... CHECKING ELECTRICAL COMPONENTS -. Measurement of Insulation Resistance Checking Continuity of Fuse on PCB Ass'y.... REFRIGERANT R40A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT -. Characteristics of New Refrigerant R40A Checklist before Servicing Tools Specifically for R40A Tubing Installation Procedures In Case of Compressor Malfunction In Case Refrigerant is Leaking Charging Additional Refrigerant Retro-Fitting Existing Systems APPENDIX INSTRUCTION MANUAL

5 . OPERATING RANGE Cooling Heating Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp. Maximum Minimum Maximum Minimum C D.B. / C W.B. 9 C D.B. / 4 C W.B. 7 C D.B. 6 C D.B. 4 C D.B. -5 C D.B. 4 C D.B. / 8 C W.B. _ D.B. / -5 C W.B. 5

6 . SPECIFICATIONS -. Unit Specifications Indoor Unit Outdoor Unit MCAF88R5I GRF86R5I Power Source Voltage Rating 0 to 40V Single-Phase 50Hz 0V Performance Capacity Air Circulation (High) Moisture Removal (High) kw BTU/h m /h Liters/h 5.5 7,600 Cooling (. to 5.5 ) ( 4,00 to 8,800 ) ,500 Heating (. to 6.4 ) ( 4,400 to,800 ) 90 - Electrical Rating Cooling Heating Available Voltage Range V 98 to 64 Running Amperes Power Input A W 7.0,500 (. to 8.4 ) ( 50 to,800 ) 7.4,575 (. to 9.0 ) ( 70 to,90 ) Power Factor % 9 9 E.E.R. W/W.4 - C.O.P. W/W -.8 Compressor Locked Rotor Amperes A Features Controls / Temperature Control Control Unit Timer Fan Speeds Indoor / Outdoor Airflow Direction (Indoor) Horizontal Vertical Air Filter Compressor Refrigerant / Amount charged at shipment kg Refrigerant Control Operation Sound (*Qt = Quiet mode) Indoor : Hi/Me/Lo/Qt* Outdoor : Hi db-a db-a Refrigerant Tubing Connections Max. allowable tubing length at shipment m Refrigerant Narrow tube mm (in.) Tube Diameter Wide tube mm (in.) Refrigerant Tube Kit / Accessories Dimensions & Weight Unit Dimensions Package Dimensions Weight Shipping Volume Height Width Depth Height Width Depth Net Shipping mm mm mm mm mm mm kg kg Remarks: Rating conditions are: Cooling: Indoor air temperature 7 C D.B. / 9 C W.B. Outdoor air temperature 5 C D.B. / 4 C W.B. Heating: Indoor air temperature 0 C D.B. Outdoor air temperature 7 C D.B. / 6 C W.B. m Microprocessor / I.C. Thermister Wireless Remote Control Unit 4-Hour ON or OFF Timer, Hour OFF Timer Auto and steps / Auto (Hi, Me, Lo) Manual Auto Washable, Anti-Mold DC Twin Rotary (Inverter) R40A /. Electric Expansion Valve 4 / 8 / 0 / 8 4 / 8 / 0 /8 5 5 Flare Type (/4).7 (/) Optional / Air Clean Filter Indoor Unit Outdoor Unit , ,40, DATA SUBJECT TO CHANGE WITHOUT NOTICE. 6

7 Indoor Unit Outdoor Unit MCAF48R5I GRF46R5I Power Source Voltage Rating 0 to 40V Single-Phase 50Hz 0V Performance Capacity Air Circulation (High) Moisture Removal (High) kw BTU/h m /h Liters/h 7. 4,00 Cooling (. to 8.0 ) ( 4,00 to 7,00 ), ,000 Heating (. to 9.5 ) ( 4,400 to,400 ),0 - Electrical Rating Cooling Heating Available Voltage Range V 98 to 64 Running Amperes Power Input A W 0.7,55 (. to.6 ) ( 80 to,845 ).,490 (. to 5. ) ( 90 to,50 ) Power Factor % E.E.R. W/W.0 - C.O.P. W/W -.4 Compressor Locked Rotor Amperes A Features Controls / Temperature Control Control Unit Timer Fan Speeds Indoor / Outdoor Airflow Direction (Indoor) Horizontal Vertical Air Filter Compressor Refrigerant / Amount charged at shipment kg Refrigerant Control Operation Sound (*Qt = Quiet mode) Indoor : Hi/Me/Lo/Qt* Outdoor : Hi db-a db-a Refrigerant Tubing Connections Max. allowable tubing length at shipment m Refrigerant Narrow tube mm (in.) Tube Diameter Wide tube mm (in.) Refrigerant Tube Kit / Accessories Dimensions & Weight Unit Dimensions Package Dimensions Weight Shipping Volume Height Width Depth Height Width Depth Net Shipping mm mm mm mm mm mm kg kg Remarks: Rating conditions are: Cooling: Indoor air temperature 7 C D.B. / 9 C W.B. Outdoor air temperature 5 C D.B. / 4 C W.B. Heating: Indoor air temperature 0 C D.B. Outdoor air temperature 7 C D.B. / 6 C W.B. m Microprocessor / I.C. Thermister Wireless Remote Control Unit 4-Hour ON or OFF Timer, Hour OFF Timer Auto and steps / Auto (Hi, Me, Lo) Manual Auto Washable, Anti-Mold DC Twin Rotary (Inverter) R40A /.95 Electric Expansion Valve 47 / 44 / 4 / 0 46 / 4 / 40 / Flare Type (/4) 5.88 (5/8) Optional / Air Clean Filter Indoor Unit Outdoor Unit , ,40, DATA SUBJECT TO CHANGE WITHOUT NOTICE. 7

8 -. Major Component Specifications --. Indoor Unit Indoor Unit MCAF88R5I Control PCB Part No. Controls Control Circuit Fuse Remote Control Unit CB-KRV84EH Microprocessor 50V.5A RCS-4MHVPINW4E Fan Type Q'ty... Dia. and Length mm Cross-Flow... D94 / L845 Fan Motor Type Model... Q'ty No. of Poles Rough Measure RPM (Cool / Heat) Nominal Output Coil Resistance (Ambient Temp. 0 C) Safety Device Type Over-Current Protection Over-Heat Protection Run Capacitor Flap Motor Type Model Rating Coil Resistance (Ambient Temp. 5 C) Heat Exchanger Coil Coil Rows Fin Pitch Face Area W Ohm Micro F VAC Ohm mm m DC Motor SIC-9CVL-D847--A... 8,50 /, Internal Controller Yes Yes - - Stepping Motor MP4Z DC V Each Pair of Terminal : 400 +/- 7% Aluminum Plate Fin / Copper Tube DATA SUBJECT TO CHANGE WITHOUT NOTICE. 8

9 Indoor Unit MCAF48R5I Control PCB Part No. Controls Control Circuit Fuse Remote Control Unit CB-KRV44EH Microprocessor 50V.5A RCS-4MHVPINW4E Fan Type Q'ty... Dia. and Length mm Cross-Flow... D94 / L845 Fan Motor Type Model... Q'ty No. of Poles Rough Measure RPM (Cool / Heat) Nominal Output Coil Resistance (Ambient Temp. 0 C) Safety Device Type Over-Current Protection Over-Heat Protection Run Capacitor Flap Motor Type Model Rating Coil Resistance (Ambient Temp. 5 C) Heat Exchanger Coil Coil Rows Fin Pitch Face Area W Ohm Micro F VAC Ohm mm m DC Motor SIC-9CVL-D847--A... 8,500 /, Internal Controller Yes Yes - - Stepping Motor MP4Z DC V Each Pair of Terminal : 400 +/- 7% Aluminum Plate Fin / Copper Tube DATA SUBJECT TO CHANGE WITHOUT NOTICE. 9

10 --. Outdoor Unit Outdoor Unit GRF86R5I Control PCB Part No. Controls Control Circuit Fuse Compressor Type Compressor Model / Nominal Output Compressor Oil... Amount Coil Resistance (Ambient Temp. 0 C) CC Ohm Safety Device CT (Peak current cut-off control) Compressor Discharge Temp. Control Operation cut-off control in abnormal ambient Temp. Overload Relay Model Operating Temp. Run Capacitor Micro F VAC Crankcase Heater CB-CRV84EH Microprocessor 50V 5A DC Twin Rotary (Hermetic) C-6RVN9H0M /,050W FV50S R - S : 0.48 S - T : 0.48 T - R : 0.48 Yes Yes Yes CS-7L5 Open : 5 C, Close : 95 C Fan Type Q'ty... Dia. mm Propeller... D40 Fan Motor Type Model... Q'ty No. of Poles Rough Measure RPM (Cool / Heat) Nominal Output Coil Resistance (Ambient Temp. 0 C) Safety Device Run Capacitor Type Over-Current Protection Over-Heat Protection W Ohm Micro F VAC DC Motor DAJ-55J7A-CR / BRN - : BLU : 77.5 BLU - RED : 77.5 Internal Controller Yes Yes - - Heat Exchanger Coil Coil Rows Fin Pitch mm Aluminum Plate Fin / Copper Tube. Face Area m 0.50 External Finish Acrylic baked-on enamel finish DATA SUBJECT TO CHANGE WITHOUT NOTICE. 0

11 Outdoor Unit GRF46R5I Control PCB Part No. Controls Control Circuit Fuse Compressor Type Compressor Model / Nominal Output Compressor Oil... Amount Coil Resistance (Ambient Temp. 5 C) CC Ohm Safety Device CT (Peak current cut-off control) Compressor Discharge Temp. Control Operation cut-off control in abnormal ambient Temp. Overload Relay Model Operating Temp. Run Capacitor Micro F VAC Crankcase Heater CB-CRV44EH Microprocessor 50V 5A DC Twin Rotary (Hermetic) G8T65FUJW /,40W FV50S U - V : 0.6 V - W : 0.6 W - U : 0.6 Yes Yes Yes CS-7L5 Open : 5 C, Close : 95 C - - 0V 5W Fan Type Q'ty... Dia. mm Propeller... D460 Fan Motor Type Model... Q'ty No. of Poles Rough Measure RPM (Cool / Heat) Nominal Output Coil Resistance (Ambient Temp. 0 C) W Ohm DC Motor SIC-7FW-D / Safety Device Run Capacitor Type Over-Current Protection Over-Heat Protection Micro F VAC Internal Controller Yes Yes - - Heat Exchanger Coil Coil Rows Fin Pitch mm Aluminum Plate Fin / Copper Tube.4 Face Area m External Finish Acrylic baked-on enamel finish DATA SUBJECT TO CHANGE WITHOUT NOTICE.

12 -. Other Component Specifications Indoor Unit MCAF88R5I MCAF48R5I Outdoor Unit GRF86R5I GRF46R5I Indoor air temp sensor (Model:PTM-D5H-S- TH) Indoor heat exchanger sensor (Model:PTM-D5H-S- TH) Compressor temp sensor (Model:TKS9B) Resistance (k ohm) Resistance (k ohm) Temperature ( C) Temperature ( C) Outdoor air temp sensor (Model:TKS95B) Outdoor heat exchanger sensor (Model:TKS9B) 40 Resistance (k ohm) Temperature ( C)

13 . DIMENSIONAL DATA Indoor Unit MCAF88R5I MCAF48R5I Unit: mm

14 Outdoor Unit GRF86R5I 608 AIR INTAKE ID:8 -ID: AIR DISCHARGE AIR INTAKE Wide tube service valve dia..70(/") Narrow tube service valve dia.6.5(/4") 45 Unit: mm 4

15 Outdoor Unit GRF46R5I 608 AIR INTAKE ID:8 5-ID: AIR INTAKE AIR DISCHARGE Narrow tube service valve dia.6.5(/4") Wide tube service valve dia.5.88(5/8") 5 4 Unit: mm 5

16 4. REFRIGERANT FLOW DIAGRAM 4-. Refrigerant Flow Diagram Indoor Unit MCAF88R5I MCAF48R5I Outdoor Unit GRF86R5I GRF46R5I Indoor unit Outdoor unit Wide tube * Wide tube service valve Muffler Accumulator 4-way valve Compressor Heat exchanger Heat exchanger Narrow tube O.D. 6.5 mm (/4") Narrow tube service valve Strainer Electric expansion valve M Capillary tube for split flow * O.D..70mm (/") class O.D.5.88mm (5/8") class Cooling cycle (Defrosting cycle) Heating cycle Insulation of Refrigerant Tubing IMPORTANT Because capillary tubing is used in the outdoor unit, both the wide and narrow tubes of this air conditioner become cold. To prevent heat loss and wet floors due to dripping of condensation, both tubes must be well insulated with a proper insulation material. The thickness of the insulation should be a min. 8 mm. Thickness: Min. 8 mm Insulation Thickness: Min. 8 mm CAUTION After a tube has been insulated, never try to bend it into a narrow curve because it can cause the tube to break or crack. Wide tube Narrow tube 6

17 5. PERFORMANCE DATA 5-. Temperature Charts Indoor Unit MCAF88R5I Outdoor Unit GRF86R5I Cooling Characteristics Heating Characteristics Low pressure at wide tube service valve MPa (kgf/cm G). (.). (0.).0 (9.) 9 (8.) Outdoor fan speed Low High Indoor air temp.0 C 7 C 4 C High pressure at wide tube service valve MPa (kgf/cm G).5 (4.7).0 (9.6).5 (4.5).0 (9.4) Indoor air temp. C Outdoor air temperature ( C) Outdoor air temperature ( C) 0 C 7 C 9 Outdoor fan speed Low High 0 Operating current (A) C Indoor air temp.0 C 4 C Operating current (A) C Indoor air temp. C 7 C Outdoor air temperature ( C) Outdoor air temperature ( C) Indoor discharge air temperature ( C) Outdoor fan speed Low High Indoor air temp.0 C 7 C 4 C Indoor discharge air temperature ( C) Indoor air temp. C 0 C 7 C Outdoor air temperature ( C) Outdoor air temperature ( C) NOTE Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value. Overload prevention operates to protect the air conditioner when outdoor ambient temperature becomes extremely high in heating mode. (Refer to "9-. Overload prevention during heating.") :Points of rating condition Black dots in above charts indicate the following rating conditions. Indoor air temperature 7 C D.B. / 9 C W.B. Heating: Outdoor air temperature 5 C D.B. / 4 C W.B. Cooling: 7 Indoor air temperature 0 C D.B. Outdoor air temperature 7 C D.B. / 6 C W.B.

18 Indoor Unit MCAF48R5I Outdoor Unit GRF46R5I Cooling Characteristics Heating Characteristics Low pressure at wide tube service valve MPa (kgf/cm G). (.). (0.).0 (9.) 9 (8.) Outdoor fan speed Low High Indoor air temp.0 C 7 C 4 C High pressure at wide tube service valve MPa (kgf/cm G).5 (4.7).0 (9.6).5 (4.5).0 (9.4) Indoor air temp. C Outdoor air temperature ( C) Outdoor air temperature ( C) 0 C 7 C 5 4 Outdoor fan speed Low High 6 5 Operating current (A) 0 7 C Indoor air temp.0 C 4 C Operating current (A) 4 Indoor air temp. C 0 C 7 C Outdoor air temperature ( C) Outdoor air temperature ( C) Indoor discharge air temperature ( C) Outdoor fan speed Low High Indoor air temp.0 C 7 C 4 C Indoor discharge air temperature ( C) Indoor air temp. C 0 C 7 C Outdoor air temperature ( C) Outdoor air temperature ( C) NOTE Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value. Overload prevention operates to protect the air conditioner when outdoor ambient temperature becomes extremely high in heating mode. (Refer to "9-. Overload prevention during heating.") :Points of rating condition Black dots in above charts indicate the following rating conditions. Indoor air temperature 7 C D.B. / 9 C W.B. Heating: Outdoor air temperature 5 C D.B. / 4 C W.B. Cooling: 8 Indoor air temperature 0 C D.B. Outdoor air temperature 7 C D.B. / 6 C W.B.

19 5-. Air Throw Distance Charts Indoor Unit MCAF88R5I Cooling Room air temp. : 7 C Fan speed : High Horizontal distance (m) Axis air velocity (m/s) Vertical distance (m) 4 : Flap angle 0, : Axis air velocity 0 : Flap angle 0, : Axis air velocity 0 Heating Room air temp. : 0 C Fan speed : High Horizontal distance (m) Axis air velocity (m/s) Vertical distance (m) 4 5 : Flap angle 45, : Axis air velocity 45 : Flap angle 60, : Axis air velocity 60 9

20 Indoor Unit MCAF48R5I Cooling Room air temp. : 7 C Fan speed : High Horizontal distance (m) Axis air velocity (m/s) Vertical distance (m) 4 : Flap angle 0, : Axis air velocity 0 : Flap angle 0, : Axis air velocity 0 Heating Room air temp. : 0 C Fan speed : High Horizontal distance (m) Axis air velocity (m/s) Vertical distance (m) 4 5 : Flap angle 45, : Axis air velocity 45 : Flap angle 60, : Axis air velocity 60 0

21 6. ELECTRICAL DATA 6-. Electrical Characteristics Indoor Unit Outdoor Unit Cooling Performance at MCAF88R5I GRF86R5I Rating conditions Running amp. A 0. Power input W Rating conditions: Indoor air temperature: 7 C D.B. / 9 C W.B. Outdoor air temperature: 5 C D.B. Indoor Unit Outdoor Unit Complete Unit Fan Motor Fan Motor + Compressor 0V Single-phase 50Hz 6.7, ,500 Heating Performance at Rating conditions Running amp. A 0. Power input W 4 Rating conditions: Indoor air temperature 0 C D.B. Outdoor air temperature 7 C D.B. / 6 C W.B. Indoor Unit Outdoor Unit Complete Unit Fan Motor Fan Motor + Compressor 0V Single-phase 50Hz 7.,54 7.4,575 Indoor Unit Outdoor Unit MCAF48R5I GRF46R5I Cooling Performance at Rating conditions Running amp. A 0.5 Power input W 55 Rating conditions: Indoor air temperature: 7 C D.B. / 9 C W.B. Outdoor air temperature: 5 C D.B. Indoor Unit Outdoor Unit Complete Unit Fan Motor Fan Motor + Compressor 0V Single-phase 50Hz 0.9,00 0.7,55 Heating Performance at Rating conditions Running amp. A 0.54 Power input W 58 Rating conditions: Indoor air temperature 0 C D.B. Outdoor air temperature 7 C D.B. / 6 C W.B. Indoor Unit Outdoor Unit Complete Unit Fan Motor Fan Motor + Compressor 0V Single-phase 50Hz 0.76,4.,490

22 6-. Electric Wiring Diagrams Indoor Unit MCAF88R5I Outdoor Unit GRF86R5I WARNING To avoid electrical shock hazard, be sure to disconnect power before checking, servicing and/or cleaning any electrical parts. Outdoor Unit : GRF86R5I W W W W W W W W W W W W W CONTROLLER W W W W CM MV MAGNETIC COIL W W W 8FA GRN/YEL RV GRN/YEL FM 4WAY VALVE COIL FAN MOTOR TERMINAL BASE 4 L N N L GND REACTANCE P-CONNECTOR (P) CONNECTOR <RED> BRN BLK OLR OLR0 L L HIC+ HIC+ BD- BD- HIC- HIC- 5A E- SI-A ACIN ACIN DCFM E () T-RUN/TEST RED BLK GRN/YEL BLK POWER SUPPLY GRN/YEL U V W A-TH COIL/OUTDOOR COMP MV RV0 RV COMPRESSOR THERMISTOR BLK BLK 7P-CONNECTOR BLK RED BLU YEL (BLU) BLK BLK (BLU) OUT DOOR THERMISTOR BLK BLK COIL THERMISTOR YEL YEL ORG RED YEL BLK GRY YEL BLU RED BLK BLK BLK P-CONNECTOR RED BLU FERRITE CORE RED BLU COMPRESSOR MOTOR FERRITE CORE P-CONNECTOR OVERLOAD RELAY (OLR) R S T GND Indoor Unit : MCAF88R5I EVAPORATOR GRN/YEL TERMINAL BASE 4 BLK RED FLAP CONNECTOR FLAP MOTOR RED PNK BLU BRN YEL AC AC SI IND LAMP ASSY FLAP 5P() LAMP 0P() RED FM FAN MOTOR RED BLK YEL BLU CONTROLLER ROOM/COIL DCM 4P() 6P(BLU) ION P() 4 4 ROOM THERMISTOR BLK BLK BLK BLK COIL THERMISTOR GRN/YEL E BLK BLK BLK RED HA JEM-A 4P() ION TERMINAL ION ASSY 8FA

23 Indoor Unit Outdoor Unit MCAF48R5I GRF46R5I WARNING To avoid electrical shock hazard, be sure to disconnect power before checking, servicing and/or cleaning any electrical parts. Indoor Unit : MCAF48R5I EVAPORATOR GRN/YEL TERMINAL BASE 4 BLK RED FLAP CONNECTOR FLAP MOTOR RED PNK BLU BRN YEL AC AC SI IND LAMP ASSY Outdoor Unit : GRF46R5I W W U SI-A W W W CONTROLLER W W W W GRN/YEL S/U CW CM MV MAGNETIC COIL FM RV FAN MOTOR 4WAY VALVE COIL TERMINAL BASE 4 L N N L 8FA FLAP 5P() LAMP 0P() RED FM FAN MOTOR RED BLK YEL BLU CONTROLLER ROOM/COIL DCM 4P() 6P(BLU) 4 4 ROOM THERMISTOR BLK BLK BLK BLK COIL THERMISTOR GRN/YEL E HA JEM-A 4P() 4 8FA GND REACTANCE (P) CONNECTOR <RED> P-CONNECTOR<> BRN BRN (P) CONNECTOR <BLK> W W W W W W W W W W W W W HEATER HEATER0 OLR OLR0 L L HIC+ HIC+ BD- BD- HIC- HIC- E- CRANKCASE HEATER V W 5A ACIN ACIN A-TH COIL/OUTDOOR COMP DCFM MV E () T-RUN/TEST RV0 RV OVERLOAD RELAY (OLR) R/V COMPRESSOR MOTOR RED BLK GRN/YEL BLK POWER SUPPLY ION P() 4 4 ION TERMINAL ION ASSY YEL BLK GRY BLK BLK BLK RED

24 7. INSTALLATION INSTRUCTIONS 7-. Installation Site Selection 7--. Indoor Unit WARNING To prevent abnormal heat generation and the possibility of fire, do not place obstacles, enclosures and grilles in front of or surrounding the air conditioner in a way that may block air flow. AVOID: direct sunlight. nearby heat sources that may affect performance of the unit. areas where leakage of flammable gas may be expected. places where large amounts of oil mist exist. DO: select an appropriate position from which every corner of the room can be uniformly cooled. (High on a wall is best.) select a location that will hold the weight of the unit. select a location where tubing and drain hose have the shortest run to the outside. allow room for operation and maintenance as well as unrestricted air flow around the unit. (Fig. ) install the unit within the maximum elevation difference (H) above or below the outdoor unit and within a total tubing length (L) from the outdoor unit as detailed in Table and Fig.. Install the indoor unit more than meter away from any antenna or power lines or connecting wires used for television, radio, telephone, security system, or intercom. Electrical noise from any of these sources may affect operation. 5 cm min. INDOOR UNIT Elevation difference (H) CAUTION Front View Fig. Fig. For stable operation of the air conditioner, do not install wall-mounted type indoor units less than.5 m from floor level. Fig. 5 cm min. Tubing length (L) OUTDOOR UNIT 5 cm min. Indoor unit Minimum height from floor level.5 m Floor level Wall Table Model Max. Allowable Tubing Length at Shipment (m) Limit of Tubing Length (L) (m) Limit of Elevation Difference (H) (m) Required Amount of Additional Refrigerant (g/m)* MCAF88 / * If total tubing length becomes 0 to 0 m, charge additional refrigerant (R40A) by 5 g/m. No additional charge of compressor oil is necessary. 4

25 7--. Outdoor Unit AVOID: heat sources, exhaust fans, etc. (Fig. 4) damp, humid or uneven locations. DO: position the outdoor unit in a protected location where snow will not blow into it. choose a place as cool as possible. choose a place that is well ventilated. allow enough room around the unit for air intake/ exhaust and possible maintenance. (Fig. 5a or 5b) provide a solid base (level concrete pad, concrete block, 0 40 cm or 5 40 cm beams or equal), a minimum of 0 cm or 5 cm above ground level to reduce humidity and protect the unit against possible water damage and decreased service life. (Fig. 5c or 5d) Install cushion rubber under unit's feet to reduce vibration and noise. (Fig. 5e) use lug bolts or equal to bolt down unit, reducing vibration and noise. Install in a location where no antenna of a television or radio exists within meters. Air intake Outdoor unit Hot air (GRF86) Min. 0 cm NO Min. 5 cm Air discharge Min. 40 cm Fig. 4 Valve side Min. 5 cm Fig. 5a Exhaust fan Heat source Obstacle above Air discharge Ground Min. m Min. m Obstacle Min. 0 cm Air intake (GRF86) Air intake Concrete or equal Anchor bolts (4 pcs.) Min. 0 cm Air intake (GRF46) Min. 0 cm Min. 0 cm Air discharge Min. 50 cm Valve side Min. 5 cm Obstacle above Air discharge Min. m Min. m Obstacle About 40 cm About 0 cm Fig. 5b Ground Min. 0 cm Air intake Fig. 5c (GRF46) Air intake Anchor bolts (4 pcs.) Min. 5 cm Concrete or equal Cushion rubber About 40 cm About 5 cm Fig. 5e Fig. 5d 5

26 7-. Recommended Wire Length and Diameter Regulations on wiring diameter differ from locality to locality. For field wiring requirements, please refer to your local electrical codes. Carefully observe these regulations when carrying out the installation. Table lists recommended wire lengths and diameters for power supply systems. NOTE Refer to the wiring system diagram (Fig. 6) for the meaning of (A), (B) and (C) in Table. Table Model Cross-Sectional Area (mm ) (A) Power Supply Wiring Length (m).5mm (B) Power Line (C) Control Line.5mm (m) Fuse or Circuit Breaker Capacity GRF A GRF A WARNING Be sure to comply with local codes on running the wire from the indoor unit to the outdoor unit (size of wire and wiring method, etc.). Each wire must be firmly connected. No wire should be allowed to touch refrigerant tubing, the compressor, or any moving part. WARNING INDOOR UNIT Terminal 4 WIRING SYSTEM DIAGRAM (B) Grounding line Power supply Single-phase 0 to 40VAC 50HZ L N (C) (A) OUTDOOR UNIT Terminal 4 L N To avoid the risk of electrical shock, each air conditioner unit must be grounded. For the installation of a grounding device, please observe local electrical codes. Grounding is necessary, especially for units using inverter circuits, in order to release charged electricity and electrical noise caused by high tension. Otherwise, electrical shock may occur. Place a dedicated ground more than meters away from other grounds and do not have it shared with other electric appliances. Fig. 6 Grounding line CAUTION Be sure to connect the power supply line to the outdoor unit as shown in the wiring diagram. The indoor unit draws its power from the outdoor unit. Do not run wiring for antenna, signal, or power lines of television, radio, stereo, telephone, security system, or intercom any closer than meter from the power cable and wires between the indoor and outdoor units. Electrical noise may affect the operation. 6

27 7-. Remote Control Unit Installation Position The remote control unit can be operated from either a non-fixed position or a wall-mounted position. To ensure that the air conditioner operates correctly, do not install the remote control unit in the following places: In direct sunlight Behind a curtain or other place where it is covered More than 8 m away from the air conditioner In the path of the air conditioner s airstream Where it may become extremely hot or cold Where it may be subject to electrical or magnetic interference Where there is an obstacle between the remote control unit and the air conditioner (since a check signal is sent from the remote control unit every 5 minutes) 7--. Mounting on a Wall Before mounting the remote control unit, press the ON/OFF operation button at the mounting location to make sure that the air conditioner operates from that location. The indoor unit should make a beeping sound to indicate that it has received the signal. Remote control unit mount Mounting screws 4 6 (included) Press Set in place Rear side Hole To prevent loss of the remote control unit, you can connect the remote control unit to the mount by passing a string through the remote control unit and attachment hole. To take out the remote control unit, pull it forward. Fig. 7 7

28 7-4. How to Test Run the Air Conditioner After turning on power to the air conditioner, use the remote controller and follow the steps below to conduct the test run. () Set the remote controller in Test Run mode. (Fig. 8a) a) Press and hold the ION button and the HR. TIMER button. b) Then press and hold the ACL (Reset) button with a pointed object such as the tip of a pen. After 5 seconds, release the ACL button first. c) Then release the ION and HR. TIMER buttons. d) appear and "op-" blinking in the remote controller display area. (Fig. 8b) () Start Cooling mode test run by pressing the ON/OFF operation button of the remote controller. (Fig. 8a) This starts the fan producing uncooled forced air with the 4 indicator lamps (OPERATION lamp, TIMER lamp and QUIET lamp, and ION lamp) on the main unit blinking. (Fig. 8c) After minutes, the system shifts into cooling operation, and cool air will start to be felt. Cool mode test run is unaffected by the room temperature. () Press the ON/OFF operation button of the remote controller again to stop the test run. (Fig. 8a) (4) Finally press the ACL (reset) button of the remote controller to release it from Test Run mode to return to normal mode. (Fig. 8a) " " and "op-" will disappear from the remote controller display area. ION button ON/OFF operation button HR. TIMER button AC (ReLset) button IMPORTANT After the test run is completed, be sure to press the ACL (reset) button to return to normal mode. The air conditioner will not operate correctly if this is not done. Fig. 8a Fig. 8b OPERATION TIMER QUIET ION OPERATION lamp TIMER lamp QUIET lamp ION lamp OPERATION Fig. 8c 8

29 7-5. Remove the Grille to Install the Indoor Unit Basically, these models can be installed and wired without removing the grille. If access to any internal part is needed, follow the steps as given below. How to remove the grille Air intake grille Fig. 9a Grille () Grasp both ends of the air intake grille, and remove it by opening towards the front and pulling towards you. (Fig. 9a) () Remove the screws. (Fig. 9b) () Remove the screw on the right side cover plate and open the cover. (Fig. 0a) (4) Take out the thermistor from the grille. (Fig. 0b) (5) Press the tabs at the top of the grille and the tabs on the front face to separate the grille from the frame. (Fig. a) (6) Pull the grill toward you to remove it. Fig. 9b Thermistor Cover Thermistor How to replace the grille () When installing the grille, place the bottom of the grille into the frame first. (Fig. b) Then insert the tabs on the top of the grille and on the front face into the frame. () Make sure that the grille and frame are firmly fitted together by engaging the tabs. () Attach the thermistor on the grille. (Fig. 0a) (4) Close the cover and replace the screw. (Fig. 0a) (5) Affix the grille with the previously removed screws. (Fig. 9b) (6) Install the air intake grille. (a) Allow the edge of the air intake grille to slide into the top of the indoor unit, and then insert it all the way inside. (Fig. a) (b) Press the bottom right and left corners and center of the air intake grille to attach it to the indoor unit. (Fig. b) Tab Fig. 0a Tab Fig. a Fig. 0b NOTE Attach so that the round pins at the top right and left corners of the air intake grille are inserted into the grooves at the top right and left of the indoor unit. Fig. b Groove Pin Fig. b Fig. a 9

30 8. MAINTENANCE 8-. Address Setting of the Remote Control Unit The address can be set in order to prevent interference between remote controllers when two indoor units are installed near each other. The address is normally set to "A." To set a different address, it is necessary to change the address on the second remote controller. Tab Fig. NOTE Once changed, you cannot restore the original address setting of the air conditioner. () Switch on the power source. () Break the address-setting tab marked "A" on the second remote controller to change the address (Fig. ). When the tab is removed, the adress is automatically set to B (Fig. 4). () Press and hold the remote controller ION button and HR TIMER button. Then, press and hold the ACL (reset) button with a pointed object such as the tip of a pen. After 5 seconds, release ACL button first, then release ION and HR TIMER buttons, "op-" (test run) appears, blinking in the remote controller clock display area. (4) Each time the HR TIMER button is pressed, the display changes as shown below. Press this button times to change the display to "op-7" (address setting). (Fig. 5) Fig. 4 ACL button Test run mode Self-diagnostic mode ION button ON/OFF operation button Address setting mode (5) "op-7" has now been selected for address setting. (6) Press the ON/OFF operation button on the remote controller. (Fig. 5) Check that the "beep" signalreceived sound is heard from the second indoor unit (approximately 5 times). The sound you hear is the signal that the remote controller address has been changed. (7) Finally press the remote controller ACL (reset) button to cancel the blinking "op-7" display. (Fig. 5) Changing of the second remote controller address is now completed. ADDRESS Fig. 5 HR. TIMER button AC (ReLset) button 0

31 8-. Disconnecting and Connecting Positive Connector for Outdoor Unit One of the two types of connectors illustrated at left is used. Their basic structure is the same for each. How to Disconnect Pull the cover upward Hold the resin connector cover, and pull the connector off. You cannot disconnect the connector by pulling the wire since it is locked inside. Always hold the cover to disconnect. (See illustration at left.) For the connector without the resin cover, push the lock in the direction of "" while pulling it off. How to Connect In order to connect, hold the resin cover of the connector and push it in. Confirm the click sound for the inside lock. When the cover is pulled upward, the lock is released with the sequence of and.

32 9. FUNCTIONS 9-. Operation Functions Emergency operation Emergency operation is available when the remote controller malfunctions, has been lost, or otherwise cannot be used. To operate the system, press the OPERATION button, which is also used as the receiver, below the unit display. Each time this button is pressed, the OPERATION lamp changes color to indicate the type of operation. Select the desired type of operation. COOL HEAT STOP (GREEN) (RED) (Lamp Off) The set temperature is C below the detected room temperature in the case of cooling operation, and C above the room temperature in the case of heating operation. The flap and fan speed settings are AUTO. AUTO cooling/heating operation Selecting the operation mode When AUTO mode is selected, the microprocessor calculates the difference between the set temperature and the room temperature, and automatically switches to Cooling or Heating mode. Room temp. Set temp. COOL Room temp. Set temp. HEAT As shown by the example in the figure below, with AUTO cooling / heating operation, the mode changes between Heating and Cooling mode according to changes in the relationship between the current room temperature and the set temperature. Example Example of operation in AUTO mode with the set room temperature at C. Room temp. Zone A SENSOR DRY During DRY operation, the system adjusts the room temperature and fan speed according to the conditions in the room, in order to maintain a comfortable room environment. SENSOR DRY operation DRY operation is as shown in the figure below. Load DRY A The compressor operation frequency varies. The indoor fan operates with /f fluctuation. DRY B The compressor operates at a low operating frequency. The indoor fan operates with /f fluctuation. Monitor COOL zone A zone B zone Conditions are monitored at all times when the room temperature is below 5 C. Monitoring operation takes place when the room temperature is below 5 C, or more than C below the set temperature. When the monitoring range is entered, the compressor stops, and the indoor fan operates with /f fluctuation. NOTE The Sensor Dry operation during the Low Ambient Cooling Mode (outside air temperature:5 C or lower) is as follows. DRY A and DRY B The compressor operates a cycle of minutes ON and 6 minutes OFF repeatedly. Zone B Zone C Set temp. Zone C Zone B Zone A Compressor Operation mode ON OFF ON OFF ON Cooling More than hour Heating Within hour Cooling PAM- control In order to further improve inverter performance, control is switched between PWM control at low operation speeds, and PAM control at high operation speeds, making the most effective use of power.

33 HIGH POWER This function acts to raise the power but keeps the AC system in the same operating mode. This function is set with the HIGH POWER button on the remote controller. (It can be set regardless of the temperature and fan speed settings.) HIGH POWER operation from remote controller The unit operates at maximum output for 0 minutes, regardless of the desired temperature. The fan speed is step above "High." Frequency MAX NIGHT SETBACK When NIGHT SETBACK operation is set, the temperature and fan speed settings will be adjusted automatically to allow comfortable sleep. When NIGHT SETBACK operation is set, " mark" appears on the remote controller. The main unit display lamp also becomes dimmer. COOL and DRY modes When the night setback mode is selected, the air conditioner automatically raises the temperature setting C when 0 minutes have passed after the selection was made, and then another C after another 0 minutes have passed, regardless of the indoor temperature when night setback was selected. This enables you to save energy without sacrificing comfort. This function is convenient when gentle cooling is needed. NOTE 0 When HIGH POWER operation ends, the unit operates at low Hz for 5 minutes, regardless of the thermostat OFF conditions. When in DRY mode, operation is in the cooling zone. Lamp colors OPERATION lamp TIMER lamp QUIET lamp ION lamp Start HEAT operation DRY operation COOL operation FAN operation DEFROSTING operation 0 min. 5 min. End Green Green Green Time Red Orange Green Green Red and Orange alternately Setting temperature Press the NIGHT SETBACK button HEAT mode When the night setback mode is selected, the air conditioner automatically lowers the temperature setting C when 0 minutes have passed after the selection was made, and then another C after another 0 minutes have passed, regardless of the indoor temperature when night setback was selected. This enables you to save energy without sacrificing comfort. This function is convenient when gentle heating is needed. Setting temperature Press the NIGHT SETBACK button C ( F) C ( F) 0 min. 0 min. Time C (4 F) C (4 F) 0 min. 0 min. Time Timer backup Operation stops if there are no operator controls for 5 hours or longer after unit operation switched from OFF to ON by use of ON timer operation.

34 9-. Protective Functions Overload prevention during heating During HEAT operation, the temperature of the indoor heat exchanger is used to control the frequency and lessen the load on the compressor before the protective device is activated. Cold-air prevention during heating During heating, the fan speed is set to "LL" (very low) or stopped. As the temperature of the indoor heat exchanger rises, the fan speed is changed to the set speed. Indoor heat exchanger temperature ( C) Indoor heat exchanger Approx. A High A. Control start 5 At stability of operation B. Control end Approx. 47 a b c d B Set fan speed At start of operation a. Area: Automatic capacity control b. When Point A has been exceeded, the operation frequency is reduced by a certain proportion. c. Area: Frequency increase is prohibited. d. At Point B and below, overload prevention is ended and control is the same as in the a area. Freeze prevention During COOL or DRY operation, freezing is detected and operation is stopped when the temperature of the indoor heat exchanger matches the conditions below.. Freeze-prevention operation is engaged when the temperature of the indoor heat exchanger is below 6 C.. Restart after freeze-prevention operation occurs when the temperature of the indoor heat exchanger reaches 8 C or above. Indoor heat exchanger temperature ( C) 8 6 * A a b c d a. Area: Automatic capacity control b. When the temperature drops below Point A, the operation frequency is reduced by a certain proportion. c. Area: Frequency increase is prohibited. d. When the temperature reaches Point C or above, freezing prevention is ended and control is the same as in the a area. * When the temperature drops to below C (continuously for minutes or longer), the compressor stops. Once the freeze condition is detected, the air conditioner will work less than the maximum frequency until it is turned off. NOTE The Freeze Prevention Control during the Low Ambient Cooling Mode (outside air temperature:5 C or lower) is as follows. The compressor stops when the temperature of indoor heat exchanger becomes less than C. The compressor restarts when the temperature of indoor heat exchanger becomes 8 C or higher. B C LL Stopped NOTE 5 0 Approx. 40 Indoor heat exchanger temperature ( C) The fan speed is forcibly changed to "LL" beginning 0 seconds after the thermostat turns OFF. At stability of operation refers to operation when the room temperature has approached the set temperature. When HEAT operation starts, the indoor fan is stopped until the temperature of the indoor heat exchanger reaches 0 C or higher, or until the room temperature reaches 5 C or higher. Compressor discharge temperature control This function controls the operation frequency to prevent the compressor discharge temperature from rising more than a specified temperature. Compressor discharge temperature ( C) Approx. 0 Approx. 94 A a b c d a. Area: Automatic capacity control. b. When the temperature rises above Point A, the operation frequency is reduced at a specified rate. c. Area: Further frequency increase is prohibited. d. When the temperature falls below Point B, prevention of a rise in frequency is released and the air conditioner operates as in a area. * The compressor will stop if the temperature of the compressor discharge exceeds 0 C due to shortage of gas or other reason. B 4

35 Defrost detection and release Reverse-Cycle Defrosting Outdoor fan ON 4-way valve ON Defrosting Sequence Heating operation Frost sensing Defrost detection occurs in either of the following cases: The temperature of the heat exchanger remains at or below the L line for minutes after the start of HEAT operation. The temperature of the heat exchanger remains at or below the L line for 0 minutes after the start of HEAT operation. L L Outdoor heat exchanger temp. Frosting area Reverse-cycle defrosting operation Compressor minute after it is stopped, compressor is ON. Outdoor fan OFF Indoor fan OFF 4-way valve OFF Operation lamp Repeatedly switches between red and orange illumination. 0 Ambient temp. CT (Peak current cut-off control) This function prevents the circuit breaker or fuse from operating to open the circuit. This function works when electrical current has increased due to an increase in the cooling / heating load, or to a decrease in the power supply voltage. In these cases, operation frequency is reduced or operation is interrupted automatically to control the electrical current for operation. When the cause of the increase in electrical current is rectified, the system will resume operation in the original mode. MCAF88R5I (A) Cooling Dry Heating Peak current cut-off trips.5 Hz down MCAF48R5I Cooling Dry Heating Peak current cut-off trips.5 Hz down NOTE The following three protective actions are available to prevent the compressor from operating with abnormal loads. At that time, they initiate thermo-off (stopping the outdoor unit) of the air conditioner. Mode : Cooling Electrical current setting for COOL operation is used during DEFROST operation. Operation Cut-Off Control in abnormal ambient temperature Cut-off action Low ambient temp. cut-off Thermo-off t : ambient temp Thermo-on t : ambient temp t - C t > -8 C (A) Releasing of defrosting Outdoor heating exchanger temp. is over 0 C. Defrosting operation lasts minutes (maximum). minutes after it is stopped, compressor is ON. 4-way valve is ON. Outdoor fan is ON. Mode : Heating Cut-off action Thermo-off t : ambient temp High ambient temp. cut-off t 5 C Low ambient temp. cut-off t -0 C Thermo-on t : ambient temp t < 4 C t > -6 C NOTE If the air conditioner is turned off during the defrosting cycle, it will continue defrosting and turn itself off after defrosting is completed. 5

36 0. TROUBLESHOOTING 0-. Precautions before Performing Inspection or Repair After checking the self-diagnostics monitor, turn the power OFF before starting inspection or repair. High-capacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an electrical charge (charging voltage DC 0V) even after the power is turned OFF, and some time is required for the charge to dissipate. Be careful not to touch any electrified parts before the controller LED (red) turns OFF. If the outdoor controller is normal, approximately 0 seconds will be required for the charge to dissipate. However, allow at least 5 minutes for the charge to dissipate if there is thought to be any trouble with the outdoor controller. 0-. Method of Self-Diagnostics Follow the procedure below to perform detailed trouble diagnostics. NOTE < Clock display > Test run mode Self-diagnostic mode Address setting mode : If the operation lamp blinks every 0.5 seconds immediately when the power is turned ON, there is an external ROM (OTP data) failure on the indoor circuit board, or a ROM socket insertion problem, or the ROM has not been installed. : The failure mode is stored in memory even when the power is not ON. Follow the procedure below to perform diagnostics. PROCEDURE After turning on power to the air conditioner, use the remote controller and follow the steps below to execute self-diagnostics. Step : Press and hold the remote controller ION button and HR TIMER button. Then, press and hold the ACL (reset) button with a pointed object such as the tip of a pen. After 5 seconds, release ACL button first, then release ION and HR TIMER buttons, "op-" (test run) appears, blinking in the remote controller clock display area. Step : Next, press the HR TIMER button once to change the display from "op-" to "op-" (self-diagnostics). (The display continues to blink.) Step : Finally press the ON/OFF button to engage self-diagnostics mode. The self-diagnostics function utilizes the indicator lamps on the main unit, in combinations of ON lamps, blinking lamps, and OFF lamps, to report the existence of sensor trouble or a protective operation. (The lamps blink or remain ON for 5 seconds, then turn OFF for seconds.) Self-diagnostics is completed when the buzzer sounds short beeps. A maximum of self-diagnostics reports are displayed, for 5 seconds each, beginning with the most recent report. Following this display the lamps turn OFF. In order to view the self-diagnostics results again, press the ON/OFF button again. The lamps remain OFF if no trouble has occurred. <IMPORTANT> After self-diagnostics is completed, be sure to press the ACL (reset) button to return to normal mode. The air conditioner will not operate if this is not done. ION button ON/OFF operation button HR. TIMER button ACL (Reset) button 6

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