Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook
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Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook

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Table of Contents

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Summary of Contents for Mitsubishi Electric PQHY-P72TYHMU-A

  • Page 2: Safety Precautions

    Safety Precautions ŒBefore installing the unit, thoroughly read the following safety precautions. ŒObserve 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. ŒA 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: Table Of Contents

    CONTENTS IX Troubleshooting [1] Error Code Lists........................227 [2] Responding to Error Display on the Remote Controller............230 [3] Investigation of Transmission Wave Shape/Noise ............... 303 [4] Troubleshooting Principal Parts.................... 306 [5] Refrigerant Leak ........................343 [6] Compressor Replacement Instructions................. 347 [7] Servicing the BC controller ....................

  • Page 10: Table Of 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 11 - 2 -...

  • 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 WY/WR2 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 ŒPressurize 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 ŒTo evacuate air from the entire system Applying a vacuum through the check joints at the refrigerant service valve (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 (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: Ii 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..................... 26 [5] An Example of a System to which an MA Remote Controller is connected..... 27 [6] An Example of a System to which an ME Remote Controller is connected.....
  • Page 25 - 16 -...

  • Page 26: System Configuration

    [ II Restrictions ] II Restrictions [1] System configuration 1. Table of compatible indoor units <PQHY> The table below summarizes the types of indoor units that are compatible with different types of heat source units. Heat Composing units Maximum total capacity Maximum number Types of connectable in- source...

  • 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 heat source 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 heat source 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 DATABOOK 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 ] *3. Low-noise mode is valid when Dip SW4-4 on the heat source unit is set to OFF. When DIP SW4-4 is set to ON, 4 levels of on-DEMAND are possible, using different configurations of low-noise mode input and DEMAND input settings.When 2 or more heat source units exist in one refrigerant circuit system, 8 levels of on-DEMAND are possible.
  • Page 33 [ II Restrictions ] (8) Demand control 1) General outline of control Demand control is performed by using the external signal input to the 1-2 and 1-3 pins of CN3D on the heat source units (OC, OS1, and OS2). Between 2 and 12 steps of demand control is possible by setting DIP SW4-4 on the heat source units (OC, OS1, and OS2). Table.1 DipSW4-4 Demand control switch...
  • Page 34 [ II Restrictions ] 8-step demand control (When SW4-4 is set to ON on two heat source units) Demand capacity is shown below. 8-step demand No.2 CN3D 1-2P Open Short-circuit No.1 CN3D 1-2P 1-3P Open Short-circuit Open Short-circuit Open Open 100% Short-circuit Short-circuit...

  • Page 35: 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 indoor Connection to the system controller...

  • Page 36: 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 heat source unit (automatic address setup for both indoor and heat source units) <PQHY> (1) Sample control wiring Interlock operation with the ventilation unit Leave the male...
  • Page 37 [ II Restrictions ] ŒSet one of the MA remote controllers to sub. (Refer to (4) Wiring method MA remote controller function selection or the installation 1) Indoor-heat source transmission line manual for the MA remote controller for the setting meth- od.) Daisy-chain terminals M1 and M2 on the terminal block for indoor-heat source transmission line (TB3) on the...
  • Page 38 [ II Restrictions ] 2. An example of a system with one heat source unit to which 2 or more LOSSNAY units are connected (manual address setup for both indoor and heat source units) <PQHY> (1) Sample control wiring Interlock operation with the ventilation unit Leave the male Leave the male...
  • Page 39 [ II Restrictions ] 4) LOSSNAY connection (4) Wiring method Connect terminals M1 and M2 on the terminal block 1) Indoor-heat source transmission line (TB5) on the indoor unit (IC) to the appropriate terminals Same as [5] 1. on the terminal block (TB5) on LOSSNAY (LC). (Non-po- Shielded cable connection larized two-wire) ŒInterlock setting between the indoor units and LOSS-...
  • Page 40 [ II Restrictions ] 3. Group operation of units in a system with multiple heat source units <PQHY> (1) Sample control wiring Interlock operation with the ventilation unit Move the male connector Leave the male Leave the male Group Group from CN41 to CN40.
  • Page 41 [ II Restrictions ] ŒOnly use shielded cables. (4) Wiring method Shielded cable connection 1) Indoor-heat source transmission line Daisy-chain the S terminal on the terminal block (TB7) on Same as [5] 1. the heat source units (OC, OS1, OS2) with the shield ŒOnly use shielded cables.
  • Page 42 [ 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 a heat source unit <PQHY> (1) Sample control wiring Interlock operation with the ventilation unit Move the male connector Leave the male Leave the male...
  • Page 43 [ II Restrictions ] Daisy-chain the S terminal on the terminal block (TB7) on (4) Wiring method the heat source units (OC, OS1, OS2) with the shield 1) Indoor-heat source transmission line wire of the shielded cable. Short-circuit the earth terminal ) and the S terminal on the terminal block (TB7) on Same as [5] 1.
  • Page 44 [ II Restrictions ] 5. An example of a system in which a system controller is connected to the indoor-heat source transmission line (ex- cept LM adapter) <PQHY> (1) Sample control wiring Interlock operation with the ventilation unit Move the male connector Leave the male Leave the male from CN41 to CN40.
  • Page 45 [ II Restrictions ] Set the central control switch (SW2-1) on the control (4) Wiring method board of all heat source units to "ON." 1) Indoor-heat source transmission line ŒOnly use shielded cables. Daisy-chain terminals M1 and M2 on the terminal block Shielded cable connection for indoor-heat source transmission line (TB3) on the Daisy-chain the S terminal on the terminal block (TB7) on...
  • Page 46 [ II Restrictions ] 6. System with one heat source unit (automatic address setup for both indoor and heat source units) <PQRY> (1) Sample control wiring Interlock operation with the ventilation unit Leave the male Leave the male Group Group connector on connector on CN41 as it is.
  • Page 47 [ II Restrictions ] remote controllers. (4) Wiring method ŒSet one of the MA remote controllers as a sub controller. 1) Indoor-heat source transmission line (Refer to the Instruction Manual for the MA remote con- Daisy-chain terminals M1 and M2 of the terminal block troller for the setting method.) for indoor-heat source transmission line (TB3) on the Group operation of indoor units...
  • Page 48 [ II Restrictions ] 7. An example of a system with one heat source unit to which 2 or more LOSSNAY units are connected (manual address setup for both indoor and heat source units) <PQRY> (1) Sample control wiring Interlock operation with the ventilation unit Leave the male Leave the male Group...
  • Page 49 [ II Restrictions ] 2) Transmission line for centralized control (4) Wiring method No connection is required. 1) Indoor-heat source transmission line Daisy-chain terminals M1 and M2 of the terminal block 3) MA remote controller wiring for indoor-heat source transmission line (TB3) on the Same as [5] 6.
  • Page 50 [ II Restrictions ] 8. Group operation of units in a system with multiple heat source units <PQRY> (1) Sample control wiring Interlock operation with the ventilation unit Move the male connector Leave the male from CN41 to CN40. Group Group Group connector on...
  • Page 51 [ II Restrictions ] (4) Wiring method Shielded cable connection Daisy-chain the S terminal on the terminal block (TB7) on 1) Indoor-heat source transmission line the heat source units (OC, OS) with the shield wire of the Same as [5] 7. shielded cable.
  • Page 52 [ II Restrictions ] 9. A system in which a system controller is connected to the transmission line for centralized control and which is pow- ered from a heat source unit <PQRY> (1) Sample control wiring Interlock operation with the ventilation unit Move the male connector from CN41 to CN40.
  • Page 53 [ 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-heat source transmission line shielded cable. Short-circuit the earth terminal ( ) and Same as [5] 7.
  • Page 54 [ II Restrictions ] 10. An example of a system in which a system controller is connected to the indoor-heat source transmission line (ex- cept LM adapter) <PQRY> (1) Sample control wiring Interlock operation with the ventilation unit Move the male connector . from CN41 to CN40.
  • Page 55 [ II Restrictions ] heat source units to "ON." (4) Wiring method ŒOnly use shielded cables. 1) Indoor-heat source transmission line Shielded cable connection Daisy-chain terminals M1 and M2 of the terminal block for indoor- Daisy-chain the S terminal on the terminal block (TB7) on the heat heat source transmission line (TB3) on the heat source units (OC source units (OC, OS) with the shield wire of the shielded cable.
  • Page 56 [ II Restrictions ] 11. A system with multiple BC controller connections (with a system controller connected to the centralized control line) <PQRY> (1) Sample control wiring Leave the male Move the male connector connector on from CN41 to CN40 CN41 as it is.
  • Page 57 [ II Restrictions ] Set the central control switch (SW2-1) on the control board of all (4) Wiring method heat source units to "ON." ŒOnly use shielded cables. Indoor-heat source 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 heat source transmission line (TB3) on the heat source units (OC controller, OC, and OS with the shield of the shielded cable.

  • Page 58: An Example Of A System To Which An Me Remote Controller Is Connected

    [ II Restrictions ] [6] An Example of a System to which an ME Remote Controller is connected 1. A system in which a system controller is connected to the centralized control transmission line <PQHY> (1) Sample control wiring Interlock operation with the ventilation unit Move the male connector Leave the male...
  • Page 59 [ II Restrictions ] When 2 remote controllers are connected to the sys- (4) Wiring method 1) Indoor-heat source transmission line Refer to the section on Switch Setting. Same as [5] 1. Performing a group operation (including the group Shielded cable connection operation of units in different refrigerant circuits).
  • Page 60 [ II Restrictions ] 2. A system in which a system controller is connected to the centralized control transmission line <PQRY> (1) Sample control wiring Interlock operation with the ventilation unit Move the male connector Leave the male from CN41 to CN40. connector on SW2-1 OFF ON CN41 as it is.
  • Page 61 [ II Restrictions ] When 2 remote controllers are connected to the sys- (4) Wiring method 1) Indoor-heat source transmission line Refer to the section on Switch Setting. Same as [5] 8. Performing a group operation (including the group Shielded cable connection operation of units in different refrigerant circuits).

  • Page 62: An Example Of A System To Which Both Ma Remote Controller And Me Remote Controller Are Connected

    [ II Restrictions ] [7] An Example of a System to which both MA Remote Controller and ME Remote Controller are connected 1. PQHY (1) Sample control wiring Leave the male Leave the male Move the male connector connector on connector on Group from CN41 to CN40.
  • Page 63 [ II Restrictions ] Same as [5] 1. (4) Wiring method Group operation of indoor units 1) Indoor-heat source transmission line Same as [5] 1. Same as [5] 1. 4) ME remote controller wiring Shielded cable connection Same as [6] Same as [5] 1.
  • Page 64 [ II Restrictions ] 2. PQRY (1) Sample control wiring Move the male connector Leave the male from CN41 to CN40. Group Group connector on SW2-1 OFF ON CN41 as it is. SW2-1 OFF ON TB15 TB15 TB15 TB02 M1M2 M1M2 M1M2 M1M2...
  • Page 65 [ II Restrictions ] Group operation of indoor units (4) Wiring method Same as [5] 6. 1) Indoor-heat source transmission line 4) ME remote controller wiring Same as [5] 8. When 2 remote controllers are connected to the sys- Shielded cable connection Same as [5] 6.
  • Page 66 [ II Restrictions ] (5) Address setting method Pro- dress Facto- Unit or controller set- Setting method Notes ry set- dure ting ting range ŒAssign the smallest address to ŒAssign an address smaller than that of Opera- Main 01 to the main unit in the group.

  • Page 67: Restrictions On Pipe Length

    [ II Restrictions ] [8] Restrictions on Pipe Length (1) End branching <PQHY> P72 - P120 models Heat source unit Branch header First branch (Branch joint) Indoor Indoor Indoor Branch joint Indoor Indoor Indoor Unit: m [ft] Allowable length of Operation Pipe sections pipes...
  • Page 68 [ II Restrictions ] P144 - P360 models Provide a trap on the pipe (gas pipe only) within 2 m from the Note1 Install the pipe that connects the branch pipe and the heat source units joint pipe if the total length of the pipe that connects the joint in the way that it has a downward inclination toward the branch pipe.
  • Page 69 [ II Restrictions ] 1. Refrigerant pipe size <PQHY> (1) Diameter of the refrigerant pipe between the heat source unit and the first branch (heat source unit pipe size) Heat source unit set Liquid pipe size (mm) [inch] Gas pipe size (mm) [inch] name P72 model ø9.52 [3/8"]...
  • Page 70 [ II Restrictions ] (5) Size of the refrigerant pipe between the first distributor or the second distributor and heat source units Heat source unit Composing unit models Liquid pipe (mm) [inch] Gas pipe (mm) [inch] model P144 ø9.52 [3/8"] ø19.05 [3/4"] P168 ø9.52 [3/8"]...
  • Page 71 [ II Restrictions ] (1) System that requires 16 BC controller ports or fewer <System with only the main BC controller or standard BC con- troller> <PQRY> Heat source unit *Use a main BC controller when connecting the heat source units of P144 model or above.
  • Page 72 [ II Restrictions ] 1) To connect the P72 or P96 model of indoor units, use an optional junction pipe kit (Model: CMY-R160-J) and merge the two ports before connecting them. 2) Do not connect the P72 or P96 model of indoor units and other models of indoor units at the same port. 3) All the units that are connected to the same ports can only be operated in the same operation mode (cooling/heating).
  • Page 73 [ II Restrictions ] (2) System that requires more than 16 BC controller ports or with multiple BC controllers <Heat source unit P120 model or below> Heat source 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)
  • Page 74 [ 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 75 [ II Restrictions ] (3) System that requires more than 16 BC controller ports or with multiple BC controllers <Heat source unit P144 model or above> Heat source unit Heat source unit Branch joint : CMY-Q100VBK On the low-pressure side, the twinning kit connects to the pipes on site inside the heat source unit. When different capacity units are combined, connect the kit to the larger capacity heat source unit.
  • Page 76 [ 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 77 [ II Restrictions ] 2. Refrigerant pipe size <PQRY> (1) Between heat source unit and the first twinning pipe (Part A) Unit : mm [inch] Refrigerant pipe size Connection to heat source unit and BC control- Heat source unit Low-pressure pipe High-pressure pipe Low-pressure pipe High-pressure pipe...
  • Page 78 [ II Restrictions ] 3. Connecting the BC controller <PQRY> (1) Size of the pipe that fits the standard BC controller ports P72 - P120 models Connection: Brazed connection To heat source unit BC controller Reducer Branch joint (Model name:CMY-Y102S-G2) Junction pipe kit (Standard (Optional accessory)
  • Page 79 [ 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 80 [ 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) To heat Connection: Brazed connection source unit BC controller (main) Reducer (Standard supplied parts) Junction pipe kit (Model name: CMY-R160-J)
  • Page 81 [ II Restrictions ] (3) Size of the pipe that fits the sub BC controller ports Branch joint (Model name:CMY-Y102S-G2) (Optional accessory) Connection: Brazed connection To Main BC controller Junction pipe kit BC controller (sub) (Model name: CMY-R160-J) (Optional accessory) Reducer (Standard supplied parts) Indoor...

  • Page 82: Iii Heat Source Unit Components

    III Heat source Unit Components [1] Heat source Unit Components and Refrigerant Circuit............ 75 [2] Control Box of the Heat source Unit ................78 [3] Heat source Unit Circuit Board ..................81 [4] BC Controller Components ....................88 [5] Control Box of the BC Controller..................91 [6] BC Controller Circuit Board....................
  • Page 83 - 74 -...

  • Page 84: Heat Source Unit Components And Refrigerant Circuit

    [ III Heat source Unit Components ] III Heat source Unit Components [1] Heat source Unit Components and Refrigerant Circuit 1. Front view of a heat source unit (1) PQHY-P72, 96, 120THMU-A, PQRY-P72, 96, 120THMU-A PQHY-P72, 96, 120YHMU-A, PQRY-P72, 96, 120YHMU-A Top panel Control box Front panel...
  • Page 85 [ III Heat source Unit Components ] 2. Refrigerant circuit (1) PQHY-P72, 96, 120THMU-A, PQHY-P72, 96, 120YHMU-A LEVINV Check valve(CV7a) Solenoid valve(SV7a) Solenoid valve(SV9) Check valve(CV6a) Low-pressure sensor (63LS) Component cooler heat exchanger Solenoid valve block 4-way valve(21S4a) (SV4a, SV4b, SV4d) Check valve(CV5a) Solenoid valve(SV7b) Check valve(CV3a)
  • Page 86 [ III Heat source Unit Components ] (2) PQRY-P72, 96, 120THMU-A, PQRY-P72, 96, 120YHMU-A LEVINV Check valve(CV7a) Solenoid valve(SV7a) Solenoid valve(SV9) Low-pressure sensor (63LS) Double pipe(SCC) Check valve(CV6a) Component cooler heat exchanger 4-way valve(21S4a) Solenoid valve block Check valve (SV4a, SV4b, SV4d) (CV1a) Solenoid valve(SV7b) High-pressure...

  • Page 87: Control Box Of The Heat Source Unit

    [ III Heat source Unit Components ] [2] Control Box of the Heat source Unit (1) PQHY-P72, 96, 120THMU-A, PQRY-P72, 96, 120THMU-A DC reactor Electromagnetic relay Relay board Control board (DCL) (72C) Inrush current resistor Note2 Noise filter Terminal block for transmission line (TB3,TB7) M-NET board...
  • Page 88 [ III Heat source Unit Components ] (2) PQHY-P72, 96, 120YHMU-A, PQRY-P72, 96, 120YHMU-A <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 89 [ III Heat source Unit Components ] 1. Transformer Box (1) PQHY-P72, 96, 120YHMU-A, PQRY-P72, 96, 120YHMU-A Transformer (T03) Transformer (T02) HWE09080 - 80 -...

  • Page 90: Heat Source Unit Circuit Board

    [ III Heat source Unit Components ] [3] Heat source Unit Circuit Board 1. Heat source unit control board CNDC Serial communication signal input CN801 CN332 Bus voltage input GND INV board Pressure switch Output 18VDC Output 17VDC connection Serial communication signal output CNAC2 CN505 72C driving output...
  • Page 91 [ III Heat source Unit Components ] 2. M-NET board CNS2 CNIT CN04 CN102 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-heat source transmission line...
  • Page 92 [ III Heat source Unit Components ] 3. INV board (1) PQHY-P72, 96, 120THMU-A, PQRY-P72, 96, 120THMU-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(Control board)
  • Page 93 [ III Heat source Unit Components ] (2) PQHY-P72, 96, 120YHMU-A, PQRY-P72, 96, 120YHMU-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 5VDC output resistor Blink: Inverter error...
  • Page 94 [ III Heat source Unit Components ] 4. Relay board CN83 Pump interlock signal output Pump interlock signal output Pump interlock signal input CNAC4 Pump interlock signal input L1 input CNOUT2 CNPW 12 VDC input Pump interlock signal output Relay driving signal input (X21) Pump interlock signal output Relay driving signal input (X22) Relay driving signal input (X23)
  • Page 95 [ III Heat source Unit Components ] 5. Noise Filter (1) PQHY-P72, 96, 120THMU-A, PQRY-P72, 96, 120THMU-A TB21 CN02 Input/output （L1） Output  L1  L2 Grounding TB22 Input/output （L2） Fuse 250VAC 6.3A TB23 Input/output （L3） Fuse 250VAC 6.3A CN01 Input  L3  L2  L1 HWE09080...
  • Page 96 [ III Heat source Unit Components ] (2) PQHY-P72, 96, 120YHMU-A, PQRY-P72, 96, 120YHMU-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...

  • Page 97: Bc Controller Components

    [ III Heat source 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 HWE09080...
  • Page 98 [ III Heat source Unit Components ] (3) Rear view <GA type> TH16 LEV2 LEV3 TH11 LEV1 SVM2 Gas/Liquid separator Tube in tube heat exchanger SVM1 TH12 TH15 HWE09080 - 89 -...
  • Page 99 [ III Heat source 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 HWE09080 - 90 -...

  • Page 100: Control Box Of The Bc Controller

    [ III Heat source 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 HWE09080 - 91 -...

  • Page 101: Bc Controller Circuit Board

    [ III Heat source Unit Components ] [6] BC Controller Circuit Board 1. BC controller circuit board (BC board) HWE09080 - 92 -...
  • Page 102 [ III Heat source Unit Components ] 2. RELAY BOARD (RELAY 4 board) 3. RELAY BOARD (RELAY 10 board) HWE09080 - 93 -...
  • Page 103 [ III Heat source Unit Components ] HWE09080 - 94 -...

  • Page 104: Iv Remote Controller

    IV Remote Controller [1] Functions and Specifications of MA and ME Remote Controllers ........97 [2] Group Settings and Interlock Settings via the ME Remote Controller ......98 [3] Interlock Settings via the MA Remote Controller ............102 [4] Using the built-in Temperature Sensor on the Remote Controller ......... 103 HWE09080 - 95 -...
  • Page 105 - 96 -...

  • Page 106: 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: ME remote controller, which is connected on the indoor-heat source transmis- sion line, and MA remote controller, which is connected to each indoor unit. 1.

  • Page 107: 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 heat source units or to manually set up the indoor-heat source unit address.
  • Page 108 [ 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 109 [ 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 110 [ 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 111: 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 112: 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 113 [ IV Remote Controller ] HWE09080 - 104 -...

  • Page 114: V Electrical Wiring Diagram

    V Electrical Wiring Diagram [1] Electrical Wiring Diagram of the Heat source Unit............107 [2] Electrical Wiring Diagram of the BC Controller .............. 111 [3] Electrical Wiring Diagram of Transmission Booster............120 HWE09080 - 105 -...
  • Page 115 - 106 -...

  • Page 116: Electrical Wiring Diagram Of The Heat Source Unit

    [ V Electrical Wiring Diagram ] V Electrical Wiring Diagram [1] Electrical Wiring Diagram of the Heat source Unit (1) PQHY-P72, 96, 120THMU-A HWE09080 - 107 -...
  • Page 117 [ V Electrical Wiring Diagram ] (2) PQRY-P72, 96, 120THMU-A HWE09080 - 108 -...
  • Page 118 [ V Electrical Wiring Diagram ] (3) PQHY-P72, 96, 120YHMU-A HWE09080 - 109 -...
  • Page 119 [ V Electrical Wiring Diagram ] (4) PQRY-P72, 96, 120YHMU-A HWE09080 - 110 -...

  • Page 120: Electrical Wiring Diagram Of The Bc Controller

    [ V Electrical Wiring Diagram ] [2] Electrical Wiring Diagram of the BC Controller (1) CMB-P104NU-G model HWE09080 - 111 -...
  • Page 121 [ V Electrical Wiring Diagram ] (2) CMB-P105,106NU-G models HWE09080 - 112 -...
  • Page 122 [ V Electrical Wiring Diagram ] (3) CMB-P108,1010NU-G models HWE09080 - 113 -...
  • Page 123 [ V Electrical Wiring Diagram ] (4) CMB-P1013,1016NU-G models HWE09080 - 114 -...
  • Page 124 [ V Electrical Wiring Diagram ] (5) CMB-P108,1010NU-GA models HWE09080 - 115 -...
  • Page 125 [ V Electrical Wiring Diagram ] (6) CMB-P1013,1016NU-GA models LEV3 LEV2 HWE09080 - 116 -...
  • Page 126 [ V Electrical Wiring Diagram ] (7) CMB-P104NU-GB model HWE09080 - 117 -...
  • Page 127 [ V Electrical Wiring Diagram ] (8) CMB-P108NU-GB model HWE09080 - 118 -...
  • Page 128 [ V Electrical Wiring Diagram ] (9) CMB-P1016NU-HB model HWE09080 - 119 -...

  • Page 129: 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 Blue Stabilized power supply Black...

  • Page 130: Vi Refrigerant Circuit

    VI Refrigerant Circuit [1] Refrigerant Circuit Diagram ................... 123 [2] Principal Parts and Functions ..................126 HWE09080 - 121 -...
  • Page 131 - 122 -...

  • Page 132: Refrigerant Circuit Diagram

    [ VI Refrigerant Circuit ] VI Refrigerant Circuit [1] Refrigerant Circuit Diagram 1. Heat source unit (1) PQHY-P72, P96, P120 models 21S4a Solenoid valve block CV7a SV4a SV4b SV4d ST17 63H1 63HS1 SV7a SV7b 63LS Water circuit THINV LEVINV ST13 SV1a Component cooler heat...
  • Page 133 [ VI Refrigerant Circuit ] 2. BC controller (1) CMB-P104 - P1010NU-G Solenoid valve block TH15 Gas/Liquid separator LEV3 TH12 TH11 LEV1 TH16 Check valve block SVM1 (2) CMB-P108, P1013, P1016NU-GA (main) Solenoid valve block TH15 Gas/Liquid LEV3 separator SVM2 TH12 TH11 LEV1...
  • Page 134 [ VI Refrigerant Circuit ] (3) CMB-P104, P108NU-GB (sub) Solenoid valve block TH12 TH15 LEV3 HIC-C Check valve block (4) CMB-P1016NU-HB (sub) Solenoid valve block TH12 TH15 LEV3 HIC-C Check valve block HWE09080 - 125 -...

  • Page 135: Principal Parts And Functions

    [ VI Refrigerant Circuit ] [2] Principal Parts and Functions 1. Heat source unit Part Symbols Notes Usage Specifications Check method name (functions) Com- Adjusts the amount of circulating Low-pressure shell scroll pressor (Comp1) refrigerant by adjusting the operat- compressor ing frequency based on the oper- Wirewound resistance ating pressure data...
  • Page 136 [ VI Refrigerant Circuit ] Part Symbols Notes Usage Specifications Check method name (functions) Thermis- PQHY LEV1 is controlled based on the Degrees Celsius Resistance only TH2, TH3, and TH6 values check = 15k = 3460 0/80 PQHY Controls defrosting during heating R = 15 3460 (Pipe...
  • Page 137 [ VI Refrigerant Circuit ] Part Symbols Notes Usage Specifications Check method name (functions) Heater CH11 Heats the refrigerant in the com- Cord heater Resistance pressor 1035 ohm 51W check 4-way 21S4a Changeover between heating and AC208-230V Continuity valve cooling Dead: cooling cycle check with a Live: heating cycle...
  • Page 138 [ 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 139 [ 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 140 [ 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 141 [ 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 142 [ 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 143 [ VI Refrigerant Circuit ] HWE09080 - 134 -...

  • Page 144: Vii Control

    VII Control [1] Functions and Factory Settings of the Dipswitches ............137 [2] Controlling the Heat source Unit ..................143 [3] Controlling BC Controller ....................160 [4] Operation Flow Chart..................... 161 HWE09080 - 135 -...
  • Page 145 - 136 -...

  • Page 146: Functions And Factory Settings Of The Dipswitches

    [ VII Control ] VII Control [1] Functions and Factory Settings of the Dipswitches 1. Heat source 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 147 [ 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 148 [ VII Control ] Units that re- quire switch Function according to switch setting Switch setting timing setting Switch Function Note.2 Low-noise mode Capacity priority Low-noise mode Before being energized selection mode(Note 3) Backup heating Ineffective Effective Any time after power on 1) Unless otherwise specified, leave the switch to OFF where indicated by "-,"...
  • Page 149 [ 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-P-NMHU-E-F) model units detection position...
  • Page 150 [ VII Control ] (2) Address switch Actual indoor unit address setting varies in different systems. Refer to the installation manual for the heat source 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 151 [ 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 152: Controlling The Heat Source Unit

    [ VII Control ] [2] Controlling the Heat source Unit -1- Outline of Control Method ŒThe heat source 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).
  • Page 153 [ 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 the compressor on each heat source ON for 4 minutes.
  • Page 154 [ VII Control ] -6- Compressor Frequency Control ŒDepending on the capacity required, the frequency of the compressor is controlled to keep constant evaporation temperature (0°C [32°F] = 0.71 MPa [103 psi]) during cooling operation, and condensing temperature (49°C [120°F] = 2.88 MPa [418 psi]) during heating operation.
  • Page 155 [ VII Control ] -7- Refrigerant Recovery Control <PQHY> Recovery of refrigerant is performed during heating operation to prevent the refrigerant from accumulating inside the unit while it is stopped (unit in fan mode), or inside the indoor unit that is in cooling mode or in heating mode with thermo off. It is also performed during cooling operation to prevent an excessive amount of refrigerant from accumulating in the heat source heat exchanger.
  • Page 156 [ VII Control ] (2) Heat source unit heat exchanger capacity control patterns Solenoid valve Operation Model Operation mode pattern SV4a SV4b SV4d SV7a SV7b P72-P120 models Cooling Heating HWE09080 - 147 -...
  • Page 157 [ VII Control ] -10- Capacity Control of Heat Exchanger<PQRY> (1) Control method ŒDepending on the capacity required, the rotation speed of the heat source unit fan is controlled by the inverter to keep a con- stant condensing temperature of (water temperature +10°C [50°F]) during cooling operation and a constant evaporation tem- perature of (0°C [32°F] =0.71 <Pa [103psi]) during heating operation.
  • Page 158 [ VII Control ] -11- Subcool Coil Control (Linear Expansion Valve <LEV1>) <PQHY only> ŒThe OC, OS1, and OS2 controls the subcool coil individually. ŒThe LEV is controlled every 30 seconds to maintain constant the subcool at the heat source unit heat exchanger outlet that is calculated from the values of high pressure (63HS1) and liquid piping temperature (TH3), or the superheat that is calculated from the values of low pressure (63LS) and the bypass outlet temperature (TH2) of the subcool coil.
  • Page 159 [ VII Control ] (2) P144, P168, P192, P216, P240 models Initial startup mode starts. The compressor on the OC starts up. 60Hz The total operating load of the indoor unit after 5 minutes of operation is P96 or above. (*1 Qj The compressor on the OC starts up.
  • Page 160 [ VII Control ] (3) P264, P288, P312, P336, P360 models <PQHY only> Initial startup mode starts. The compressor on the OC starts up. 60Hz The total operating load of the indoor unit after 5 minutes of operation is P96 or above. ( *1 The total operating load of the indoor unit after 5 minutes of operation is between P96 and P400.
  • Page 161 [ VII Control ] -14- Emergency Operation Mode 1. Problems with the heat source unit ŒEmergency operation mode is a temporary operation mode in which the heat source unit that is not in trouble operates when one of the heat source units in the P144 through P240 models is in trouble or when one or two of the heat source units in the P264 through P360 models are in trouble.
  • Page 162 [ VII Control ] (2) Ending the emergency operation 1) End conditions When one of the following conditions is met, emergency operation stops, and the unit makes an error stop. ŒWhen the integrated operation time of compressor in cooling mode has reached four hours. ŒWhen the integrated operation time of compressor in heating mode has reached two hours.
  • Page 163 [ VII Control ] Emergency operation pattern (2 heat source units) OC failure OS failure pattern pattern Trouble Normal Normal Trouble Cooling Emergency Permitted Permitted operation Heating Permitted Permitted Capacity that matches Maximum total capacity the total capacity of the of indoor units (Note 1) operable heat source units...
  • Page 164 [ VII Control ] -15- Control Method <PQRY only> The control system configuration for the PQRY 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...
  • Page 165 [ VII Control ] -16- 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 166 [ VII Control ] -17- Operation Mode <PQHY> (1) Indoor unit operation mode The operation mode can be selected from the following 5 modes using the remote controller. Cooling mode Heating mode Dry mode Fan mode Stopped mode (2) Heat source unit operation mode Cooling mode All indoor units in operation are in cooling mode.
  • Page 167 [ VII Control ] -18- Operation Mode <PQRY> (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) Heat source unit operation mode Cooling only mode All indoor units in operation are in cooling mode.
  • Page 168 [ VII Control ] -19- DEMAND Control Cooling/heating operation can be prohibited (Thermo-OFF) by an external input to the heat source 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 heat source units. Twelve-step demand control is possible in the system with three heat source units.

  • Page 169: 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 SV A Port SV B SV C...

  • Page 170: Operation Flow Chart

    [ VII Control ] [4] Operation Flow Chart 1. Mode determination flowchart <PQHY> (1) Indoor unit (cooling, heating, dry, fan mode) Start Normal operation Error Breaker Unit in the stopped state turned on From heat source unit Operation SW turned on 1.
  • Page 171 [ VII Control ] (2) Heat source unit (cooling and heating modes) Start Normal operation Error Breaker Unit in the stopped state turned on "HO" / "PLEASE WAIT" blinks on the remote controller *Note 1 Indoor units registered to the remote controller From indoor unit Operation...
  • Page 172 [ 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 ON 3-minute restart prevention 1.
  • Page 173 [ VII Control ] (2) Heating operation Normal operation Heating operation Unit in the stopped state During test run mode 4-way valve ON Test run mode Thermostat ON 3-minute restart prevention 1. Indoor unit fan operation at 1. Indoor-heat source unit fan control Very Low speed 2.
  • Page 174 [ 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. Heat source unit (compressor) 1. Indoor unit fan stop intermittent operation 2.
  • Page 175 [ VII Control ] 1. Mode determination flowchart <PQRY> (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 176 [ VII Control ] (2) Heat source 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 on the remote controller *Note 1 Indoor units registered to the remote controller...
  • Page 177 [ 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 178 [ 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 179 [ VII Control ] (2) Heating operation Normal operation Heating operation Unit in the stopped state During test run mode 4-way valve ON Test run mode Thermostat 3-minute restart prevention 1. Indoor unit fan operation at 1. Indoor-heat source unit fan control Very Low speed 2.
  • Page 180 [ 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. Heat source unit (compressor) 1.
  • Page 181 [ VII Control ] HWE09080 - 172 -...

  • Page 182: Viii Test Run Mode

    VIII Test Run Mode [1] Items to be checked before a Test Run ................. 175 [2] Test Run Method ......................176 [3] Operating Characteristic and Refrigerant Amount ............177 [4] Adjusting the Refrigerant Amount .................. 177 [5] Refrigerant Amount Adjust Mode................... 182 [6] The following symptoms are normal.
  • Page 183 - 174 -...

  • Page 184: 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 185: 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 186: 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 187 [ VIII Test Run Mode ] 3. Amount of refrigerant to be added<PQHY> The amount of refrigerant that is shown in the table below is factory-charged to the heat source units. The amount necessary for extended pipe (field piping) is not included and must be added on site. Heat source unit model P120 Amount of pre-charged refrigerant in...
  • Page 188 [ VIII Test Run Mode ] (2) Example: PQHY-P144TSHMU-A/YSHMU-A 9.52 9.52 (3 m) (1 m) 9.52 (10 m) 15.88 (10 m) × Liquid separator 9.52 9.52 9.52 9.52 6.35 (10 m) (20 m) (10 m) (10 m) (10 m) 15.88 (30 m) model model model...
  • Page 189 [ VIII Test Run Mode ] 4. Amount of refrigerant to be added <PQRY> The amount of refrigerant that is shown in the table below is factory-charged to theheat source units. The amount necessary for extended pipe (field piping) is not included and must be added on site. Heat source unit model P120 Amount of pre-charged refrigerant...
  • Page 190 [ VIII Test Run Mode ] (2) Example Heat source unit 1 Heat source unit 2 Branch joint kit Indoor Branch joint (CMY-Y202-G2) (CMY-Y102L-G2) BC controller(HB) (CMY-Y102S-G2) BC controller H H′ Branch joint Reducer (P06 - P18) BC controller(HB) (CMY-Y102S-G2) (Supplied with the BC Controller) Junction pipe kit (CMY-R160-J)

  • Page 191: Refrigerant Amount Adjust Mode

    [ VIII Test Run Mode ] [5] Refrigerant Amount Adjust Mode 1. Procedures <PQHY> 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 heat source unit (OC only) is turned to ON, the unit goes into the refrigerant amount adjust mode, and the following sequence is followed.
  • Page 192 [ 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 193 [ VIII Test Run Mode ] 2. Procedures <PQRY> 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 heat source unit (OC only) is turned to ON, the unit goes into the refrigerant amount adjust mode, and the following sequence is followed.
  • Page 194 [ 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 195: 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 196: Standard Operation Data (Reference Data)

    [ VIII Test Run Mode ] [7] Standard Operation Data (Reference Data) 1. Single unit<PQHY> (1) Cooling operation Heat source unit model Item PQHY-P72YHMU-A PQHY-P96YHMU-A 26.7°C/19.4°C 26.7°C/19.4°C Indoor temperature DB/WB [80°F/67°F] [80°F/67°F] Heat source water temperature °C [ °F] 29.4[85] 29.4[85] 5.76 5.76...
  • Page 197 [ VIII Test Run Mode ] Heat source unit model Item PQHY-P120YHMU-A 26.7°C/19.4°C Indoor temperature DB/WB [80°F/67°F] Heat source water temperature °C [ °F] 29.4[85] 5.76 Heat source water flow rate [G/h] [1522] [gpm] [25.4] No. of connected units Unit Indoor No.
  • Page 198 [ VIII Test Run Mode ] (2) Heating operation Heat source unit model Item PQHY-P72YHMU-A PQHY-P96YHMU-A Indoor temperature DB/WB 21.1°C/- [70°F/-] 21.1°C/- [70°F/-] Heat source water temperature °C [ °F] 21.1[70] 21.1[70] 5.76 5.76 Heat source water flow rate [G/h] [1522] [1522] [gpm]...
  • Page 199 [ VIII Test Run Mode ] Heat source unit model Item PQHY-P120YHMU-A Indoor temperature DB/WB 21.1°C/- [70°F/-] Heat source water temperature °C [ °F] 21.1[70] 5.76 Heat source water flow rate [G/h] [1522] [gpm] [25.4] No. of connected units Unit Indoor No.
  • Page 200 [ VIII Test Run Mode ] 2. 2-unit combination<PQHY> (1) Cooling operation 2-unit combination Item PQHY-P144YSHMU-A PQHY-P72YHMU-A PQHY-P72YHMU-A Indoor temperature DB/WB 26.7°C/19.4°C[80°F/67°F] Heat source water temperature °C [ °F] 29.4[85] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4] [25.4] No.
  • Page 201 [ VIII Test Run Mode ] 2-unit combination Item PQHY-P168YSHMU-A PQHY-P96YHMU-A PQHY-P72YHMU-A Indoor temperature DB/WB 26.7°C/19.4°C[80°F/67°F] Heat source water temperature °C [ °F] 29.4[85] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4] [25.4] No. of connected units Unit Indoor No.
  • Page 202 [ VIII Test Run Mode ] 2-unit combination Item PQHY-P192YSHMU-A PQHY-P96YHMU-A PQHY-P96YHMU-A Indoor temperature DB/WB 26.7°C/19.4°C[80°F/67°F] Heat source water temperature °C [ °F] 29.4[85] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4] [25.4] No. of connected units Unit Indoor No.
  • Page 203 [ VIII Test Run Mode ] 2-unit combination Item PQHY-P216YSHMU-A PQHY-P120YHMU-A PQHY-P96YHMU-A Indoor temperature DB/WB 26.7°C/19.4°C[80°F/67°F] Heat source water temperature °C [ °F] 29.4[85] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4] [25.4] No. of connected units Unit Indoor No.
  • Page 204 [ VIII Test Run Mode ] 2-unit combination Item PQHY-P240YSHMU-A PQHY-P120YHMU-A PQHY-P120YHMU-A Indoor temperature DB/WB 26.7°C/19.4°C[80°F/67°F] Heat source water temperature °C [ °F] 29.4[85] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4] [25.4] No. of connected units Unit Indoor No.
  • Page 205 [ VIII Test Run Mode ] (2) Heating operation 2-unit combination Item PQHY-P144YSHMU-A PQHY-P72YHMU-A PQHY-P72YHMU-A Indoor temperature DB/WB 21.1°C/-[70°F/-] Heat source water temperature °C [ °F] 21.1[70] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4] [25.4] No. of connected units Unit Indoor No.
  • Page 206 [ VIII Test Run Mode ] 2-unit combination Item PQHY-P168YSHMU-A PQHY-P96YHMU-A PQHY-P72YHMU-A Indoor temperature DB/WB 21.1°C/-[70°F/-] Heat source water temperature °C [ °F] 21.1[70] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4] [25.4] No. of connected units Unit Indoor No.
  • Page 207 [ VIII Test Run Mode ] 2-unit combination Item PQHY-P192YSHMU-A PQHY-P96YHMU-A PQHY-P96YHMU-A Indoor temperature DB/WB 21.1°C/-[70°F/-] Heat source water temperature °C [ °F] 21.1[70] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4] [25.4] No. of connected units Unit Indoor No.
  • Page 208 [ VIII Test Run Mode ] 2-unit combination Item PQHY-P216YSHMU-A PQHY-P120YHMU-A PQHY-P96YHMU-A Indoor temperature DB/WB 21.1°C/-[70°F/-] Heat source water temperature °C [ °F] 21.1[70] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4] [25.4] No. of connected units Unit Indoor No.
  • Page 209 [ VIII Test Run Mode ] 2-unit combination Item PQHY-P240YSHMU-A PQHY-P120YHMU-A PQHY-P120YHMU-A Indoor temperature DB/WB 21.1°C/-[70°F/-] Heat source water temperature °C [ °F] 21.1[70] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4] [25.4] No. of connected units Unit Indoor No.
  • Page 210 [ VIII Test Run Mode ] 3. 3-unit combination<PQHY> (1) Cooling operation 3-unit combination PQHY-P264YSHMU-A Item PQHY- PQHY- PQHY- P96YHMU-A P96YHMU-A P72YHMU-A Indoor temperature DB/WB 26.7°C/19.4°C [80°F/67°F] Heat source water temperature °C [°F] 29.4 [85] m3/h 5.76 5.76 5.76 Heat source water flow rate [1522] [1522] [1522]...
  • Page 211 [ VIII Test Run Mode ] 3-unit combination PQHY-P288YSHMU-A Item PQHY- PQHY- PQHY- P96YHMU-A P96YHMU-A P96YHMU-A Indoor temperature DB/WB 26.7°C/19.4°C [80°F/67°F] Heat source water temperature °C [°F] 29.4 [85] m3/h 5.76 5.76 5.76 Heat source water flow rate [1522] [1522] [1522] [25.4] [25.4]...
  • Page 212 [ VIII Test Run Mode ] 3-unit combination PQHY-P312YSHMU-A Item PQHY- PQHY- PQHY- P120YHMU-A P96YHMU-A P96YHMU-A Indoor temperature DB/WB 26.7°C/19.4°C [80°F/67°F] Heat source water temperature °C [°F] 29.4 [85] m3/h 5.76 5.76 5.76 Heat source water flow rate [1522] [1522] [1522] [25.4] [25.4]...
  • Page 213 [ VIII Test Run Mode ] 3-unit combination PQHY-P336YSHMU-A Item PQHY- PQHY- PQHY- P120YHMU-A P120YHMU-A P96YHMU-A Indoor temperature DB/WB 26.7°C/19.4°C [80°F/67°F] Heat source water temperature °C [°F] 29.4 [85] m3/h 5.76 5.76 5.76 Heat source water flow rate [1522] [1522] [1522] [25.4] [25.4]...
  • Page 214 [ VIII Test Run Mode ] 3-unit combination PQHY-P360YSHMU-A Item PQHY- PQHY- PQHY- P120YHMU-A P120YHMU-A P120YHMU-A Indoor temperature DB/WB 26.7°C/19.4°C [80°F/67°F] Heat source water temperature °C [°F] 29.4 [85] m3/h 5.76 5.76 5.76 Heat source water flow rate [1522] [1522] [1522] [25.4] [25.4]...
  • Page 215 [ VIII Test Run Mode ] (2) Heating operation 3-unit combination PQHY-P264YSHMU-A Item PQHY- PQHY- PQHY- P96YHMU-A P96YHMU-A P72YHMU-A Indoor temperature DB/WB 21.1°C/- [70°F/-] Heat source water temperature °C [°F] 21.1 [70] m3/h 5.76 5.76 5.76 Heat source water flow rate [1522] [1522] [1522]...
  • Page 216 [ VIII Test Run Mode ] 3-unit combination PQHY-P288YSHMU-A Item PQHY- PQHY- PQHY- P96YHMU-A P96YHMU-A P96YHMU-A Indoor temperature DB/WB 21.1°C/- [70°F/-] Heat source water temperature °C [°F] 21.1 [70] m3/h 5.76 5.76 5.76 Heat source water flow rate [1522] [1522] [1522] [25.4] [25.4]...
  • Page 217 [ VIII Test Run Mode ] 3-unit combination PQHY-P312YSHMU-A Item PQHY- PQHY- PQHY- P120YHMU-A P96YHMU-A P96YHMU-A Indoor temperature DB/WB 21.1°C/- [70°F/-] Heat source water temperature °C [°F] 21.1 [70] m3/h 5.76 5.76 5.76 Heat source water flow rate [1522] [1522] [1522] [25.4] [25.4]...
  • Page 218 [ VIII Test Run Mode ] 3-unit combination PQHY-P336YSHMU-A Item PQHY- PQHY- PQHY- P120YHMU-A P120YHMU-A P96YHMU-A Indoor temperature DB/WB 21.1°C/- [70°F/-] Heat source water temperature °C [°F] 21.1 [70] m3/h 5.76 5.76 5.76 Heat source water flow rate [1522] [1522] [1522] [25.4] [25.4]...
  • Page 219 [ VIII Test Run Mode ] 3-unit combination PQHY-P360YSHMU-A Item PQHY- PQHY- PQHY- P120YHMU-A P120YHMU-A P120YHMU-A Indoor temperature DB/WB 21.1°C/- [70°F/-] Heat source water temperature °C [°F] 21.1 [70] m3/h 5.76 5.76 5.76 Heat source water flow rate [1522] [1522] [1522] [25.4] [25.4]...
  • Page 220 [ VIII Test Run Mode ] 4. Single unit<PQRY> (1) Cooling only operation Heat source unit model Item PQRY-P72YHMU-A PQRY-P96YHMU-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 temperature DB/WB [80 °F/67 °F] [80 °F/67 °F] Heat source water temperature °C [ °F] 29.4[85] 29.4[85]...
  • Page 221 [ VIII Test Run Mode ] Heat source unit model Item PQRY-P120YHMU-A Model name of BC controller CMB-P104NU-G 26.7°C/19.4°C Indoor temperature DB/WB [80 °F/67 °F] Heat source water temperature °C [ °F] 29.4[85] 5.76 Heat source water flow rate [G/h] [1522] [gpm] [25.4]...
  • Page 222 [ VIII Test Run Mode ] (2) Heating only operation Heat source unit model Item PQRY-P72YHMU-A PQRY-P96YHMU-A Model name of BC controller CMB-P104NU-G CMB-P104NU-G 21.1°C/í 21.1°C/í Indoor temperature DB/WB [70 °F/í] [70 °F/í] Heat source water temperature °C [ °F] 21.1[70] 21.1[70] 5.76...
  • Page 223 [ VIII Test Run Mode ] Heat source unit model Item PQRY-P120YHMU-A Model name of BC controller CMB-P104NU-G 21.1°C/í Indoor temperature DB/WB [70 °F/í] Heat source water temperature °C [ °F] 21.1[70] 5.76 Heat source water flow rate [G/h] [1522] [gpm] [25.4] No.
  • Page 224 [ VIII Test Run Mode ] 5. 2-unit combination<PQRY> (1) Cooling only operation 2-unit combination Item PQRY-P144YSHMU-A PQRY-P72YHMU-A PQRY-P72YHMU-A Model name of BC controller CMB-P108NU-GA Indoor temperature DB/WB 26.7°C/19.4°C [80 °F/67 °F] Heat source water temperature °C [ °F] 29.4 [85] 5.76 5.76 Heat source water flow rate...
  • Page 225 [ VIII Test Run Mode ] 2-unit combination Item PQRY-P168YSHMU-A PQRY-P96YHMU-A PQRY-P72YHMU-A Model name of BC controller CMB-P108NU-GA Indoor temperature DB/WB 26.7°C/19.4°C [80 °F/67 °F] Heat source water temperature °C [ °F] 29.4 [85] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4]...
  • Page 226 [ VIII Test Run Mode ] 2-unit combination Item PQRY-P192YSHMU-A PQRY-P96YHMU-A PQRY-P96YHMU-A Model name of BC controller CMB-P108NU-GA Indoor temperature DB/WB 26.7°C/19.4°C [80 °F/67 °F] Heat source water temperature °C [ °F] 29.4 [85] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4]...
  • Page 227 [ VIII Test Run Mode ] 2-unit combination Item PQRY-P216YSHMU-A PQRY-P120YHMU-A PQRY-P96YHMU-A Model name of BC controller CMB-P108NU-GA Indoor temperature DB/WB 26.7°C/19.4°C [80 °F/67 °F] Heat source water temperature °C [ °F] 29.4 [85] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4]...
  • Page 228 [ VIII Test Run Mode ] 2-unit combination Item PQRY-P240YSHMU-A PQRY-P120YHMU-A PQRY-P120YHMU-A Model name of BC controller CMB-P108NU-GA Indoor temperature DB/WB 26.7°C/19.4°C [80 °F/67 °F] Heat source water temperature °C [ °F] 29.4 [85] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4]...
  • Page 229 [ VIII Test Run Mode ] (2) Heating only operation 2-unit combination Item PQRY-P144YSHMU-A PQRY-P72YHMU-A PQRY-P72YHMU-A Model name of BC controller CMB-P108NU-GA Indoor temperature DB/WB 21.1°C/- [70 °F/-] Heat source water temperature °C [ °F] 21.1 [70] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4]...
  • Page 230 [ VIII Test Run Mode ] 2-unit combination Item PQRY-P168YSHMU-A PQRY-P96YHMU-A PQRY-P72YHMU-A Model name of BC controller CMB-P108NU-GA Indoor temperature DB/WB 21.1°C/- [70 °F/-] Heat source water temperature °C [ °F] 21.1 [70] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4]...
  • Page 231 [ VIII Test Run Mode ] 2-unit combination Item PQRY-P192YSHMU-A PQRY-P96YHMU-A PQRY-P96YHMU-A Model name of BC controller CMB-P108NU-GA Indoor temperature DB/WB 21.1°C/- [70 °F/-] Heat source water temperature °C [ °F] 21.1 [70] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4]...
  • Page 232 [ VIII Test Run Mode ] 2-unit combination Item PQRY-P216YSHMU-A PQRY-P120YHMU-A PQRY-P96YHMU-A Model name of BC controller CMB-P108NU-GA Indoor temperature DB/WB 21.1°C/- [70 °F/-] Heat source water temperature °C [ °F] 21.1 [70] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4]...
  • Page 233 [ VIII Test Run Mode ] 2-unit combination Item PQRY-P240YSHMU-A PQRY-P120YHMU-A PQRY-P120YHMU-A Model name of BC controller CMB-P108NU-GA Indoor temperature DB/WB 21.1°C/- [70 °F/-] Heat source water temperature °C [ °F] 21.1 [70] 5.76 5.76 Heat source water flow rate [1522] [1522] [25.4]...
  • Page 234 IX Troubleshooting [1] Error Code Lists ......................227 [2] Responding to Error Display on the Remote Controller..........230 [3] Investigation of Transmission Wave Shape/Noise............303 [4] Troubleshooting Principal Parts ..................306 [5] Refrigerant Leak ......................343 [6] Compressor Replacement Instructions................347 [7] Servicing the BC controller ....................
  • Page 235 - 226 -...

  • Page 236: 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 0403 4300 Serial communication error 1102 1202 Discharge temperature fault 1301 Low pressure fault 1302 1402 High pressure fault...
  • Page 237 [ 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 OA processing unit pipe 5102 1217 fault temperature (TH2) HIC bypass circuit outlet temperature (TH2) Indoor unit gas-side pipe temperature (TH23)
  • Page 238 [ IX Troubleshooting ] Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code [115] ACCT sensor fault [117] ACCT sensor circuit fault 5301 4300 [119] Open-circuited IPM/Loose ACCT connector [120] Faulty ACCT wiring 5701 Loose float switch connector Remote controller board fault (nonvolatile memory...

  • Page 239: Responding To Error Display On The Remote Controller

    [ IX Troubleshooting ] [2] Responding to Error Display on the Remote Controller 1. Error Code 0403 Serial communication error 2. Error definition and error detection method Serial communication error between the control board and the INV board on the compressor. Detail code 01: Between the control board and the INV board 3.
  • Page 240 [ 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 heat source unit stops once, turns to anti-restart mode for 3 minutes, and restarts after 3 minutes automatically.
  • Page 241 [ 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 242 [ IX Troubleshooting ] 1. Error Code 1302 High pressure fault 1 (Heat source 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 heat source stops once, turns to antirestart mode for 3 minutes, and restarts after 3 minutes automatically.
  • Page 243 [ IX Troubleshooting ] 1. Error Code 1302 High pressure fault 2 (Heat source 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 244 [ IX Troubleshooting ] 1. Error Code 2000 Pump interlock error 2. Error definition and error detection method 1) This error is detected by the pump interlock circuit (TB8 3-4). 2) If it is detected that the pump interlock circuit (TB8 3-4) is open (first detection) during operation or immediately before startup, the heat source unit stops and goes into the 10-minute restart delay mode.
  • Page 245 [ IX Troubleshooting ] 1. Error Code 2134 Abnormal water temperature 2. Error definition and error detection method 1) If a water inlet pipe temperature (TH7) of 5°C[41ºF] or below OR 50°C[122ºF] or above is detected (first detection) during op- eration, the heat source unit stops, goes into the 3-minute restart delay mode, and automatically restarts after three minutes.
  • Page 246 [ IX Troubleshooting ] 1. Error Code 2135 Water heat exchanger freeze up 2. Error definition and error detection method 1) If either of the following conditions is detected (first detection) during operation, the heat source unit stops, goes into the 3- minute restart delay mode, and automatically restarts after three minutes.
  • Page 247 [ 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 248 [ 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 249 [ 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 250 [ 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 251 [ IX Troubleshooting ] 1. Error Code 2503 Drain sensor (Thd) fault 2. Error definition and error detection method ŒIf 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 252 [ 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 253 [ IX Troubleshooting ] 1. Error Code 4102 (THMU-A) Open phase 2. Error definition and error detection method ŒAn open phase of the power supply (L1 phase, L2 phase) was detected at power on. ŒThe 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 254 [ IX Troubleshooting ] 1. Error Code 4102 (YHMU-A) Open phase 2. Error definition and error detection method ŒAn open phase of the power supply (L1 phase, L2 phase) was detected at power on. ŒThe 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 255 [ IX Troubleshooting ] 1. Error Code 4106 <Transmission power supply fault error detail FF (Heat source 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 256 [ IX Troubleshooting ] 1. Error Code 4115 (THMU-A) 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 257 [ IX Troubleshooting ] 1. Error Code 4116 RPM error/Motor error 2. Error definition and error detection method ŒLOSSNAY The motor keep running even if the power is OFF. The thermal overload relay is ON. (Only for the three-phase model) ŒIndoor 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 258 [ IX Troubleshooting ] 1. Error Code 4220 (THMU-A) 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 instantaneous stop when the detection result is abnormal or a power failure occurs.
  • Page 259 [ IX Troubleshooting ] 1. Error Code 4220 (YHMU-A) 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 260 [ IX Troubleshooting ] 1. Error Code 4220 (THMU-A) 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 261 [ IX Troubleshooting ] 1. Error Code 4220 (YHMU-A) 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 262 [ 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, P96, P120 models 100°C [212°F] 3. Cause, check method and remedy Cause Check method and remedy Air passage blockage...
  • Page 263 [ 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 264 [ IX Troubleshooting ] 1. Error Code 4250 (THMU-A) IPM error (Detail code 101) 2. Error definition and error detection method IPM error signal is detected. 3. Cause, check method and remedy Cause Check method and remedy Inverter output related Refer to IX [4] -6- (2) [1]-[4].(page 330) Refer to section -6- "Inverter (THMU-A)"...
  • Page 265 [ IX Troubleshooting ] 1. Error Code 4250 (THMU-A) Instantaneous overcurrent (Detail code 106) Overcurrent (Detail code 107) 2. Error definition and error detection method Overcurrent 123 Apeak or 42 Arms and above is detected by the current sensor. 3. Cause, check method and remedy Cause Check method and remedy Inverter output related...
  • Page 266 [ IX Troubleshooting ] 1. Error Code 4250 Short-circuited IPM/Ground fault (Detail code 104) 2. Error definition and error detection method When IPM/IGBT short damage or grounding on the load side is detected just before starting the inverter. 3. Cause, check method and remedy Cause Check method and remedy Grounding fault compressor...
  • Page 267 [ IX Troubleshooting ] 1. Error Code 4250 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. Cause, Check method and remedy Cause Check method and remedy Short - circuited compressor...
  • Page 268 [ 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 269 [ IX Troubleshooting ] 1. Error Code 5102 HIC bypass circuit outlet temperature sensor (TH2) fault (Heat source unit) 5103 Heat exchanger outlet temperature sensor (TH3) fault (Heat source unit) 5104 Discharge temperature sensor (TH4) fault (Heat source unit) 5105 Accumulator inlet temperature sensor (TH5) fault (Heat source unit) 5106 HIC circuit outlet temperature sensor (TH6) fault (Heat source unit)
  • Page 270 [ IX Troubleshooting ] 1. Error Code 5110 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 271 [ IX Troubleshooting ] 1. Error Code 5201 High-pressure sensor fault (63HS1) 2. Error definition and error detection method ŒIf the high pressure sensor detects 0.098MPa [14psi] or less during the operation, the heat source 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 272 [ 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 273 [ IX Troubleshooting ] 1. Error Code 5301 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 274 [ 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 275 [ 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 276 [ 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 277 [ IX Troubleshooting ] 1. Error Code 6603 Transmission line bus busy error 2. Error definition and error detection method ŒGenerated error when the command cannot be transmitted for 4-10 minutes in a row due to bus-busy ŒGenerated 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 278 [ 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 279 [ 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 280 [ 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 281 [ 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 282 [ 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 283 [ 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 284 [ 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 285 [ 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 286 [ 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 287 [ IX Troubleshooting ] 1. Error Code 6608 No response error 2. Error definition and error detection method ŒWhen no response command is returned although acknowledgement (ACK) is received after transmission, an error is detect- ŒWhen 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 288 [ IX Troubleshooting ] 1. Error Code 6831 MA controller signal reception error (No signal reception) 2. Error definition and error detection method ŒCommunication between the MA remote controller and the indoor unit is not done properly. ŒNo proper data has been received for 3 minutes. 3.
  • Page 289 [ IX Troubleshooting ] 1. Error Code 6832 MA remote controller signal transmission error (Synchronization error) 2. Error definition and error detection method ŒMA remote controller and the indoor unit is not done properly. ŒFailure to detect opening in the transmission path and unable to send signals Indoor unit : 3 minutes Remote controller : 6 seconds 3.
  • Page 290 [ IX Troubleshooting ] 1. Error Code 6833 MA remote controller signal transmission error (Hardware error) 2. Error definition and error detection method ŒCommunication between the MA remote controller and the indoor unit is not done properly. ŒAn error occurs when the transmitted data and the received data differ for 30 times in a row. 3.
  • Page 291 [ IX Troubleshooting ] 1. Error Code 6834 MA controller signal reception error (Start bit detection error) 2. Error definition and error detection method ŒCommunication between the MA remote controller and the indoor unit is not done properly. ŒNo proper data has been received for 2 minutes. 3.
  • Page 292 [ 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 heat source unit exceeds limitations. 3. Error source, cause, check method and remedy, Error source Cause Check method and remedy...
  • Page 293 [ 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 heat source unit 3. Error source, cause, check method and remedy Error source Cause Check method and remedy Heat source...
  • Page 294 [ 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 295 [ 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 Heat source Erroneous setting of OC unit address Check that the heat source unit and BC con-...
  • Page 296 [ 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 297 [ 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 heat source unit in the same system. 3.
  • Page 298 [ IX Troubleshooting ] 1. Error Code 7113 Function setting error 2. Error source, cause, check method and remedy Error source Cause Check method and remedy Heat source Wiring failure Control board connector unit Check the CNTYP2,4,5 connector connection. Inverter board connector Check the CNTYP connector connection.
  • Page 299 [ 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 300 [ 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 heat source unit.
  • Page 301 [ 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 heat source unit.
  • Page 302 [ IX Troubleshooting ] Flow chart Even if the operation button on the remote controller is pressed, the indoor and the heat source units do not start running. HWE09080 - 293 -...
  • Page 303 [ IX Troubleshooting ] In case of ME 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 indoor unit.
  • Page 304 [ IX Troubleshooting ] In case of ME 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. ŒThe main power of the indoor unit (AC208/230V) is not on.
  • Page 305 [ IX Troubleshooting ] In case of ME 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) Heat source unit address is set to "00" 2) A wrong address is set.
  • Page 306 [ IX Troubleshooting ] In case of ME 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 307 [ IX Troubleshooting ] Both for MA remote controller and ME 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 308 [ 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 309 [ 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 ŒFaulty detection of pressure sensor.
  • Page 310 [ IX Troubleshooting ] Cause Check method and remedy Indoor unit LEV malfunction Refer to the page of LEV troubleshooting Insufficient refrigerant flows due to LEV malfunction ( [4] -4- ).(page 310) (not enough opening). Temperature reading error on the indoor unit piping Check the thermistor.
  • Page 311 [ IX Troubleshooting ] 3. Phenomena Heat source 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 312: 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 heat source unit and the indoor unit (ME remote controller) through M-NET transmission. Noise interference on the transmission line will interrupt the normal transmission, leading to erroneous operation.
  • Page 313 [ 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 314 [ 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 315: 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 316 [ 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 317 [ 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 318 [ IX Troubleshooting ] Refrigerant Circuit diagram <PQHY> Solenoid valve block CV7a SV4a SV4b SV4d SV7a SV7b Water circuit THINV LEVINV ST13 Component cooler heat exchanger CV3a CV4a CV6a LEV2b LEV2a LEV1 Solenoid valve block(three compartments) 1 is located behind 3 HWE09080 - 309 -...
  • Page 319 [ IX Troubleshooting ] Refrigerant Circuit diagram <PQRY> Solenoid valve block CV7a SV4a SV4b SV4d SV7a SV7b Water circuit THINV LEVINV ST13 Component cooler heat exchanger CV3a CV2a CV5a CV4a CV6a Solenoid valve block(three compartments) 1 is located behind 3 (4) In the case of SV9 (Bypass valve) This solenoid valve opens when energized (when the relay is on) This valve turns on when the value of 63HS1 is greater than 3.5 MPa [507psi] during Heating-only or Heating-main operation...
  • Page 320 [ IX Troubleshooting ] Heat source control board Intermediate connector DC12V Brown Blue Drive circuit Blue Brown Orange Yellow Yellow White Red Orange White Note. The connector numbers on the intermediate connector and the connector on the control board differ. Check the color of the lead wire to judge the number.
  • Page 321 [ IX Troubleshooting ] (2) Heat source LEV (LEV1,LEVINV) The valve opening changes according to the number of pulses. 1) Connections between the heat source control board and LEV Heat source control board DC 12V Brown Drive circuit Blue Orange Yellow White 2) Pulse signal output and valve operation...
  • Page 322 [ IX Troubleshooting ] (3) Judgment methods and possible failure mode The specifications of the heat source unit (heat source LEV), indoor unit (indoor LEV),and BC controller (BC controller LEV) differ.Therefore, remedies for each failure may vary. Check the remedy specified for the appropriate LEV as indicated in the right column.
  • Page 323 [ IX Troubleshooting ] (4) Heat source unit LEV (LEV1,LEVINV) coil removal procedure 1) LEV component As shown in the figure, the heat source LEV is made in such a way that the coils and the body can be separated. Body Coils Stopper...
  • Page 324 [ IX Troubleshooting ] (5) Heat source unit LEV (LEV2a,2b) coil removal procedure Motor Driver Locknut Bellows Valve assembling Refrigerant Circuit Valve body side Orifice Notes on the procedure 1) Do not put undue pressure on the motor. 2) Do not use motors if dropped. 3) Do not remove the cap until immediately before the procedure.
  • Page 325 [ IX Troubleshooting ] Replacement procedure 1) Stop the air conditioner. After checking that the air conditioner is stopped, turn off the power of the heat source unit. 2) Prepare two spanners. Hold the valve body with one spanner and loosen the locknut with another one. Turning the locknut counter-clockwise from motor side view can loosen it.

  • Page 326: Pressure Sensor

    [ IX Troubleshooting ] -5- 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 327 [ 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 Indoor heating SC small Non-cooling Normal Non-cooling SC11 large SC11 large SC11 large Heating indoor Thermo ON...

  • Page 328: Temperature Sensor

    [ 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 2 Check the thermistor resistor. Compare the temperature corresponding to the resistance measured by the thermistor and the temperature measured by a commercially...
  • Page 329 [ 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. ŒPull out the sensor connector from the I/O board, Do not pull the sensor by holding the lead wire. ŒMeasure the resistance with such as a tester.
  • Page 330 [ 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. Fault is found. Repair the fault.
  • Page 331 [ 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 332 [ 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 333 [ 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 334 [ 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 335 [ 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 336 [ 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 1.6 ohm. * Before measuring the resistance, pull out the connector. HWE09080 - 327 -...
  • Page 337 [ IX Troubleshooting ] [THMU-A] -6- Inverter (THMU-A) ŒReplace 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.) ŒReplace the defective components if the inverter is found to be defective.
  • Page 338 [ 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 in X LED Monitor 4250, 4220, 4230, 4240,4260, 5301, 0403 Display on the Heat source Unit Board. Take appropriate measures to the error code and the error details in ac- cordance with IX.
  • Page 339 [ IX Troubleshooting ] [THMU-A] (2) Inverter output related troubles Items to be checked Phenomena Remedy (1) Disconnect the invert- IPM/overcurrent breaker trip Replace the INV board. Check the INV er output wire from Error code: 4250 board error the terminals of the Detail code: No.
  • Page 340 [ 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 341 [ IX Troubleshooting ] [THMU-A] (5) 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 Rush current Measure the resistance between terminals: 22 ohm protection resis- R1(R2) Electromagnetic...
  • Page 342 [ IX Troubleshooting ] [YHMU-A] -6- Inverter (YHMU-A) ŒReplace only the compressor if only the compressor is found to be defective. ŒReplace the defective components if the inverter is found to be defective. ŒIf both the compressor and the inverter are found to be defective, replace the defective component(s) of both devices. (1) Inverter-related problems: Troubleshooting and remedies 1) The INV board has a large-capacity electrolytic capacitor, in which residual voltage remains even after the main power is turned off, posing a risk of electric shock.
  • Page 343 [ 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 in X LED Monitor 4250, 4220, 4230, 4240,4260, 5301, 0403 Display on the Heat source Unit Board. Take appropriate measures to the error code and the error details in ac- cordance with IX.
  • Page 344 [ 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 Error code: 4250 INV board er- the terminals of the Detail code: No.
  • Page 345 [ 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 346 [ 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 347 [ 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 SC-L1 5 - 200 ohm SC-L2 5 - 200 ohm SC-L3 5 - 200 ohm Black SC-P2 FT-N...
  • Page 348 [ IX Troubleshooting ] [THMU-A] -7- Control Circuit (THMU-A) (1) Control power source function block Power source system (AC 208 / 230 V) Control system (DC 5 ~ 30 V) Noise filter INV board Smoothing capacitor Inverter Compressor Noise filter Rectifier AC 208 / 230 V Terminal block for...
  • Page 349 [ IX Troubleshooting ] [THMU-A] (2) Troubleshooting transmission power circuit of heat source unit Check the voltage at the indoor/heat source transmission terminal block (TB3) of heat source unit. DC 24 ~ 30 V Check whether the transmission line is disconnected, check for contact failure, and repair the problem.
  • Page 350 [ IX Troubleshooting ] [YHMU-A] -7- Control Circuit (YHMU-A) (1) Control power source function block Power source system (AC 230 / 460 V) Control system (DC 5 ~ 30 V) INV board Noise filter Compressor Rectifier Smoothing capacitor Inverter Noise filter AC 460V Fuse Terminal block for...
  • Page 351 [ IX Troubleshooting ] [YHMU-A] (2) Troubleshooting transmission power circuit of heat source unit Check the voltage at the indoor/heat source transmission terminal block (TB3) of heat source unit. Check whether the transmission line is disconnected, DC 24 ~ 30 V check for contact failure, and repair the problem.

  • Page 352: Refrigerant Leak

    [ IX Troubleshooting ] [5] Refrigerant Leak 1. Leak spot: In the case of extension pipe for indoor unit (Cooling season)<PQHY> 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 liquid service valve (BV2) inside the heat source unit while the compressor is being stopped.
  • Page 353 [ IX Troubleshooting ] 2) Therefore, if the power source is turned off within 30 minutes, the lev remains fully closed and the refrigerant remains sealed. When only the power for the indoor unit is turned off, the indoor unit LEV turns from faintly open to fully closed. 3) In the cooling cycle, the section between "21S4b, c"...
  • Page 354 [ IX Troubleshooting ] 5. Leak spot: In the case of extension pipe for indoor unit (Cooling season)<PQRY> 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 heat source unit while the compressor is being stopped.
  • Page 355 [ IX Troubleshooting ] 7. Leak spot: In the case of extension pipe for indoor unit (Heating season)<PQRY> (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 heat source control board is ON. 2) Change the setting of the remote controller for all the indoor units to the heating mode.

  • Page 356: Compressor Replacement Instructions

    [ IX Troubleshooting ] [6] Compressor Replacement Instructions 1. Compressor Replacement Instructions Follow the procedures below (Steps 1 through 5) to remove the compressor components and replace the compressor. Reassemble them in the reverse order after replacing the compressor. 1. Remove the service panel (front panels). 2.
  • Page 357 [ IX Troubleshooting ] Pipe cover on the Wiring adjacent to Acoustic insulation water heat exchanger the compressor on the compressor Belt heater Thermal insulation on the accumulator Remove the insulation material and the belt heater First, move the nearby wiring, insulation material on from the compressor.
  • Page 358 [ IX Troubleshooting ] 1. Water heat exchanger assembly and check valve (CV8) replacement instructions * The following describes the procedures for replacing the water heat exchanger assembly and check valve (CV8). 1. Applicable models • PQHY-P72, 96, 120YHMU-A • PQRY-P72, 96, 120YHMU-A 2.
  • Page 359 [ IX Troubleshooting ] 2) Disconnect all wires inside the control box, and remove the control box. 1) Remove the service panel and the water pipe inlet/outlet panel. 3) Remove Frame M under the control box. If the compressor is accessible by removing the rear service panel, it may facilitate compressor replacement. Remove the duct, solenoid valve block support, and INV heat exchanger support.
  • Page 360 [ IX Troubleshooting ] (2) Replacement procedures for check valve assembly ● Removing the check valve assembly Remove the check valve (CV8), elbow, and the pipe shown in the figure below at left by removing the brazing flux from the sections that are indicated with arrows. Check the shape of the water heat exchanger pipe end.
  • Page 361 [ IX Troubleshooting ] 2 Depending on the manufacturing period, the section of the pipe that is circled in the figure below at left (after the brazing flux is removed) comes in two types. If the pipe end looks like the one in the figure below in the middle (Pipe type A), cut off 36 mm of the pipe at the end.

  • Page 362: 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 363 [ 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.
  • Page 364 [ IX Troubleshooting ] 5. LEV Work procedure Explanatory figure (1) Remove the service panel.(Refer to 1. 1) - 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 365: Troubleshooting Using The Heat Source Unit Led Error Display

    [ IX Troubleshooting ] [8] Troubleshooting Using the Heat source 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.

  • Page 366: X Led Monitor Display On The Heat Source Unit Board

    X LED Monitor Display on the Heat source Unit Board [1] How to Read the LED on the Service Monitor ............... 359 HWE09080 - 357 -...
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  • Page 368: How To Read The Led On The Service Monitor

    [ X LED Monitor Display on the Heat source Unit Board ] X LED Monitor Display on the Heat source 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 369 [ X LED Monitor Display on the Heat source Unit Board ] 3. Time data storage function The heat source unit has a simple clock function that enables the unit to calculate the current time with an internal timer by receiving the time set by the system controller, such as G(B)-50A.
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