AIR-CONDITIONER SERVICE MANUAL (MULTI TYPE) R410A

Transcription

1 FILE NO. A-0 Revision : Jun., 207 SERVICE MANUAL AIR-CONDITIONER (MULTI TYPE) Medium Static Ducted Type MMD- AP0074BH2UL MMD- AP0094BH2UL MMD- AP024BH2UL MMD- AP054BH2UL MMD- AP084BH2UL MMD- AP024BH2UL MMD- AP0244BH2UL MMD- AP0304BH2UL MMD- AP0364BH2UL MMD- AP0424BH2UL MMD- AP0484BH2UL R40A MMD- AP0484BH2UL PRINTED IN JAPAN, Nov., 20 ToMo

2 CONTENTS SAFETY CAUTION SPECIFICATIONS CONSTRUCTION VIEWS (EXTERNAL VIEWS) WIRING DIAGRAM PARTS RATING REFRIGERATIN GCYCLE DIAGRAM CONTROL OUTLINE APPLIED CONTROL AND FUNCTION TROUBLESHOOTING DETACHMENTS P.C. BOARD EXCHANGE PROCEDURES EXPLODED VIEWS AND PARTS LIST

3 SAFETY CAUTION The important contents concerned to the safety are described on the product itself and on this Service Manual. Please read this Service Manual after understanding the described items thoroughly in the following contents (Indications/Illustrated marks), and keep them. The manufacturer shall not assume any liability for the damage caused by not observing the description of this manual. [Explanation of indications] Indication DANGER WARNING CAUTION Explanation Indicates contents assumed that an imminent danger causing a death or serious injury of the repair engineers and the third parties when an incorrect work has been executed. Indicates possibilities assumed that a danger causing a death or serious injury of the repair engineers, the third parties, and the users due to troubles of the product after work when an incorrect work has been executed. Indicates contents assumed that an injury or property damage ( ) may be caused on the repair engineers, the third parties, and the users due to troubles of the product after work when an incorrect work has been executed. Property damage : Enlarged damage concerned to property, furniture, and domestic animal/pet [Explanation of illustrated marks] Mark Explanation Indicates prohibited items (Forbidden items to do) The sentences near an illustrated mark describe the concrete prohibited contents. Indicates mandatory items (Compulsory items to do) The sentences near an illustrated mark describe the concrete mandatory contents. Indicates cautions (Including danger/warning) The sentences or illustration near or in an illustrated mark describe the concrete cautious contents. [Confirmation of warning label on the main ] Confirm that labels are indicated on the specified positions (Refer to the Parts disassembly diagram (Outdoor ).) If removing the label during parts replace, stick it as the original. DANGER Turn off breaker. Execute discharge between terminals. Turn OFF the breaker before removing the front panel and cabinet, otherwise an electric shock is caused by high voltage resulted in a death or injury. During operation, a high voltage with 400V or higher of circuit ( ) at secondary circuit of the high-voltage transformer is applied. If touching a high voltage with the naked hands or body, an electric shock is caused even if using an electric insulator. :# For details, refer to the electric wiring diagram. When removing the front panel or cabinet, execute short-circuit and discharge between high-voltage capacitor terminals. If discharge is not executed, an electric shock is caused by high voltage resulted in a death or injury. After turning off the breaker, high voltage also keeps to apply to the high-voltage capacitor. Do not turn on the breaker under condition that the front panel and cabinet are removed. An electric shock is caused by high voltage resulted in a death or injury. Prohibition 3

4 WARNING Check earth wires. Prohibition of modification. Use specified parts. Do not bring a child close to the equipment. Insulating measures No fire Refrigerant Assembly/Cabling Before troubleshooting or repair work, check the earth wire is connected to the earth terminals of the main, otherwise an electric shock is caused when a leak occurs. If the earth wire is not correctly connected, contact an electric engineer for rework. Do not modify the products. Do not also disassemble or modify the parts. It may cause a fire, electric shock or injury. For spare parts, use those specified ( ). If unspecified parts are used, a fire or electric shock may be caused. : For details, refer to the parts list. Before troubleshooting or repair work, do not bring a third party (a child, etc.) except the repair engineers close to the equipment. It causes an injury with tools or disassembled parts. Please inform the users so that the third party (a child, etc.) does not approach the equipment. Connect the cut-off lead wires with crimp contact, etc, put the closed end side upward and then apply a water-cut method, otherwise a leak or production of fire is caused at the users side. When repairing the refrigerating cycle, take the following measures. ) Be attentive to fire around the cycle. When using a gas stove, etc, be sure to put out fire before work; otherwise the oil mixed with refrigerant gas may catch fire. 2) Do not use a welder in the closed room. When using it without ventilation, carbon monoxide poisoning may be caused. 3) Do not bring inflammables close to the refrigerant cycle, otherwise fire of the welder may catch the inflammables. Check the used refrigerant name and use tools and materials of the parts which match with it. For the products which use R40A refrigerant, the refrigerant name is indicated at a position on the outdoor where is easy to see. To prevent miss-charging, the route of the service port is changed from one of the former R22. Do not useany refru\igerant different from the onespecified for complement or replacement. Otherwise, abnormally high pressuremay be generated in the refrigeration cycle, which may result in a failure or explosion of the product or an injury to your body. For an air conditioner which uses R40A, never use other refrigerant than R40A. For an air conditioner which uses other refrigerant (R22, etc.), never use R40A. If different types of refrigerant are mixed, abnormal high pressure generates in the refrigerating cycle and an injury due to breakage may be caused. Do not charge refrigerant additionally. If charging refrigerant additionally when refrigerant gas leaks, the refrigerant composition in the refrigerating cycle changes resulted in change of air conditioner characteristics or refrigerant over the specified standard amount is charged and an abnormal high pressure is applied to the inside of the refrigerating cycle resulted in cause of breakage or injury. Therefore if the refrigerant gas leaks, recover the refrigerant in the air conditioner, execute vacuuming, and then newly recharge the specified amount of liquid refrigerant. In this time, never charge the refrigerant over the specified amount. When recharging the refrigerant in the refrigerating cycle, do not mix the refrigerant or air other than R40A into the specified refrigerant. If air or others is mixed with the refrigerant, abnormal high pressure generates in the refrigerating cycle resulted in cause of injury due to breakage. After installation work, check the refrigerant gas does not leak. If the refrigerant gas leaks in the room, poisonous gas generates when gas touches to fire such as fan heater, stove or cocking stove though the refrigerant gas itself is innocuous. Never recover the refrigerant into the outdoor. When the equipment is moved or repaired, be sure to recover the refrigerant with recovering device. The refrigerant cannot be recovered in the outdoor ; otherwise a serious accident such as breakage or injury is caused. After repair work, surely assemble the disassembled parts, and connect and lead the removed wires as before. Perform the work so that the cabinet or panel does not catch the inner wires. If incorrect assembly or incorrect wire connection was done, a disaster such as a leak or fire is caused at user s side. 4

5 WARNING Insulator check Ventilation Be attentive to electric shock Compulsion Check after repair After the work has finished, be sure to use an insulation tester set (500V Megger) to check the resistance is 2MΩ or more between the charge section and the non-charge metal section (Earth position). If the resistance value is low, a disaster such as a leak or electric shock is caused at user s side. When the refrigerant gas leaks during work, execute ventilation. If the refrigerant gas touches to a fire, poisonous gas generates. A case of leakage of the refrigerant and the closed room full with gas is dangerous because a shortage of oxygen occurs. Be sure to execute ventilation. When checking the circuit inevitably under condition of the power-on, use rubber gloves and others not to touch to the charging section. If touching to the charging section, an electric shock may be caused. When you access inside of the service panel to repair electric parts, wait for about five minutes after turning off the breaker. Do not start repairing immediately. Otherwise you may get electric shock by touching terminals of high-voltage capacitors. Natural discharge of the capacitor takes about five minutes. When the refrigerant gas leaks, find up the leaked position and repair it surely. If the leaked position cannot be found up and the repair work is interrupted, pump-down and tighten the service valve, otherwise the refrigerant gas may leak into the room. The poisonous gas generates when gas touches to fire such as fan heater, stove or cocking stove though the refrigerant gas itself is innocuous. When installing equipment which includes a large amount of charged refrigerant such as a multi air conditioner in a sub-room, it is necessary that the density does not the limit even if the refrigerant leaks. If the refrigerant leaks and exceeds the limit density, an accident of shortage of oxygen is caused. For the installation/moving/reinstallation work, follow to the Installation Manual. If an incorrect installation is done, a trouble of the refrigerating cycle, water leak, electric shock or fire is caused. After repair work has finished, check there is no trouble. If check is not executed, a fire, electric shock or injury may be caused. For a check, turn off the power breaker. After repair work (installation of front panel and cabinet) has finished, execute a test run to check there is no generation of smoke or abnormal sound. If check is not executed, a fire or an electric shock is caused. Before test run, install the front panel and cabinet. Check after reinstallation Check the following items after reinstallation. ) The earth wire is correctly connected. 2) The power cord is not caught in the product. 3) There is no inclination or unsteadiness and the installation is stable. CAUTION Put on gloves Cooling check Be sure to put on the gloves ( ) and a long sleeved shirt: otherwise an injury may be caused with the parts, etc. ( ) Heavy gloves such as work gloves When the power was turned on, start to work after the equipment has been sufficiently cooled. As temperature of the compressor pipes and others became high due to cooling/heating operation, a burn may be caused. 5

6 New Refrigerant (R40A) This air conditioner adopts a new HFC type refrigerant (R40A) which does not deplete the ozone layer.. Safety Caution Concerned to New Refrigerant The pressure of R40A is high.6 times of that of the former refrigerant (R22). Accompanied with change of refrigerant, the refrigerating oil has been also changed. Therefore, be sure that water, dust, the former refrigerant or the former refrigerating oil is not mixed into the refrigerating cycle of the air conditioner with new refrigerant during installation work or service work. If an incorrect work or incorrect service is performed, there is a possibility to cause a serious accident. Use the tools and materials exclusive to R40A to purpose a safe work. 2. Cautions on Installation/Service ) Do not mix the other refrigerant or refrigerating oil. For the tools exclusive to R40A, shapes of all the joints including the service port differ from those of the former refrigerant in order to prevent mixture of them. 2) As the use pressure of the new refrigerant is high, use material thickness of the pipe and tools which are specified for R40A. 3) In the installation time, use clean pipe materials and work with great attention so that water and others do not mix in because pipes are affected by impurities such as water, oxide scales, oil, etc. Use the clean pipes. Be sure to brazing with flowing nitrogen gas. (Never use gas other than nitrogen gas.) 4) For the earth protection, use a vacuum pump for air purge. 5) R40A refrigerant is azeotropic mixture type refrigerant. Therefore use liquid type to charge the refrigerant. (If using gas for charging, composition of the refrigerant changes and then characteristics of the air conditioner change.) 3. Pipe Materials For the refrigerant pipes, copper pipe and joints are mainly used. It is necessary to select the most appropriate pipes to conform to the standard. Use clean material in which impurities adhere inside of pipe or joint to a minimum. ) Copper pipe <Piping> The pipe thickness, flare finishing size, flare nut and others differ according to a refrigerant type. When using a long copper pipe for R40A, it is recommended to select Copper or copper-base pipe without seam and one with bonded oil amount lbs / 32 0 (40mg / 0m) or less. Also do not use crushed, deformed, discolored (especially inside) pipes. (Impurities cause clogging of expansion valves and capillary tubes.) <Flare nut> Use the flare nuts which are attached to the air conditioner. 2) Joint The flare joint and socket joint are used for joints of the copper pipe. The joints are rarely used for installation of the air conditioner. However clear impurities when using them. 6

7 4. Tools. Required Tools for R40A Mixing of different types of oil may cause a trouble such as generation of sludge, clogging of capillary, etc. Accordingly, the tools to be used are classified into the following three types. ) Tools exclusive for R40A (Those which cannot be used for conventional refrigerant (R22)) 2) Tools exclusive for R40A, but can be also used for conventional refrigerant (R22) 3) Tools commonly used for R40A and for conventional refrigerant (R22) The table below shows the tools exclusive for R40A and their interchangeability. Tools exclusive for R40A (The following tools for R40A are required.) Tools whose specifications are changed for R40A and their interchangeability R40A air conditioner installation Conventional air conditioner installation No. Used tool Usage Whether conven- tional equipment can be used Existence of new equipment for R40A Whether conventional equipment can be used Flare tool Pipe flaring Yes *(Note) Yes Copper pipe gauge for adjusting projection margin Flaring by conventional flare tool Yes *(Note) *(Note) ƒ Torque wrench Tightening of flare nut Yes No No Gauge manifold Charge hose Evacuating, refrigerant charge, run check, etc. Yes No No Vacuum pump adapter Vacuum evacuating Yes No Yes Electronic balance for refrigerant charging Refrigerant charge Yes Yes Yes ˆ Refrigerant cylinder Refrigerant charge Yes No No Leakage detector Gas leakage check Yes No Yes (Note) When flaring is carried out for R40A using the conventional flare tools, adjustment of projection margin is necessary. For this adjustment, a copper pipe gauge, etc. are necessary. General tools (Conventional tools can be used.) In addition to the above exclusive tools, the following equipments which serve also for R22 are necessary as the general tools. ) Vacuum pump. Use vacuum pump by attaching vacuum pump adapter. 7) Screwdriver (+, ) 2) Torque wrench 8) Spanner or Monkey wrench 3) Pipe cutter 9) Hole core drill 4) Reamer 0) Hexagon wrench (Opposite side 4mm) 5) Pipe bender ) Tape measure 6) Level vial 2) Metal saw Also prepare the following equipments for other installation method and run check. ) Clamp meter 3) Insulation resistance tester (Megger) 2) Thermometer 4) Electroscope 7

8 -. Medium Static Ducted Type. SPECIFICATIONS MMD-AP0074BH2UL, AP0094BH2UL, AP024BH2UL, AP054BH2UL, AP084BH2UL Model name MMD- AP0074BH2UL AP0094BH2UL AP024BH2UL AP054BH2UL AP084BH2UL Cooling Capacity kbtu/h Heating Capacity kbtu/h Electrical Power supply 230 V (208/230V) phase 60Hz characteristics Power consumption kw Appearance Zinc hot dipping steel plate Height In 2.6 Unit Width In Dimension Depth In 3.5 Height In 4.6 Packing Width In Depth In 38.4 Total Weight Unit lb Packed lb Heat exchanger Fan Fan Finned tube Centrifugal fan Standard air flow (High/Mid/Low) cfm 32/ 282/ 65 37/ 335/ / 556/ 382 Motor output W External static Factory setting In WG pressure Maximum (*) In WG Connecting Gas side In 3/8" 3/8" 3/8" /2" /2" pipe Liquid side In /4" /4" /4" /4" /4" Drain port (nominal dia.) In VP25(Polyvinyl chloride tube: External Dia.-/4 Internal Dia.) Sound pressure level(high/mid/low) (*2) db(a) 34/30.5/ /30.5/ /32/3 37.5/35.5/ /35.5/29 Option parts Fan guard TCB-IG07BUL TCB-IG5BUL MMD- AP024BH2UL, AP0244BH2UL, AP0304BH2UL, AP0364BH2UL, AP0424BH2UL, AP0484BH2UL Model name MMD- AP024BH2UL AP0244BH2UL AP0304BH2UL AP0364BH2UL AP0424BH2UL AP0484BH2UL Cooling Capacity kbtu/h Heating Capacity kbtu/h Electrical Power supply 230 V (208/230V) phase 60Hz characteristics Power consumption kw Appearance Zinc hot dipping steel plate Height In 2.6 Unit Width In 53.2 Dimension Depth In 3.5 Height In 4.6 Packing Width In 6.7 Depth In 38.4 Total Weight Unit lb 9 Packed lb 35 Heat exchanger Fan Fan Finned tube Centrifugal fan Standard air flow (High/Mid/Low) cfm 788/ 694/ / 953/ / 65/ 87 Motor output W External static Factory setting In WG pressure Maximum (*) In WG Connecting Gas side In 5/8" 5/8" 5/8" 5/8" 5/8" 5/8" pipe Liquid side In 3/8" 3/8" 3/8" 3/8" 3/8" 3/8" Drain port (nominal dia.) In VP25(Polyvinyl chloride tube: External Dia.-/4 Internal Dia.) Sound pressure level(high/mid/low) (*2) db(a) 35/33/3 35/33/3 35/33/3 38/35.5/34.5 4/38.5/36 4/38.5/36 Option parts Fan guard TCB-IG2BUL Note (*) Non attached filter (*2) The actual values in an external opeating environment are generally higher than the indicated values due to the contribution from ambient noise. 8

9 2. CONSTRUCTION VIEWS ³ (EXTERNAL VIEWS) 2-. Medium Static Ducted Type MMD- AP0074BH2UL, MMD- AP0094BH2UL, MMD- AP024BH2UL Hanging bolt pitch24.3±0.3"(66) Unit external dimension 2.7"(550) Air discharge flange outside 3.9"(35.6) 5.5"(40) 2"(50).7"(42) 2.6"(320) 5"(27) 9.5"(240) 6.3"(59.9) 5.8"(47.5) 5.2"(3).6"(4) Outside 8.6"(28.2) Drain pipe connecting port VP25(Polyvinyl chloride tube: External Dia,-/4" Internal Dia," "(25).6"(4) 2"(50) Unit external dimension 3.5"(800) Hanging bolt pitch27.6"(700) 25."(638) 2.2"(57) 2.4"(59) 9.6"(498) 5."(384).2"(30) Air filter slot.7"(44) z.9"(49) Air filter slot Hanging bolt 4-M0.4"(0) (locally procured) Air discharge side Air intake side Refrigerant pipe connecting port Ø3/8"(9.5) (Gas side) Ø"(26) Hole for control wire and remote controller wiring Refrigerant pipe connecting port Ø/4"(6.4) (Liquid side) Ø7/8"(22.2) Hole for power supply cable 2"(300) or less Air intake flange outside 8.6"(47.6) Air discharge side Air filter slot Air intake flange.2"(30) 2.2"(57) 2.7"(550) or less 5.5"(400) * (Min.) 0.7"(27) less or Outside 9.6"(243.2) <Under air intake type> For air intake from under air intake, be sure to attacha separately-sold fan guard. Model name:tcb-ig07bul Z view Drain-up piping 6.3"(59) 9.6"(243.2) 2.6"(320) 3.6"(9) Air intake side Space required for installation and servicing Air discharge Reserve space required for maintenance the indoor and service work. Unit width2.7"(550) Air discharge Electrical control box Electrical control box 3.5"(800) Air filter (locally procured) Air intake 5.9"(50) or more Check port A 7.7"X7.7" (450X450) Ceiling opening size 5.9"(50) or more Check port A 7.7"X7.7" (450X450) Air filter (locally procured) 4"(00) 4"(00) Ceiling Ceiling opening size 23.6"(600) Ceiling 5.9"(50) Ceiling opening size 38.6"(980).2"(30) Drain pan / Drain pump check cover * In the case of under air intake type. : 7.7"(450)(Min.) Notes) * Set check port A for maintaining the electrical control box, filter, drain pump, drain pipe, and refrigerant pipe. * Replace the filter through check port A or B. (If you pull out the filter in the opposite direction of the electrical control box, check port B is required.) Reserve space 40.5"(030) required for attaching or detaching the filter. Otherwise, the filter cannot be replaced. Space required for attaching or detaching the filter 23.6"(600) Electrical control box Space required for attaching or detaching the filter 23.6"(600) * When pulling the refrigerant pipe, drain pipe, etc, avoid the filter port. Otherwise,the filter cannot be replaced. * The indoor is not equipped withan air filter. Procure and install withlocally. * Set a ceiling opening port for maintaining the fan, fan motor, etc. Otherwise, they cannot be maintained. 9

10 MMD- AP054BH2UL, MMD- AP084BH2UL Hanging bolt pitch42 ±0.3"(066) "(25) Unit external dimension 3.5"(800) 2.2"(57) Unit external dimension 39.4"(000).6"(4) Hanging bolt pitch27.6"(700) 2.4"(59) Air discharge flange outside 3.6"(80.6) 5.5"(40) 2"(50).7"(42) 2.6"(320) 5"(27) 9.5"(240) 6.3"(59.9) 5.8"(47.5) 5.2"(3).6"(4) Outside 8.6"(28.2) Drain pipe connecting port VP25(Polyvinyl chloride tube: External Dia,-/4" Internal Dia," 2"(50) 25."(638) 9.6"(498) 5."(384).2"(30) Air filter slot.7"(44) z.9"(49) Air filter slot Hanging bolt 4-M0.4"(0) (locally procured) Air discharge side Air intake side Refrigerant pipe connecting port Ø/2"(2.7) (Gas side) Ø"(26) Hole for control wire and remote controller wiring Refrigerant pipe connecting port Ø/4"(6.4) (Liquid side) Ø7/8"(22.2) Hole for power supply cable 2"(300) or less Air intake flange outside 63.3"(92.6) Air discharge side Air filter slot Air intake flange.2"(30) 2.2"(57) 2.7"(550) or less 5.5"(400) * (Min.) 0.7"(27) less or Outside 9.6"(243.2) <Under air intake type> For air intake from under air intake, be sure to attacha separately-sold fan guard. Model name:tcb-ig5bul Z view Drain-up piping 6.3"(59) 9.6"(243.2) 2.6"(320) 3.6"(9) Air intake side Space required for installation and servicing Air discharge Reserve space required for maintenance the indoor and service work. Unit width39.4"(000) Air discharge Electrical control box Electrical control box 3.5"(800) Air filter (locally procured) Air intake 5.9"(50) or more Check port A 7.7"X7.7" (450X450) Ceiling opening size 5.9"(50) or more Check port A 7.7"X7.7" (450X450) Air filter (locally procured) 4"(00) 4"(00) Ceiling Ceiling opening size 4.3"(050) Ceiling 5.9"(50) Ceiling opening size 38.6"(980).2"(30) Drain pan / Drain pump check cover * In the case of under air intake type. : 7.7"(450)(Min.) Notes) * Set check port A for maintaining the electrical control box, filter, drain pump, drain pipe, and refrigerant pipe. * Replace the filter through check port A or B. (If you pull out the filter in the opposite direction of the electrical control box, check port B is required.) Reserve space 40.5"(030) required for attaching or detaching the filter. Otherwise, the filter cannot be replaced. Space required for attaching or detaching the filter 23.6"(600) Electrical control box Space required for attaching or detaching the filter 23.6"(600) * When pulling the refrigerant pipe, drain pipe, etc, avoid the filter port. Otherwise,the filter cannot be replaced. * The indoor is not equipped withan air filter. Procure and install withlocally. * Set a ceiling opening port for maintaining the fan, fan motor, etc. Otherwise, they cannot be maintained. 0

11 MMD- AP024BH2UL, MMD- AP0244BH2UL, MMD- AP0304BH2UL, MMD- AP0364BH2UL MMD- AP0424BH2UL, MMD- AP0484BH2UL Hanging bolt pitch 55.7±0.3"(46) Unit external dimension 53.2"(350) Drain pipe connecting port VP25(Polyvinyl chloride tube: External Dia,-/4" Internal Dia," "(25).6"(4) Unit external dimension 3.5"(800) Hanging bolt pitch 27.6"(700) 2.2"(57) 2.4"(59) Air discharge flange outside 45.4"(5.6) 5.5"(40) 2"(50) 25."(638) 9.6"(498) 5."(384).2"(30) Air filter slot 2"(50).7"(42) 5"(27) 9.5"(240) 2.6"(320) 6.3"(59.9) 5.8"(47.5) 5.2"(3).6"(4) Air filter slot.7"(44).9"(49) Outside 8.6"(28.2) Hanging bolt 4-M0.4"(0) (locally procured) Air discharge side Air intake side Refrigerant pipe connecting port Ø5/8"(5.9) (Gas side) Ø"(26) Hole for control wire and remote controller wiring z Refrigerant pipe connecting port Ø3/8"(9.5) (Liquid side) Ø7/8"(22.2) Hole for power supply cable <Under air intake type> For air intake from under air intake, be sure to attach a separately-sold fan guard. Model name:tcb-ig2bul 2"(300) or less Air intake flange outside 50."(27.6) Air discharge side Air filter slot Air intake flange.2"(30) 2.2"(57) 2.7"(550) or less 0.7"(27) or less Outside 9.6"(243.2) Drain-up piping Z view 9.6"(243.2) 2.6"(320) 3.6"(9) Air intake side 6.3"(59) Ceiling Space required for installation and servicing Reserve space required for maintenance the indoor and service work. Electrical control box Electrical Unit width 53.2"(350) control box 3.5"(800) Air discharge Ceiling opening size 55."(400) Ceiling 5.9"(50) Ceiling opening size 38.6"(980) Air filter (locally procured).2"(30) Air intake Drain pan / Drain pump check cover * In the case of under air intake type. : 7.7"(450)(Min.) Notes) * Set check port A for maintaining the electrical control box, filter, drain pump, drain pipe, and refrigerant pipe. * Replace the filter through check port A or B. (If you pull out the filter in the opposite direction of the electrical control box, check port B is required.) Reserve space 40.5"(030) required for attaching or detaching the filter. Otherwise, the filter cannot be replaced. 5.9"(50) or more Air discharge Electrical control box Ceiling opening size 5.9"(50) or more Air filter (locally procured) 5.5"(400) (Min.) * 4"(00) 4"(00) Check port A 7.7"X7.7" (450X450) Space required for attaching or detaching the filter 40.5"(030) Check port A 7.7"X7.7" (450X450) Space required for attaching or detaching the filter 40.5"(030) * When pulling the refrigerant pipe, drain pipe, etc, avoid the filter port. Otherwise,the filter cannot be replaced. * The indoor is not equipped with an air filter. Procure and install with locally. * Set a ceiling opening port for maintaining the fan, fan motor, etc. Otherwise, they cannot be maintained.

12 3. WIRING DIAGRAM Indoor Earth screw L L2 TB0 L High voltage Field Power Supply 208/ Symbol Parts Name CN** Connector DM Drain Pump Motor F30 Fuse FM Fan Motor FS Float Switch L Reactor PMV Pulse Motor Valve RY Relay TA Indoor temp sensor TB0,02 Terminal Block TC,2,TCJ Temp sensor RED WHI BLK FM MS 3~ PMV M 6 COLOR IDENTIFICATION RED : RED WHI : WHITE YEL : YELLOW BLU : BLUE BLK : BLACK GRY : GRAY BRW : BROWN GRN : GREEN CN67 (BLK) 3 CN309 (YEL) 3 F30 T6.3A U 250V~ + CN33(WHI) CN20 (WHI) Power supply circuit CN82(BLU) Control P.C. board for Indoor (MCC-50) CN4 (BLU) CN4 (BLU) CN00 (BRW) CN0 (BLK) t t TC TC2 TB02 UU2 UU2 A B A B Low voltage BLK WHI 2 CN00 (RED) 3 BLU BLU RELAY BOARD (MCC-43) 3 5 RED YEL BRW 6 2 RY M DM 5 RED 7 8 BLK BLU BLU FS CN00 (GRN) CN80 (GRN) 2 3 CN23 (WHI) 2 (EMG) CN32 (WHI) 2 (FAN DRIVE) CN6(YEL) (T0) CN60(WHI) (OPTION) CN02 (RED) CN04 (WHI) CN8(BLK) (FLEX) 2 2 t t TCJ TA Maybe Outdoor or Indoor WiredRemote Controller (Soldseparately) Adapter for Wireless Remote Controller (Sold separately). Broken line indicate the wiring at site. Long dashed short dashed line indicate the accessories. 2. indicates the terminal block. indicates the connection terminal. indicates the connector on the control P.C. board. 3. indicates the protection ground. 4. indicates the control P.C. board. 2

13 4. PARTS RATING Model MMD-AP 0074BH2UL 0094BH2UL 024BH2UL 054BH2UL 084BH2UL Fan motor MF-240U50-2A MF-240U50-A Drain pump motor Float switch Pulse motor ADP-406 FS EFM-MD2TF- Pulse motor valve EFM-25YGTF- EFM-40YGTF- Reactor TA sensor TC sensor TC2 sensor TCJ sensor CH-43-2Z-T Lead wire length : 24.3 in (68mm) Ø4, Lead wire length : 47.2 in (200mm), Vinyl tube (Blue) Ø6, Lead wire length : 47.2 in (200mm), Vinyl tube (Black) Ø6, Lead wire length : 47.2 in (200mm), Vinyl tube (Red) Model Fan motor Drain pump motor Float switch Pulse motor MMD-AP 024BH2UL 0244BH2UL 0304BH2UL 0364BH2UL 0424BH2UL 0484BH2UL MF-240U50-2A ADP-406 FS EFM-MD2TF- Pulse motor valve EFM-40YGTF-2 EFM-60YGTF- Reactor TA sensor TC sensor TC2 sensor TCJ sensor CH-43-2Z-T Lead wire length : 24.3 in (68mm) Ø4, Lead wire length : 47.2 in (200mm), Vinyl tube (Blue) Ø6, Lead wire length : 47.2 in (200mm), Vinyl tube (Black) Ø6, Lead wire length : 47.2 in (200mm), Vinyl tube (Red) 3

14 5. REFRIGERATING CYCLE DIAGRAM Liquid side Gas side Strainer Capillary tube Air heat exchanger at indoor side Pulse Motor Valve (PMV) Sensor (TC2) Strainer Sensor (TCJ) Fan Sensor (TC) Sensor (TA) M Fan motor Functional part name Functional outline Pulse Motor Valve Temp. sensor PMV. TA 2. TC 3. TC2 4. TCJ (Connector CN082 (6P): Blue) ) Controls super heat in cooling operation 2) Controls under cool in heating operation 3) Recovers refrigerant oil in cooling operation 4) Recovers refrigerant oil in heating operation (Connector CN04 (2P): White) ) Detects indoor suction temperature (Connector CN00 (3P): Brown) ) Controls PMV super heat in cooling operation (Connector CN0 (2P): Blue) ) Controls PMV under cool in heating operation (Connector CN02 (2P): Yellow) ) Controls PMV super heat in cooling operation 4

15 6. CONTROL OUTLINE No. Item Outline of specifications Remarks When power supply is reset ) Distinction of outdoor When the power supply is reset, the outdoors are distinguished and the control is selected according to the distinguished result. 2) Setting of indoor fan speed and existence of air direction adjustment Based on EEPROM data, select setting of the indoor fan speed and the existence of air direction adjustment. 3) If resetting the power supply during occurrence of a trouble, the check code is once cleared. After ON/OFF button of the remote controller was pushed and the operation was resumed, if the abnormal status continues, the check code is again displayed on the remote controller. Air speed (rpm)/ Air direction adjustment 2 Operation mode selection ) Based on the operation mode selecting command from the remote controller, the operation mode is selected. Remote controller command STOP FAN COOL HEAT Control outline Air conditioner stops. Fan operation Cooling operation Heating operation 3 Room temp. control ) Adjustment range: Remote controller setup temperature ( F [ C] ) COOL/DRY HEAT Wired type 64 F [8 C] to 84 F [29 C] 64 F [8 C] to 84 C [29 C] Wireless type 64 F [8 C] 86 C to [30 C] 6 F [6 C] to 86 F [30 C] 2) Using the Item code 06, the setup temperature in heating operation can be corrected. Setup data Setup temp. Correction Setting at shipment F +3.6 F +7.2 F +0.8 F [+0 C] [+2 C] [+4 C] [+6 C] Shift of suction temperature in heating operation Except while sensor of the remote controller is controlled (Code No. [32], 000 ) Setup data 2 5

16 No. Item Outline of specifications Remarks 4 Automatic capacity control ) Based on the difference between Ta and Ts, the operation capacity is determined by the outdoor. Ta F ( C) +3.6 (+2) COOL SD Ta F ( C) +.8 (+) +.8 (+) SB S9 Ts Ts S7 S5.8 ( ).8 ( ) S3 S0 3.6 ( 2) HEAT S3 S0 S5 S7 S9 SB SD SF Ts: Setup temp. Ta: Room temp. 5 Air speed selection ) Operation with (HH), (H), (L) or [AUTO] mode is carried out by the command from the remote controller. 2) When the air speed mode [AUTO] is selected, the air speed varies by the difference between Ta and Ts. HH > H+ > H > L+ > L > UL <COOL> Ta F ( C) +5.4 (+3.0) +4.5 (+2.5) +3.6 (+2.0) +2.7 (+.5) +.8 (+.0) +0.9 (+0.5) Tsc 0.9 ( 0.5) HH <HH> H+ <HH> H <HH> L+ <H+> L <H> L <H> L <L+> A B C D E F G < > : Indicate automatic cooling. Controlling operation in case when thermo of remote controller works is same as a case when thermo of the body works. If the air speed has been changed once, it is not changed for 3 minutes. However when the air volume is exchanged, the air speed changes. When cooling operation has started, select a downward slope for the air speed, that is, the high position. If the temperature is just on the difference boundary, the air speed does not change. Code No : Body thermo. (Main ) 000: Remote controller thermo. 6

17 No. Item Outline of specifications Remarks 5 Air speed selection (Continued) <HEAT> Ta F ( C) ( 0.9).8 [( 0.5).0] (0) Tsh (+0.9) +.8 [(+0.5) +.0] (+.8) +3.6 [(+.0) +2.0] (+2.7) +5.4 [(+.5) +3.0] (+3.6) +7.2 [(+2.0) +4.0] L <L+> L+ <H> H <H+> H+ <HH> HH <HH> E D C B A < > : Indicate automatic heating. Body thermostat works. Remote controller thermostat works. Value in the parentheses indicates one when thermostat of the remote controller works. Value without parentheses indicates one when thermostat of the body works. If the air speed has been changed once, it is not changed for minute. However when the air speed exchanged, the air speed changes. When heating operation has started, select an upward slope for the air speed, that is, the high position. If the temperature is just on the difference boundary, the air speed does not change. In Tc2 40 F[60 C], the air speed increases by step. Tc2: Indoor heat exchanger sensor temperature 6 Prevention of cold air discharge. In heating operation, the higher temperature of TC2 sensor and TCJ sensor is compared with temperature of TC sensor and then the lower temperature is used to set the upper limit of the fan tap. When B zone has continued for 6 minutes, the operation shifts to C zone. In defrost time, the control point is set to +0.8 F[6 C]. ITCJ: Temperature of indoor heat exchanger sensor In D and E zones, priority is given to remote controller air speed setup. In A zone is displayed. F ( C) 90 (32) 86 (30) 82 (28) 75 (26) 68 (20) 6 (6) D C E B A A zone: OFF B zone: Over 72 F (26 C), below 82 F (28 C), ULTRA LOW (LL) C zone: Over 82 F (28 C), below 86 F (30 C), LOW (L) D zone: Over 86 F (30 C), below 90 F (32 C), MED (H) E zone: HIGH (HH) 7

18 No. Item Outline of specifications Remarks 7 Freeze prevention control (Low temp. release). In all cooling operation, the air conditioner operates as de-scribed below based upon temp. detected by TC, TC2 and TCJ sensors. When J zone is detected for 5 minutes, the thermostat is forcedly off. In K zone, the timer count is interrupted, and held. When I zone is detected, the timer is cleared and the operation returns to the normal operation. If J zone continues, operation of the indoor fan in LOW mode continues until it reaches the I zone. It is reset when the following conditions are satisfied. Reset conditions ) TC > 54 F [2 C] and TC2 > 54 F [2 C] and TCJ > 54 F [2 C]. 2) 20 minutes passed after stop. TC: Temperature of indoor heat exchanger sensor F ( C) P Q J I K a P Q TC 50 F [4 F] 0 C [5 C] 32 F [0 C] TC2, TCJ 4 F [ 0 C] 7 F [ 4 C] ( ) value: When the power supply is turned on, the Forced thermo becomes OFF if the temperature is less than this indicated temperature. 2. In all cooling operation, the air conditioner operates as described below based upon temp. detected by TC2 and TCJ sensors. When M zone is detected for 30 minutes, the thermostat is forcedly off. In N zone, the timer count is interrupted and held. When shifting to M zone again, the timer count restarts and continues. If L zone is detected, the timer is cleared and the operation returns to normal operation. Reset conditions ) TC > 54 F [2 C] and TC2 > 54 F [2 C] and TCJ > 54 F [2 C]. 2) 20 minutes passed after stop. F ( C) P2 Q2 L N M P2 Q2 TC2, TCJ 4 F [5 C] 28 F [ 2.0 C] In a Model without TC2, TC2 is not judged. 8 Recovery control for cooling oil (Refrigerant) The indoor which is under STOP/Thermo-OFF status or which operates in [FAN] mode performs the following controls when it received the cooling oil (Refrigerant) recovery signal from the outdoor. ) Opens PMV of the indoor with a constant opening degree. 2) Operates the drain pump for approx. minute during recovery control and after finish of control. Recovery operation is usually performed every 2 hours 5 minuts. 8

19 No. Item Outline of specifications Remarks 9 Recovery control for heating refrigerant (Oil) The indoor which is under STOP/Thermo-OFF status or which operates in [FAN] mode performs the following controls when it received the heating refrigerant (Oil) recovery signal from the outdoor. ) Opens PMV of the indoor with a constant opening degree. 2) Detects temperature of TC2 and then closes PMV. The indoor which is under thermo-off (COOL) status or which operates in [FAN] mode stops the indoor fan and displays [READY ]. Recovery operation is usually performed every hour. (When there is even indoor which the thermo is off) 0 Compensation control for short intermittent operation ) For 3 minutes after start of operation, the operation is forcedly continued even if the enters in Thermo-OFF condition. 2) However the thermostat is OFF giving prior to COOL/HEAT selection, READY for operation and protective control. Usually the priority is given to 5 minutes at outdoor controller side. Drain pump control ) In cooling operation, this control anytime operates the drain pump. 2) During operation of the drain pump, if the float switch operates, the drain pump continuously operates and a check code is issued. 3) During stop status of the drain pump, if the float switch operates, the thermostat is forcedly off and this control operates the drain pump. After continuous operation of the float switch for approx. 5 minutes, this control stops the operation and a check code is issued. Check Code [P0] 2 Display of filter sign [ ] Separately set type TCB-AX2UL is prepared. ) The filter sign is displayed with LC by sending the filter-reset signal to the remote controller when the specified time (50H/2500H) elapsed as a result of integration of the operation time of the indoor fan. 2) The integrated timer is cleared when the filter-reset signal is received from the remote controller. In this time, if the specified time elapsed, the counted time is reset and the LC display is deleted. [ FILTER] goes on. Filter time 2500H 9

20 No. Item Outline of specifications Remarks 3 Display of [READY] [HEAT READY] < READY> Displayed on the remote controller ) When the following check codes are indicated Open phase of power supply wiring [P05] was detected. There is an indoor that detected the indoor overflow [P0]. There is an indoor that detected the interlock alarm [L30]. 2) During Force Thermo-OFF [COOL/DRY] operation is unavailable because the other indoor operates with [HEAT] mode. [HEAT] operation is unavailable because COOL priority (SW-bit of the Outdoor I/F P. C. board is ON) is set and the other indoor operates with [COOL/DRY] mode. 3) The above indoor s that cannot operate stay in Thermo-OFF status. 4) The indoor fan stops because the system performs [Recovery operation for heating refrigerant (Oil)]. <READY > display No display for wireless type remote controller <HEAT READY> Displayed on the remote controller. Normal thermo. OFF During heating, the indoor goes thermo OFF as the heating temperature setting is reached. 2. During heating, the fan rotates at a breeze speed (UL or lower) or remains stationary to prevent cold air from being discharged (including defrosting operation). 3. Forced thermo OFF HEAT operation is unavailable because at least one indoor is operating in COOL/DRY mode under priority cooling setting (bit of SW on outdoor I/FP.C. board ON). <HEAT READY > display 4 Selection of central control mode ) Selection of the contents that can be operated by the remote controller at the indoor side is possible according to setting at the central controller side. 2) Setting contents In case of TCC-LINK central control Operation from TCC-LINK central control Individual [Central ] [Central 2] [Central 3] [Central 4] Operation on RBC-AMT32UL ON/OFF Operation Timer Temp. Air speed Air direction setting selection setting setting setting setting On RBC-AMT32UL [Central control] display ( : Operation possible : Operation impossible) 20

21 No. Item Outline of specifications Remarks 5 DC motor ) When the fan stator, positioning is performed for the starter and the rotor. (Vibrate slightly) 2) DC motor operates according to the command from the indoor controller. (Note) If the fan rotates by entry of outside air, etc while the air conditioner stopped, the indoor may operate as the fan motor stops. (Note) If the fan lock was detected, the operation of the indoor stops and the is displayed. (Note) If the incorrect duct design was found during installation work or you carelessly opened the service panel (drain pump) of the main during operation, the check code [P2] is output and the motor stops. Check code [P2] 6 Save operation ) The save operation starts when remotecontroller is turned on. SAVE button on the 2) While the save operation is performed, segment goes on the screen of the wired remote controller. 3) The request capacity ratio is restricted to approx. 75% during save operation. 4) If the save operation was validated, the contents are held during the operation stop, the operation mode change and the resetting of power supply. Therefore the operation at the next time also will be activated with Save operation is valid. 2

22 7. APPLIED CONTROL AND FUNCTION 7-. Indoor Controller Block Diagram 7--. When Main (Simple) Wired Remote Controller Connected Main (Simple) wired remote controller (Up to 2 sets) Display part LCD Display part LED CPU Function setup Key switch DC5V Power circuit Remote controller communication circuit Indoor # A B #2 #3 A B A B Main P.C. board (MCC-50) DC20V Remote controller communication circuit Sub P.C. board (MCC-43) Driver Central control communication circuit DC5V CPU EEPROM TA sensor TC sensor TC2 sensor Same as left Same as left Driver TCJ sensor Drain pump Louver motor Start/Alarm/Ready Thermostat ON COOL/HEAT/FAN Outside output DC2V Fan motor control circuit HA Float input BUS Communication circuit L L2 UU2 L L2 UU2 Indoor fan motor DC280V Power circuit AC synchronous signal input circuit Power supply Power supply L L2 U U2 Outdoor Outdoor Max. 8 s are connectable. L L2 Power supply 208/ U2 U Outdoor 22

23 7--2. When Wireless Remote Controller Kit Connected Indoor # Drain pump Louver motor Indoor fan motor Sub P.C. board (MCC-43) Driver DC280V Main P.C. board (MCC-50) DC20V DC5V A B #2 A B #3 A B Wireless remote controller kit Remote controller communication circuit Central control communication circuit CPU EEPROM TA sensor TC sensor TC2 sensor Power supply circuit DC5V Buzzer Remote controller communication circuit CPU Sensor P.C. board Emergency operation SW Function setting SW Sensor circuit Display LED Sameas left Sameas left Driver TCJ sensor Start/Alarm/Ready Thermostat ON COOL/HEAT/FAN Outside output HA Float input DC2V Fan motor control circuit BUS Communication circuit U U2 U U2 L L2 L L2 Power circuit AC synchronous signal input circuit L L2 U U2 Power source Outdoor Power source Outdoor Power source 208/ Indoor/outdoor communication U U2 Outdoor Up to 8 s can be connected. 23

24 7--3. When Both Wired (Simple) Remote Controller and Wireless Remote Controller Kit Connected Indoor # Drain pump Louver motor Indoor fan motor Main (Simple) wired remote controller (up to 2 s) Display LCD Display LED EEPROM MCU Function setting Key switch Remote controller communication circuit DC5V Power supply circuit Sub P.C. board (MCC-43) Driver Main P.C. board (MCC-50) DC20V DC5V A B #2 A B #3 A B Remote controller communication circuit Central control communication circuit CPU EEPROM TA sensor TC sensor TC2 sensor Power supply circuit DC5V Buzzer Wireless remote controller kit Remote controller communication circuit MCU Sensor P.C. board Emergency operation SW Function setting SW Sensor circuit Display LED Driver TCJ sensor Sameas left Sameas left Start/Alarm/Ready Thermostat ON COOL/HEAT/FAN Outside output HA Float input DC280V Power circuit DC2V Fan motor control circuit AC synchronous signal input circuit BUS Communication circuit U U2 L L2 U U2 L L2 L L2 Power source 208/ U U2 Indoor/outdoor communication U U2 Outdoor Power source Outdoor Power source Outdoor Up to 8 s can be connected. 24

25 7--4. Indoor Printed Circuit Board MCC-50 TC2 sensor CN0, DC 5V TCJ sensor CN02, DC 5V Microcomputer operation LED D02 TC sensor CN00, DC5V Power supply CN67 HA (T0) CN6, DC 2V Option output CN60, DC 2V CHK CN7, DC 5V Drain pump power supply CN309 AC 208/230V DISP CN72, DC 5V Flout input CN80, DC 2V EXCT CN73, DC 5V Indoor/Outdoor communication CN40 Remote controller power LED D203 TA sensor CN04, DC 5V Remote controller CN4, DC 20V PMV output CN82, DC 2V DC fan input/output CN20 Fan drive CN32, DC 2V Drain pump drive CN33, DC 20V External input CN23, DC 5V 25

26 P.C. Board Optional Switch/Connector Specifications Function Connector No. Pin No. Specifications Remarks External static pressure SW0 SW02 Bit Bit 2 Bit Bit 2 No use Input No use Input Turn the switch to ON, when using the external static pressure function. SW0 <Bit 2> SW02 <Bit 2> External static pressure OFF ON OFF ON OFF OFF ON ON psi (55 Pa) 0.03 psi (Default) (90 Pa) 0.07 psi (20 Pa) psi (40 Pa) Fan output CN32 2 DC2 V Output Setup at shipment: Linked operation of ON with operation of indoor and OFF with stop * The setup of single operation by FAN button on remote controller is executed from remote controller. (DN = 3) Start / stop input Start / stop input for HA (J0: In place / Removed = Pulse input (factory default) / Step input) 2 0 V (COM) HA CN6 3 4 Remote controller disabling input In-operation output Enables / disables start / stop control via remote controller ON during operation (HA answerback signal) 5 DC 2 V (COM) 6 Alarm output ON while alarm ON DC2 V (COM) 2 Defrost output ON during defrosting of outdoor 3 Thermo-ON output ON when Real thermo. ON (Comp. ON) Optional output CN60 4 Cooling output ON when operation mode is cooling line (Cool, Dry, Cooing/Heating AUTO cooling) 5 Heating output ON when operation mode is heating line (Heat, Cooling/Heating AUTO heating) 6 Fan output ON when indoor fan is ON External input CN23 2 DC5 V (COM) External input Generates test code L30 and automatically shuts down air conditioner ( only if condition presists for minute) (DN:2A = 2, at shipment from factory) CHK Operation check CN7 2 Check mode input 0 V This check is used for operation check of indoor. (The specified operation such as indoor fan H, drain pump ON, etc. is executed without communication with outdoor or remote controller.) DISP Display mode CN72 2 Display mode input 0 V Display mode, communication is enabled by indoor and remote controller only. (When power supply is turned on.) Timer short (Usual) EXCT Demand CN73 2 Demand input 0 V Indoor forced thermo-off operation 26

27 7-2. Functions at test run Cooling/Heating test run check The test run for cooling/heating can be performed from either indoor remote controller or outdoor interface P.C. board.. Start/Finish operation of test run Test run from indoor remote controller Wired remote controller: Refer to the below item of Test run of the wired remote controller. Wireless remote controller: Refer to the next page item of Test run of the wireless remote controller. In case of wired remote controller <RBC-AMT32UL> TEMP. TIMER SET TIME FAN SAVE ON / OFF MODE VENT 2, 4 3, 5 FILTER RESET TEST SET CL SWING/FIX UNIT LOUVER Procedure Operation contents Push [TEST] button for 4 seconds or more. [TEST] is displayed at the display part and the mode enters in TEST mode. TEST Push [ON/OFF] button. Change the mode from [COOL] to [HEAT] using [MODE] button. Do not use [MODE] button for other mode except [COOL]/[HEAT] modes. The temperature cannot be adjusted during test run. The detection is performed as usual. After test run, push [ON/OFF] button to stop the operation. (Display on the display part is same to that in Procedure.) TEST 5 Push [TEST] button to clear the TEST mode. ([TEST] display in the display part disappears and status becomes the normal stop status.) Note) The test run returns to the normal operation after 60 minutes. 27

28 <In case of wireless remote controller (TCB-AX2UL)> Procedure 2 Turn on power of the air conditioner. Description The operation is not accepted for 5 minutes when power has been turned on at first time after installation, and minute when power has been turned on at the next time and after. After the specified time has passed, perform a test operation. Push [Start/Stop] button and change the operation mode to [COOL] or [HEAT] with [Mode] button. Then change the fan speed to [High] using [Fan] button. Test cooling operation Test heating operation Set temperature to [64 F (8 C)] using [Temperature set] button. After checking the receiving sound Pi, immediately push [Temperature set] button to set to [66 F (9 C)] After checking the receiving sound Pi, immediately push [Temperature set] button to set to [64 F (8 C)]. Set temperature to [86 F (30 C)] using [Temperature set] button. After checking the receiving sound Pi, immediately push [Temperature set] button to set to [84 F (29 C)]. After checking the receiving sound Pi, immediately push [Temperature set] button to set to [86 F (30 C)]. 6 7 Then repeat the procedure After approx. 0 seconds, all the display lamps on the sensor part of wireless remote controller, [Operation] (Green), [Timer] (Green), and [Ready] (Yellow) flash and the air conditioner starts operation. If the lamps do not flash, repeat the procedure 2 and after. After the test operation, push [Start/Stop] button to stop the operation. Be sure to set the air speed to [High] 2 3, 4, 5, 6 2, 7 28

29 Check function for operation of indoor (Functions at indoor side) This function is provided to check the operation of the indoor singly without communication with the remote controller or the outdoor. This function can be used regardless of operation or stop of the system. However, if using this function for a long time, a trouble of the equipment may be caused. Limit using this function within several minutes. [How to operate] ) Short-circuit CHK pin (CN7 on the indoor P.C. board). The operation mode differs according to the indoor status in that time. Normal time: Both float SW and fan motor are normal. Abnormal time: Either one of float SW or fan motor is abnormal. 2) Restricted to the normal time, if short-circuiting DISP pin (CN72 on the indoor P.C. board) in addition to short-circuit of CHK pin (CN7 on the indoor P.C. board), the minimum opening degree (30pls) can be set to the indoor PMV only. When open DISP pin, the maximum opening degree (500pls) can be obtained again. [How to clear] Open CHK pin. While the system is operating, it stops once but automatically returns to operation after several minutes. Short-circuit of CHK pin(cn7) DISP pin open(cn7) Normal time DISP pin short circuit(cn7) Abnormal time Fan motor Indoor PMV ( ) Drain pump Communication P.C. board LED (H) (H) Stop Max. opening degree (500pls) Min. opening degree (30pls) Min. opening degree (30pls) ON ON ON All ignored All ignored All ignored Lights Lights Flashes 29

30 7-3. Method to Set Indoor Unit Function DN Code (When performing this task, be sure to use a wired remote controller.) <Procedure> To be performed only when system at rest Push the + + buttons simultaneously and hold for at least 4 seconds. The No. displayed first is the address of the header indoor in group control. Then the fan and louver of the selected indoor move. 2 UNIT LOUVER Each time the Select side of the button is pushed, one of the indoor Nos. under group control is displayed in turn. Then the fan of the selected indoor move. 3 Use the button to select the CODE No. (DN code) of the desired function. 4 Use the button to select the desired SET DATA associated with the selected function. 5 Push the button. (The display changes from flashing to steady.) To change the selected indoor, go back to step 2. To change the selected function, go back to step 3. 6 When the button is pushed, the system returns to normal off state. 30

31 Function CODE No. (DN Code) Table (Includes All Functions Needed to Perform Applied Control on Site) DN Item Descrip tion At sh ipment d 0F 0 Filter display delay timer 0000: None 0002: 2500H 0004: 0000H 000: 50H 0003: 5000H Dirty state of filter 0000: Standard 000: High degree of dirt (Half of standard time) Central control address 000: No. 0099: Unfixed Specific indoor priority Heating temp shift Existence of [AUTO] mode According to type 0000: Standard to 0064: No : Unfixed 0000: No priority 000: Priority 0000: No priority 0000: No shift 0002: +2 C(+3.6 F) to 000: + C(+.8 F) 000: +0 C(+8 F) (Up to +6 recommended) 0000: Provided 000: Not provided (Automatic selection from connected outdoor ) Cooling only 0000: Heat pump 000: Cooling only (No display of [AUTO] [HEAT]) Type 0004: Medium static ducted type 0002: +2 C(+3.6 F) (Floor type 0000: 0 C) 000: Not provided 0000: Heat pump Indoor capacity 0000: Unfixed 000 to 0034 According to capacity type 2 Line address 000: No. to 0030: No : Unfixed 3 Indoor address 000: No. to 0064: No : Unfixed A 2E Group address 0000: Individual 0002: Follower of group Automatic restart of power failure Selection of option/ input (CN23) HA terminal (CN6) select 000: Header of group 0099: Unfixed 0000: None 000: Restart 000: Restart 0000: Filter input 0002: External interlock 0000: Usual 0002: Fire alarm input 0004: Medium static ducted type 000: Alarm input (Option parts) 0002: External interlock 000: Leaving-ON prevention control 0000: Usual (HA terminal) 3 Ventilating fan control 0000: Unavailable 000: Available 0000: Unavailable 32 TA sensor selection 0000: Body TA sensor 000: Remote controller sensor 0000: Body TA sensor 33 Temperature select 0000: C 000: F : (at factory shipment) 000: : F 3

32 DN Item Description At shipment 5d SET DATA External static pressure DIP Switch position psi (55Pa) 0.03psi (90Pa) 0.07psi (20Pa) 0.006psi (40Pa) Standard (Factory default) High static pressure High static pressure 3 Low static pressure SW0 SW02 SW0 SW02 SW0 SW02 SW0 SW02 OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF ON OFF ON OFF ON ON ON ON ON OFF OFF OFF OFF Timer setting (wired remote controller) 0000: Available (can be performed) 000: Unavailable (cannot be performed) 0000: Available 92 Outside interlock release condition 0000: Operation stop 000: Release communication signal receive 0000: Operation stop Type DN code 0 Value Type Model 0004 Medium static ducted type MMD-AP BH2UL * Default value stored in EEPROM mounted on service P.C. board Indoor Unit Capacity DN code *** Value Capacity 0000* Invalid type type type type type type type type type type type type type type type ~ * Default value stored in EEPROM mounted on service P.C. board 32

33 7-4. Applied Control in Indoor Unit Remote location ON/OFF control box (TCB-IFCB-4UL) [Wiring and setup] Use the exclusive connector for connection with the indoor control P.C. board. In a group control, the system can operate when connecting with any indoor (Control P.C. board) in the group. However when taking out the operation/ signal from the other, it is necessary to take out from each individually.. Control items ) Start/Stop input signal : Operation start/stop in 2) Operation signal : Output during normal operation 3) Error signal : Output during alarm (Serial communication or indoor/outdoor protective device) operation 2. Wiring diagram using remote control interface (TCB-IFCB-4UL) Input IFCB-4UL : No voltage ON/OFF serial signal Output No voltage contact for operation, display Contact capacity: Below Max. AC240V 0.5A Indoor control P.C. board Remote location ON/OFF control box (TCB-IFCB-4UL) Start/Stop input COM (GND) 2 Remote controller prohibition/clear input 3 Operation signal output 4 COM (+2V) 5 Error signal output 6 CN6 T0 (YEL) CN CN3 ON/OFF serial signal input COM Operation signal output Error signal output Power supply 208/

34 Ventilating fan control from remote controller [Function] The start/stop operation can be operated from the wired remote controller when air to air heat exchanger or ventilating fan is installed in the system. The fan can be operated even if the indoor is not operating. Use a fan which can receive the no-voltage A contact as an outside input signal. In a group control, the s are collectively operated and they can not be individually operated.. Operation Handle a wired remote controller in the following procedure. Use the wired remote controller during stop of the system. Be sure to set up the wired remote controller to the header. (Same in group control) In a group control, if the wired remote controller is set up to the header, both header and follower s are simultaneously operable. Push concurrently SET + CL + TEST buttons for 4 seconds or more. The No. displayed firstly indicates the header indoor address in the group control. In this time, the fan of the selected indoor turns on. 2 Every pushing UNIT LOUVER button(button at left side), the indoor numbers in group control are displayed successively. In this time, the fan of the selected indoor only turns on. 3 Using the temperature setup / button, specify the CODE No Using the timer time / button, select the SET DATA. (At shipment: 0000 ) The setup data are as follows: SET DATA Handling of operation of air to air heat exchanger or ventilating fan Unavailable (At shipment) Available 5 Push SET button. (OK if display goes on.) To change the selected indoor, go to the procedure 2 ). To change the item to be set up, go to the procedure 3 ). 6 Pushing TEST returns the status to the usual stop status. 2. Wiring CN32 FAN DRIVE (2P WHI) 2 2 Relay (DC2V, procured locally) Corresponds to the relay up to one that the rated current of the operation coil is approx. 75mA Outside control input of fan To terminal Indoor control P.C. board Note) Determine the cable length between the indoor control P.C. board and the relay within 2m. Corresponds up to a relay in which rated current of the operation coil is approx. 75mA Other type models: Correspond up to a relay in which rated current of the operation coil is approx. 6mA (Does not correspond to a terminal block type relay on the market.) 34

35 Leaving-ON prevention control [Function] This function controls the indoor s individually. It is connected with cable to the control P.C. board of the indoor. In a group control, it is connected with cable to the indoor (Control P.C. board), and the CODE No. 2E is set to the connected indoor. It is used when the start operation from outside if unnecessary but the stop operation is necessary. Using a card switch box, card lock, etc, the forgotten-off of the indoor can be protected. When inserting a card, start/stop operation from the remote controller is allowed. When taking out a card, the system stops if the indoor is operating and start/stop operation from the remote controller is forbidden.. Control items ) Outside contact ON : The start/stop operation from the remote controller is allowed. (Status that card is inserted in the card switch box) 2) Outside contact OFF : If the indoor is operating, it is stopped forcedly. (Start/Stop prohibited to remote controller) (Status that card is taken out from the card switch box) * When the card switch box does not perform the above contact operation, convert it using a relay with b contact. 2. Operation Handle the wired remote controller switch in the following procedure. * Use the wired remote controller switch during stop of the system. Push concurrently SET + CL + TEST buttons for 4 seconds or more. 2 Using the temperature setup / button, specify the CODE No. 2E. 3 Using the timer time / button, set 000 to the setup data. 4 Push SET button. 5 Push TEST button. (The status returns to the usual stop status.) 3. Wiring CN6 T0 (YEL) Relay (procured locally) * In the figure, the contact indicates a status that the card is taken out. Indoor control P.C. board Note) Determine the cable length between the indoor control P.C. board and the relay within 2m. Power peak-cut from indoor When the relay is turned on, a forced thermostat-off operation starts. Wiring example CN73 EXCT (2P plug: RED) 2 2 Relay (procured locally) Relay coil signal Power supply Outside contact (Card switch box, etc: Procured locally) Note) Determine the cable length between the indoor or outdoor control P.C. board and the relay within 2m. Indoor control P.C. board 35

36 Address setup (Manual setting from Wired remote controller) In case that addresses of the indoor s will be determined prior to piping work after wiring work Set an indoor per a remote controller. Turn on power supply. Push SET + CL + TEST buttons simultaneously for 4 seconds or more. 2 (Line address) Using the temperature setup / buttons, set 2 to the CODE No. 3 Using timer time / buttons, set the line address. 4 Push SET button. (OK when display goes on.) 5 (Indoor address) Using the temperature setup / buttons, set 3 to the CODE No. 6 Using timer time / buttons, set to the line address. 7 Push SET button. (OK when display goes on.) 8 (Group address) Using the temperature setup / buttons, set 4 to the CODE No. 9 Using timer time / buttons, set 0000 to Individual, 000 to Header and 0002 to follower. 0 Push SET button. (OK when display goes on.) Push TEST button. Setup completes. (The status returns to the usual stop status.) Line address Indoor address Group address (Example of 2-lines cabling) (Real line: Wiring, Broken line: Refrigerant pipe) Outdoor Outdoor Indoor Indoor Indoor Indoor Indoor Header 2 2 Follower For the above example, perform setting by connecting singly the wired remote controller without remote controller inter- cable. Group address Individual : 0000 Header : 000 In case of group control Follower : , 5, 8 3, 6, 9 END 4, 7, 0 FILTER RESET TEMP. TEST SET TIME <Operation procedure> CL SAVE SWING/FIX END 3 2 CODE No. SET DATA SETTING TEST UNIT No A LL 0 R.C. No. Note ) When setting the line address from the remote controller, do not use Address 29 and 30. As they are addresses which cannot be set to the outdoor, if they are set, the check code [E04] (Indoor/Outdoor communication circuit ) is issued. Note 2) When an address was manually set from the remote controller and the central control over the refrigerant lines is carried out, perform the following setting for the Header of each line. Set the line address for every line using SW3 and 4 on the interface P.C. board of the Header in each line. Except the least line address No., turn off SW30-2 on the interface P.C. board of the Header s in the lines connected to the identical central control. (Draw the terminal resistances of indoor/outdoor and central control line wirings together.) For each refrigerant line, connect the relay connector between Header [UU2] and [U3U4] terminals. After then set the central control address. (For setting of the central control address, refer to the Installation manual for the central control equipment.) TIMER SET FAN ON / OFF MODE VENT UNIT LOUVER

37 Confirmation of indoor No. position. To know the indoor addresses though position of the indoor is recognized In case of individual operation (Wired remote controller : indoor = : ) (Follow to the procedure during operation) <Procedure> ON / OFF Push button (button at left side) if the stops. 2 Push UNIT LOUVER button (button at left side). Unit No. - is displayed on LCD. (It disappears after several seconds.) The displayed No. indicate line address and indoor address. (When other indoor s are connected to the identical remote controller (Group control ), other numbers are also displayed every UNIT LOUVER pushing button(button at left side). FILTER RESET TEMP. TEST TIMER SET TIME SET CL FAN SAVE SWING/FIX F ON / OFF MODE VENT UNIT LOUVER Operation 2 <Operation procedure> 2 END 2. To know the position of indoor by address To confirm the No. in the group control (Follow to the procedure during operation) (in this procedure, the indoor s in group control stop.) <Procedure> The indoor numbers in the group control are successively displayed, and fan, louver, and drain pump of the corresponding indoor are turned on. (Follow to the procedure during operation) VENT Push and TEST buttons simultaneously for 4 seconds or more. Unit No. is displayed. Fans and louvers of all the indoor s in the group control operate. 2 Every pushing UNIT LOUVER button(button at left side), the numbers in the group control are successively displayed. The No. displayed at the first time indicates the master address. Fan and louver of the selected indoor only operate. 3 Push TEST button to finish the procedure. All the indoor s in the group control stop. 3 TEMP. FILTER RESET TEST TIMER SET SET TIME <Operation procedure> 2 3 END CL FAN SAVE SWING/FIX ON / OFF MODE VENT UNIT LOUVER 2 37

38 How to check all the No. from an arbitrary wired remote controller <Procedure> Carry out this procedure during stop of system. The indoor No. and the position in the identical refrigerant piping can be checked. An outdoor is selected, the identical refrigerant piping and the indoor No. are displayed one after the other, and then its fan and louver are on. Push the timer time button + TEST simultaneously for 4 seconds or more. First line and CODE No. AC (Address Change) are displayed. (Select outdoor.) 2 Select line address using UNIT LOUVER / SWING/FIX button. 3 Determine the selected line address using SET button. The address of the indoor connected to the refrigerant piping of the selected outdoor is displayed and the fan and the louver are on. 4 Every pushing UNIT LOUVER button (button at left side), the indoor No. in the identical piping is displayed one after the other. Only fan and louver of the selected indoor start operation. [To select the other line address] 5 Push CL button and the operation returns to Procedure 2. * The indoor address of other line can be continuously checked. 6 Push TEST button and then the procedure finishes. TEMP. ON / OFF TIMER SET FAN MODE FILTER RESET TEST TIME SET CL SAVE SWING/FIX VENT UNIT LOUVER <Operation procedure> END 2 38

39 How to change an indoor address by using a wired remote control Use this method to change the address of indoor s (one to one or group control) that have had the original address set automatically. This procedure must be done while the s are not operating. Simultaneously push and hold the SET SET, CL CL, and TEST TEST buttons for more than 4 seconds. If there are 2 or more s in a group, the first UNIT No. indicated is the header. 2 Push the left end of the UNIT LOUVER UNIT LOUVER button repeatedly to select an indoor address to change. If 2 or more s are controlled in a group the fan and louvers of the selected will be energized. 3 Push the TEMP. / buttons repeatedly to select 3 for CODE No. 4 Push the TIME / buttons repeatedly to change the value indicated in the SET DATA section. 5 Push the SET SET button, to save address. 6 Push left and of the UNIT LOUVER UNIT LOUVER button repeatedly to select another indoor addresses to change. Repeat steps 4 through 6 to continue changing indoor address and make each of them unique. 7 Push the left end of the UNIT LOUVER UNIT LOUVER button to review/confirm the revised addresses. 8 If the addresses have been changed correctly, push the TEST TEST button to finish the procedure. CODE No. SET DATA SETTING UNIT No. 00:00-0 R.C. No Fin FILTER RESET TEMP. TIMER SET TIME CL FAN SAVE SWING/FIX ON / OFF MODE VENT 2, 6,

40 How to change all indoor addresses from an arbitrary wired remote controller (It is possible when setting has finished by automatic addresses.) Contents: The indoor addresses in each identical refrigerant piping line can be changed from an arbitrary wired remote controller. Enter in address check/change mode and then change the address. <Procedure> Carry out this procedure during stop of system. Push the timer time button + TEST simultaneously for 4 seconds or more. First line and CODE No. AC (Address Change) are displayed. 2 Select line address using UNIT LOUVER / SWING/FIX button. 3 Push the SET button. The address of the indoor connected to the refrigerant piping of the selected outdoor is displayed and the fan and the louver are on. First the current indoor address is displayed. (Line address is not displayed.) 4 TIME button push up/down the indoor address of the SET DATA. The set data is changed to a new address. 5 Push SET button to determine the set data. 6 Every pushing UNIT LOUVER button (button at left side), the indoor No. in the identical piping is displayed one after the other. Only fan and louver of the selected indoor start operation. Repeat the Procedures 4 to 6 to change all the indoor addresses so that they are not duplicated. 7 Push SET button. (All the indications of LCD go on.) 8 Push TEST button and then the procedure finishes. 3 8 Finish 5 TEMP. FILTER RESET TEST FILTER RESET TEST TIMER SET SET TIME CL TIMER SET FAN SAVE SWING/FIX <Operation procedure> END SET TIME CL FAN SAVE SWING/FIX ON / OFF Cancel of line selection TEMP. MODE VENT UNIT LOUVER If the UNIT No. is not call up here, the outdoor in that line does not exist. Push CL button to select a line again in the Procedure 2. ON / OFF MODE VENT UNIT LOUVER When you want to complete the setting

41 Function to clear. Clearing method from remote controller How to clear of outdoor In the of refrigerant line connected by indoor of the remote controller to be operated, the of the outdoor currently detected is cleared. (Error of the indoor is not cleared.) The service monitor function of the remote controller is utilized. <Method> Push CL + TEST buttons simultaneously for 4 seconds or more to change the mode to service monitor mode. 2 Push TEMP. button to set the item code to [FF ]. 3 The display of A part in the following figure is counted as with 5-seconds interval. When 0000 appear, the was cleared. However counting from 0005 is repeated on the display screen. 4 When pushing TEST button, the status becomes normal. 3 TEMP. ON / OFF 2 TIMER SET FAN MODE TIME SAVE VENT FILTER RESET TEST SET CL SWING/FIX UNIT LOUVER 4 <Operation procedure> Returns to normal status How to clear of indoor ON / OFF The of indoor is cleared by button of the remote controller. (Only of the indoor connected with remote controller to be operated is cleared.) 4

42 Monitoring function of remote controller switch When using the remote controller (Model Name: RBC-AMT32UL), the following monitoring function can be utilized. Calling of display <Contents> The temperature of each sensor of the remote controller, indoor and outdoor and the operating status can be checked by calling the service monitor mode from the remote controller. <Procedure> Push TEST + CL buttons simultaneously for 4 seconds or more to call up the service monitor mode. The service monitor goes on and firstly the temperature of the CODE No. 00 is displayed. TEMP. 2 Push button to change CODE No. (CODE No.) to the CODE No. to be monitored. For display code, refer to the following table. 3 Push UNIT LOUVER button (button at left side) to change to item to be monitored. The sensor temperature of indoor or outdoor in its refrigerant line and the operating status are monitored. 4 Push TEST button to return the status to the normal display. 2 TEMP. TIMER SET FAN ON / OFF MODE TIME SAVE VENT FILTER RESET TEST SET CL SWING/FIX UNIT LOUVER 4 3 <Operation procedure> Returns to normal display

43 Indoor data * 2 System data Outdoor individual data * 3 CODE No. Data name Display format Unit Remote controller display example 00 Room temperature (During control) F [008]=7 F(27 C) 0 Room temperature (Remote controller) F 02 Indoor suction temperature (TA) F 03 Indoor coil temperature (TCJ) F 04 Indoor coil temperature (TC2) F [0075]=75 F(24 C) 05 Indoor coil temperature (TC) F 06 Indoor discharge temperature (TF) * F 08 Indoor PMV opening /0 pls [050]=500pulse 0A No. of connected indoor s [0024]=24 s 0B Total capacity of connected indoor s 0 ton [025]=2.5ton 0C No. of connected outdoor s [0002]=2 s 0D Total capacity of outdoor s 0 ton [060]=6ton CODE No. U U2 Data name Display format Unit Remote controller display example 0 20 High-pressure sensor detention pressure (Pd) 0 psi 2 Low-pressure sensor detention pressure (Ps) 0 psi [4350]=435psi 2 22 Compressor discharge temperature (Td) F 3 23 Compressor 2 discharge temperature (Td2) F 4 24 Compressor 3 discharge temperature (Td3) F 5 25 Suction temperature (TS) F 6 26 Outdoor coil temperature (TE) F [0075]=75 F(24 C) 7 27 Outdoor coil temperature 2 (TE2) F 8 28 Temperature at liquid side (TL) F 9 29 Outside ambient temperature (TO) F A 2A PMV + 2 opening pls B 2B PMV4 opening pls [0500] =500pulse C 2C Compressor current (I) 0 A D 2D Compressor 2 current (I2) 0 A E 2E Compressor 3 current (I3) 0 A [035]=3.5A F 2F Outdoor fan current (IFan) 0 A Outdoor individual data 2 * 4 CODE No. U U2 Data name Display format Unit Remote controller display example Compressor revolutions 0 rps 5 6 Compressor 2 revolutions 0 rps [0642]=64.2rps Compressor 3 revolutions 0 rps Outdoor fan mode mode [0058]= 58 mode Compressor IPDU heat sink temperature F Compressor IPDU 2 heat sink temperature F Compressor IPDU 3 heat sink temperature F Outdoor fan IPDU heat sink temperature F 58 - Heating/cooling recovery controlled * 5 0: Normal : Recovery controlled 59 - Pressure release * 5 5A - Discharge temperature release * 5 0: Normal : Release controlled 5B - Follower release (U2/U2/U4 outdoor s) * 5 [0075]=75 F(24 C) [000]=Heating recovery controlled [000]=Cooling recovery controlled [000]=Pressure release controlled [000]=Discharge temperature release controlled [000]=U2 outdoor release controlled [000]=U3 outdoor release controlled [000]=U4 outdoor release controlled 5F 6F Outdoor capacity 0 ton [0080]=8ton * Only a part of indoor types is installed with the discharge temperature sensor. This temperature is not displayed for other types. *2 When the s are connected to a group, data of the header indoor only can be displayed. *3 The first digit of an CODE No. indicates the outdoor number. *4 The upper digit of an CODE No. -4 indicates the outdoor number., 5... U outdoor (Header ) 2, 6... U2 outdoor (Follower ) *5 Only the CODE No. 5* of U outdoor (Header ) is displayed. 43

44 Changing of settings for Celsius display Push ON / OFF Procedure button if the stops. Push simultaneously TEST + SET + CL buttons for 4 seconds or more. After a while, the display part flashes as shown right. Check the displayed CODE No. is [0 ]. When the CODE No. is other than [0 ], push TEST button to erase the display and repeat procedure from the first step. (After pushing TEST button, operation of the remote controller is not accepted for approx. minute.) (For a group control, No. of the firstly displayed indoor becomes the header.) Procedure 2 Every pushing UNIT LOUVER button (button at left side), the indoor No. in the group control is displayed in order. Select the indoor of which setup is changed. In this time, the position of the indoor of which setup is changed can be confirmed because fan and louver of the selected indoor operate. SET DATA SETTING UNIT No. R.C. No. CODE No. Procedure 3 TEMP.. Using temp. setup buttons, specify CODE No. [33 ]. (CODE No. [33 ]: Fahrenheit display) TIME 2. Using timer buttons, change the line address from [000 ] to [0000. ] 3. Push SET button. In this time, the setup finishes when the display changes from flashing to lighting. Procedure 4 SET DATA SETTING After check of the changed contents, push TEST button. (Setup is determined.) When pushing TEST button, the display disappears and the status becomes the usual stop status. (When pushing TEST button the operation from the remote controller is not accepted for approx. minute.) If the operation from the remote controller is not accepted even minute or more passed after pushing TEST button, it is considered that the address setup is incorrect. In this case, the automatic address must be again set up. When changing the settings from Celsius to Fahrenheit indication, follow to the reverse order of the above procedure. SETTING UNIT No. R.C. No. CODE No. 44

45 8. TROUBLESHOOTING 8-. Overview () Before engaging in troubleshooting (a) Applicable models All Super Module Multi (SMMS-i) models. (Indoor s: MMD-APOOO, Outdoor s: MMY-MAPOOO4HT9UL) (b) Tools and measuring devices required Screwdrivers (Philips, flat head), spanners, long-nose pliers, nipper, pin to push reset switch, etc. Multimeter, thermometer, pressure gauge, etc. (c) Things to check prior to troubleshooting (behaviors listed below are normal) NO. Behavior Possible cause A compressor would not start An indoor fan would not start An outdoor fan would not start or would change speed for no reason An indoor fan would not stop The air conditioner would not respond to a start/stop command from a remote controller Could it just be the 3-minute delay period (3 minutes after compressor shutdown)? Could it just be the air conditioner having gone thermo OFF? Could it just be the air conditioner operating in fan mode or put on the timer? Could it just be the system going through initial communication? Could it just be cold air discharge prevention control, which is part of heating? Could it just be cooling operation under low outside temperature conditions? Could it just be defrosting operation? Could it just be the elimination of residual heat being performed as part of the air conditioner shutdown process after heating operation? Could it just be the air conditioner operation under external or remote control? (2) Troubleshooting procedure When a fault occurs, proceed with troubleshooting in accordance with the procedure shown below. Fault Investigate check code displayed on interface P.C. board of header "E28" Investigate check code displayed on interface P.C. board of relevant follower Any other fault Check fault site or faulty part NOTE Rather than a genuine fault (see the List of Check Codes below), the problem could have been caused by a microprocessor malfunction attributable to a poor quality of the power source or an external noise. Check for possible noise sources, and shield the remote controller wiring and signal wires as necessary. 45

46 8-2. Troubleshooting Method The remote controllers (main remote controller and central control remote controller) and the interface P.C. board of an outdoor are provided with an LCD display (remote controller) or a 7-segment display (outdoor interface P.C. board) to display operational status. Using this self-diagnosis feature, the fault site/faulty part may be identified in the event of a fault by following the method described below. The list below summarizes check codes detected by various devices. Analyze the check code according to where it is displayed and work out the nature of the fault in consultation with the list. When investigating a fault on the basis of a display provided on the indoor remote controller or TCC-LINK central control remote controller - See the TCC-LINK remote control or main remote controller display section of the list. When investigating a fault on the basis of a display provided on an outdoor - See the Outdoor 7-segment display section of the list. When investigating a fault on the basis of a wireless remote controller-controlled indoor - See the Light sensor indicator light block section of the list. List of Check Codes (Indoor Unit) (Error detected by indoor ) TCC-LINK central control or main remote controller display Check code Outdoor 7-segment display Sub-code E03 E04 Display of receiving Indicator light block Flash Typical fault site Indoor-remote controller periodic communication Indoor-outdoor periodic communication Description of Communication from remote controller or network adaptor has been lost (so has central control communication). Signals are not being received from outdoor. E08 E08 Duplicated indoor address Duplicated indoor address Indoor detects address identical to its own. E0 E8 Operation Timer Ready F0 ALT F02 ALT F03 ALT F0 ALT F ALT Indoor inter-mcu communication Error in periodic communication between indoor header and follower Indoor heat exchanger temperature sensor (TCJ) Indoor heat exchanger temperature sensor (TC2) Indoor heat exchanger temperature sensor (TC) Ambient temperature sensor (TA) Discharge temperature sensor (TF) F29 SIM P.C. board or other indoor L03 SIM L07 SIM Duplicated indoor group header Connection of group control cable to stand-alone indoor L08 L08 SIM Indoor group address not set L09 SIM Indoor capacity not set L20 SIM Duplicated central control address L30 L30 Detected indoor No. SIM Indoor external input (interlock) P0 ALT Indoor AC fan MCU communication between main controller and motor microcontroller is faulty. Periodic communication between indoor header and follower s cannot be maintained. Heat exchanger temperature sensor (TCJ) has been open/short-circuited. Heat exchanger temperature sensor (TC2) has been open/short-circuited. Heat exchanger temperature sensor (TC) has been open/short-circuited. Ambient temperature sensor (TA) has been open/ short-circuited. Discharge temperature sensor (TF) has been open/ short-circuited. Indoor EEPROM is abnormal (some other may be detected). There is more than one header in group. There is at least one stand-alone indoor to which group control cable is connected. Address setting has not been performed for one or more indoor s (also detected at outdoor end). Capacity setting has not been performed for indoor. There is duplication in central control address setting. Unit shutdown has been caused by external input (CN23) Indoor AC fan is detected (activation of fan motor thermal relay). P0 P0 Detected indoor No. ALT Indoor overflow Float switch has been activated. P2 ALT Indoor DC fan IPDU: Intelligent Power Drive Unit (Inverter P.C. board) : Lighting, : Flashing, : Goes off ALT.: Flashing is alternately when there are two flashing LED SIM: Simultaneous flashing when there are two flashing LED Indoor DC fan (e.g. overcurrent or lock-up) is detected. In the case of incorrect duct setting performed at installation or if an access panel for the maintenance is removed while indoor is in operation P3 ALT Other indoor Follower cannot be operated due to header alarm (E03/L03/L07/L08). 46

47 (Error detected by main remote controller) Check code Display of receiving Outdoor 7-segment display Main remote controller Sub-code Indicator light block Operation Timer Ready Flash Typical fault site Description of E0 E02 E09 No master remote controller, faulty remote controller communication (reception) Faulty remote controller communication (transmission) Duplicated master remote controller Signals cannot be received from indoor ; master remote controller has not been set (including two remote controller control). Signals cannot be transmitted to indoor. Both remote controllers have been set as master remote controller in two remote controller control (alarm and shutdown for header and continued operation for follower ) (Error detected by central control device) Check code Display of receiving TCC-LINK central control Outdoor 7-segment display Sub-code Indicator light block Operation Timer Ready Flash Typical fault site Description of C05 C06 No indication (when main remote controller also in use) Faulty central control communication (transmission) Faulty central control communication (reception) Multiple network adapters Central control device is unable to transmit signal due to duplication of central control device Central control device is unable to receive signal. Multiple network adapters are connected to remote controller communication line C2 P30 As per alarm (see above) Blanket alarm for generalpurpose device control interface Group control follower Device connected to general-purpose device control interface for TCC-LINK is faulty. Group follower is faulty ( No. and above detail [ ] displayed on main remote controller) Note: The same, e.g. a communication, may result in the display of different check codes depending on the device that detects it. Moreover, check codes detected by the main remote controller/central control device do not necessarily have a direct impact on air conditioner operation. 47

48 List of Check Codes (Outdoor Unit) (Errors detected by SMMS-i outdoor interface - typical examples) E06 Check code Outdoor 7-segment display Sub-code Number of indoor s from which signal is received normally TCC-LINK central control or main remote controller display E06 E07 (E04) Display of receiving Indicator light block Flash Typical fault site Dropping out of indoor Indoor-outdoor communication circuit E08 Duplicated indoor address (E08) Duplicated indoor address E2 0: Indoor-outdoor communication 02: Outdoor-outdoor communication E2 E5 E5 E6 E9 E20 00: Overloading 0: Number of s connected 00: No header 02: Two or more header s 0: Connection of outdoor from other refrigerant line 02: Connection of indoor from other refrigerant line E6 E9 E20 E23 E23 E25 E25 E26 Address of outdoor from which signal is not received normally E26 Automatic address starting Indoor not found during automatic address setting Too many indoor s connected/overloading Error in number of outdoor header s Connection to other refrigerant line found during automatic address setting Outdoor-outdoor communication transmission Duplicated follower outdoor address Dropping out of outdoor E28 Detected outdoor No. E28 Outdoor follower F04 F04 ALT F05 F05 ALT F06 0: TE 02: TE2 F06 ALT F07 F07 ALT F08 F08 ALT F F Operation Timer Ready A3-IPDU Fan A3-IPDU Fan 2 3 IPDU 2 3 IPDU 0 O 0A O O 02 O 0B O O O E3 03 O O 0C O O 04 O 0D O O O E3 IPDU communication 05 O O 0E O O O 06 O O 0F O O O O 07 O O O Circle (O): 08 O Faulty IPDU 09 O O Outdoor discharge temperature sensor (TD) Outdoor discharge temperature sensor (TD2) Outdoor heat exchanger temperature sensor (TE, TE2) Outdoor liquid temperature sensor (TL) Outdoor outside air temperature sensor (TO) IPDU: Intelligent Power Drive Unit (Inverter P.C. board) : Lighting, : Flashing, : Goes off ALT.: Flashing is alternately when there are two flashing LED SIM: Simultaneous flashing when there are two flashing LED Description of Indoor initially communicating normally fails to return signal (reduction in number of indoor s connected). Signal cannot be transmitted to indoor s ( indoor s left without communication from outdoor ). More than one indoor is assigned same address (also detected at indoor end). Indoor automatic address setting is started while automatic address setting for equipment in other refrigerant line is in progress. Outdoor automatic address setting is started while automatic address setting for indoor s is in progress. Indoor fails to communicate while automatic address setting for indoor s is in progress. Combined capacity of indoor s is too large (more than 35% of combined capacity of outdoor s). There is no or more than one outdoor header in one refrigerant line. Indoor from other refrigerant line is detected while indoor automatic address setting is in progress. Signal cannot be transmitted to other outdoor s. There is duplication in outdoor addresses set manually. Follower outdoor initially communicating normally fails to do so (reduction in number of follower outdoor s connected). Outdoor header detects fault relating to follower outdoor (detail displayed on follower outdoor ). There is no communication between IPDUs (P.C. boards) in inverter box. Outdoor discharge temperature sensor (TD) has been open/short-circuited. Outdoor discharge temperature sensor (TD2) has been open/short-circuited. Outdoor heat exchanger temperature sensors (TE, TE2) have been open/short-circuited. Outdoor liquid temperature sensor (TL) has been open/short-circuited. Outdoor outside air temperature sensor (TO) has been open/short-circuited. 48

49 F2 F2 ALT F5 F5 ALT F6 F6 ALT F22 F22 ALT F23 F23 ALT F24 F24 ALT Outdoor suction temperature sensor (TS) Outdoor temperature sensor (TE, TL) wiring Outdoor pressure sensor (Pd, Ps) wiring Outdoor discharge temperature sensor (TD3) Low pressure sensor (Ps) High pressure sensor (Pd) F3 F3 SIM Outdoor EEPROM H05 H05 H06 H06 Outdoor discharge temperature sensor (TD) wiring Activation of low-pressure protection H07 H07 Low oil level protection H08 0: TK sensor 02: TK2 sensor 03: TK3 sensor 04: TK4 sensor 05: TK5 sensor H08 H5 H5 H6 0: TK oil circuit 02: TK2 oil circuit 03: TK3 oil circuit 04: TK4 oil circuit 05: TK5 oil circuit H6 H25 H25 L04 L04 SIM L06 Check code Outdoor 7-segment display Sub-code Number of priority indoor s (check code L05 or L06 depending on individual ) TCC-LINK central control or main remote controller display L05 L06 Display of receiving Indicator light block Operation Timer Ready Flash SIM SIM L08 (L08) SIM Error in temperature sensor for oil level detection (TK-5) Outdoor discharge temperature sensor (TD2) wiring Oil level detection circuit Outdoor discharge temperature sensor (TD3) wiring Duplicated outdoor refrigerant line address Duplicated priority indoor (as displayed on priority indoor ) Duplicated priority indoor (as displayed on indoor other than priority indoor ) Indoor group address not set L0 L0 SIM Outdoor capacity not set L7 L7 SIM L8 L8 SIM L28 L28 SIM Typical fault site Outdoor model incompatibility Cooling/heating selection Too many outdoor s connected Description of Outdoor suction temperature sensor (TS) has been open/short-circuited. Wiring in outdoor temperature sensors (TE, TL) has been detected. Wiring in outdoor pressure sensors (Pd, Ps) has been detected. Outdoor discharge temperature sensor (TD3) has been open/short-circuited. Output voltage of low pressure sensor (Ps) is zero. Output voltage of high pressure sensor (Pd) is zero or provides abnormal readings when compressors have been turned off. Outdoor EEPROM is faulty (alarm and shutdown for header and continued operation for follower ) Wiring/installation or detachment of outdoor discharge temperature sensor (TD) has been detected. Low pressure (Ps) sensor detects abnormally low operating pressure. Temperature sensor for oil level detection (TK-5) detects abnormally low oil level. Temperature sensor for oil level detection (TK-5) has been open/short-circuited. Wiring/installation or detachment of outdoor discharge temperature sensor (TD2) has been detected. No temperature change is detected by temperature sensor for oil level detection (TK-5) despite compressor having been started. Wiring/installation or detachment of outdoor discharge temperature sensor (TD3) has been detected. Identical refrigerant line address has been assigned to outdoor s belonging to different refrigerant piping systems. More than one indoor has been set up as priority indoor. More than one indoor has been set up as priority indoor. Address setting has not been performed for one or more indoor s (also detected at indoor end). Outdoor capacity has not been set (after P.C. board replacement). Old model outdoor (prior to 3 series) has been connected. Cooling/heating cycle resulting from piping is detected. More than four outdoor s have been connected. 49

50 Check code Display of receiving Outdoor 7-segment display Sub-code TCC-LINK central control or main remote controller display Indicator light block Operation Timer Ready Flash Typical fault site Description of A3-IPDU Fan A3-IPDU Fan 2 3 IPDU 2 3 IPDU 0 O 0A O O 02 O 0B O O O 03 O O 0C O O L29 04 O 0D O O O L29 SIM Error in number of IPDUs 05 O O 0E O O O 06 O O 0F O O O O 07 O O O Circle (O): 08 O Faulty IPDU 09 O O There are insufficient number of IPDUs (P.C. boards) in inverter box. L30 Detected indoor No. (L30) SIM Indoor external input (interlock) P03 P03 Outdoor discharge (TD) ALT temperature 00: Open phase detected Open phase/power failure P05 0: Compressor P05 ALT Inverter DC voltage (Vdc) 02: Compressor 2 03: Compressor 3 MG-CTT P07 0: Compressor 02: Compressor 2 03: Compressor 3 P07 ALT Heat sink overheating P0 Indoor No. detected (P0) ALT Indoor overflow P3 P3 ALT P5 0: TS condition 02: TD condition P7 P7 ALT P8 P8 ALT P9 Outdoor No. detected P9 ALT P20 P20 ALT P5 Outdoor liquid backflow detection ALT Gas leak detection Outdoor discharge (TD2) temperature Outdoor discharge (TD3) temperature 4-way valve reversing Activation of high-pressure protection Indoor has been shut down for external input in one refrigerant line (detected by indoor ). Outdoor discharge temperature sensor (TD) has detected abnormally high temperature. Open phase is detected when power is turned on. Inverter DC voltage is too high (overvoltage) or too low (undervoltage). Temperature sensor built into IGBT (TH) detects overheating. Indoor has been shutdown in one refrigerant line due to detection of overflow (detected by indoor ). State of refrigerant cycle circuit indicates liquid backflow operation. Outdoor suction temperature sensor (TS) detects sustained and repeated high temperatures that exceed standard value. Outdoor discharge temperature sensor (TD2) detects abnormally high temperature. Outdoor discharge temperature sensor (TD3) detects abnormally high temperature. Abnormality in refrigerating cycle is detected during heating operation. High pressure (Pd) sensor detects high pressure that exceeds standard value. MG-CTT: Magnet contactor 50

51 (Errors detected by IPDU featuring in SMMS-i standard outdoor - typical examples) F3 H0 H02 H03 P04 P07 P22 P26 P29 Check code Outdoor 7-segment display Sub-code 0: Compressor 02: Compressor 2 03: Compressor 3 0: Compressor 02: Compressor 2 03: Compressor 3 0: Compressor 02: Compressor 2 03: Compressor 3 0: Compressor 02: Compressor 2 03: Compressor 3 0: Compressor 02: Compressor 2 03: Compressor 3 0: Compressor 02: Compressor 2 03: Compressor 3 0 : IGBT circuit : Position detection circuit 3 : Motor lockup 4 : Motor current detection C : TH sensor D : TH sensor E : Inverter DC voltage (outdoor fan) Note: Although letters 0 to F appear at locations indicated by, please ignore them. 0: Compressor 02: Compressor 2 03: Compressor 3 0: Compressor 02: Compressor 2 03: Compressor 3 TCC-LINK central control or main remote controller display F3 H0 H02 H03 P04 P07 Display of receiving Indicator light block Operation Timer Ready Flash ALT ALT ALT Typical fault site Error in temperature sensor built into indoor IGBT (TH) Compressor breakdown Description of Temperature sensor built into indoor IGBT (TH) has been open/short-circuited. Inverter current (Idc) detection circuit detects overcurrent. Compressor (lockup) Compressor lockup is detected Current detection circuit Activation of high-pressure SW Heat sink overheating Abnormal current is detected while inverter compressor is turned off. High-pressure SW is activated. Temperature sensor built into IGBT (TH) detects overheating. P22 ALT Outdoor fan IPDU Outdoor fan IPDU detects. P26 P29 ALT ALT Activation of G-Tr (IGBT) short-circuit protection Compressor position detection circuit Short-circuit protection for compressor motor driver circuit components is activated (momentary overcurrent). Compressor motor position detection is detected. Note: The above check codes are examples only, and different check codes may be displayed depending on the outdoor configuration (e.g. a Super heat recovery multi system). For details, see the service manual for the outdoor. 5

52 8-3. Troubleshooting Based on Information Displayed on Remote Controller Using main remote controller (RBC-AMT32UL) () Checking and testing When a fault occurs to an air conditioner, a check code and indoor No. are displayed on the display window of the remote controller. Check codes are only displayed while the air conditioner is in operation. If the display has already disappeared, access history by following the procedure described below. Check code Indoor No. in which fault has occurred (2) Error history The history access procedure is described below (up to four s stored in memory). Error history can be accessed regardless of whether the air conditioner is in operation or shut down. <Procedure> To be performed when system at rest Invoke the SERVICE CHECK mode by pushing the + buttons simultaneously and holding for at least 4 seconds. The letters SERVICE CHECK light up, and the check code 0 is displayed, indicating the history. This is accompanied by the indoor No. to which the history is related and a check code. 2 To check other history items, push the bu another check code. Chec 0 Check code 04 (oldest) Note: Err i ntains four items. 3 When the button is pushed, normal display is restored. 2 TEMP. FILTER RESET TEST TIMER SET SET 3 TIME CL FAN SAVE SWING/FIX Normal display is restored. Steps to follow 2 ON / OFF MODE VENT UNIT LOUVER 3 M Do not pu button as it would erase the whole history of the indoor. How to read displayed information <7-segment display symbols> <Corresponding alphanumerical letters> A b C d E F H J L P 52

53 Using indoor indicators (receiving light block) (wireless type) To identify the check code, check the 7-segment display on the header. To check for check codes not displayed on the 7-segment display, consult the List of Check Codes (Indoor Unit) in 8-2. Troubleshooting Method. : Goes off : Lighting : Blinking (0.5 seconds) Light block Check code Cause of fault Operation Timer All lights out Ready Power turned off or in wiring between receiving and indoor s Operation Timer Ready E0 E02 E03 Faulty reception Faulty transmission Loss of communication Receiving Error or poor contact in wiring between receiving and indoor s Blinking E08 E09 Duplicated indoor No. (address) Duplicated master remote controller Setting E0 Indoor inter-mcu communication E2 Automatic address starting E8 Error or poor contact in wiring between indoor s, indoor power turned off Operation Timer Ready E04 Error or poor contact in wiring between indoor and outdoor s (loss of indoor-outdoor communication) E06 Faulty reception in indoor-outdoor communication (dropping out of indoor ) Blinking E07 E5 Faulty transmission in indoor-outdoor communication Indoor not found during automatic address setting E6 Too many indoor s connected/overloading E9 Error in number of outdoor header s E20 Detection of refrigerant piping communication during automatic address setting E23 Faulty transmission in outdoor-outdoor communication E25 Duplicated follower outdoor address E26 Faulty reception in outdoor-outdoor communication, dropping out of outdoor E28 Outdoor follower E3 IPDU communication Operation Timer Ready P0 P0 Indoor AC fan Indoor overflow P2 Indoor DC fan Alternate blinking Operation Timer Ready Alternate blinking P3 P03 P04 P05 P07 P5 P7 P8 P9 P20 P22 P26 P29 P3 Outdoor liquid backflow detection Outdoor discharge (TD) temperature Activation of outdoor high-pressure SW Open phase/power failure Inverter DC voltage (Vdc) MG-CTT Outdoor heat sink overheating - Poor cooling of electrical component (IGBT) of outdoor Gas leak detection - insufficient refrigerant charging Outdoor discharge (TD2) temperature Outdoor discharge (TD3) temperature Outdoor 4-way valve reversing Activation of high-pressure protection Outdoor fan IPDU Outdoor G-Tr short-circuit Compressor position detection circuit Shutdown of other indoor in group due to fault (group follower ) MG-CTT: Magnet contactor 53

54 Light block Check code Cause of fault Operation Timer Alternate blinking Operation Timer Alternate blinking Ready Ready F0 F02 F03 F0 F F04 F05 F06 F07 F08 F2 F3 F5 Heat exchanger temperature sensor (TCJ) Heat exchanger temperature sensor (TC2) Heat exchanger temperature sensor (TC) Ambient temperature sensor (TA) Discharge temperature sensor (TF) Discharge temperature sensor (TD) Discharge temperature sensor (TD2) Heat exchanger temperature sensor (TE, TE2) Liquid temperature sensor (TL) Outside air temperature sensor (TO) Suction temperature sensor (TS) Heat sink sensor (TH) Indoor temperature sensor s Outdoor temperature sensor s Wiring in heat exchanger sensor (TE) and liquid temperature sensor (TL) Outdoor temperature sensor wiring/installation F6 Wiring in outdoor high pressure sensor (Pd) and low pressure sensor (Ps) Outdoor pressure sensor wiring F22 Outdoor discharge temperature sensor (TD3) F23 Low pressure sensor (Ps) Outdoor pressure sensor F24 High pressure sensor (Pd) s Operation Timer Ready F29 Fault in indoor EEPROM Synchronized blinking Operation Timer Blinking Ready H0 H02 H03 H05 Compressor breakdown Outdoor compressorrelated s Compressor lockup Current detection circuit Wiring/installation or detachment of outdoor discharge temperature sensor (TD) Operation Timer Ready Synchronized blinking Operation Timer Ready Synchronized blinking H06 Abnormal drop in low-pressure sensor (Ps) reading Protective shutdown of outdoor H07 Abnormal drop in oil level H08 Error in temperature sensor for oil level detection circuit (TK, TK2, TK3, TK4 or TK5) H5 Wiring/installation or detachment of outdoor discharge temperature sensor (TD2) H6 Oil level detection circuit - Error in outdoor TK, TK2, TK3, TK4 or TK5 circuit H25 Wiring/installation or detachment of outdoor discharge temperature sensor (TD3) L03 Duplicated indoor group header L05 Duplicated priority indoor (as displayed on priority indoor ) L06 Duplicated priority indoor (as displayed on indoor other than priority indoor ) L07 Connection of group control cable to stand-alone indoor L08 Indoor group address not set L09 Indoor capacity not set L04 Duplicated outdoor refrigerant line address L0 Outdoor capacity not set L7 Outdoor model incompatibility L8 Flow selector s L20 Duplicated central control address L28 Too many outdoor s connected L29 Error in number of IPDUs L30 Indoor external interlock 54

55 Light block Check code Cause of fault Operation Timer Ready F3 Outdoor EEPROM Synchronized blinking Other (indications not involving check code) Light block Check code Cause of fault Operation Timer Ready Test run in progress Synchronized blinking Operation Timer Ready Alternate blinking Setting incompatibility (automatic cooling/heating setting for model incapable of it and heating setting for cooling-only model) 55

56 8-4. Check Codes Displayed on Remote Controller and SMMS-i Outdoor Unit (7-Segment Display on I/F Board) and Locations to Be Checked For other types of outdoor s, refer to their own service manuals. Main remote controller Check code Outdoor 7-segment display Check code Sub-code Location of detection Description System status Error detection condition(s) Check items (locations) E0 Remote controller Indoor-remote controller communication (detected at remote controller end) Stop of corresponding Communication between indoor P.C. board and remote controller is disrupted. Check remote controller inter- tie cable (A/B). Check for broken wire or connector bad contact. Check indoor power supply. Check for defect in indoor P.C. board. Check remote controller address settings (when two remote controllers are in use). Check remote controller P.C. board. E02 Remote controller Remote controller transmission Stop of corresponding Signal cannot be transmitted from remote controller to indoor. Check internal transmission circuit of remote controller. --- Replace remote controller as necessary. E03 Indoor Indoor-remote controller communication (detected at indoor end) Stop of corresponding There is no communication from remote controller (including wireless) or network adaptor. Check remote controller and network adaptor wiring. E04 Indoor Indoor-outdoor communication circuit (detected at indoor end) Stop of corresponding Indoor is not receiving signal from outdoor. Check order in which power was turned on for indoor and outdoor s. Check indoor address setting. Check indoor-outdoor tie cable. Check outdoor termination resistance setting (SW30, Bit 2). E06 E06 No. of indoor s from which signal is received normally I/F Dropping out of indoor Indoor initially communicating normally fails to return signal for specified length of time. Check power supply to indoor. (Is power turned on?) Check connection of indoor-outdoor communication cable. Check connection of communication connectors on indoor P.C. board. Check connection of communication connectors on outdoor P.C. board. Check for defect in indoor P.C. board. Check for defect in outdoor P.C. board (I/F). E07 I/F Indoor-outdoor communication circuit (detected at outdoor end) Signal cannot be transmitted from outdoor to indoor s for 30 seconds continuously. Check outdoor termination resistance setting (SW30, Bit 2). Check connection of indoor-outdoor communication circuit. 56

57 Main remote controller Check code Outdoor 7-segment display Check code Sub-code Location of detection Description System status Error detection condition(s) Check items (locations) E08 E08 Duplicated indoor address Indoor I/F Duplicated indoor address More than one indoor is assigned same address. Check indoor addresses. Check for any change made to remote controller connection (group/ individual) since indoor address setting. E09 Remote controller Duplicated master remote controller Stop of corresponding In two remote controller configuration (including wireless), both controllers are set up as master. (Header indoor is shut down with alarm, while follower indoor s continue operating.) Check remote controller settings. Check remote controller P.C. boards. E0 Indoor Indoor inter- MCU communication Stop of corresponding Communication cannot be established/maintained upon turning on of power or during communication. Check for defect in indoor P.C. board E2 E2 0: Indoor-outdoor communication 02: Outdooroutdoor communication I/F Automatic address starting Indoor automatic address setting is started while automatic address setting for equipment in other refrigerant line is in progress. Outdoor automatic address setting is started while automatic address setting for indoor s is in progress. Perform automatic address setting again after disconnecting communication cable to that refrigerant line. E5 E5 I/F Indoor not found during automatic address setting Indoor cannot be detected after indoor automatic address setting is started. Check connection of indoor-outdoor communication line. Check for in indoor power supply system. Check for noise from other devices. Check for power failure. Check for defect in indoor P.C. board. E6 E6 00: Overloading 0-: No. of s connected I/F Too many indoor s connected Combined capacity of indoor s exceeds 20% of combined capacity of outdoor s. Note: If this code comes up after backup setting for outdoor failure is performed, perform No overloading detected setting. < No overloading detected setting method> Turn on SW09/Bit 2 on I/F P.C. board of outdoor header. More than 48 indoor s are connected. The system including Medium * Static Ducted may not sometimes output the code [6] because the microcomputer cannot judge that even if the connection of the indoor s was over its maximum capacity 20%. Check capacities of indoor s connected. Check combined HP capacities of indoor s. Check HP capacity settings of outdoor s. Check No. of indoor s connected. Check for defect in outdoor P.C. board (I/F). 57

58 Main remote controller Check code Outdoor 7-segment display Check code Sub-code Location of detection Description System status Error detection condition(s) Check items (locations) E8 Indoor Error in communication between indoor header and follower s Stop of corresponding Periodic communication between indoor header and follower s cannot be maintained. Check remote controller wiring. Check indoor power supply wiring. Check P.C. boards of indoor s. E9 E9 00: No header 02: Two or more header s I/F Error in number of outdoor header s There is more than one outdoor header in one line. There is no outdoor header in one line. Outdoor header is outdoor to which indooroutdoor tie cable (U,U2) is connected. Check connection of indoor-outdoor communication line. Check for defect in outdoor P.C. board (I/F). E20 E20 0: Connection of outdoor from other line 02: Connection of indoor from other line I/F Connection to other line found during automatic address setting Equipment from other line is found to have been connected when indoor automatic address setting is in progress. Disconnect inter-line tie cable in accordance with automatic address setting method explained in Address setting section. E23 E23 I/F Outdooroutdoor communication transmission Signal cannot be transmitted to other outdoor s for at least 30 seconds continuously. Check power supply to outdoor s. (Is power turned on?) Check connection of tie cables between outdoor s for bad contact or broken wire. Check communication connectors on outdoor P.C. boards. Check for defect in outdoor P.C. board (I/F). Check termination resistance setting for communication between outdoor s. E25 E25 I/F Duplicated follower outdoor address There is duplication in outdoor addresses set manually. Note: Do not set outdoor addresses manually. E26 E26 Address of outdoor from which signal is not received normally I/F Dropping out of outdoor Outdoor initially communicating normally fails to return signal for specified length of time. Backup setting is being used for outdoor s. Check power supply to outdoor. (Is power turned on?) Check connection of tie cables between outdoor s for bad contact or broken wire. Check communication connectors on outdoor P.C. boards. Check for defect in outdoor P.C. board (I/F). E28 E28 Detected outdoor No. I/F Outdoor follower Outdoor header receives code from outdoor follower. Check check code displayed on outdoor follower. <Convenient functions> If SW04 is pressed and held for at least second while [E28] is displayed on the 7- segmentdisplay of outdoor header, the fan of the outdoor that has been shut down due to an comes on. If SW04 and SW05 are pressed simultaneously, the fans of normal outdoor s come on. To stop the fan or fans, press SW05 on its own. 58

59 Main remote controller Check code Outdoor 7-segment display Check code Sub-code Location of detection Description System status Error detection condition(s) Check items (locations) E3 E3 Symbol O signifies site of IPDU. F0 F02 F03 F04 F04 F05 F05 F06 F A 0B 0C 0D 0E 0F 0: TE sensor 02: TE2 sensor F07 F07 A3-IPDU Fan 2 3 IPDU O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O I/F Indoor Indoor Indoor I/F I/F I/F IPDU communication Indoor TCJ sensor Indoor TC2 sensor Indoor TC sensor TD sensor TD2 sensor TE/TE2 sensor Stop of corresponding Stop of corresponding Stop of corresponding Communication is disrupted between IPDUs (P.C. boards) in inverter box. Sensor resistance is infinity or zero (open/short circuit). Sensor resistance is infinity or zero (open/short circuit). Sensor resistance is infinity or zero (open/short circuit). Sensor resistance is infinity or zero (open/short circuit). Sensor resistance is infinity or zero (open/short circuit). Sensor resistance is infinity or zero (open/short circuit). I/F TL sensor Sensor resistance is infinity or zero (open/short circuit). Check wiring and connectors involved in communication between IPDU-I/F P.C. board for bad contact or broken wire. Check for defect in outdoor P.C. board (I/F, A3-IPDU or Fan IPDU). Check for external noise. Check connection of TCJ sensor connector and wiring. Check resistance characteristics of TCJ sensor. Check for defect in indoor P.C. board. Check connection of TC2 sensor connector and wiring. Check resistance characteristics of TC2 sensor. Check for defect in indoor P.C. board. Check connection of TC sensor connector and wiring. Check resistance characteristics of TC sensor. Check for defect in indoor P.C. board. Check connection of TD sensor connector. Check resistance characteristics of TD sensor. Check for defect in outdoor P.C. board (I/F). Check connection of TD2 sensor connector. Check resistance characteristics of TD2 sensor. Check for defect in outdoor P.C. board (I/F). Check connection of TE/ TE2 sensor connectors. Check resistance characteristics of TE/TE2 sensors. Check for defect in outdoor P.C. board (I/F). Check connection of TL sensor connector. Check resistance characteristics of TL sensor. Check for defect in outdoor P.C. board (I/F). 59

60 Main remote controller Check code Outdoor 7-segment display Check code Sub-code Location of detection Description System status Error detection condition(s) Check items (locations) F08 F08 I/F TO sensor Sensor resistance is infinity or zero (open/short circuit). Check connection of TO sensor connector. Check resistance characteristics of TO sensor. Check for defect in outdoor P.C. board (I/F). F0 Indoor Indoor TA sensor Stop of corresponding Sensor resistance is infinity or zero (open/short circuit). Check connection of TA sensor connector and wiring. Check resistance characteristics of TA sensor. Check for defect in indoor P.C. board. F Indoor Indoor TF sensor Stop of corresponding Sensor resistance is infinity or zero (open/short circuit). Check connection of TF sensor connector and wiring. Check resistance characteristics of TF sensor. Check for defect in indoor P.C. board. F2 F2 I/F TS sensor Sensor resistance is infinity or zero (open/short circuit). Check connection of TS sensor connector. Check resistance characteristics of TS sensor. Check for defect in outdoor P.C. board (I/F). F3 F3 0: Compressor side 02: Compressor 2 side 03: Compressor 3 side IPDU TH sensor Sensor resistance is infinity or zero (open/short circuit). Defect in IGBT built-in temperature sensor Replace A3-IPDU P.C. board. F5 F5 I/F Outdoor temperature sensor wiring (TE, TL) During compressor operation in HEAT mode, TE continuously provides temperature reading higher than indicated by TL by at least specified margin for 3 minutes or more. Check installation of TE and TL sensors. Check resistance characteristics of TE and TL sensors. Check for outdoor P.C. board (I/F). F6 F6 I/F Outdoor pressure sensor wiring (Pd, Ps) Readings of high-pressure Pd sensor and lowpressure Ps sensor are switched. Output voltages of both sensors are zero. Check connection of highpressure Pd sensor connector. Check connection of lowpressure Ps sensor connector. Check for defect in pressure sensors Pd and Ps. Check for in outdoor P.C. board (I/F). Check for deficiency in compressive output of compressor. F22 F22 I/F TD3 sensor Sensor resistance is infinity or zero. (open/short circuit) Check connection of TD3 sensor connector. Check resistance characteristics of TD3 sensor. Check for defect in outdoor P.C. board (I/F). F23 F23 I/F Ps sensor Output voltage of Ps sensor is zero. Check for connection involving Ps sensor and Pd sensor connectors. Check connection of Ps sensor connector. Check for defect in Ps sensor. Check for deficiency in compressive output of compressor. Check for defect in 4-way valve. Check for defect in outdoor P.C. board (I/F). Check for defect in SV4 circuit. F24 F24 I/F Pd sensor Output voltage of Pd sensor is zero (sensor open-circuited). Pd > 60psi (4.5MPa) despite compressor having been turned off. Check connection of Pd sensor connector. Check for defect in Pd sensor. Check for defect in outdoor P.C. board (I/F). 60

61 Main remote controller Check code Outdoor 7-segment display Check code Sub-code Location of detection Description System status Error detection condition(s) Check items (locations) F29 F3 F3 H0 H02 H03 H0 H02 H03 0: Compressor side 02: Compressor 2 side 03: Compressor 3 side 0: Compressor side 02: Compressor 2 side 03: Compressor 3 side 0: Compressor side 02: Compressor 2 side 03: Compressor 3 side H05 H05 H06 H06 * Total shutdown in case of header Continued operation in case of follower Indoor I/F IPDU IPDU IPDU I/F I/F Other indoor Outdoor EEPROM Compressor breakdown Compressor (lockup) MG-CTT Current detection circuit TD sensor miswiring (incomplete insertion) Activation of low-pressure protection Stop of corresponding * Indoor P.C. board does not operate normally. Outdoor P.C. board (I/F) does not operate normally. Inverter current detection circuit detects overcurrent and shuts system down. Overcurrent is detected several seconds after startup of inverter compressor. Current flow of at least specified magnitude is detected despite inverter compressor having been shut turned off. Discharge temperature of compressor (TD) does not increase despite compressor being in operation. Low-pressure Ps sensor detects operating pressure lower than 0.02MPa. Check for defect in indoor P.C. board (faulty EEPROM) Check power supply voltage. Check power supply noise. Check for defect in outdoor P.C. board (I/F). Check power supply voltage. (AC208/220V± 0%) Check for defect in compressor. Check for possible cause of abnormal overloading. Check for defect in outdoor P.C. board (A3-IPDU). Check for defect in compressor. Check power supply voltage. (AC208/220V± 0%) Check compressor system wiring, particularly for open phase. Check connection of connectors/terminals on A3- IPDU P.C. board. Check conductivity of case heater. (Check for refrigerant entrapment inside compressor.) Check for defect in outdoor P.C. board (A3-IPDU). Check outdoor MG-CTT. Check current detection circuit wiring. Check defect in outdoor P.C. board (A3-IPDU). Check installation of TD sensor. Check connection of TD sensor connector and wiring. Check resistance characteristics of TD sensor. Check for defect in outdoor P.C. board (I/F). Check service valves to confirm full opening (both gas and liquid sides). Check outdoor PMVs for clogging (PMV, 2). Check for defect in SV2 or SV4 circuits. Check for defect in lowpressure Ps sensor. Check indoor filter for clogging. Check valve opening status of indoor PMV. Check refrigerant piping for clogging. Check operation of outdoor fan (during heating). Check for insufficiency in refrigerant quantity. MG-CTT: Magnet contactor 6

62 Main remote controller Check code Outdoor 7-segment display Check code Sub-code Location of detection Description System status Error detection condition(s) Check items (locations) H07 H07 I/F Low oil level protection Operating compressor detects continuous state of low oil level for about 2 hours. <All outdoor s in corresponding line to be checked> Check balance pipe service valve to confirm full opening. Check connection and installation of TK, TK2, TK3, TK4, and TK5 sensors. Check resistance characteristics of TK, TK2, TK3, TK4, and TK5 sensors. Check for gas or oil leak in same line. Check for refrigerant entrapment inside compressor casing. Check SV3A, SV3B, SV3C, SV3D, SV3E, and SV3F valves for defect. Check oil return circuit of oil separator for clogging. Check oil equalizing circuit for clogging. 0: TK sensor 02: TK2 sensor 03: TK3 sensor 04: TK4 sensor 05: TK5 sensor I/F Error in temperature sensor for oil level detection Sensor resistance is infinity or zero (open/short circuit). Sensor resistance is infinity or zero (open/short circuit). Check connection of TK sensor connector. Check resistance characteristics of TK sensor. Check for defect in outdoor P.C. board (I/F). Check connection of TK2 sensor connector. Check resistance characteristics of TK2 sensor. Check for defect in outdoor P.C. board (I/F). H08 H08 Sensor resistance is infinity or zero (open/short circuit). Check connection of TK3 sensor connector. Check resistance characteristics of TK3 sensor. Check for defect in outdoor P.C. board (I/F). Sensor resistance is infinity or zero (open/short circuit). Check connection of TK4 sensor connector. Check resistance characteristics of TK4 sensor. Check for defect in outdoor P.C. board (I/F). Sensor resistance is infinity or zero (open/short circuit). Check connection of TK5 sensor connector. Check resistance characteristics of TK5 sensor. Check for defect in outdoor P.C. board (I/F). H5 H5 I/F TD2 sensor miswiring (incomplete insertion) Air discharge temperature of (TD2) does not increase despite compressor 2 being in operation. Check installation of TD2 sensor. Check connection of TD2 sensor connector and wiring. Check resistance characteristics of TD2 sensor. Check for defect in outdoor P.C. board (I/F). 62

63 Main remote controller Check code Outdoor 7-segment display Check code Sub-code Location of detection Description System status Error detection condition(s) Check items (locations) 0: TK oil circuit 02: TK2 oil circuit 03: TK3 oil circuit 04: TK4 oil circuit 05: TK5 oil circuit I/F Oil level detection circuit No temperature change is detected by TK despite compressor having been started. Check for disconnection of TK sensor. Check resistance characteristics of TK sensor. Check for connection involving TK, TK2, TK3, TK4, and TK5 sensors Check for faulty operation in SV3E or SV3F valve. Check for clogging in oil equalizing circuit capillary and faulty operation in check valve. Check for refrigerant entrapment inside compressor. No temperature change is detected by TK2 despite compressor 2 having been started. Check for disconnection of TK2 sensor. Check resistance characteristics of TK2 sensor. Check for connection involving TK, TK2, TK3, TK4, and TK5 sensors Check for faulty operation in SV3E or SV3F valve. Check for clogging in oil equalizing circuit capillary and faulty operation in check valve. Check for refrigerant entrapment inside compressor. H6 H6 No temperature change is detected by TK3 despite compressor 3 having been started. Check for disconnection of TK3 sensor. Check resistance characteristics of TK3 sensor. Check for connection involving TK, TK2, TK3, TK4, and TK5 sensors Check for faulty operation in SV3E or SV3F valve. Check for clogging in oil equalizing circuit capillary and faulty operation in check valve. Check for refrigerant entrapment inside compressor. No temperature change is detected by TK4 despite compressor having been started. Check for disconnection of TK4 sensor. Check resistance characteristics of TK4 sensor. Check for connection involving TK, TK2, TK3, TK4, and TK5 sensors Check for faulty operation in SV3E or SV3F valve. Check for clogging in oil equalizing circuit capillary and faulty operation in check valve. Check for refrigerant entrapment inside compressor. No temperature change is detected by TK5 despite compressor having been started. Check for disconnection of TK5 sensor. Check resistance characteristics of TK5 sensor. Check for connection involving TK, TK2, TK3, TK4, and TK5 sensors Check for faulty operation in SV3E valve. Check for clogging in oil equalizing circuit capillary and faulty operation in check valve. Check for refrigerant entrapment inside compressor. H25 H25 I/F TD3 sensor miswiring (incomplete insertion) Air discharge temperature (TD3) does not increase despite compressor 3 being in operation. Check installation of TD3 sensor. Check connection of TD3 sensor connector and wiring. Check resistance characteristics of TD3 sensor. Check for defect in outdoor P.C. board (I/F). 63

64 Main remote controller Check code Outdoor 7-segment display Check code Sub-code Location of detection Description System status Error detection condition(s) Check items (locations) L03 Indoor Duplicated indoor header Stop of corresponding There is more than one header in group. Check indoor addresses. Check for any change made to remote controller connection (group/ individual) since indoor address setting. L04 L04 I/F Duplicated outdoor line address There is duplication in line address setting for outdoor s belonging to different refrigerant piping systems. Check line addresses. L05 I/F Duplicated priority indoor (as displayed on priority indoor ) More than one indoor has been set up as priority indoor. Check display on priority indoor. L06 L06 No. of priority indoor s I/F Duplicated priority indoor (as displayed on indoor other than priority indoor ) More than one indoor have been set up as priority indoor. Check displays on priority indoor and outdoor. L07 Indoor Connection of group control cable to standalone indoor Stop of corresponding There is at least one standalone indoor to which group control cable is connected. Check indoor addresses. L08 L08 Indoor Indoor group / addresses not set Stop of corresponding Address setting has not been performed for indoor s. Check indoor addresses. Note: This code is displayed when power is turned on for the first time after installation. L09 Indoor Indoor capacity not set Stop of corresponding Capacity setting has not been performed for indoor. Set indoor capacity. (DN = ) L0 L0 I/F Outdoor capacity not set Jumper wire provided on P.C. board for servicing I/F P.C. board has not been removed as required for given model. Check model setting of P.C. board for servicing outdoor I/F P.C. board. L20 Indoor Duplicated central control address There is duplication in central control address setting. Check central control addresses. Check network adaptor P.C. board. L28 L28 I/F Too many outdoor s connected There are more than four outdoor s. Check No. of outdoor s connected (Only up to 4 s per system allowed). Check communication lines between outdoor s. Check for defect in outdoor P.C. board (I/F). 64

65 Main remote controller Check code Outdoor 7-segment display Check code Sub-code Location of detection Description System status Error detection condition(s) Check items (locations) L29 L A 0B 0C 0D 0E 0F A3-IPDU Fan 2 3 IPDU O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O Symbol O signifies site of IPDU. I/F Error in No. of IPDUs Insufficient number of IPDUs are detected when power is turned on. Check model setting of P.C. board for servicing outdoor I/F P.C. board. Check connection of UART communication connector. Check A3-IPDU, fan IPDU, and I/F P.C. board for defect. L30 L30 Detected indoor address Indoor External interlock of indoor Stop of corresponding Signal is present at external input terminal (CN23) for minute. When external device is connected to CN23 connector: ) Check for defect in external device. 2) Check for defect in indoor P.C. board. When external device is not connected to CN23 connector: ) Check for defect in indoor P.C. board. L3 I/F Extended IC Continued operation There is part failure in P.C. board (I/F). Check outdoor P.C. board (I/F). P0 Indoor Indoor fan motor Stop of corresponding Check the lock of fan motor (AC fan). Check wiring. P03 P03 I/F Discharge temperature TD Discharge temperature (TD) exceeds 239 F(5 C) Check outdoor service valves (gas side, liquid side) to confirm full opening. Check outdoor PMVs (PMV, 2, 4) for clogging. Check resistance characteristics of TD sensor. Check for insufficiency in refrigerant quantity. Check for defect in 4-way valve. Check for leakage of SV4 circuit. Check SV4 circuit (wiring or installation in SV4, SV42 or SV43). 65

66 Main remote controller Check code Outdoor 7-segment display Check code Sub-code Location of detection Description System status Error detection condition(s) Check items (locations) P04 P05 P07 P0 P04 P05 P07 P0 0: Compressor side 02: Compressor 2 side 03: Compressor 3 side IPDU Activation of highpressure SW 00: I/F Detection of open phase/phase sequence 0: Compressor side 02: Compressor 2 side 03: Compressor 3 side 0: Compressor side 02: Compressor 2 side 03: Compressor 3 side Detected indoor address P2 IPDU I/F Indoor Indoor Inverter DC voltage (Vdc) (compressor) MG-CTT Heat sink overheating High-pressure SW is activated. Open phase is detected when power is turned on. Inverter DC voltage is too high (overvoltage) or too low (undervoltage). Temperature sensor built into IGBT (TH) is overheated. Indoor overflow Float switch operates. Float switch circuit is open-circuited or disconnected at connector. Indoor fan motor Stop of corresponding Motor speed measurements continuously deviate from target value. Overcurrent protection is activated. Check connection of highpressure SW connector. Check for defect in Pd pressure sensor. Check outdoor service valves (gas side, liquid side) to confirm full opening. Check for defect in outdoor fan. Check for defect in outdoor fan motor. Check outdoor PMVs (PMV, 2) for clogging. Check indoor/outdoor heat exchangers for clogging. Check for short-circuiting of outdoor suction/discharge air flows. Check SV2 circuit for clogging. Check for defect in outdoor P.C. board (I/F). Check for in indoor fan system (possible cause of air flow reduction). Check opening status of indoor PMV. Check indoor-outdoor communication line for wiring. Check for faulty operation of check valve in discharge pipe convergent section. Check gas balancing SV4 valve circuit. Check SV5 valve circuit. Check for refrigerant overcharging. Check for defect in outdoor P.C. board (I/F). Check power supply voltage. Check outdoor fan system. Check heat sink cooling duct for clogging. Check IGBT and heat sink for thermal performance for faulty installation. (e.g. mounting screws and thermal conductivity) Check for defect in A3-IPDU. (faulty IGBT built-in temperature sensor (TH)) Check float switch connector. Check operation of drain pump. Check drain pump circuit. Check drain pipe for clogging. Check for defect in indoor P.C. board. Check connection of fan connector and wiring. Check for defect in fan motor. Check for defect in indoor P.C. board. Check impact of outside air treatment (OA). In the case of incorrect duct setting performed at installation or if an access panel for the maintenance is removed while indoor is in operation MG-CTT: Magnet contactor 66

67 Main remote controller Check code Outdoor 7-segment display Check code Sub-code Location of detection Description System status Error detection condition(s) Check items (locations) P3 P3 P5 P5 P7 P7 P8 P8 I/F Outdoor liquid backflow detection 0: TS condition I/F Gas leakdetection (TS condition) 02: TD condition I/F Gas leak detection (TD condition) I/F I/F Discharge temperature TD2 Discharge temperature TD3 <During cooling operation> When system is in cooling operation, high pressure is detected in follower that has been turned off. <During heating operation> When system is in heating operation, outdoor PMV or 2 continuously registers opening of 00p or less while under SH control. Protective shutdown due to sustained suction temperature at or above judgment criterion for at least 0 minutes is repeated four times or more. <TS judgment criterion> In cooling operation:40 F(60 C) In heatling operation:04 F(40 C) Protective shutdown due to sustained discharge temperature (TD, TD2 or TD3) at or above 226 F(08 C) for at least 0 minutes is repeated four times or more. Discharge temperature (TD2) exceeds 239 F(5 C) Discharge temperature (TD3) exceeds 239 F(5 C) Check full-close operation of outdoor PMV (, 2, 4). Check for defect in Pd or Ps sensor. Check gas balancing circuit (SV2) for clogging. Check balance pipe. Check SV3B circuit for clogging. Check defect in outdoor P.C. board (I/F). Check capillary of oil separator oil return circuit for clogging. Check for leakage of check valve in discharge pipe convergent section. Check for insufficiency in refrigerant quantity. Check outdoor service valves (gas side, liquid side) to confirm full opening. Check PMVs (PMV, 2) for clogging. Check resistance characteristics of TS sensor. Check for defect in 4-way valve. Check SV4 circuit for leakage Check for insufficiency in refrigerant quantity. Check PMVs (PMV, 2) for clogging. Check resistance characteristics of TD, TD2 and TD3 sensors. Check indoor filter for clogging. Check piping for clogging. Check SV4 circuit (for leakage or coil installation ). Check outdoor service valves (gas side, liquid side) to confirm full opening. Check outdoor PMVs (PMV, 2, 4) for clogging. Check resistance characteristics of TD2 sensor. Check for defect in 4-way valve. Check SV4 circuit for leakage. Check SV4 circuit (for wiring or installation involving SV4, SV42 and SV43). Check outdoor service valves (gas side, liquid side) to confirm full opening. Check outdoor PMVs (PMV, 2, 4) for clogging. Check resistance characteristics of TD3 sensor. Check for defect in 4-way valve. Check SV43 circuit for leakage. Check SV4 circuit (for wiring or installation involving SV4, SV42 and SV43). 67

68 Main remote controller Check code Outdoor 7-segment display Check code Sub-code Location of detection Description System status Error detection condition(s) Check items (locations) P9 P9 Detected outdoor No. I/F 4-way valve reversing Abnormal refrigerating cycle data is collected during heating operation. Check for defect in main body of 4-way valve. Check for coil defect in 4- way valve and loose connection of its connector. Check resistance characteristics of TS and TE sensors. Check output voltage characteristics of Pd and Ps pressure sensors. Check for wiring involving TE and TL sensors. P20 P20 I/F Activation of high-pressure protection Pd sensor detects pressure equal to or greater than 522psi(3.6MPa). Check for defect in Pd pressure sensor. Check service valves (gas side, liquid side) to confirm full opening. Check for defect in outdoor fan. Check for defect in outdoor fan motor. Check outdoor PMVs (PMV, 2, 4) for clogging. Check indoor/outdoor heat exchangers for clogging. Check for short-circuiting of outdoor suction/ discharge air flows. Check SV2 circuit for clogging. Check for defect in outdoor P.C. board (I/F). Check for defect in indoor fan system (possible cause of air flow reduction). Check opening status of indoor PMV. Check indoor-outdoor communication line for wiring. Check for faulty operation of check valve in discharge pipe convergent section. Check gas balancing SV4 valve circuit. Check SV5 valve circuit. Check for refrigerant overcharging. 68

69 Main remote controller P22 P26 P29 Check code Outdoor 7-segment display Check code P22 P26 P29 Sub-code 0 : IGBT circuit : Position detection circuit 3 : Motor lockup 4 : Motor current detection C : TH sensor temperature D : TH sensor E : Inverter DC voltage (outdoor fan) Note: Although letters 0 to F appear at locations indicated by, please ignore them. 0: Compressor side 02: Compressor 2 side 03: Compressor 3 side 0: Compressor side 02: Compressor 2 side 03: Compressor 3 side AI-NET central control remote controller A 4 6 P3 47 Location of detection IPDU IPDU IPDU Indoor Description Outdoor fan IPDU G-TR shortcircuit protection Compressor position detection circuit Other indoor (group follower ) System status Error detection condition(s) (Sub code: 0 ) Fan IPDU over current protection circuit Flow of current equal to or greater than the specified value is detected during startup of the fan. (Sub code: ) Fan IPDU position detection circuit Position detection is not going on normally. (Sub code: 3 ) Gusty wind, an obstruction, or another external factor Speed estimation is not going on normally. (Sub code: 4 ) Fan IPDU over current protection circuit Flow of current equal to or greater than the specified value is detected during operation of the fan. (Sub code: C ) Higher temperature than the specified value is detected during operation of the fan. (Sub code: D ) The resistance value of the sensor is infinite or zero (open or short circuit). (Sub code: E ) Fan IPDU DC voltage protection circuit The DC voltage higher or lower than the specified value is detected. Stop of corresponding Overcurrent is momentarily detected during startup of compressor. Position detection is not going on normally. There is in other indoor in group, resulting in detection of E07/L07/L03/ L08. Check items (locations) Check fan motor. Check for defect in fan IPDU P.C. board. Check fan motor. Check connection of fan motor connector. Check for defect in fan IPDU P.C. board. Check fan motor. Check for defect in fan IPDU P.C. board. Check fan motor. Check connection of fan motor connector. Check for defect in fan IPDU P.C. board. Check fan motor. Check for defect in fan IPDU P.C. board. Check for defect in fan IPDU P.C. board. Check power voltage of the main power supply. Check for defect in fan IPDU P.C. board. Check connection of fan IPDU P.C. board. Check connector connection and wiring on A3-IPDU P.C. board. Check for defect in compressor (layer shortcircuit). Check for defect in outdoor P.C. board (A3- IPDU). Check wiring and connector connection. Check for compressor layer short-circuit. Check for defect in A3- IPDU P.C. board. Check indoor P.C. board. 69

70 Errors Detected by TCC-LINK Central Control Device Main remote controller Check code Outdoor 7-segment display Sub-code Location of detection Description System status Error detection condition(s) Check items (locations) C05 TCC-LINK TCC-LINK central control device transmission Continued operation Central control device is unable to transmit signal. Check for defect in central control device. Check for defect in central control communication line. Check termination resistance setting. C06 TCC-LINK central control device reception Continued operation Central control device is unable to receive signal. Check for defect in central control device. Check for defect in central control communication line. Check termination resistance setting. Check power supply for devices at other end of central control communication line. Check defect in P.C. boards of devices at other end of central control communication line. C2 Generalpurpose device I/F Blanket alarm for generalpurpose device control interface Continued operation Error signal is input to control interface for general-purpose devices. Check input. P30 Differs according to nature of alarm-causing (L20 displayed.) TCC-LINK Group control follower Duplicated central control address Continued operation Continued operation Error occurs in follower under group control. ([P30] is displayed on central control remote controller.) There is duplication in central control addresses. Check check code of that has generated alarm. Check address settings. 70

71 8-5. Sensor Characteristics Indoor Unit Temperature sensor characteristics 30 Resistance [kω] (0) 68 (20) 86 (30) 04 (40) 22 (50) 40 (60) Temperature [ F ( C)] 32 (0) 4 (5) 50 (0) 59 (5) 68 (20) 77 (25) 86 (30) 95 (35) 04 (40) 3 (45) 22 (50) 3 (55) 40 (60) Resistance [kω] Temperature [ F ( C)] Indoor TC sensor Resistance [kω] (55 F (0 C) or below) Resistance [kω] (55 F (0 C) or below) (-30) Indoor TC2 and TCJ sensors -22 (-30) -4 (-20) -4 (-20) 4 (-0) 4 (-0) 32 (0) 32 (0) 50 (0) 50 (0) 68 (20) Temperature [ F ( C)] 68 (20) 86 (30) 86 (30) 04 (40) 04 (40) 22 (50) 22 (50) Temperature [ F ( C)] 40 (60) 40 (60) 58 (70) 58 (70) 76 (80) 76 (80) 94 (90) 94 (90) 20 5 Resistance [kω] (55 F (0 C) or above) (00) 20 5 Resistance [kω] (55 F (0 C) or below) (00) Temperature [ F ( C)] -4 (-20) 5 (-5) 4 (-0) 23 (-5) 32 (0) 4 (5) 50 (0) 59 (5) 68 (20) 77 (25) 86 (30) 95 (35) 04 (40) 3 (45) 22 (50) 3 (55) 40 (60) 49 (65) 58 (70) 67 (75) 76 (80) 85 (85) 94 (90) 203 (95) 22 (00) Temperature [ F ( C)] -4 (-20) 5 (-5) 4 (-0) 23 (-5) 32 (0) 4 (5) 50 (0) 59 (5) 68 (20) 77 (25) 86 (30) 95 (35) 04 (40) 3 (45) 22 (50) 3 (55) 40 (60) 49 (65) 58 (70) 67 (75) 76 (80) Resistance [kω] Resistance [kω]

72 WARNING Be sure to turn off the power supply and the breaker and then start a work. 9. DETACHMENTS CAUTION Be sure to put on the gloves at disassembling work; otherwise an injury will be caused by a part, etc. No. Part name Procedure Remarks Electric parts box. Detachment ) Take off screws of the electric parts box cover to remove the electric parts box cover. Screws (For fixing the electric parts box cover) Electric parts box cover Close the claw of the electric parts box cover to notch side of the electric parts box once and then pull out the claw. 2) Remove power supply wire, indoor/ outdoor connecting wire, remote controller wires from each terminal blocks. Claw of electric parts box cover 3) Remove connectors of the fan motor, TC, TC2, TCJ and TA sensor lead wires from the control P.C. board. Remove relay connectors of the drain pump, float SW, and PMV lead wires. PMV relay connector NOTE : First unlock the housing and then remove the connectors. TA sensor Float SW relay connector TC sensor CN20: Fan motor CN00: TC sensor CN0: TC2 sensor CN02: TCJ sensor CN04: TA (Room temperature) sensor 4) Take off screw of the conduit fixed plate and then remove the conduit fixing plate. Drain pump TC2 sensor relay connector Fan motor TCJ sensor Screw (For fixing conduit fixed plate) Screws (For fixing electric parts box) 5) Take off fixing screws of the electric parts box and then remove the electric parts box. Conduit fixed plate Electric parts box 72

73 No. Part name Procedure Remarks Cable clamp Cautions when attaching the electric parts box Using cable clamp, bundle each extra lead wire so that it is not caught in the fan and then attach the electric parts box. After attaching the electric parts box, pull the extra wire in the electric parts box and bundle it with clamp, etc. Cable clamp Cord clamp(for fan motor lead wire) Intake port of PMV, float SW, TC, TC2, TCJ and TA sensor lead wires Intake port of fan motor and drain pump lead wires 2 Silocco fan, fan motor. Detachment ) Take off fixed screws and then remove the base plate. Base plate fixed screw Base plate fixed screw Base plate 73

74 No. Part name Procedure 2) Remove cover of the electric parts box. (Refer to No. ) Remarks TA sensor connector 3) Remove connectors of the fan motor and TA sensor from P.C. board. Fan motor connector Hexagonal screws (For fixing the fan assembly and the main ) 4) Take off hexagonal screws which fix the fan assembly and the main. For MMD-AP02 to 048, take off also screws which fix the fan case to the top plate y 5) Remove the fan assembly from the main. The fan assembly is fixed by the hooking claw at the upper side of the main. Lift up it once and pull downward to remove the hooking claw. 6) Insert the hexagonal wrench as shown in the right figure and loosen the fixed screw of the Silocco fan. Hexagonal wrench Fan base Fan case Fan fixed screw Silocco fan 74

75 No. Part name Procedure 7) Take off screws of the motor band and the motor earth wire. Remarks Fan case Motor band 8) Take off the fan case fixed screws and then pull out the fan case from the fan base. Fan motor Motor earth wire 9) Remove cover of the fan case. Fan case Fan case fixed screws (2 pieces right/left each) 0) Remove the Silocco fan. Cautions when attaching the Silocco fan Attach the Silocco fan in the reverse procedure of detachment Fan case cover ) Place the Silocco fan in the arrow direction as shown in the right figure. 2) Adjust position so that clearance between the Silocco fan and the fan case becomes even and then fix the fan. Attaching direction of Silocco fan 4.5mm or more 4.5mm or more 75

76 No. Part name Procedure Remarks 3 Drain pan. Detachment Fixed screws for the base plate ) Take off fixed screws for the base plate to remove the base plate from the main. 2) Prepare a water receiver; take off the drain cap and then extract drain water accumulated in the drain pan. Base plate NOTE : When taking-off the drain cap, be sure receive drain water using a bucket, etc. Drain pan Screw 3) Take off screws of the drain pan fixed plate to remove the drain pan fixed plate. MMD-AP007 to AP02: none MMD-AP05 to AP08: position MMD-AP02 to AP048: 2 positions Drain cap Drain pan fixed plate 4) Remove the drain pan from the main. 4 Float switch Float switch. Detachment ) Remove the drain pan. (Refer to No. 3 ) 2) Take off screws of the float switch fixed plate. Fixed screws for the float switch Float switch fixed base Float switch (Viewed from opposite side) 3) Remove the plastic nut for fixing the float switch. 4) Remove the float switch. Float switch fixed base Plastic nut 76

77 No. Part name Procedure Remarks 5 Drain pump. Detachment ) Remove the drain pan.(refer to No. 3 ) Drain pump Fixing screws of the drain pump fixed plate (4 positions) 2) Take off screws for the fixed plate of the main and the pump. (4 positions) Screws for fixing drain pump Drain pump fixed plate 3) Take off screws of the drain pump fixed plate to remove the drain pump. 6 TC, TC2, TCJ sensors. Detachment Mounting screws for check port cover ) Take off fixing screw for the check port cover at right side. (5 positions) 2) Pull and take off the sensors from the sensor holder of piping. Check port cover (A) TCJ sensor Tube color: Red TC sensor Tube color: Blue TC2 sensor Tube color: Black 77

78 No. Part name Procedure Remarks 7 Heat exchanger. Detachment NOTE : Recover refrigerant gas and then remove the refrigerant piping of the indoor.remove the indoor and carry out the work on the floor. etc. Check port cover (B) ) Remove the drain pan.(refer to No. 3 ) Remove TC sensor, TC2 sensor and TCJ sensor from the sensor holder. Remove the relay connector of PMV lead wire in the electric parts and then pull off it from the bushing. 2) Remove the check port cover (A). (Refer to No. 6 ) Check port cover fixing screws 3) Take off fixing screw and remove cover (B). Side plate (Left) 4) Take off the heat exchanger fixing screws (2 positions) which fix the side plate (Left) and the heat exchanger. Heat exchanger fixing screws Main (Front side) 5) Take off screws which fix the main (Front side) and the heat exchanger to remove the heat exchanger. Heat exchanger fixing screws (Front side) 78