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Table of Contents

   Summary of Contents for Mitsubishi Electric PURY-P72

  • Page 2: Safety Precautions

    Safety Precautions Before installing the unit, thoroughly read the following safety precautions. Observe these safety precautions for your safety. WARNING This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid the risk of serious injury or death.
  • Page 3 WARNING Securely attach the terminal block cover (panel) to the After completing the service work, check for a gas unit. leak. If the terminal block cover (panel) is not installed properly, If leaked refrigerant is exposed to a heat source, such as a dust and/or water may infiltrate and pose a risk of electric fan heater, stove, or electric grill, poisonous gases may be shock, smoke, and/or fire.
  • Page 4 Precautions for handling units for use with R410A CAUTION Do not use the existing refrigerant piping. Use a vacuum pump with a reverse-flow check valve. A large amount of chlorine that is contained in the residual If a vacuum pump that is not equipped with a reverse-flow refrigerant and refrigerator oil in the existing piping may check valve is used, the vacuum pump oil may flow into the cause the refrigerator oil in the new unit to deteriorate.
  • Page 5: Before Installing The Unit

    Before installing the unit WARNING Do not install the unit where a gas leak may occur. When installing the unit in a hospital, take appropriate measures to reduce noise interference. If gaseous refrigerant leaks and piles up around the unit, it may be ignited.
  • Page 6 Before installing the unit (moving and reinstalling the unit) and performing electrical work CAUTION Properly ground the unit. Periodically check the installation base for damage. Do not connect the grounding wire to a gas pipe, water pipe, If the unit is left on a damaged platform, it may fall and lightning rod, or grounding wire from a telephone pole.
  • Page 7 Before the test run CAUTION Turn on the unit at least 12 hours before the test run. Do not operate the unit without panels and safety guards. Keep the unit turned on throughout the season. If the unit is turned off in the middle of a season, it may result in malfunc- Rotating, high-temperature, or high-voltage parts on the unit tions.
  • Page 8: Table Of Contents

    CONTENTS I Read Before Servicing [1] Read Before Servicing......................3 [2] Necessary Tools and Materials ....................4 [3] Piping Materials ........................5 [4] Storage of Piping ........................7 [5] Pipe Processing........................7 [6] Brazing............................8 [7] Air Tightness Test........................9 [8] Vacuum Drying (Evacuation) ....................
  • Page 9 CONTENTS IX Troubleshooting [1] Error Code Lists........................179 [2] Responding to Error Display on the Remote Controller............182 [3] Investigation of Transmission Wave Shape/Noise ............... 270 [4] Troubleshooting Principal Parts.................... 273 [5] Refrigerant Leak ........................314 [6] Compressor Replacement Instructions................. 316 [7] Servicing the BC controller ....................
  • Page 10 I Read Before Servicing [1] Read Before Servicing ....................... 3 [2] Necessary Tools and Materials..................4 [3] Piping Materials ......................... 5 [4] Storage of Piping ....................... 7 [5] Pipe Processing ......................... 7 [6] Brazing..........................8 [7] Air Tightness Test ......................9 [8] Vacuum Drying (Evacuation) ...................
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  • Page 12: Read Before Servicing

    [ I Read Before Servicing ] I Read Before Servicing [1] Read Before Servicing 1. Check the type of refrigerant used in the system to be serviced. Refrigerant Type Multi air conditioner for building application CITY MULTI R2 THMU-A, YHMU-A series R410A 2.
  • Page 13: Necessary Tools And Materials

    [ I Read Before Servicing ] [2] Necessary Tools and Materials Prepare the following tools and materials necessary for installing and servicing the unit. Tools for use with R410A (Adaptability of tools that are for use with R22 or R407C) 1.
  • Page 14: Piping Materials

    [ I Read Before Servicing ] [3] Piping Materials Do not use the existing piping! 1. Copper pipe materials O-material (Annealed) Soft copper pipes (annealed copper pipes). They can easily be bent with hands. 1/2H-material (Drawn) Hard copper pipes (straight pipes). They are stronger than the O-material (Annealed) at the same radial thickness.
  • Page 15 [ I Read Before Servicing ] 4. Thickness and refrigerant type indicated on the piping materials Ask the pipe manufacturer for the symbols indicated on the piping material for new refrigerant. 5. Flare processing (O-material (Annealed) and OL-material only) The flare processing dimensions for the pipes that are used in the R410A system are larger than those in the R22 system. Flare processing dimensions (mm[in.]) A dimension (mm) Pipe size (mm[in.])
  • Page 16: Storage Of Piping

    [ I Read Before Servicing ] [4] Storage of Piping 1. Storage location Store the pipes to be used indoors. (Warehouse at site or owner's warehouse) If they are left outdoors, dust, dirt, or moisture may infiltrate and contaminate the pipe. 2.
  • Page 17: Brazing

    [ I Read Before Servicing ] [6] Brazing No changes have been made in the brazing procedures. Perform brazing with special care to keep foreign objects (such as oxide scale, water, and dust) out of the refrigerant system. Example: Inside the brazed connection Use of oxidized solder for brazing Use of non-oxidized solder for brazing 1.
  • Page 18: Air Tightness Test

    [ I Read Before Servicing ] [7] Air Tightness Test No changes have been made in the detection method. Note that a refrigerant leak detector for R22 will not detect an R410A leak. Halide torch R22 leakage detector 1. Items to be strictly observed Pressurize the equipment with nitrogen up to the design pressure (4.15MPa[601psi]), and then judge the equipment's air tight- ness, taking temperature variations into account.
  • Page 19: Vacuum Drying (evacuation)

    [ I Read Before Servicing ] [8] Vacuum Drying (Evacuation) (Photo1) 15010H (Photo2) 14010 Recommended vacuum gauge: ROBINAIR 14010 Thermistor Vacuum Gauge 1. Vacuum pump with a reverse-flow check valve (Photo1) To prevent the vacuum pump oil from flowing into the refrigerant circuit during power OFF or power failure, use a vacuum pump with a reverse-flow check valve.
  • Page 20 [ I Read Before Servicing ] 7. Notes To evacuate air from the entire system Applying a vacuum through the check joints at the refrigerant service valve on the high and low pressure sides (BV1 and 2) is not enough to attain the desired vacuum pressure. Be sure to apply a vacuum through the check joints at the refrigerant service valve on the high and low pressure sides (BV1 and 2) and also through the check joints on the high and low pressure sides (CJ1 and 2).
  • Page 21: Refrigerant Charging

    [ I Read Before Servicing ] [9] Refrigerant Charging Cylinder with a siphon Cylinder without a siphon Cylin- Cylin- Cylinder color R410A is pink. Refrigerant charging in the liquid state Valve Valve liquid liquid 1. Reasons R410A is a pseudo-azeotropic HFC blend (boiling point R32=-52°C[-62°F], R125=-49°C[-52°F]) and can almost be handled the same way as a single refrigerant, such as R22.
  • Page 22: Characteristics Of The Conventional And The New Refrigerants

    [ I Read Before Servicing ] [11] Characteristics of the Conventional and the New Refrigerants 1. Chemical property As with R22, the new refrigerant (R410A) is low in toxicity and chemically stable nonflammable refrigerant. However, because the specific gravity of vapor refrigerant is greater than that of air, leaked refrigerant in a closed room will accumulate at the bottom of the room and may cause hypoxia.
  • Page 23: Notes On Refrigerating Machine Oil

    [ I Read Before Servicing ] [12] Notes on Refrigerating Machine Oil 1. Refrigerating machine oil in the HFC refrigerant system HFC type refrigerants use a refrigerating machine oil different from that used in the R22 system. Note that the ester oil used in the system has properties that are different from commercially available ester oil. Refrigerant Refrigerating machine oil Mineral oil...
  • Page 24: Restrictions

    II Restrictions [1] System configuration ....................... 17 [2] Types and Maximum allowable Length of Cables ............18 [3] Switch Settings and Address Settings ................19 [4] Sample System Connection..................... 25 [5] An Example of a System to which an MA Remote Controller is connected..... 26 [6] An Example of a System to which an M-NET Remote Controller is connected....
  • Page 25 - 16 -...
  • Page 26: System Configuration

    [ II Restrictions ] II Restrictions [1] System configuration 1. Table of compatible indoor units The table below summarizes the types of indoor units that are compatible with different types of outdoor units. Outdoor Composing units Maximum total capacity Maximum number Types of connectable in- units of connectable indoor...
  • Page 27: Types And Maximum Allowable Length Of Cables

    [ II Restrictions ] [2] Types and Maximum allowable Length of Cables 1. Wiring work (1) Notes 1) Have all electrical work performed by an authorized electrician according to the local regulations and instructions in this man- ual. 2) Install external transmission cables at least 5cm [1-31/32"] away from the power supply cable to avoid noise interference. (Do not put the control cable and power supply cable in the same conduit tube.) 3) Provide grounding for the outdoor unit as required.
  • Page 28: Switch Settings And Address Settings

    [ II Restrictions ] 2) Remote controller wiring MA remote controller M-NET remote controller Type VCTF, VCTFK, CVV, CVS, VVR, VVF, VCT Shielded cable MVVS Number of 2-core cable 2-core cable cores Cable type 2 *3 2 *3 0.3 to 1.25mm 0.3 to 1.25mm [AWG22 to 16] [AWG22 to 16]...
  • Page 29 [ II Restrictions ] 2. M-NET Address settings (1) Address settings table The need for address settings and the range of address setting depend on the configuration of the system. Unit or controller Sym- Address Setting method Factory setting address range setting CITY MULTI...
  • Page 30 [ II Restrictions ] (2) Power supply switch connector connection on the outdoor unit (Factory setting: The male power supply switch connector is connected to CN41.) There are limitations on the total number of units that are connectable to each refrigerant system. Refer to the System Design Manual for details.
  • Page 31 [ II Restrictions ] (5) Various start-stop controls (Indoor unit settings) Each indoor unit (or group of indoor units) can be controlled individually by setting SW 1-9 and 1-10. *4 *5 Setting (SW1) Operation of the indoor unit when the operation is resumed after the unit Function was stopped Power ON/OFF by the...
  • Page 32 [ II Restrictions ] CAUTION 1) Wiring should be covered by insulation tube with supplementary insulation. 2) Use relays or switches with IEC or equivalent standard. 3) The electric strength between accessible parts and control circuit should have 2750V or more. Example of wiring connection (1) CN51 (2) CN3S...
  • Page 33 [ II Restrictions ] 1) SW4-4: OFF (Compressor ON/OFF, Low-noise mode) CN3D 1-3P Compressor ON/OFF Open Compressor ON Short-circuit Compressor OFF CN3D 1-2P Low-noise mode Open Short-circuit *1. When SW4-4 on the outdoor unit in one refrigerant circuit system is set to ON , this function cannot be used. *2.
  • Page 34: Sample System Connection

    [ II Restrictions ] [4] Sample System Connection Examples of typical system connection are shown on pages [5] to [7]. Refer to the Installation Manual that came with each device or controller for details. (1) An example of a system to which an MA remote controller is connected System Address start up for in- Connection to the system controller...
  • Page 35: An Example Of A System To Which An Ma Remote Controller Is Connected

    [ II Restrictions ] [5] An Example of a System to which an MA Remote Controller is connected 1. System with one outdoor unit (automatic address setup for both indoor and outdoor units) (1) Sample control wiring Interlock operation with the ventilation unit Leave the male Leave the male...
  • Page 36 [ II Restrictions ] (4) Wiring method Set one of the MA remote controllers as a sub controller. (Refer to the Instruction Manual for the MA remote con- 1) Indoor/outdoor transmission line troller for the setting method.) Daisy-chain terminals M1 and M2 of the terminal block Group operation of indoor units for indoor-outdoor transmission line (TB3) on the outdoor To perform a group operation of indoor units (IC), daisy-...
  • Page 37 [ II Restrictions ] 2. An example of a system with one outdoor unit to which 2 or more LOSSNAY units are connected (manual address setup for both indoor and outdoor units) (1) Sample control wiring Interlock operation with the ventilation unit Leave the male Leave the male Group...
  • Page 38 [ II Restrictions ] 2) Transmission line for centralized control (4) Wiring method No connection is required. 1) Indoor/outdoor transmission line Daisy-chain terminals M1 and M2 of the terminal block 3) MA remote controller wiring for indoor-outdoor transmission line (TB3) on the outdoor Same as [5] 1.
  • Page 39 [ II Restrictions ] 3. Group operation of units in a system with multiple outdoor units (1) Sample control wiring Interlock operation with the ventilation unit CN41 CN40 Replace Leave the male Group Group Group SW2-1 OFF connector on CN41 as it is. SW2-1 OFF TB15 TB15...
  • Page 40 [ II Restrictions ] (4) Wiring method Shielded cable connection Daisy-chain the S terminal on the terminal block (TB7) on 1) Indoor/outdoor transmission line the outdoor units (OC, OS) with the shield wire of the Same as [5] 2. shielded cable. Short-circuit the earth terminal ( ) and Shielded cable connection the S terminal on the terminal block (TB7) on the outdoor...
  • Page 41 [ II Restrictions ] 4. A system in which a system controller is connected to the transmission line for centralized control and which is pow- ered from an outdoor unit (1) Sample control wiring Interlock operation with the ventilation unit CN41 CN40 Replace Leave the male SW2-1 OFF...
  • Page 42 [ II Restrictions ] Daisy-chain the S terminal of the terminal block (TB7) on (4) Wiring method the system controller, OC, and OS with the shield of the 1) Indoor/outdoor transmission line shielded cable. Short-circuit the earth terminal ( ) and Same as [5] 2.
  • Page 43 [ II Restrictions ] 5. An example of a system in which a system controller is connected to the indoor-outdoor transmission line (except LM adapter) (1) Sample control wiring Interlock operation with the ventilation unit CN41 CN40 Replace Leave the male SW2-1 OFF ON connector on CN41 as it is.
  • Page 44 [ II Restrictions ] Only use shielded cables. (4) Wiring method Shielded cable connection 1) Indoor/outdoor transmission line Daisy-chain the S terminal on the terminal block (TB7) on the out- door units (OC, OS) with the shield wire of the shielded cable. Short- Daisy-chain terminals M1 and M2 of the terminal block for indoor- circuit the earth terminal ( ) and the S terminal on the terminal...
  • Page 45 [ II Restrictions ] 6. An example of a system in which a system controller is connected to the indoor-outdoor transmission line (except LM adapter) (1) Sample control wiring Leave the male CN41 CN40 Replace connector on SW2-1 OFF ON CN41 as it is.
  • Page 46 [ II Restrictions ] door units to "ON." (4) Wiring method Only use shielded cables. 1) Indoor/outdoor transmission line Shielded cable connection Daisy-chain terminals M1 and M2 of the terminal block for indoor- Daisy-chain the S terminal of the terminal block (TB7) on the system outdoor transmission line (TB3) on the outdoor units (OC and OS), controller, OC, and OS with the shield of the shielded cable.
  • Page 47: An Example Of A System To Which An M-net Remote Controller Is Connected

    [ II Restrictions ] [6] An Example of a System to which an M-NET Remote Controller is connected (1) Sample control wiring Interlock operation with the ventilation unit CN41 CN40 Replace Leave the male connector on SW2-1 OFF ON CN41 as it is. Group Group Group...
  • Page 48 [ II Restrictions ] When 2 remote controllers are connected to the sys- (4) Wiring method 1) Indoor/outdoor transmission line Refer to the section on Switch Setting. Same as [5] 3. Performing a group operation (including the group Shielded cable connection operation of units in different refrigerant circuits).
  • Page 49: An Example Of A System To Which Both Ma Remote Controller And M-net Remote Controller Are Connected

    [ II Restrictions ] [7] An Example of a System to which both MA Remote Controller and M-NET Remote Controller are connected (1) Sample control wiring CN41 CN40 Replace Leave the male SW2-1 OFF ON Group Group connector on CN41 as it is. SW2-1 OFF ON TB15 TB15...
  • Page 50 [ II Restrictions ] Group operation of indoor units (4) Wiring method Same as [5] 1. 1) Indoor/outdoor transmission line 4) M-NET remote controller wiring Same as [5] 3. When 2 remote controllers are connected to the sys- Shielded cable connection Same as [5] 1.
  • Page 51 [ II Restrictions ] (5) Address setting method Pro- dress Facto- Unit or controller set- Setting method Notes ry set- dure ting ting range Opera- Main 01 to Assign the smallest address to Assign an address smaller than that of the main unit in the group.
  • Page 52: Restrictions On Pipe Length

    [ II Restrictions ] [8] Restrictions on Pipe Length (1) System that requires 16 BC controller ports or fewer <System with only the main BC controller or standard BC con- troller> Outdoor unit *Use a main BC controller when connecting the outdoor units of P144 model or above.
  • Page 53 [ II Restrictions ] The height difference and the pipe length between BC controller and indoor units Restrictions on pipe length [PURY-P72, P96THMU-A, PURY-P72, P96YHMU-A] 1000 [229] [3280] [2952] [196] [2624] [164] [2296] [131] [1968] [98] [1640] [64] [1312] [32]...
  • Page 54 [ II Restrictions ] (2) System that requires more than 16 BC controller ports or with multiple BC controllers <Outdoor unit P120 model or below.> Outdoor unit Branch joint Indoor (CMY-Y202-G2) (CMY-Y102L-G2) (CMY-Y102S-G2) BC controller (sub) BC controller (main) Branch joint (CMY-Y102S-G2) BC controller (sub) Reducer (P06 - P18 models)
  • Page 55 [ II Restrictions ] 1) A system that requires more than 16 BC controller ports requires two or three BC controllers (main and sub), and three pipes will be used between the main and the sub BC controllers. 2) When connecting two sub BC controllers, observe the maximum allowable length in the table above. 3) When connecting two sub BC controllers, install them in parallel.
  • Page 56 [ II Restrictions ] (3) System that requires more than 16 BC controller ports or with multiple BC controllers <Outdoor unit P144 model or above.> Branch joint (CMY-R100VBK) Outdoor unit The distributor on the low-pressure side must be placed in the outdoor unit that has a larger capacity Outdoor unit index of the two, regardless of the relative positions of the outdoor units or their addresses.
  • Page 57 [ II Restrictions ] 1) A system that requires more than 16 BC controller ports requires two or three BC controllers (main and sub), and three pipes will be used between the main and the sub BC controllers. 2) When connecting two sub BC controllers, observe the maximum allowable length in the table above. 3) When connecting two sub BC controllers, install them in parallel.
  • Page 58 [ II Restrictions ] Restrictions on pipe length [PURY-P144, P168TSHMU-A] [PURY-P192TSHMU-A] [PURY-P144, P168YSHMU-A] [PURY-P192YSHMU-A] 1000 1000 [3280] [3280] [2952] [2952] [2624] [2624] [2296] [2296] [1968] [1968] [1640] [1640] [1312] [1312] [984] [984] [656] [656] 90 100 90 100 [32] [64] [98] [131] [164] [196] [229] [262] [295] [328] [360] [32] [64] [98] [131] [164] [196] [229] [262] [295] [328] [360] Pipe length between outdoor unit and BC controller (m[ft]) Pipe length between outdoor unit and BC controller (m[ft])
  • Page 59 [ II Restrictions ] 1. Refrigerant pipe size (1) Between outdoor unit and the first twinning pipe (Part A) Unit : mm [inch] Refrigerant pipe size Connection to outdoor unit and BC controller Outdoor units Low-pressure pipe High-pressure pipe Low-pressure pipe High-pressure pipe ø19.05 [3/4"] ø15.88 [5/8"]...
  • Page 60 [ II Restrictions ] 2. Connecting the BC controller (1) Size of the pipe that fits the standard BC controller ports P72 - P120 models Connection: Brazed connection To outdoor unit BC controller Reducer Branch joint (Model name:CMY-Y102S-G2) Junction pipe kit (Standard (Optional accessory) (Model name:...
  • Page 61 [ II Restrictions ] 1) To connect P06 - P18 models of indoor units use 2) To connect P36 - P96 models of indoor units (or when the the reducer that is supplied with the BC controller. total capacity of indoor units exceeds P31), use a junction pipe kit and merge the two nozzles.
  • Page 62 [ II Restrictions ] (2) Size of the pipe that fits the main BC controller ports P72 - P240 models Branch joint (Model name:CMY-Y102S-G2) (Optional accessory) Connection: Brazed connection To outdoor unit BC controller (main) Reducer (Standard supplied parts) Junction pipe kit (Model name:CMY-R160-J) (Optional accessory) Indoor...
  • Page 63 [ II Restrictions ] (3) Size of the pipe that fits the sub BC controller ports Branch joint (Model name:CMY-Y102S-G2) Connection: Brazed connection (Optional accessory) To Main BC controller Junction pipe kit BC controller (sub) (Model name: CMY-R160-J) (Optional accessory) Reducer (Standard supplied parts) Indoor...
  • Page 64: Outdoor Unit Components

    III Outdoor Unit Components [1] Outdoor Unit Components and Refrigerant Circuit ............57 [2] Control Box of the Outdoor Unit..................60 [3] Outdoor Unit Circuit Board....................64 [4] BC Controller Components ....................74 [5] Control Box of the BC Controller..................77 [6] BC Controller Circuit Board....................
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  • Page 66: Outdoor Unit Components And Refrigerant Circuit

    [ III Outdoor Unit Components ] III Outdoor Unit Components [1] Outdoor Unit Components and Refrigerant Circuit 1. Front view of a outdoor unit (1) PURY-P72, P96, P120THMU-A PURY-P72, P96, P120YHMU-A Fan guard Control Heat exchanger Front panel Fin guard...
  • Page 67 [ III Outdoor Unit Components ] 2. Refrigerant circuit (1) PURY-P72THMU-A PURY-P72YHMU-A High-pressure switch (63H1) Low pressure sensor (63LS) High pressure sensor (63HS1) Check valve(CV7a) Transformer box (YHMU-A only) 4-way valve(21S4a) Accumulator (ACC) Solenoid valve(SV2) Compressor cover Solenoid valve (SV1a) Solenoid valve(SV9) Oil separator (O/S) Check valve(CV5a)
  • Page 68 [ III Outdoor Unit Components ] (2) PURY-P96, P120THMU-A PURY-P96, P120YHMU-A Low pressure sensor(63LS) Solenoid valve(SV2) High-pressure switch (63H1) High pressure sensor (63HS1) Transformer box Check valve(CV7a) (YHMU-A only) Accumulator 4-way valve(21S4a) (ACC) Compressor cover Solenoid valve(SV9) Solenoid valve (SV1a) Check valve(CV5a) Compressor(COMP) Oil separator (O/S)
  • Page 69: Control Box Of The Outdoor Unit

    [ III Outdoor Unit Components ] [2] Control Box of the Outdoor Unit <HIGH VOLTAGE WARNING> Control box houses high-voltage parts. When opening or closing the front panel of the control box, do not let it come into contact with any of the internal components.
  • Page 70 [ III Outdoor Unit Components ] 2. PURY-P96, P120THMU-A Note.2 Fan board INV board Control board DC reactor (DCL) Electromagnetic relay (72C) Diode stack Noise filter Current sensor (ACCT3) M-NET board Current sensor (DCCT1) Terminal block for power supply (TB1) Current sensor Ground terminal Note.1...
  • Page 71 [ III Outdoor Unit Components ] 3. PURY-P72, P96, P120YHMU-A Capacitor(C100) Rush current protection resistor (R1,R5) Note.2 Electromagnetic relay(72C) Fan board Control board DC reactor (DCL) Noise filter M-NET board Terminal block for power supply (TB1) Fuse(F4) Terminal block for transmission line...
  • Page 72 [ III Outdoor Unit Components ] 4. Transformer Box (PURY-P72, P96, P120Y(T)HMU-A) Transformer (T03) Transformer (T02) HWE0803A - 63 -...
  • Page 73: Outdoor Unit Circuit Board

    [ III Outdoor Unit Components ] [3] Outdoor Unit Circuit Board 1. Outdoor unit control board CN332 CNDC Serial communication signal input Output 18VDC CN801 Bus voltage input GND INV board Pressure switch Output 17VDC connection (Fan board) Serial communication signal output CNAC2 CN505 72C driving output...
  • Page 74 [ III Outdoor Unit Components ] 2. M-NET board CNS2 CNIT CN102 CN04 Input 12VDC Transmission line Bus voltage input Power supply output for centralized CN03(THMU only) input/output for (YHMU only) control system (30VDC) (THMU only) Input 5VDC Bus voltage input centralized control Bus voltage output Indoor/outdoor transmission line...
  • Page 75 [ III Outdoor Unit Components ] 3. INV board (1) PURY-P72THMU-A Open: No-load operation setting CN5V Short-circuited: Normal setting SC-P1 Rectifier diode output (P) Output 5VDC LED1 Lit: Inverter in normal operation Blink: Inverter error IGBT (Rear) GND(INV Boar) Serial communication signal output C30,31,32 Smoothing capacitor CNDC...
  • Page 76 [ III Outdoor Unit Components ] (2) PURY-P96, P120THMU-A CNCT3 CNTH Current (AC) sensor input Thermistor input (ACCT3) LED2 (THHS) CNTYP CNCT2 Inverter error Function setting input Current (AC) sensor input (Z26) LED4 ACCT1 LED1 Lit during normal Inverter in ACCT2 normal operation CPU operation...
  • Page 77 [ III Outdoor Unit Components ] (3) PURY-P72, P96, P120YHMU-A SC-P1 Rectifier diode output (P) Open: No-load operation setting CN5V RSH1 SC-P2 Short-circuited: Normal setting LED1 Overcurrent detection Bus voltage Input(P) Lit: Inverter in normal operation Output 5VDC resistor Blink: Inverter error...
  • Page 78 [ III Outdoor Unit Components ] 4. Fan board (1) PURY-P72, P96, P120THMU-A CNVDC Bus voltage input Serial communication signal output CN18V LED3 Fuse Input 18VDC GND Control board Lit during normal 250VAC 15A Serial communication signal output CPU operation...
  • Page 79 [ III Outdoor Unit Components ] (2) PURY-P72, P96, P120YHMU-A LED3 CN18V Lit during normal Input 18VDC Serial communication signal output CPU operation GND(Control board) Serial communication signal output CN21 Serial communication signal output GND(INV board) CNVDC Input 17VDC Bus voltage input...
  • Page 80 [ III Outdoor Unit Components ] 5. Noise Filter (1) PURY-P72THMU-A TB21 CN02 Input/output L1 Output Grounding TB22 Input/output L2 Fuse 250VAC 6.3A TB23 Input/output L3 Fuse 250VAC 6.3A CN01 Input HWE0803A - 71 -...
  • Page 81 [ III Outdoor Unit Components ] (2) PURY-P96, P120THMU-A R1,2 TB42 TB31 CN03 Rush current Bus voltage output N Bus voltage output P 72C drive input protection resistor Electromagnetic relay Fuse 250VAC 6.3A Diode stack rectified voltage Grounding input (Diode stack output) Output Diode stack input CN02...
  • Page 82 [ III Outdoor Unit Components ] (3) PURY-P72, P96, P120YHMU-A Output Output (Rectified L2-L3 current) (Rectified L2-L3 current) Input Surge absorber circuit Surge absorber circuit Short circuit Short circuit Grounding F1,F2,F3,F4 Fuse 250VAC 6.3A Grounding CN1A Input CN1B TB21 TB22...
  • Page 83: Bc Controller Components

    [ III Outdoor Unit Components ] [4] BC Controller Components 1. CMB-P NU-G, GA (1) Front Liquid pipe (Indoor unit side) Gas pipe (Indoor unit side) (2) Rear view <G type> TH11 SVM1 LEV3 LEV1 Gas/Liquid separator TH16 Tube in tube heat exchanger TH12 TH15 HWE0803A...
  • Page 84 [ III Outdoor Unit Components ] (3) Rear view <GA type> TH16 LEV2 LEV3 TH11 LEV1 SVM2 Gas/Liquid separator Tube in tube heat exchanger SVM1 TH12 TH15 HWE0803A - 75 -...
  • Page 85 [ III Outdoor Unit Components ] 2. CMB-P NU-GB, HB (1) Front Liquid pipe (Indoor unit side) Gas pipe (Indoor unit side) (2) Rear view TH12 LEV3 TH15 HWE0803A - 76 -...
  • Page 86: Control Box Of The Bc Controller

    [ III Outdoor Unit Components ] [5] Control Box of the BC Controller 1. CMB-P1016NU-G, GA Transformer Terminal block for power supply Terminal block for transmission line Relay board BC controller board HWE0803A - 77 -...
  • Page 87: Bc Controller Circuit Board

    [ III Outdoor Unit Components ] [6] BC Controller Circuit Board 1. BC controller circuit board (BC board) HWE0803A - 78 -...
  • Page 88 [ III Outdoor Unit Components ] 2. RELAY BOARD (RELAY 4 board) 3. RELAY BOARD (RELAY 10 board) HWE0803A - 79 -...
  • Page 89 - 80 -...
  • Page 90: Remote Controller

    IV Remote Controller [1] Functions and Specifications of MA and ME Remote Controllers ........83 [2] Group Settings and Interlock Settings via the ME Remote Controller ......84 [3] Interlock Settings via the MA Remote Controller ............. 88 [4] Using the built-in Temperature Sensor on the Remote Controller ........89 HWE0803A - 81 -...
  • Page 91 - 82 -...
  • Page 92: Functions And Specifications Of Ma And Me Remote Controllers

    [ IV Remote Controller ] IV Remote Controller [1] Functions and Specifications of MA and ME Remote Controllers There are two types of remote controllers: M-NET (ME) remote controller, which is connected on the indoor-outdoor transmission line, and MA remote controller, which is connected to each indoor unit. 1.
  • Page 93: Group Settings And Interlock Settings Via The Me Remote Controller

    [ IV Remote Controller ] [2] Group Settings and Interlock Settings via the ME Remote Controller 1. Group settings/interlock settings Make the following settings to perform a group operation of units that are connected to different outdoor units or to manually set up the indoor/outdoor unit address.
  • Page 94 [ IV Remote Controller ] Repeat steps in the previous page to interlock all the indoor units in a group with the LOSSNAY unit. (C) To return to the normal display When all the group settings and interlock settings are made, take the To go back to the normal display, To search for an address, follow step...
  • Page 95 [ IV Remote Controller ] (A) To delete group settings (B) To delete interlock settings <Successful completion of deletion> If deletion is successfully completed, will appear in the unit type display window. If the deletion fails, will (Displayed alternately) will be displayed in the room temperature display window. appear in the unit type display - If a transmission error occurs, the selected setting will not be window.
  • Page 96 [ IV Remote Controller ] [Operation Procedures] 1. Press the [ON/OFF] button on the remote controller to bring the unit to a stop. The display will appear as shown in the previous page (Normal display). 2. Press buttons [CHECK] and [ ] simultaneously for 2 seconds to go into the “Skip-Auto-Mode setting.”...
  • Page 97: Interlock Settings Via The Ma Remote Controller

    [ IV Remote Controller ] [3] Interlock Settings via the MA Remote Controller 1. LOSSNAY interlock setting (Make this setting only when making an interlock settings between the LOSSNAY units and the Freeplan model of units.) Make this setting only when necessary. Perform this operation to enter the interlock setting between the LOSSNAY and the indoor units to which the remote controller is connected, or to search and delete registered information.
  • Page 98: Using The Built-in Temperature Sensor On The Remote Controller

    [ IV Remote Controller ] < 2. Search Procedures > To search for the LOSSNAY unit that is interlocked with a particular indoor unit, enter the address of the indoor unit into the remote controller that is connected to it. <Indoor unit address>...
  • Page 99 - 90 -...
  • Page 100: Electrical Wiring Diagram

    V Electrical Wiring Diagram [1] Electrical Wiring Diagram of the Outdoor Unit ..............93 [2] Electrical Wiring Diagram of the BC Controller ..............96 [3] Electrical Wiring Diagram of Transmission Booster............105 HWE0803A - 91 -...
  • Page 101 - 92 -...
  • Page 102: Electrical Wiring Diagram Of The Outdoor Unit

    [ V Electrical Wiring Diagram ] V Electrical Wiring Diagram [1] Electrical Wiring Diagram of the Outdoor Unit (1) PURY-P72THMU-A HWE0803A - 93 -...
  • Page 103 [ V Electrical Wiring Diagram ] (2) PURY-P96, P120THMU-A HWE0803A - 94 -...
  • Page 104 [ V Electrical Wiring Diagram ] (3) PURY-P72, P96, P120YHMU-A HWE0803A - 95 -...
  • Page 105: Electrical Wiring Diagram Of The Bc Controller

    [ V Electrical Wiring Diagram ] [2] Electrical Wiring Diagram of the BC Controller (1) CMB-P104NU-G model HWE0803A - 96 -...
  • Page 106 [ V Electrical Wiring Diagram ] (2) CMB-P105,106NU-G models HWE0803A - 97 -...
  • Page 107 [ V Electrical Wiring Diagram ] (3) CMB-P108,1010NU-G models HWE0803A - 98 -...
  • Page 108 [ V Electrical Wiring Diagram ] (4) CMB-P1013,1016NU-G models HWE0803A - 99 -...
  • Page 109 [ V Electrical Wiring Diagram ] (5) CMB-P108,1010NU-GA models HWE0803A - 100 -...
  • Page 110 [ V Electrical Wiring Diagram ] (6) CMB-P1013,1016NU-GA models LEV3 LEV2 HWE0803A - 101 -...
  • Page 111 [ V Electrical Wiring Diagram ] (7) CMB-P104NU-GB model HWE0803A - 102 -...
  • Page 112 [ V Electrical Wiring Diagram ] (8) CMB-P108NU-GB model HWE0803A - 103 -...
  • Page 113 [ V Electrical Wiring Diagram ] (9) CMB-P1016NU-HB model HWE0803A - 104 -...
  • Page 114: Electrical Wiring Diagram Of Transmission Booster

    [ V Electrical Wiring Diagram ] [3] Electrical Wiring Diagram of Transmission Booster Terminal block for power supply (TB1) 250V 5A Red Red Red Black White White Green/Yellow 100V/200VAC Varistor Noise filter Black White White White White Varistor Green Black Stabilized power supply Blue Black...
  • Page 115 - 106 -...
  • Page 116: Refrigerant Circuit

    VI Refrigerant Circuit [1] Refrigerant Circuit Diagram ................... 109 [2] Principal Parts and Functions ..................116 HWE0803A - 107 -...
  • Page 117 - 108 -...
  • Page 118: Refrigerant Circuit Diagram

    [ VI Refrigerant Circuit ] VI Refrigerant Circuit [1] Refrigerant Circuit Diagram 1. Outdoor unit (1) PURY-P72 model 21S4a Solenoid valve block SV4a SV4b SV4d ST17 CV7a 63H1 63HS1 SV1a CV3a CV2a CV5a 63LS SV5b CV8a CV9a CV10a COMP CV6a...
  • Page 119 [ VI Refrigerant Circuit ] (3) PURY-P144 model 21S4a Solenoid valve block SV4a SV4b SV4d ST17 CV7a 63H1 63HS1 SV1a CV3a CV2a CV5a 63LS SV5b CV8a CV9a CV10a COMP CV6a CV4a SV5c Low-pressure side distrbutor 21S4a Solenoid valve block SV4a SV4b SV4d High-pressure...
  • Page 120 [ VI Refrigerant Circuit ] (4) PURY-P168 model 21S4a Solenoid valve block SV4a SV4b SV4d ST17 CV7a 63H1 63HS1 SV1a CV3a CV2a CV5a 63LS SV5b CV8a CV9a CV10a COMP CV6a CV4a SV5c 21S4a Solenoid valve block SV4c SV4d SV4a SV4b High-pressure side junction pipe ST17...
  • Page 121 [ VI Refrigerant Circuit ] (5) PURY-P192, P216, P240 models 21S4a Solenoid valve block SV4c SV4d SV4a SV4b ST17 CV7a 63H1 63HS1 SV1a CV3a CV2a CV5a 63LS SV5b CV8a CV9a CV10a COMP CV6a Low-pressure side distrbutor CV4a SV5c 21S4a Solenoid valve block SV4c SV4d SV4a...
  • Page 122 [ VI Refrigerant Circuit ] 2. BC controller (1) CMB-P104 - P1016NU-G Solenoid valve block TH15 Gas/Liquid separator LEV3 TH12 TH11 LEV1 TH16 Check valve block SVM1 HWE0803A - 113 -...
  • Page 123 [ VI Refrigerant Circuit ] (2) CMB-P108, P1013, P1016NU-GA (main) Solenoid valve block TH15 Gas/Liquid LEV3 separator SVM2 TH12 TH11 LEV1 TH16 LEV2 Check valve block SVM1 (3) CMB-P104, P108NU-GB (sub) Solenoid valve block TH12 TH15 LEV3 HIC-C Check valve block HWE0803A - 114 -...
  • Page 124 [ VI Refrigerant Circuit ] (4) CMB-P1016NU-HB (sub) Solenoid valve block TH12 TH15 LEV3 HIC-C Check valve block HWE0803A - 115 -...
  • Page 125: Principal Parts And Functions

    [ VI Refrigerant Circuit ] [2] Principal Parts and Functions 1. Outdoor unit Part Symbols Notes Usage Specifications Check method name (functions) Com- Adjusts the amount of circulating P72 model pressor (Comp1) refrigerant by adjusting the operat- Low-pressure shell scroll ing frequency based on the oper- compressor ating pressure data...
  • Page 126 [ VI Refrigerant Circuit ] Part Symbols Notes Usage Specifications Check method name (functions) Thermis- Controls defrosting during heating Degrees Celsius Resistance (Pipe operation check = 15k temperature) = 3460 0/80 R = 15 3460 1) Detects outdoor air tempera- (Outdoor tem- ture perature)
  • Page 127 [ VI Refrigerant Circuit ] 2. Indoor Unit Part Symbol Notes Usage Specification Check method Name (functions) Linear 1) Adjusts superheat at the DC12V Refer to the section expan- Opening of stepping motor "Continuity Test with a indoor heat exchanger sion valve driving valve 0-(1400) puls- Tester".
  • Page 128 [ VI Refrigerant Circuit ] 3. BC controller (1) G type Symbols Part Part name Usage Specifications Check method (functions) code Pressure 1) Detects high pressure Pressure sensor (High pres- 2) LEV control 0~4.15 MPa [601psi] Vout 0.5~3.5V sure side) 1 2 3 0.071V/0.098 MPa [14psi] Pressure [MPa]...
  • Page 129 [ VI Refrigerant Circuit ] (2) GA type Symbols Part Part name Usage Specifications Check method (functions) code Pressure 1) Detects high pressure Pressure sensor (High pres- 2) LEV control 0~4.15 MPa [601psi] Vout 0.5~3.5V sure side) 1 2 3 0.071V/0.098 MPa [14psi] Pressure [MPa] Con-...
  • Page 130 [ VI Refrigerant Circuit ] (3) GB type Symbols Part Part name Usage Specifications Check method (functions) code Thermistor TH12 LEV control (Superheat) (Bypass = 15k outlet tem- = 3460 0/80 perature) R = 15 3460 TH15 LEV control (Superheat) 0°C[32°F] : 15kohm (Bypass in- 10°C[50°F] :9.7kohm...
  • Page 131 [ VI Refrigerant Circuit ] (4) HB type Symbols Part Part name Usage Specifications Check method (functions) code Thermistor TH12 LEV control (Superheat) (Bypass = 15k outlet tem- = 3460 0/80 perature) R = 15 3460 TH15 LEV control (Superheat) 0°C[32°F] : 15kohm (Bypass in- 10°C[50°F] :9.7kohm...
  • Page 132: Control

    VII Control [1] Functions and Factory Settings of the Dipswitches ............125 [2] Controlling the Outdoor Unit ..................132 [3] Controlling BC Controller ....................145 [4] Operation Flow Chart..................... 146 HWE0803A - 123 -...
  • Page 133 - 124 -...
  • Page 134: Functions And Factory Settings Of The Dipswitches

    [ VII Control ] VII Control [1] Functions and Factory Settings of the Dipswitches 1. Outdoor unit (1) Control board Units that re- quire switch Function according to switch setting Switch setting timing setting Switch Function Note.2 Unit address setting Set to 00 or 51-100 with the dial switch Before power on For self-diagnosis/...
  • Page 135 [ VII Control ] Units that re- quire switch Function according to switch setting Switch setting timing setting Switch Function Note.2 Test run mode: en- SW3-2 disabled SW3-2 enabled Anytime after power on abled/disabled Test run mode: ON/ Sends a test-run After power on and when Stops all ICs signal to all IC...
  • Page 136 Cooling-only/Cooling-main: Outside temperature is high or high pressure is high. Heating-only/Heating-main: Outside temperature is low or low pressure is low. (page 22) (2) INV board 1) PURY-P72, P96, P120YHMU-A, PURY-P72THMU-A Functions are switched with the following connector. Function according to connec-...
  • Page 137 [ VII Control ] 2) PURY-P96, P120THMU-A Function according to switch Switch setting timing setting Switch Function Enabling/disabling the following error Error detec- Error detec- Anytime after power on detection functions; tion enabled tion disable ACCT/DCCT sensor failure (No load op- (5301 Detail No.
  • Page 138 [ VII Control ] 2. Function of the switch (Indoor unit) (1) Dipswitches 1) SW1,3 Function according to switch setting Switch setting timing Switch Function Notes Set to ON (built-in sensor on the remote controller) Room temperature Built-in sensor on Indoor unit inlet on All Fresh (PEFY-VMH-F) model units detection position...
  • Page 139 [ VII Control ] (2) Address switch Actual indoor unit address setting varies in different systems. Refer to the installation manual for the outdoor unit for details on how to make the address setting. Each address is set with a combination of the settings for the 10's digit and 1's digit. (Example) When setting the address to "3", set the 1's digit to 3, and the 10's digit to 0.
  • Page 140 [ VII Control ] (2) ME remote controller (PAR-F27MEA) Set the address of the remote controller with the rotary switch. Rotary switch 10's digit 1's digit (left) (right) Remote controller unit Example: In case of address 108 Address setting range Setting method Main remote controller 101-150...
  • Page 141: Controlling The Outdoor Unit

    [ VII Control ] [2] Controlling the Outdoor Unit -1- Outline of Control Method The outdoor units are designated as OC and OS in the order of capacity from large to small (if two or more units have the same capacity, in the order of address from small to large). The setting of outdoor unit can be verified by using the self-diagnosis switch (SW1).
  • Page 142 [ VII Control ] -5- Bypass Control Bypass solenoid valves (SV1a), which bypass the high- and low- pressure sides, perform the following functions. (1) Bypass solenoid valve (SV1a) (ON = Open) SV1a Operation When each indoor unit compressor startup ON for 4 minutes. After the restoration of thermo or 3 minutes ON for 4 minutes.
  • Page 143 [ VII Control ] (5) Bypass solenoid valve (SV5b) (ON = Open) SV5c Operation While the unit is stopped Always ON Cooling mode When one or more of the following When the condition on the left is not valves is turned OFF: SV4a through SV4c.
  • Page 144 [ VII Control ] -7- Defrost Operation Control (1) Starting the defrost operation The defrost cycle starts when the pipe temperature (TH6), in the following table, or below has continuously been detected for 3 minutes after the integrated compressor operation time of 50 minutes have passed. If 10 minutes have passed since compressor start-up or since the completion of defrost operation, forced defrost operation will start by turning on the forced defrost switch (DIP SW2-7).
  • Page 145 [ VII Control ] (3) Stopping the defrost operation The defrost cycle ends when 12 minutes have passed since the beginning of the cycle, or when the pipe temperature (TH3 and TH6) has been continuously detected for 2 minutes that exceeds the values in the table below Defrost operation will not stop its operation for 4 minutes once started.
  • Page 146 [ VII Control ] (3) Outdoor unit heat exchanger capacity control patterns Solenoid valve Operation Operation Model mode patterns SV4a SV4b SV4c SV4d SV5c P72 model Cooling- only Cooling- main Heating- only Heating- main Defrost P96, P120 models Cooling- only Cooling- main Heating-...
  • Page 147 [ VII Control ] -10- Control at Initial Start-up When started up for the first time before 12 hours have elapsed after power on, the unit goes into the initial startup mode. At the completion of the initial operation mode on the OC and OS, they will go into the normal control mode. 1.
  • Page 148 [ VII Control ] -11- Emergency Operation Mode 1. Problems with the outdoor unit The P144 through P240 models of unit have a mode that allows the outdoor unit to perform an emergency operation when the other outdoor unit in the system malfunctions. This mode can be started by performing an error reset via the remote controller.
  • Page 149 [ VII Control ] 2. Communication circuit failure or when some of the outdoor units are turned off This is a temporary operation mode in which the outdoor unit that is not in trouble operates when communication circuit failure occurs or when some of the outdoor units are turned off. (1) Starting the emergency operation (When the OC is in trouble) 1) When an error occurs, the error source and the error code appear on the display on the remote controller.
  • Page 150 [ VII Control ] -12- Control Method The control system configuration for the PURY models is shown in the chart below. Daisy-chained Non-polar 2-wire Data signal exchange non-polar 2-wire serial communication between system equipment method transmission line 16-bit CPU Calculation, processing microcomputer operation processing System control...
  • Page 151 [ VII Control ] -13- Cooling/heating Circuit Control and General Function of System Equipment Operation Schematic diagram of refrigerant circuit Schematic diagram of refrigerating cycle Two-phase status Liquid 4-way valve Check valve Selector valve Low- Pressure pressure Low-pressure two-phase pipe Low-pressure Liquid Cooling...
  • Page 152 [ VII Control ] -14- Operation Mode (1) Indoor unit operation mode The operation mode can be selected from the following 6 modes using the remote controller. Cooling mode Heating mode Dry mode Automatic cooling/heating mode Fan mode Stopping mode (2) Outdoor unit operation mode Cooling only mode All indoor units in operation are in cooling mode.
  • Page 153 [ VII Control ] -15- DEMAND Control Cooling/heating operation can be prohibited (Thermo-OFF) by an external input to the indoor units. When DIP SW4-4 is set to ON, the 4-step DEMAND control is enabled. Eight-step demand control is possible in the system with two outdoor units. Refer to Chapter II [3] 2.
  • Page 154: Controlling Bc Controller

    [ VII Control ] [3] Controlling BC Controller 1. Control of SV A, SV B, and SV A, SV B, and SV C turn on or off depending on the operation mode of the branch. Mode Cooling Heating Stopped Defrost SV A Port SV B...
  • Page 155: Operation Flow Chart

    [ VII Control ] [4] Operation Flow Chart 1. Mode determination flowchart (1) Indoor unit (cooling, heating, dry, fan mode) Start Normal operation Error Breaker Stop turned on Operation SW turned on *Note 1 1. Protection function self-holding cancelled. 2. Indoor unit LEV fully closed. *Note 2 Remote controller Error mode...
  • Page 156 [ VII Control ] (2) Outdoor unit (cooling only, heating only, cooling main and heating main modes) Start Normal operation Error Breaker turned on Unit in the stopped state "HO" / "PLEASE WAIT" blinks *Note 1 on the remote controller Indoor units registered to the remote controller...
  • Page 157 [ VII Control ] (3) BC controller (cooling only, heating only, cooling main and heating main modes) Start Normal operation Error Breaker turned on Unit in the stopped state Operation command 1. Determination of operation mode Protection function (Cooling only, Heating only, Mixture self-holding cancelled.
  • Page 158 [ VII Control ] 2. Operations in each mode (1) Cooling operation Cooling operation Normal operation During test run mode 4-way valve OFF Unit in the stopped state Indoor unit fan *Note 1 operation Test run mode Thermostat 3-minute restart prevention 1.
  • Page 159 [ VII Control ] (2) Heating operation Normal operation Heating operation Defrost operation *Note 1,2 Unit in the stopped state Defrost operation During test run mode 4-way valve ON 4-way valve OFF Test run mode 1. Indoor unit fan stop 2.
  • Page 160 [ VII Control ] (3) Dry operation Dry operation Normal operation Thermostat ON 4-way valve OFF Unit in the stopped state Test run mode *Note 2 Thermostat ON Suction temperature 18 C[64 F] *Note 1 1. Indoor unit fan stop 1.
  • Page 161 - 152 -...
  • Page 162: Test Run Mode

    VIII Test Run Mode [1] Items to be checked before a Test Run ................. 155 [2] Test Run Method ......................156 [3] Operating Characteristic and Refrigerant Amount ............157 [4] Adjusting the Refrigerant Amount .................. 157 [5] Refrigerant Amount Adjust Mode................... 160 [6] The following symptoms are normal.
  • Page 163 - 154 -...
  • Page 164: Items To Be Checked Before A Test Run

    [ VIII Test Run Mode ] VIII Test Run Mode [1] Items to be checked before a Test Run (1) Check for refrigerant leak and loose cables and connectors. (2) Measure the insulation resistance between the power supply terminal block and the ground with a 500V megger and make sure it reads at least 1.0Mohm.
  • Page 165: Test Run Method

    [ VIII Test Run Mode ] [2] Test Run Method The figure shows an MA remote controller (PAR-21MAA). ON/OFF button Set Temperature buttons Down Fan Speed button TIME SUN MON TUE WED THU FRI SAT TIMER AFTER AFTER ERROR CODE FUNCTION FILTER WEEKLY...
  • Page 166: Operating Characteristic And Refrigerant Amount

    [ VIII Test Run Mode ] [3] Operating Characteristic and Refrigerant Amount It is important to have a clear understanding of the characteristics of refrigerant and the operating characteristics of air conditioners before attempting to adjust the refrigerant amount in a given system. 1.
  • Page 167 [ VIII Test Run Mode ] 3. Amount of refrigerant to be added The amount of refrigerant that is shown in the table below is factory-charged to the outdoor units. The amount necessary for extended pipe (field piping) is not included and must be added on site. Outdoor unit model P120 Amount of pre-charged refrigerant...
  • Page 168 [ VIII Test Run Mode ] (2) Example Outdoor unit 1 Outdoor unit 2 Branch joint kit Indoor Branch joint (CMY-Y202-G2) (CMY-Y102L-G2) BC controller(HB) (CMY-Y102S-G2) BC controller(HA) H H′ Branch joint Reducer (P06 - P18 models) BC controller(HB) (CMY-Y102S-G2) (Supplied with the BC Controller) Junction pipe kit (CMY-R160-J) (Optional accessory)
  • Page 169: Refrigerant Amount Adjust Mode

    [ VIII Test Run Mode ] [5] Refrigerant Amount Adjust Mode 1. Procedures Follow the procedures below to add or extract refrigerant as necessary depending on the operation mode. When the function switch (SW4-3) on the main board on the outdoor unit (OC only) is turned to ON, the unit goes into the refrigerant amount adjust mode, and the following sequence is followed.
  • Page 170 [ VIII Test Run Mode ] Start Turn on SW4-3 on the OC. Put all indoor units in the test run mode *Refer to the previous page for *Notes 1-4 in the chart. and run the units in cooling mode. Has the initial start-up mode been completed? Has it been at least...
  • Page 171: The Following Symptoms Are Normal

    [ VIII Test Run Mode ] [6] The following symptoms are normal. Remote controller Symptoms Cause display The indoor unit does not start "Cooling (heating)" The unit cannot perform a heating (cooling) operation when other indoor after starting cooling (heating) icon blinks on the units are performing a cooling (heating) operation.
  • Page 172: Standard Operation Data (reference Data)

    [ VIII Test Run Mode ] [7] Standard Operation Data (Reference Data) 1. Single unit (1) Cooling only operation Outdoor unit model Operation PURY-P72THMU-A PURY-P96THMU-A Model name of BC controller CMB-P104NU-G CMB-P104NU-G 26.7°C/19.4°C 26.7°C/19.4°C Indoor Ambient [80 °F/67 °F] [80 °F/67 °F] tempera- DB/WB 35°C/-...
  • Page 173 [ VIII Test Run Mode ] Outdoor unit model Operation PURY-P120THMU-A Model name of BC controller CMB-P104NU-G 26.7°C/19.4°C Indoor Ambient [80°F/67°F] tempera- DB/WB 35°C/- ture Outdoor [95°F/-] No. of connected units Unit Indoor unit No. of units in operation Operating Model 30/30/30/30 conditions...
  • Page 174 [ VIII Test Run Mode ] (2) Heating only operation Outdoor unit model Operation PURY-P72THMU-A PURY-P96THMU-A Model name of BC controller CMB-P104NU-G CMB-P104NU-G 21.1°C/- 21.1°C/- Indoor Ambient [70°F/-] [70°F/-] tempera- DB/WB 8.3°C/6.1°C 8.3°C/6.1°C ture Outdoor [47°F/43°F] [47°F/43°F] No. of connected units Unit Indoor unit No.
  • Page 175 [ VIII Test Run Mode ] Outdoor unit model Operation PURY-P120THMU-A Model name of BC controller CMB-P104NU-G 21.1°C/- Indoor Ambient [70°F/-] tempera- DB/WB 8.3°C/6.1°C ture Outdoor [47°F/43°F] No. of connected units Unit Indoor unit No. of units in operation Operating Model 30/30/30/30 conditions...
  • Page 176 [ VIII Test Run Mode ] 2. 2-unit combination (1) Cooling only operation Outdoor unit model Operation PURY-P144TSHMU-A PURY-P72THMU-A PURY-P72THMU-A Model name of BC controller CMB-P108NU-GA Ambient Indoor 26.7°C/19.4°C [80°F/67°F] tempera- DB/WB Outdoor 35°C/- [95°F/-] ture No. of connected units Unit Indoor unit No.
  • Page 177 [ VIII Test Run Mode ] Outdoor unit model Operation PURY-P168TSHMU-A PURY-P96THMU-A PURY-P72THMU-A Model name of BC controller CMB-P108NU-GA Ambient Indoor 26.7°C/19.4°C [80°F/67°F] tempera- DB/WB Outdoor 35°C/- [95°F/-] ture No. of connected units Unit Indoor unit No. of units in operation Model 30/30/36/36/36 Operating...
  • Page 178 [ VIII Test Run Mode ] Outdoor unit model Operation PURY-P192TSHMU-A PURY-P96THMU-A PURY-P96THMU-A Model name of BC controller CMB-P108NU-GA Ambient Indoor 26.7°C/19.4°C [80°F/67°F] tempera- DB/WB Outdoor 35°C/- [95°F/-] ture No. of connected units Unit Indoor unit No. of units in operation Model 30/30/30/30/36/36 Operating...
  • Page 179 [ VIII Test Run Mode ] Outdoor unit model Operation PURY-P216TSHMU-A PURY-P120THMU-A PURY-P96THMU-A Model name of BC controller CMB-P1013NU-GA Ambient Indoor 26.7°C/19.4°C [80°F/67°F] tempera- DB/WB Outdoor 35°C/- [95°F/-] ture No. of connected units Unit Indoor unit No. of units in operation Model 36/36/36/36/36/36 Operating...
  • Page 180 [ VIII Test Run Mode ] Outdoor unit model Operation PURY-P240TSHMU-A PURY-P120THMU-A PURY-P120THMU-A Model name of BC controller CMB-P1013NU-GA Ambient Indoor 26.7°C/19.4°C [80°F/67°F] tempera- DB/WB Outdoor 35°C/- [95°F/-] ture No. of connected units Unit Indoor unit No. of units in operation Model 24/36/36/36/36/36/36 Operating...
  • Page 181 [ VIII Test Run Mode ] (2) Heating only operation Outdoor unit model Operation PURY-P144TSHMU-A PURY-P72THMU-A PURY-P72THMU-A Model name of BC controller CMB-P108NU-A Ambient Indoor 21.1°C/- [70°F/-] tempera- DB/WB Outdoor 8.3°C/6.1°C [47°F/43°F] ture No. of connected units Unit Indoor unit No.
  • Page 182 [ VIII Test Run Mode ] Outdoor unit model Operation PURY-P168TSHMU-A PURY-P96THMU-A PURY-P72THMU-A Model name of BC controller CMB-P108NU-GA Ambient Indoor 21.1°C/- [70°F/-] tempera- DB/WB Outdoor 8.3°C/6.1°C [47°F/43°F] ture No. of connected units Unit Indoor unit No. of units in operation Model 30/30/36/36/36 Operating...
  • Page 183 [ VIII Test Run Mode ] Outdoor unit model Operation PURY-P192TSHMU-A PURY-P96THMU-A PURY-P96THMU-A Model name of BC controller CMB-P108NU-GA Ambient Indoor 21.1°C/- [70°F/-] tempera- DB/WB Outdoor 8.3°C/6.1°C [47°F/43°F] ture No. of connected units Unit Indoor unit No. of units in operation Model 30/30/30/30/36/36 Operating...
  • Page 184 [ VIII Test Run Mode ] Outdoor unit model Operation PURY-P216TSHMU-A PURY-P120THMU-A PURY-P96THMU-A Model name of BC controller CMB-P1013NU-GA Ambient Indoor 21.1°C/- [70°F/-] tempera- DB/WB Outdoor 8.3°C/6.1°C [47°F/43°F] ture No. of connected units Unit Indoor unit No. of units in operation Model 36/36/36/36/36/36 Operating...
  • Page 185 [ VIII Test Run Mode ] Outdoor unit model Operation PURY-P240TSHMU-A PURY-P120THMU-A PURY-P120THMU-A Model name of BC controller CMB-P1013NU-GA Ambient Indoor 21.1°C/- [70°F/-] tempera- DB/WB Outdoor 8.3°C/6.1°C [47°F/43°F] ture No. of connected units Unit Indoor unit No. of units in operation Model 24/36/36/36/36/36/36 Operating...
  • Page 186 IX Troubleshooting [1] Error Code Lists ......................179 [2] Responding to Error Display on the Remote Controller..........182 [3] Investigation of Transmission Wave Shape/Noise............270 [4] Troubleshooting Principal Parts ..................273 [5] Refrigerant Leak ......................314 [6] Compressor Replacement Instructions................316 [7] Servicing the BC controller ....................
  • Page 187 - 178 -...
  • Page 188: Error Code Lists

    [ IX Troubleshooting ] IX Troubleshooting [1] Error Code Lists Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code 4300 0403 Serial communication error 4305 (Note) 1102 1202 Discharge temperature fault 1301 Low pressure fault 1302 1402...
  • Page 189 [ IX Troubleshooting ] Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code Indoor unit pipe tempera- ture (TH22) Temperature sensor 5102 1217 fault OA processing unit pipe temperature (TH2) Indoor unit gas-side pipe temperature (TH23) OA processing unit gas- Temperature sensor...
  • Page 190 [ IX Troubleshooting ] Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code Remote controller board fault (nonvolatile memory 6201 error) 6202 Remote controller board fault (clock IC error) 6600 Address overlaps 6601 Polarity setting error 6602...
  • Page 191: Responding To Error Display On The Remote Controller

    [ IX Troubleshooting ] [2] Responding to Error Display on the Remote Controller 1. Error Code 0403 (THMU-A) Serial communication error 2. Error definition and error detection method Serial communication error between the control board and the INV board on the compressor, and between the control board and the Fan board Detail code 01: Between the control board and the INV board Detail code 05: Between the control board and the Fan board...
  • Page 192 [ IX Troubleshooting ] 1. Error Code 0403 (YHMU-A) Serial communication error 2. Error definition and error detection method Serial communication error between the control board and the INV board on the compressor, and between the control board and the Fan board Detail code 01: Between the control board and the INV board Detail code 05: Between the control board and the Fan board 3.
  • Page 193 [ IX Troubleshooting ] 1. Error Code 1102 Discharge temperature fault 2. Error definition and error detection method 1) If the discharge temperature of 120 °C [248°F] or more is detected during the above operation (the first detection), the outdoor unit stops once, turns to anti-restart mode for 3 minutes, and restarts after 3 minutes automatically.
  • Page 194 [ IX Troubleshooting ] 1. Error Code 1301 Low pressure fault 2. Error definition and error detection method When starting the compressor from Stop Mode for the first time if low pressure reads 0.098MPa [14psi] immediately before start-up, the operation immediately stops. 3.
  • Page 195 [ IX Troubleshooting ] 1. Error Code 1302 High pressure fault 1 (Outdoor unit) 2. Error definition and error detection method 1) If the pressure of 3.78MPa [548psi] or higher is detected by the pressure sensor during operation (the first detection), the out- door stops once, turns to antirestart mode for 3 minutes, and restarts after 3 minutes automatically.
  • Page 196 [ IX Troubleshooting ] 1. Error Code 1302 High pressure fault 2 (Outdoor unit) 2. Error definition and error detection method If the pressure of 0.098MPa [14psi] or lower is registered on the pressure sensor immediately before start-up, it will trigger an abnormal stop, and error code "1302"...
  • Page 197 [ IX Troubleshooting ] 1. Error Code 2500 Drain sensor submergence (Models with a drain sensor) 2. Error definition and error detection method 1) If an immersion of the drain sensor in the water is detected while the unit is in any mode other than the Cool/Dry mode and when the drain pump goes from OFF to ON, this condition is considered preliminary water leakage.
  • Page 198 [ IX Troubleshooting ] 1. Error Code 2500 Drain sensor submergence (Models with a float switch) 2. Error definition and error detection method 1) If an immersion of the float switch in the water is detected while the unit is in any mode other than the Cool/Dry mode and when the drain pump goes from OFF to ON, this condition is considered preliminary water leakage.
  • Page 199 [ IX Troubleshooting ] 1. Error Code 2502 Drain pump fault (Models with a drain sensor) 2. Error definition and error detection method 1) Make the drain sensor thermistor self-heat. If the temperature rise is small, it is interpreted that the sensor is immersed in water.
  • Page 200 [ IX Troubleshooting ] 1. Error Code 2502 Drain pump fault (Models with a float switch) 2. Error definition and error detection method 1) The immersion of sensor tip in water is detected by the ON/OFF signal from the float switch. Submergence of the sensor When it is detected that the float switch has been ON for 15 seconds, it is interpreted that the sensor tip is immersed in water.
  • Page 201 [ IX Troubleshooting ] 1. Error Code 2503 Drain sensor (Thd) fault 2. Error definition and error detection method If the open or short circuit of the thermistor has been detected for 30 seconds, this condition is considered to be a preliminary error, and the unit goes into the 3-minute restart delay mode.
  • Page 202 [ IX Troubleshooting ] 1. Error Code 2600 Water leakage 2. Cause, check method and remedy Check that water does not leak from the pipes in such as the humidifier. 1. Error Code 2601 Water supply cutoff 2. Cause, check method and remedy Cause Check method and remedy The water tank of the humidifier is empty.
  • Page 203 [ IX Troubleshooting ] 1. Error Code 3121 Out-of-range outside air temperature 2. Error definition and error detection method When the thermistor temperature of -28°C[-18°F] or below has continuously been detected for 3 minutes during heating op- eration (during compressor operation), the unit makes an error stop and "3121" appears on the display. (Use the OC therm- istor temperature to determine when two outdoor units are in operation.) The compressor restarts when the thermistor temperature is -26°C[-15°F] or above (both OC and OS) during error stop.
  • Page 204 [ IX Troubleshooting ] 1. Error Code 4102 (THMU-A) Open phase 2. Error definition and error detection method An open phase of the power supply (L1 phase, L2 phase) was detected at power on. The L3 phase current is outside of the specified range. The open phase of the power supply may not always be detected if a power voltage from another circuit is applied.
  • Page 205 [ IX Troubleshooting ] 1. Error Code 4102 (YHMU-A) Open phase 2. Error definition and error detection method An open phase of the power supply (L1 phase, L2 phase) was detected at power on. The L3 phase current is outside of the specified range. The open phase of the power supply may not always be detected if a power voltage from another circuit is applied.
  • Page 206 [ IX Troubleshooting ] 1. Error Code 4106 <Transmission power supply fault error detail FF (Outdoor unit)> 2. Error definition and error detection method Transmission power output failure 3. Cause 1) Wiring failure 2) Transmission power supply cannot output voltage because overcurrent was detected. 3) Voltage cannot be output due to transmission power supply problem.
  • Page 207 [ IX Troubleshooting ] 1. Error Code (THMU-A) 4115 Power supply signal sync error 2. Error definition and error detection method The frequency cannot be determined when the power is switched on. 3. Cause, check method and remedy Cause Check method and remedy Power supply error Check the voltage of the power supply terminal block (TB1).
  • Page 208 [ IX Troubleshooting ] 1. Error Code 4116 RPM error/Motor error 2. Error definition and error detection method LOSSNAY The motor keep running even if the power is OFF. The thermal overload relay is ON. (Only for the three-phase model) Indoor unit If detected less than 180rpm or more than 2000rpm, the indoor unit will restart and keep running for 3 minutes.If detected again, the display will appear.
  • Page 209 [ IX Troubleshooting ] 1. Error Code 4220 (THMU-A) 4225 Abnormal bus voltage drop (Detail code 108) 2. Error definition and error detection method If Vdc 160V or less is detected during Inverter operation. (S/W detection) 3. Cause, check method and remedy (1) Power supply environment Check whether the unit makes an instantaneousstop when the detection result is abnormal or a power failure occurs.
  • Page 210 [ IX Troubleshooting ] 1. Error Code 4220 (YHMU-A) 4225 Abnormal bus voltage drop (Detail code 108) 2. Error definition and error detection method If Vdc 289V or less is detected during Inverter operation. (S/W detection) 3. Cause, check method and remedy (1) Power supply environment Check whether the unit makes an instantaneous stop when the detection result is abnormal or a power failure occurs.
  • Page 211 [ IX Troubleshooting ] 1. Error Code 4220 (THMU-A) 4225 Abnormal bus voltage rise (Detail code 109) 2. Error definition and error detection method If Vdc 400V is detected during inverter operation. 3. Cause, check method and remedy (1) Different voltage connection Check the power supply voltage on the power supply terminal block (TB1).
  • Page 212 [ IX Troubleshooting ] 1. Error Code 4220 (THMU-A) (P96 and P120 models) 4225 VDC error (Detail code 110) 2. Error definition and error detection method Bus voltage abnormality If Vdc 400V or Vdc 160V is detected. (H/W detection) 3. Cause, check method and remedy Same as detail code No.108 and 109 of 4220 error Refer to section -7- "Inverter (THMU-A)"...
  • Page 213 [ IX Troubleshooting ] 1. Error Code 4220 (THMU-A) 4225 Logic error (Detail code 111) 2. Error definition and error detection method H/W error If only the H/W error logic circuit operates, and no identifiable error is detected. 3. Cause, Check method and remedy In the case of 4220 Cause Check method and remedy...
  • Page 214 [ IX Troubleshooting ] 1. Error Code 4220 (YHMU-A) 4225 Logic error (Detail code 111) 2. Error definition and error detection method H/W error If only the H/W error logic circuit operates, and no identifiable error is detected. 3. Cause, Check method and remedy In the case of 4220 Cause Check method and remedy...
  • Page 215 [ IX Troubleshooting ] 1. Error Code 4230 (THMU-A) Heatsink overheat protection 2. Error definition and error detection method When the heat sink temperature (THHS) remains at or above TOH is detected. Model P72 model 100°C [212°F] P96, P120 models 90°C [194°F] 3.
  • Page 216 [ IX Troubleshooting ] 1. Error Code 4230 (YHMU-A) Heatsink overheat protection 2. Error definition and error detection method When the heat sink temperature (THHS) remains at or above 100°C [212°F] is detected. 3. Cause, check method and remedy Cause Check method and remedy Fan board failure Refer to IX [4] -7- (2) [6].(page 304)
  • Page 217 [ IX Troubleshooting ] 1. Error Code 4240 (THMU-A) Overload protection 2. Error definition and error detection method If the output current of "(Iac) >Imax (Arms)" or "THHS > TOL" is continuously detected for 10 minutes or more during inverter operation.
  • Page 218 [ IX Troubleshooting ] 1. Error Code 4240 (YHMU-A) Overload protection 2. Error definition and error detection method If the output current of "(Iac) >Imax (Arms)" or "THHS > 95°C [203°F] " is continuously detected for 10 minutes or more during inverter operation.
  • Page 219 [ IX Troubleshooting ] 1. Error Code 4250 (THMU-A) 4255 IPM error (Detail code 101) 2. Error definition and error detection method In the case of 4250 P72 model Overcurrent is detected by the overcurrent detection resistor (RSH) on the INVboard. P96 and P120 models IPM error signal is detected.
  • Page 220 [ IX Troubleshooting ] 1. Error Code 4250 (YHMU-A) 4255 IPM error (Detail code 101) 2. Error definition and error detection method In the case of 4250 Overcurrent is detected by the overcurrent detection resistor (RSH) on the INV board. In the case of 4255 IPM error signal is detected.
  • Page 221 [ IX Troubleshooting ] 1. Error Code 4250 (THMU-A) ACCT overcurrent (H/W detection) (Detail code 102) DCCT overcurrent (H/W detection) (Detail code 103) Instantaneous overcurrent (Detail code 106) Overcurrent (Detail code 107) 2. Error definition and error detection method P72 model Overcurrent 88 Apeak or 42 Arms and above is detected by the current sensor.
  • Page 222 [ IX Troubleshooting ] 1. Error Code 4250 (YHMU-A) Instantaneous overcurrent (Detail code 106) Overcurrent (Detail code 107) 2. Error definition and error detection method P72 model Overcurrent 94 Apeak or 22 Arms and above is detected by the current sensor. P96 andP120 models Overcurrent 94 Apeak or 35 Arms and above is detected by the current sensor.
  • Page 223 [ IX Troubleshooting ] 1. Error Code 4250 4255 Overcurrent error due to short-circuited motor (Detail code 105) 2. Error definition and error detection method When a short is detected on the load side just before starting the inverter operation. 3.
  • Page 224 [ IX Troubleshooting ] 1. Error Code 4260 (YHMU-A) Heatsink overheat protection at startup 2. Error definition and error detection method The heatsink temperature (THHS) remains at or above 100°C [212°F] for 10 minutes or more at inverter startup. 3. Cause, check method and remedy Same as 4230 error HWE0803A - 215 -...
  • Page 225 [ IX Troubleshooting ] 1. Error Code 5101 Return air temperature sensor (TH21) fault (Indoor unit) Return air temperature sensor (TH4) fault (OA processing unit) 5102 Pipe temperature sensor (TH22) fault (Indoor unit) Pipe temperature sensor (TH2) fault (OA processing unit) 5103 Gas-side pipe temperature sensor (TH23) fault (Indoor unit) Gas-side pipe temperature sensor (TH3) fault (OA processing unit)
  • Page 226 [ IX Troubleshooting ] 1. Error Code 5103 Heat exchanger outlet temperature sensor (TH3) fault (Outdoor unit) 5104 Discharge temperature sensor (TH4) fault (Outdoor unit) 5105 Accumulator inlet temperature sensor (TH5) fault (Outdoor unit) 5106 Heat exchanger inlet temperature sensor (TH6) fault (Outdoor unit) 5107 Outside temperature sensor (TH7) fault (Outdoor unit) 2.
  • Page 227 [ IX Troubleshooting ] 1. Error Code 5110 (THMU-A) Heatsink temperature sensor (THHS) fault (Detail code 01) 2. Error definition and error detection method When a short or an open of THHS is detected just before or during the inverter operation. 3.
  • Page 228 [ IX Troubleshooting ] 1. Error Code 5111 Liquid inlet temperature sensor (TH11) fault (BC controller) 5112 Bypass outlet temperature sensor (TH12) fault (BC controller) 5115 LEV3 outlet temperature sensor (TH15) fault (BC controller) 5116 LEV3 inlet temperature sensor (TH16) fault (BC controller) 2.
  • Page 229 [ IX Troubleshooting ] 1. Error Code 5201 High-pressure sensor fault (63HS1) 2. Error definition and error detection method If the high pressure sensor detects 0.098MPa [14psi] or less during the operation, the outdoor unit stops once, turns to anti- restart mode for 3 minutes, and restarts after 3 minutes when the detected high pressure sensor is 0.098MPa [14psi] or more.
  • Page 230 [ IX Troubleshooting ] 1. Error Code 5201 High-pressure sensor fault (Outdoor unit HPS/BC controller PS1) 5203 Intermediate pressure sensor fault (BC controller PS3) 2. Error definition and error detection method When a pressure sensor reading of 4.06 MPa [589 psi] or above is detected, error codes "5201" and "5203" will appear. The unit will continue its operation by using other sensors as a backup.
  • Page 231 [ IX Troubleshooting ] 1. Error Code 5301 (THMU-A) ACCT sensor fault (Detail code 115) 2. Error definition and error detection method When the formula "output current < 2 Arms" remains satisfied for 10 seconds while the inverter is in operation. 3.
  • Page 232 [ IX Troubleshooting ] 1. Error Code 5301 (THMU-A) (P96 and P120 models only) DCCT sensor fault (Detail code116) 2. Error definition and error detection method When the bus current less than 18 Apeak is detected at startup (6Hz) 3. Cause, check method and remedy Cause Check method and remedy Contact failure...
  • Page 233 [ IX Troubleshooting ] 1. Error Code 5301 ACCT sensor circuit fault (Detail code 117) 2. Error definition and error detection method When an error value is detected with the ACCT detection circuit just before the inverter starts 3. Cause, check method and remedy Cause Check method and remedy INV board failure...
  • Page 234 [ IX Troubleshooting ] 1. Error Code 5301 (THMU-A) (P96 and P120 model only) DCCT sensor circuit fault (Detail code118) 2. Error definition and error detection method When an error value is detected with the DCCT detection circuit just before the inverter starts 3.
  • Page 235 [ IX Troubleshooting ] 1. Error Code 5301 (THMU-A) Open-circuited IPM/Loose ACCT connector (Detail code 119) 2. Error definition and error detection method Presence of enough current cannot be detected during the self-diagnostic operation immediately before inverter startup. 3. Cause, check method and remedy P72 model Cause Check method and remedy...
  • Page 236 [ IX Troubleshooting ] 1. Error Code 5301 (YHMU-A) Open-circuited IPM/Loose ACCT connector (Detail code 119) 2. Error definition and error detection method Presence of enough current cannot be detected during the self-diagnostic operation immediately before inverter startup. 3. Cause, check method and remedy Cause Check method and remedy Inverter output wiring problem...
  • Page 237 [ IX Troubleshooting ] 1. Error Code 5301 (YHMU-A) Faulty ACCT wiring (Detail code 120) 2. Error definition and error detection method Presence of target current cannot be detected during the self-diagnostic operation immediately before startup. 3. Cause, check method and remedy Cause Check method and remedy Inverter output wiring problem...
  • Page 238 [ IX Troubleshooting ] 1. Error Code 5401 Temperature sensor fault 2. Error definition and error detection method A short-circuit or an open-circuit of the humidity sensor is detected during operation. 3. Cause, check method and remedy Cause Check method and remedy Connector contact failure (CN30) (Loose con- Check the connector for proper contact.
  • Page 239 [ IX Troubleshooting ] 1. Error Code 5701 Loose float switch connector 2. Error definition and error detection method Detection of the disconnected float switch (open-phase condition) during operation 3. Cause, check method and remedy (1) CN4F disconnection or contact failure Check for disconnection of the connector (CN4F) on the indoor unit control board.
  • Page 240 [ IX Troubleshooting ] 1. Error Code 6600 Address overlaps 2. Error definition and error detection method An error in which signals from more than one indoor units with the same address are received The address and attribute that appear on the remote controller indicate the controller that detected the error. 3.
  • Page 241 [ IX Troubleshooting ] 1. Error Code 6602 Transmission processor hardware error 2. Error definition and error detection method Although "0" was surely transmitted by the transmission processor, "1" is displayed on the transmission line. The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
  • Page 242 [ IX Troubleshooting ] 1. Error Code 6603 Transmission line bus busy error 2. Error definition and error detection method Generated error when the command cannot be transmitted for 4-10 minutes in a row due to bus-busy Generated error when the command cannot be transmitted to the transmission line for 4-10 minutes in a row due to noise The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
  • Page 243 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 244 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 245 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 246 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 247 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 248 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 249 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 250 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 251 [ IX Troubleshooting ] 1. Error Code 6607 No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 252 [ IX Troubleshooting ] 1. Error Code 6608 No response error 2. Error definition and error detection method When no response command is returned although acknowledgement (ACK) is received after transmission, an error is detect- When the data is transmitted 10 times in a row with 3 seconds interval, an error is detected on the transmission side. The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
  • Page 253 [ IX Troubleshooting ] 1. Error Code 6831 MA controller signal reception error (No signal reception) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. No proper data has been received for 3 minutes. 3.
  • Page 254 [ IX Troubleshooting ] 1. Error Code 6832 MA remote controller signal transmission error (Synchronization error) 2. Error definition and error detection method MA remote controller and the indoor unit is not done properly. Failure to detect opening in the transmission path and unable to send signals Indoor unit : 3 minutes Remote controller : 6 seconds 3.
  • Page 255 [ IX Troubleshooting ] 1. Error Code 6833 MA remote controller signal transmission error (Hardware error) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. An error occurs when the transmitted data and the received data differ for 30 times in a row. 3.
  • Page 256 [ IX Troubleshooting ] 1. Error Code 6834 MA controller signal reception error (Start bit detection error) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. No proper data has been received for 2 minutes. 3.
  • Page 257 [ IX Troubleshooting ] 1. Error Code 7100 Total capacity error 2. Error definition and error detection method The model total of indoor units in the system with one outdoor unit exceeds limitations. 3. Error source, cause, check method and remedy, Error source Cause Check method and remedy...
  • Page 258 [ IX Troubleshooting ] 1. Error Code 7101 Capacity code setting error 2. Error definition and error detection method Connection of incompatible (wrong capacity code) indoor unit or outdoor unit 3. Error source, cause, check method and remedy Error source Cause Check method and remedy Outdoor unit...
  • Page 259 [ IX Troubleshooting ] 1. Error Code 7102 Wrong number of connected units 2. Error definition and error detection method The number of connected indoor units is "0" or exceeds the allowable value. 3. Error source, cause, check method and remedy Error source Cause Check method and remedy...
  • Page 260 [ IX Troubleshooting ] 1. Error Code 7105 Address setting error 2. Error definition and error detection method Erroneous setting of OC unit address Erroneous setting of BC controller address 3. Cause, check method and remedy Error source Cause Check method and remedy Outdoor unit Erroneous setting of OC unit address Check that the outdoor unit and BC controller...
  • Page 261 [ IX Troubleshooting ] 1. Error Code 7107 Port setting error 2. Error definition and error detection method The port with wrong number is connected to the indoor unit.The model total connected to the port is greater than the specifi- cation.
  • Page 262 [ IX Troubleshooting ] 1. Error Code 7110 Connection information signal transmission/reception error 2. Error definition and error detection method The given indoor unit is inoperable because it is not properly connected to the outdoor unit in the same system. 3.
  • Page 263 [ IX Troubleshooting ] 1. Error Code 7113 Function setting error (incorrect resistor connection) 2. Error source, cause, check method and remedy Error source Cause Check method and remedy Outdoor unit Wiring fault (Detail code 15) Loose connectors, short-circuit, con- Check the connector CNTYP5 on the control board for tact failure proper connection.
  • Page 264 [ IX Troubleshooting ] 1. Error Code 7117 Model setting error 2. Error source, cause, check method and remedy Error source Cause Check method and remedy Outdoor unit Wiring fault (Detail code 15) Loose connectors, short-circuit, con- Check the connector CNTYP5 on the control board for tact failure proper connection.
  • Page 265 [ IX Troubleshooting ] 1. Error Code 7130 Incompatible unit combination 2. Error definition and error detection method The check code will appear when the indoor units with different refrigerant systems are connected. 3. Error source, cause, check method and remedy Error source Cause Check method and remedy...
  • Page 266 [ IX Troubleshooting ] -1- Troubleshooting according to the remote controller malfunction or the external input error In the case of MA remote controller 1. Phenomena Even if the operation button on the remote controller is pressed, the display remains unlit and the unit does not start run- ning.(Power indicator does not appear on the screen.) (1) Cause...
  • Page 267 [ IX Troubleshooting ] In the case of MA remote controller 2. Phenomena When the remote controller operation SW is turned on, the operation status briefly appears on the display, then it goes off, and the display lights out immediately, and the unit stops. (1) Cause 1) The power for the M-NET transmission line is not supplied from the outdoor unit.
  • Page 268 [ IX Troubleshooting ] In the case of MA remote controller 3. Phenomena "HO" or "PLEASE WAIT" display on the remote controller does not disappear, and no operation is performed even if the button is pressed. ("HO" or "PLEASE WAIT" display will normally turn off 5 minutes later after the power on.) (1) Cause 1) The power for the M-NET transmission line is not supplied from the outdoor unit.
  • Page 269 [ IX Troubleshooting ] Flow chart Even if the operation button on the remote controller is pressed, the indoor and the outdoor units do not start running. HWE0803A - 260 -...
  • Page 270 [ IX Troubleshooting ] In case of M-NET remote controller 1. Phenomena Even if the operation button on the remote controller is pressed, the display remains unlit and the unit does not start running. (Power indicator does not appear on the screen.) (1) Cause 1) The power for the M-NET transmission line is not supplied from the outdoor unit.
  • Page 271 [ IX Troubleshooting ] In case of M-NET remote controller 2. Phenomena When the remote controller operation SW is turned on, a temporary operation display is indicated, and the display lights out immediately. (1) Cause 1) The power is not supplied to the indoor unit. The main power of the indoor unit (AC208/230V) is not on.
  • Page 272 [ IX Troubleshooting ] In case of M-NET remote controller 3. Phenomena "HO" display on the remote controller does not disappear, and no operation is performed even if the button is pressed. (1) Cause Without using MELANS 1) Outdoor unit address is set to "00" 2) A wrong address is set.
  • Page 273 [ IX Troubleshooting ] In case of M-NET remote controller 4. Phenomena "88" appears on the remote controller when the address is registered or confirmed. (1) Cause, check method and remedy Cause Check method and remedy An error occurs when the address is registered or con- firmed.
  • Page 274 [ IX Troubleshooting ] Both for MA remote controller and M-NET remote controller 1. Phenomena Although cooling operation starts with the normal remote controller display, the capacity is not enough (1) Cause, check method and remedy Cause Check method and remedy Compressor frequency does not rise sufficiently.
  • Page 275 [ IX Troubleshooting ] Cause Check method and remedy Long piping length Check the piping length to determine if it is contrib- The cooling capacity varies greatly depending on the uting to performance loss. pressure loss. (When the pressure loss is large, the Piping pressure loss can be estimated from the cooling capacity drops.) temperature difference between the indoor unit...
  • Page 276 [ IX Troubleshooting ] 2. Phenomena Although heating operation starts with the normal remote controller display, the capacity is not enough. (1) Cause, check method and remedy Cause Check method and remedy Compressor frequency does not rise sufficiently. Check pressure difference between the detected pressure by the pressure sensor and the actual Faulty detection of pressure sensor.
  • Page 277 [ IX Troubleshooting ] Cause Check method and remedy Indoor unit LEV malfunction Refer to the page of LEV troubleshooting ( [4] -5- Insufficient refrigerant flows due to LEV malfunction ).(page 279) (not enough opening). Temperature reading error on the indoor unit piping Check the thermistor.
  • Page 278 [ IX Troubleshooting ] 3. Phenomena Outdoor unit stops at times during operation. (1) Cause, check method and remedy Cause Check method and remedy The first stop is not considered as an error, as the Check the mode operated in the past by displaying unit turns to anti-restart mode for 3 minutes as a pre- preliminary error history on LED display with SW1.
  • Page 279: Investigation Of Transmission Wave Shape/noise

    [ IX Troubleshooting ] [3] Investigation of Transmission Wave Shape/Noise 1. M-NET transmission Control is performed by exchanging signals between the outdoor unit and the indoor unit (M-NET remote controller) through M-NET transmission. Noise interference on the transmission line will interrupt the normal transmission, leading to erroneous operation.
  • Page 280 [ IX Troubleshooting ] (3) Check method and remedy 1) Measures against noise Check the followings when noise exists on the wave or the errors described in (1) occur. Error code definition Remedy Check that the wiring 1. The transmission line and Isolate the transmission line from the power line (5cm [1-31/32"] or work is performed ac- the power line are not...
  • Page 281 [ IX Troubleshooting ] 2. MA remote controller transmission The communication between the MA remote controller and the indoor unit is performed with current tone burst. (1) Symptoms caused by noise interference on the transmission line If noise is generated on the transmission line, and the communication between the MA remote controller and the indoor unit is interrupted for 3 minutes in a row, MA transmission error (6831) will occur.
  • Page 282: Troubleshooting Principal Parts

    [ IX Troubleshooting ] [4] Troubleshooting Principal Parts -1- High-Pressure Sensor (63HS1, PS1, PS3) 1. Compare the pressure that is detected by the high pressure sensor, and the high-pressure gauge pressure to check for failure. By configuring the digital display setting switch (SW1) as shown in the figure below, the pressure as measured by the high- pressure sensor appears on the LED1 on the control board.
  • Page 283 [ IX Troubleshooting ] -2- Low-Pressure Sensor (63LS) 1. Compare the pressure that is detected by the low pressure sensor, and the low pressure gauge pressure to check for failure. By configuring the digital display setting switch (SW1) as shown in the figure below, the pressure as measured by the low- pressure sensor appears on the LED1 on the control board.
  • Page 284 [ IX Troubleshooting ] -3- Solenoid Valve Check whether the output signal from the control board and the operation of the solenoid valve match. Setting the self-diagnosis switch (SW1) as shown in the figure below causes the ON signal of each relay to be output to the LED's. Each LED shows whether the relays for the following parts are ON or OFF.
  • Page 285 [ IX Troubleshooting ] (4) SV4a, 4b and 4d (P72 model), SV4a - 4d (P96 and P120 models)(Controls heat exchanger capacity) 1) Depending on the conditions during Cooling-only operation, at least one of the solenoid valves among SV4a through 4d turns on.
  • Page 286 [ IX Troubleshooting ] Refrigerant Circuit Figure (P96 and P120 models) Solenoid Valves Block SV4c SV4d SV4a SV4b CV7a CV3a CV2a CV5a SV5b CV8a CV9a CV10a CV6a CV4a SV5c Solenoid valve block (four compartments) P96 and P120 models SV4d SV4c SV4b SV4a SV4d...
  • Page 287 [ IX Troubleshooting ] (5) In the case of SV5b (Bypass valve) This solenoid valve closes when energized (when the relay is on). This valve turns off for five minutes after the completion of the defrost cycle, or when SV9 is on turned ON and the value of 63HS1 is greater than 3.5 MPa [507psi] during Heating-only or Heating-main operation at the minimum frequency.
  • Page 288 [ IX Troubleshooting ] -4- Outdoor Unit Fan To check the revolution of the fan, check the inverter output state on the self-diagnosis LED, as the inverter on the outdoor fan controls the revolutions of the fan.The revolution of the fan is approximately 680rpm(P72 model),790rpm(P96 and P120 models) at full speed.
  • Page 289 [ IX Troubleshooting ] *When the power is turned on, the valve closing signal of 2200 pulses will be output from the indoor board to LEV to fix the valve position. It must be fixed at point A. When the valve operates smoothly, no sound from LEV or no vibration occurs, however, when the pulses change from E to A in the chart or the valve is locked, a big sound occurs.
  • Page 290 [ IX Troubleshooting ] (2) Judgment methods and possible failure mode Malfunction Judgment method Remedy mode Microcomputer Disconnect the control board connector and connect When the drive circuit has a driver circuit fail- the check LED as shown in the figure below. problem, replace the control board.
  • Page 291: Pressure Sensor

    [ IX Troubleshooting ] -6- Troubleshooting Principal Parts of BC Controller 1. Pressure sensor Troubleshooting flow chart for pressure sensor START Note 1 Check whether the pressure sensor or the connectors of P1 and P3 are connected, properly Repair the fault. Operating at the moment? Note 2 On the self-diagnosis monitor, measure...
  • Page 292 [ IX Troubleshooting ] 1) BC controller: Phenomena when the pressure sensor is connected wrongly (reverse connection of P1 and P3) to the board. Symptoms Cooling-only Cooling-main Heating only Heating main Non-cooling Indoor heating SC small Normal Non-cooling SC11 large SC11 large SC11 large Indoor heating SC small...
  • Page 293 [ IX Troubleshooting ] 2. Temperature sensor Troubleshooting instructions for thermistor START Note 1 Pull out the thermistor connector in trouble from the board. Note 2 Measure the temperature of the thermistor in trouble. (actual measurement value) Note 3 Check the thermistor resistor. Compare the temperature corresponding to the resistance measured by the thermistor and the temperature measured by a commercially...
  • Page 294 [ IX Troubleshooting ] 1) For the connectors on the board, TH11 and TH12 are connected to CN10, and TH15 and TH16 are connected to CN11. Dis- connect the connector in trouble, and check the sensor of each number. Pull out the sensor connector from the I/O board, Do not pull the sensor by holding the lead wire. Measure the resistance with such as a tester.
  • Page 295 [ IX Troubleshooting ] 3. Troubleshooting flow chart for LEV Solenoid valve (1) LEV No cooling capacity No heating capacity Note 1 Check whether the electric expansion valve and the solenoid valve connector are not disconnected or not loose. Repair the fault. Fault is found.
  • Page 296 [ IX Troubleshooting ] 1) BC controller: Phenomena when LEV is connected wrongly (reverse connection of LEV1 and LEV3) to the board. Phenomena Cooling-only Cooling-main Heating only Heating main Non-cooling Non-cooling and non-heating Indoor heating SC small Non-cooling SH12 small, SC11 small SH12 small, SC11 small PHM large Indoor heating SC small...
  • Page 297 [ IX Troubleshooting ] Self-diagnosis LED Measurement data Symbol SW1 setting value 1 2 3 4 5 6 7 8 9 10 LEV1 opening 1 2 3 4 5 6 7 8 9 10 LEV2 opening 1 2 3 4 5 6 7 8 9 10 G, GA LEV3 opening (Standard...
  • Page 298 [ IX Troubleshooting ] Troubleshooting flow chart for solenoid valve body Start Check for pins not fully inserted on the connector and check the colors of the lead wires visually. Intermediate connector Control board When LEV is fully closed : tick sound When LEV is fully open : no sound Brown Brown...
  • Page 299 [ IX Troubleshooting ] (2) Solenoid valve (SVA, SVB, SVC) Faulty judgment of solenoid valve Stop the operation of the applied BC remote controller system. Stop the operation Check whether the wire to the solenoid valve is not connected wrongly, or the connector is not loose. No fault Repair the fault.
  • Page 300 [ IX Troubleshooting ] Check whether the BC board output signal corresponds with the solenoid valve operation correspond. 1) SVA, SVB, SVC SVA, SVB, and SVC turn on or off according to the indoor unit operation mode. Mode Cooling Heating Stopped Defrost Port...
  • Page 301 [ IX Troubleshooting ] 4. BC controller transformer BC controller control board CNTR CN03 White Normal Abnormal CNTR(1)-(3) about 58 ohm. Open-phase or shorting CN03(1)-(3) about 16 ohm. * Before measuring the resistance, pull out the connector. HWE0803A - 292 -...
  • Page 302 [ IX Troubleshooting ] [THMU-A] -7- Inverter (THMU-A) Replace only the compressor if only the compressor is found to be defective. (Overcurrent will flow through the inverter if the compressor is damaged, however, the power supply is automatically cut when overcurrent is detected, protecting the inverter from damage.) Replace only the fan motor if only the fan motor is found to be defective.
  • Page 303 [ IX Troubleshooting ] [THMU-A] Error display/failure condition Measure/inspection item Inverter related errors Check the details of the inverter error in the error log at 10.[1] Table of 4250, 4255, 4220, 4225, 4230, 4240,4260, 5301, 0403 LED codes. Take appropriate measures to the error code and the error details in ac- cordance with 9.
  • Page 304 [ IX Troubleshooting ] [THMU-A] (2) Inverter output related troubles Items to be checked Phenomena Remedy <P72 model> IPM/overcurrent breaker trip Replace the INV board. Check the INV (4250 Detail code No. 101, 104, board error 105, 106, and 107) detection cir- (1) Disconnect the invert- Logic error...
  • Page 305 [ IX Troubleshooting ] [THMU-A] Items to be checked Phenomena Remedy <P72 model> Inverter-related problems are de- Connect the short-circuit con- Check whether tected. nector to CN6, and go to sec- the inverter is tion [1]. damaged. Disconnect the inverter Inverter voltage is not output.
  • Page 306 [ IX Troubleshooting ] [THMU-A] (3) Trouble treatment when the main power breaker is tripped. Items to be checked Phenomena Remedy Perform Meg check between the Zero to several ohm, or Meg failure Check each part in the main inverter terminals on the power terminal circuit.
  • Page 307 [ IX Troubleshooting ] [THMU-A] (4) Simple checking procedure for individual components of main inverter circuit Before checking, turn the power off and remove the parts to be checked from the control box. Part name Judgment method Diode stack Refer to "Diode stack" ( IX [4] - 7 - (6) ) IPM (Intelligent Refer to "Intelligent power module (IPM)"...
  • Page 308 [ IX Troubleshooting ] [THMU-A] (5) Intelligent power module (P96 and P120 models) Measure resistances between each pair of terminals on the IPM with a tester, and use the results for troubleshooting. 1) Notes on measurement Check the polarity before measuring. (On the tester, black normally indicates plus.) Check that the resistance is not open ( ohm) or not shorted (to 0 ohm).
  • Page 309 [ IX Troubleshooting ] [THMU-A] (6) Diode stack (P96 and P120 models) Measure resistances between each pair of terminals on the diode stack with a tester, and use the results for troubleshoot- ing.Refer to (5) " Intelligent power module (IPM) " for notes on measurement and tester selection. Judgment value (reference) Black ( + ) External view...
  • Page 310 [ IX Troubleshooting ] [YHMU-A] -7- Inverter (YHMU-A) Replace only the compressor if only the compressor is found to be defective. Replace only the fan motor if only the fan motor is found to be defective. Replace the defective components if the inverter is found to be defective. If both the compressor and the inverter are found to be defective, replace the defective component(s) of both devices.
  • Page 311 [ IX Troubleshooting ] [YHMU-A] Error display/failure condition Measure/inspection item Inverter related errors Check the details of the inverter error in the error log at 10.[1] Table of 4250, 4255, 4220, 4225, 4230, 4240,4260, 5301, 0403 LED codes. Take appropriate measures to the error code and the error details in ac- cordance with 9.
  • Page 312 [ IX Troubleshooting ] [YHMU-A] (2) Inverter output related troubles Items to be checked Phenomena Remedy Disconnect the invert- Overcurrent error Replace the INV board. Check the er output wire from (4250 Detail code No. 101, 104, INV board er- the terminals of the 105, 106, and 107) ror detection...
  • Page 313 [ IX Troubleshooting ] [YHMU-A] Items to be checked Phenomena Remedy Disconnect the inverter Inverter-related problems are de- Connect the short-circuit con- Check whether output wire from the ter- tected. nector to CN6, and go to sec- the inverter is minals of the inverter tion [1].
  • Page 314 [ IX Troubleshooting ] [YHMU-A] (3) Trouble treatment when the main power breaker is tripped Items to be checked Phenomena Remedy Check the breaker capacity. Use of a non-specified break- Replace it with a specified breaker. Perform Meg check between the Zero to several ohm, or Meg Check each part and wiring.
  • Page 315 [ IX Troubleshooting ] [YHMU-A] (5) Simple checking procedure for individual components of main inverter circuit Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and confirm that the voltage between FT-P and FT-N on INV Board has dropped to DC20V or less.
  • Page 316 [ IX Troubleshooting ] [YHMU-A] Judgment value (reference) Black ( + ) SC-P1 FT-N SC-L1 SC-L2 SC-L3 SC-P1 5 - 200 ohm 5 - 200 ohm 5 - 200 ohm FT-N Red (-) SC-L1 5 - 200 ohm SC-L2 5 - 200 ohm SC-L3 5 - 200 ohm Black ( + )
  • Page 317 [ IX Troubleshooting ] [THMU-A] -8- Control Circuit (THMU-A) (1) Control power source function block 1) PURY-P72THMU-A Power source system (AC 208 / 230 V) Control system (DC 5 ~ 30 V) Noise filter INV board Compressor Noise filter Rectifier Smoothing capacitor Inverter AC 208 / 230 V...
  • Page 318: Indoor Unit

    [ IX Troubleshooting ] [THMU-A] 2) PURY-P96, P120THMU-A Power source system (AC 208 / 230 V) Control system (DC 5 ~ 30 V) Noise filter Compressor Smoothing capacitor Inverter Noise filter Rectifier AC 208 / 230 V INV board Inverter drive Fuse Terminal block for 15V Power supply...
  • Page 319 [ IX Troubleshooting ] [THMU-A] (2) Troubleshooting transmission power circuit of outdoor unit 1) PURY-P72THMU-A Check the voltage at the indoor/outdoor transmission terminal block (TB3) of outdoor unit. DC 24 ~ 30 V Check whether the transmission line is disconnected, check for contact failure, and repair the problem.
  • Page 320 [ IX Troubleshooting ] [THMU-A] 2) PURY-P96, P120THMU-A Check the voltage at the indoor/outdoor transmission terminal block (TB3) of outdoor unit. Check whether the transmission line is disconnected, DC 24 ~ 30 V check for contact failure, and repair the problem. Check the voltage at TB3 after removing transmission line from TB3.
  • Page 321 [ IX Troubleshooting ] [YHMU-A] - 8 - Control Circuit (YHMU-A) (1) Control power source function block 1) PURY-P72, P96, P120YHMU-A Power source system (AC 230 / 460 V) Control system (DC 5 ~ 30 V) INV board Noise filter...
  • Page 322 [ IX Troubleshooting ] [YHMU-A] (2) Troubleshooting transmission power circuit of outdoor unit 1) PURY-P72, P96, P120YHMU-A Check the voltage at the indoor/outdoor transmission terminal block (TB3) of outdoor unit. Check whether the transmission line is disconnected, DC 24 ~ 30 V check for contact failure, and repair the problem.
  • Page 323: Refrigerant Leak

    [ IX Troubleshooting ] [5] Refrigerant Leak 1. Leak spot: In the case of extension pipe for indoor unit (Cooling season) 1) Mount a pressure gauge on the service check joint (CJ2) on the low-pressure side. 2) Stop all the indoor units, and close the high-pressure side refrigerant service valve (BV2) on the outdoor unit while the com- pressor is being stopped.
  • Page 324 [ IX Troubleshooting ] 3. Leak spot: In the case of extension pipe for indoor unit (Heating season) (1) Run all the indoor units in heating test run mode. 1) To run the indoor unit in test run mode, turn SW3-2 from ON to OFF when SW3-1 on the outdoor control board is ON. 2) Change the setting of the remote controller for all the indoor units to the heating mode.
  • Page 325: Compressor Replacement Instructions

    [ IX Troubleshooting ] [6] Compressor Replacement Instructions 1. Compressor Replacement Instructions [Compressor replacement procedures] Follow the procedures below (Steps 1 through 6) to remove the compressor components and replace the compressor. Reassemble them in the reverse order after replacing the compressor. 1.
  • Page 326 [ IX Troubleshooting ] Compressor covers (right and left) (The inside of the compressor cover is lined with sound insulation material.) Compressor cover (top) Crankcase heater 4. Remove the compressor cover (top). 5. Remove the compressor wires, compressor covers (right and left), and crankcase heater. Protection for the sealing material Suction piping...
  • Page 327 [ IX Troubleshooting ] 1. Solenoid valve block ASSY (SV4a, SV4b, SV4d), Check valve (CV4a, CV6a, CV8a, CV9a, CV10a) replacement instruc- tions * Following instructions show procedures for replacing service parts for Solenoid valve block ASSY (SV4a, SV4b, SV4d), Check valve (CV4a, CV6a, CV8a, CV9a, CV10a). Replace them properly according to the procedures. 1.
  • Page 328 [ IX Troubleshooting ] 2) Remove the control box. 1) Remove the upper and lower service panels (Panel FU and FB). 3) Remove the cable that is fixed to the Frame ASSY MU (upper) and MB (lower), and remove the Frame ASSY MU and MB.
  • Page 329 [ IX Troubleshooting ] (2) Check valve (CV4a, CV6a, CV8a, CV9a, CV10a) replacement procedures Remove the Solenoid valve block ASSY following "(1) Solenoid valve block ASSY (SV4a, SV4b, SV4d) replacement procedures" on the front page. Debraze H-M parts (total 6 places), and remove the Check valve ASSY. Replace the Check valve (CV4a, CV6a, CV8a, CV9a, CV10a) to be serviced while it is removed from the unit.
  • Page 330 [ IX Troubleshooting ] Detailed View of Part A Brazing or debrazing pipes Check valve replacement (φ28.6 [1-1/8"]) (φ15.88 [5/8"]) CV4a When replacing CV4a: CV6a Remove the brazing (φ15.88 [5/8"]) (φ28.6 [1-1/8"]) When replacing CV6a: (φ15.88 [5/8"]) Remove the brazing (φ15.88 (φ15.88 [5/8"]) [5/8"])
  • Page 331 [ IX Troubleshooting ] 2. Solenoid valve block ASSY (SV4a, SV4b, SV4c, SV4d), Check valve (CV4a, CV6a, CV8a, CV9a, CV10a) replacement instructions * Following instructions show procedures for replacing service parts for Solenoid valve block ASSY (SV4a, SV4b, SV4c, SV4d), Check valve (CV4a, CV6a, CV8a, CV9a, CV10a). Replace them properly according to the procedures. 1.
  • Page 332 [ IX Troubleshooting ] 2) Remove the control box and the partition plate. 1) Remove the upper and lower service panels (Panel FU and FB). 3) Remove the cable that is fixed to the Frame ASSY MU (upper) and MB (lower), and remove the Frame ASSY MU and MB.
  • Page 333 [ IX Troubleshooting ] (2) Check valve (CV4a, CV6a, CV8a, CV9a, CV10a) replacement procedures Remove the solenoid valve block ASSY following "(1) Solenoid valve block ASSY (SV4a, SV4b, SV4c, SV4d) replacement procedures" on the front page. Debraze I-O parts (total 7 places), and remove the Check valve ASSY. Replace the Check valve (CV4a, CV6a, CV8a, CV9a, CV10a) to be serviced while it is removed from the unit.
  • Page 334 [ IX Troubleshooting ] Detailed View of Part A Brazing or debrazing pipes Check valve replacement (φ28.6 [1-1/8"]) (φ15.88 [5/8"]) When replacing CV4a: Remove the brazing CV6a CV4a (φ15.88 [5/8"]) When replacing CV6a: Remove the brazing (φ28.6 [1-1/8"]) (φ25.4 [1"]) When replacing CV8a: Remove the brazing 3 (φ15.88 [5/8"])
  • Page 335 [ IX Troubleshooting ] 3. Solenoid valve (SV1a), Capillary tube ASSY (CP1) replacement instructions 1. Applicable models PURY-P72THMU-A(-BS), PURY-P72YHMU-A(-BS) ……Low pressure twinning kit (optional accessory) is built in. * The parts can be replaced without removing the Solenoid valve ASSY on the unit for the units that do not have built-in low pressure twinning kit (optional accessory).
  • Page 336: Servicing The Bc Controller

    [ IX Troubleshooting ] [7] Servicing the BC controller 1. Service panel *Special care must be taken when replacing heavy parts. Work procedure Explanatory figure 1) Remove the two lock nuts on the control box, loosen the other two, and remove the control box. 2) Remove the three fixing screws on the service panel, Ceiling panel Loosen...
  • Page 337 [ IX Troubleshooting ] 3. Thermistor (liquid pipe/gas pipe temperature detection) *Special care must be taken when replacing heavy parts. Work procedure Explanatory figure (1) Remove the service panel. 1) For TH11, TH12, and TH15, refer to 1. 1)-2). 2) For TH16, refer to (1)-1.2.3. (GA type only) (2) Remove the lead wire of the piping sensor from the control board.
  • Page 338 [ IX Troubleshooting ] 5. LEV Work procedure Explanatory figure (1) Remove the service panel.(Refer to (1)-1.2.3.) (2) Replace the LEV in trouble. LEV3 Secure enough service space in the ceiling for welding operation, and conduct the work carefully.If required, LEV1 dismount the unit from the ceiling, and conduct the work.
  • Page 339: Troubleshooting Using The Outdoor Unit Led Error Display

    [ IX Troubleshooting ] [8] Troubleshooting Using the Outdoor Unit LED Error Display If the LED error display appear as follows while all the SW1 switches are set to OFF, check the items under the applicable item numbers below. 1. Error code appears on the LED display. Refer to IX [2] Responding to Error Display on the Remote Controller.
  • Page 340: Led Monitor Display On The Outdoor Unit Board

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  • Page 342: How To Read The Led On The Service Monitor

    [ X LED Monitor Display on the Outdoor Unit Board ] X LED Monitor Display on the Outdoor Unit Board [1] How to Read the LED on the Service Monitor 1. How to read the LED By setting the DIP SW 1-1 through 1-10 (Switch number 10 is represented by 0), the operating condition of the unit can be monitored on the service monitor.
  • Page 343 [ X LED Monitor Display on the Outdoor Unit Board ] 3. Time data storage function The outdoor unit has a simple clock function that enables the unit to calculate the current time with an internal timer by receiv- ing the time set by the system controller, such as G(B)-50A. If an error (including a preliminary error) occurs, the error history data and the error detection time are stored into the service memory.
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