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Mitsubishi Electric PFAV-P250VM-E Service Manual
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Mitsubishi Electric PFAV-P250VM-E Service Manual

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  • Page 2: Safety Precautions

    Do not touch the heat exchanger fins. It may also be in violation of applicable laws. The fins are sharp and dangerous. MITSUBISHI ELECTRIC CORPORATION cannot be held responsible for malfunctions or accidents resulting from the In the event of a refrigerant leak, thoroughly ventilate use of the wrong type of refrigerant.
  • Page 3 WARNING Securely attach the terminal block cover (panel) to the After completing the service work, check for a gas unit. leak. If the terminal block cover (panel) is not installed properly, If leaked refrigerant is exposed to a heat source, such as a dust and/or water may infiltrate and pose a risk of electric fan heater, stove, or electric grill, poisonous gases may be shock, smoke, and/or fire.
  • Page 4 Precautions for handling units for use with R410A CAUTION Do not use the existing refrigerant piping. Use a vacuum pump with a reverse-flow check valve. A large amount of chlorine that may be contained in the re- If a vacuum pump that is not equipped with a reverse-flow sidual refrigerant and refrigerating machine oil in the exist- check valve is used, the vacuum pump oil may flow into the ing piping may cause the refrigerating machine oil in the...

  • 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: Electrical Work

    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 ........................6 [4] Storage of Piping ........................8 [5] Pipe Processing........................8 [6] Brazing............................9 [7] Air Tightness Test........................10 [8] Vacuum Drying (Evacuation) ....................
  • Page 9 XI LED Monitor Display on the Outdoor Unit Board [1] How to Read the LED on the Service Monitor ..............219 HWE10190...
  • Page 10 I Read Before Servicing [1] Read Before Servicing ....................... 3 [2] Necessary Tools and Materials..................4 [3] Piping Materials ......................... 6 [4] Storage of Piping ....................... 8 [5] Pipe Processing ......................... 8 [6] Brazing..........................9 [7] Air Tightness Test ......................10 [8] Vacuum Drying (Evacuation) ...................
  • Page 11 - 2 - HWE10190...

  • 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 PFAV series: R410A 2. Check the symptoms exhibited by the unit to be serviced. Refer to this service handbook for symptoms relating to the refrigerant cycle.

  • 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 [ I Read Before Servicing ] 4. Tools and materials that must not be used with R410A Tools/Materials Notes Charging Cylinder Refrigerant charging Prohibited to use Tools for R410A must be handled with special care to keep moisture and dust from infiltrating the cycle. Tools recommended for replacing parts for changing the indoor unit static air pressure When replacing a motor or pulley, work can be performed easier by using tools of dimensions close to the following specifi- cations.

  • Page 15: 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 16 [ 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 17: 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 18: 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 19: Air Tightness Test

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

  • Page 20: 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 21: Refrigerant Charging

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

  • Page 22: Characteristics Of The Conventional And The New Refrigerants

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

  • Page 23: Notes On Refrigerating Machine Oil

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

  • Page 24: Restrictions

    II Restrictions [1] System configuration ....................... 17 [2] Types and Maximum allowable Length of Cables ............17 [3] Switch Settings and Address Settings ................19 [4] Sample System Connection..................... 25 [5] An Example of a System to which an MA Remote Controller is connected..... 26 [6] Restrictions on Pipe Length .....................
  • Page 25 - 16 - HWE10190...

  • Page 26: System Configuration

    1. Unit combination The table below shows a list of outdoor units that are compatible with the indoor unit described in this manual. (1) Standard type combination Indoor unit model name Outdoor unit model name PFAV-P250VM-E PUHY-P250YJM-A PFAV-P500VM-E PUHY-P500YSJM-A PFAV-P750VM-E...
  • Page 27 [ II Restrictions ] 1) M-NET transmission line Facility All facility types type Type Shielded cable CVVS, CPEVS, MVVS Cable type Number of 2-core cable cores Cable size Larger than 1.25mm [AWG16] Maximum transmission line distance between the 200 m [656ft] max. outdoor unit and the far- thest indoor unit Maximum transmission...

  • Page 28: Switch Settings And Address Settings

    [ II Restrictions ] 2) Remote controller wiring MA remote controller Type Number of 2-core cable cores Cable type 0.3 to 1.25mm [AWG22 to 16] *2 Cable size (0.75 to 1.25mm [AWG18 to 16] *3 Maximum overall line 200 m [656ft] max. length *1 MA remote controller refers to MA remote controller (PAR-21MAA), MA simple remote controller, and wireless re- mote controller.
  • 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 Address setting Setting method Facto- range ry set- ting Indoor unit Main/sub unit...
  • Page 30 [ II Restrictions ] (2) Power supply switch connector connection on the outdoor unit (Factory setting: The male power supply switch connector is connected to CN41.) System configu- Connection to Power supply unit Group operation Power supply switch connector connection ration the system con- for transmission...
  • Page 31 [ II Restrictions ] (6) Miscellaneous settings Cooling-only setting for the indoor unit: Cooling only model (Factory setting: SW3-1 "OFF.") When using indoor unit as a cooling-only unit, set SW3-1 to ON. (7) Various types of control using input-output signal connector on the outdoor unit (various connection options) Terminal Type Usage...
  • Page 32 [ II Restrictions ] Example of wiring connection (1) CN51 (2) CN3S Outdoor unit Relay circuit Adapter 2 control board Distant control Relay circuit Adapter 1 board Outdoor unit CN3S control board CN51 Preparations in the field Maximum cable Preparations length is 10m Maximum cable in the field...
  • Page 33 [ II Restrictions ] 3. 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 outdoor units (OC and OS). Between 2 and 8 steps of demand control is possible by setting DIP SW4-4 on the outdoor units (OC and OS). Table.1 DipSW4-4 Demand control switch...

  • Page 34: Sample System Connection

    [ II Restrictions ] 3) 8-step demand control (When SW4-4 is set to ON on two outdoor 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: 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. Single-outdoor-unit system (manual IC/OC address setup) (1) Sample control cable wiring configuration Group TB15 M1 M2 S M1 M2 M1 M2 S MA (main body) Group TB15...
  • Page 36 [ II Restrictions ] 3) MA remote controller wiring (4) Wiring method Required when operation with two remote controllers or 1) Indoor-outdoor transmission cable group operation is performed. Daisy-chain terminals M1 and M2 of the terminal block When two remote controllers are connected to the for indoor-outdoor transmission cable (TB3) on the out- system door unit (OC) and of the terminal block for indoor-out-...
  • Page 37 [ II Restrictions ] 2. Single-refrigerant-circuit system (1) Sample control cable wiring configuration TB5-1 M1 M2 M1 M2 M1 M2 M1 M2 S M1 M2 S TB15 MA(Main) MA(Sub) * Applicable to the P750 and P900-F models. (2) Cautions (3) Maximum allowable length 1) Assign sequential addresses to the indoor unit.
  • Page 38 [ II Restrictions ] 3) MA remote controller wiring (4) Wiring method Required when operation with two remote controllers or 1) Indoor-outdoor transmission cable group operation is performed. Daisy-chain terminals M1 and M2 of the terminal block When two remote controllers are connected to the for indoor-outdoor transmission cable (TB3) on the out- system door units (OC and OS) (Note1) and of the terminal block...
  • Page 39 [ II Restrictions ] 3. Group operation of the indoor units connected to different outdoor units (1) Sample control cable wiring configuration Leave the power jumper Group as it is on CN41. TB15 M1 M2 M1 M2 M1 M2 MA (main body) Main Leave the power jumper as it is on CN41.
  • Page 40 [ II Restrictions ] When two remote controllers are connected to the (4) Wiring method system 1) Indoor-outdoor transmission cable Same as section [5] 1. Daisy-chain terminals M1 and M2 of the terminal block Group operation of indoor units for indoor-outdoor transmission cable (TB7) on the out- To perform a group operation of indoor units, connect the door unit (OC) and of the terminal block for indoor-out- terminals 1 and 2 of the terminal block (TB15) on the in-...
  • Page 41 [ II Restrictions ] 4. An example of a system in which a system controller is connected to the transmission cable for the centralized con- trol system and the power is supplied from the outdoor unit (1) Sample control cable wiring configuration Move the power jumper from CN41 to CN40.
  • Page 42 [ II Restrictions ] Shielded cable connection (4) Wiring method Daisy-chain the S terminals of the terminal block (TB7) 1) Indoor-outdoor transmission cable and of the system controller on the outdoor units with the Same as section [5] 2. shielded cable. Connect the S (shield) terminal of the ter- minal block (TB7) on the outdoor unit whose power jump- Shielded cable connection er was moved from CN41 to CN40 to the ground terminal...

  • Page 43: Restrictions On Pipe Length

    [ II Restrictions ] [6] Restrictions on Pipe Length P250 model Note1. If the A/C system is designed to use cooling mode under outdoor temperature 0°C, H’<=15m. Note2. As bents cause pressure loss on transportation of refrigerant, fewer bents design is better; Piping length needs to consider the actual length and equivalent length which bents are counted.
  • Page 44 [ II Restrictions ] P500 and P750 models Note1. If the A/C system is designed to use cooling mode under outdoor temperature 0°C, H’<=15m. Note2. As bents cause pressure loss on transportation of refrigerant, fewer bents design is better; Piping length needs to consider the actual length and equivalent length which bents are counted. Equivalent piping length (m)=Actual piping length+"M"...
  • Page 45 [ II Restrictions ] - 36 - HWE10190...

  • Page 46: Outdoor Unit Components

    III Outdoor Unit Components [1] Outdoor Unit Components and Refrigerant Circuit ............39 [2] Control Box of the Outdoor Unit..................41 [3] Outdoor Unit Circuit Board....................42 - 37 - HWE10190...
  • Page 47 - 38 - HWE10190...

  • Page 48: Outdoor Unit Components And Refrigerant Circuit

    [ III Outdoor Unit Components ] III Outdoor Unit Components [1] Outdoor Unit Components and Refrigerant Circuit 1. Outdoor unit components (1) PUHY-P250, P350, P400YJM-A Fan guard Control Control Control Heat exchanger Heat exchanger Heat exchanger Front panel Fin guard - 39 - HWE10190...
  • Page 49 [ III Outdoor Unit Components ] 2. Refrigerant circuit (1) PUHY-P250YJM-A Low-pressure sensor(63LS) High-pressure sensor(63HS1) Check valve High-pressure switch(63H1) 4-way valve(21S4b) Accumulator 4-way valve(21S4a) Low-pressure check joint High-pressure check joint Subcool coil Compressor cover Linear expansion valve (LEV2) Linear expansion valve Solenoid valve (SV1a) (LEV1) 2-way valve(SV5b)

  • Page 50: Control Box Of The Outdoor Unit

    [ III Outdoor Unit Components ] [2] Control Box of the Outdoor Unit <HIGH VOLTAGE WARNING> Control box houses high-voltage parts. When opening or closing the front panel of the control box, do not let it come into contact with any of the internal components.

  • Page 51: Outdoor Unit Circuit Board

    [ III Outdoor Unit Components ] [3] Outdoor Unit Circuit Board 1. Outdoor unit control board CN332 CNDC Serial communication signal input CN801 Output 18VDC Bus voltage input GND (INV board) Pressure switch Output 17VDC connection (Fan board) Serial communication signal output CNAC2 driving output LED1...
  • Page 52 [ III Outdoor Unit Components ] 2. M-NET board CNS2 CNIT Transmission line input/output for 12VDC input CN04 centralized control system CN102 Bus voltage input 5VDC input Power supply output for centralized control system Power supply detection output Indoor/outdoor transmission line input/output Power supply ON/OFF Grounding signal input...

  • Page 53: Inv Board

    [ III Outdoor Unit Components ] 3. INV board 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 GND(Fan Board) Serial communication signal output...

  • Page 54: Fan Board

    [ III Outdoor Unit Components ] 4. Fan board LED3 CN18V Lit during normal Input 18VDC Serial communication signal output CPU operation GND(Control board) Serial communication signal output CN21 Serial communication signal output GND(INV board) CNVDC Input 17VDC Bus voltage input CN22 GND(INV board) Input 5VDC...

  • Page 55: Noise Filter

    [ III Outdoor Unit Components ] 5. Noise Filter Output Output (Rectified L2-N current) (Rectified L2-N current) Surge absorber circuit Surge absorber circuit Short circuit Short circuit Grounding F1,F2,F3,F4 Fuse 250VAC 6.3A Output Grounding CN1A Input CN1B TB21 TB22 TB23 TB24 Input Input/output(L1)

  • Page 56: Indoor Unit Components

    IV Indoor Unit Components [1] External Dimensions ......................49 [2] Indoor Unit Components and Internal Structure .............. 55 [3] Control Box of the Indoor Unit..................57 [4] Indoor Unit Circuit Board....................58 [5] Fan........................... 59 - 47 - HWE10190...
  • Page 57 - 48 - HWE10190...

  • Page 58: External Dimensions

    [ IV Indoor Unit Components ] IV Indoor Unit Components [1] External Dimensions -1- Standard type 1. PFAV-P250VM-E Unit:mm - 49 - HWE10190...
  • Page 59 [ IV Indoor Unit Components ] 2. PFAV-P500VM-E Unit:mm - 50 - HWE10190...
  • Page 60 [ IV Indoor Unit Components ] 3. PFAV-P750VM-E Unit:mm - 51 - HWE10190...
  • Page 61 [ IV Indoor Unit Components ] -2- Fresh air intake type 1. PFAV-P300VM-E-F Unit:mm - 52 - HWE10190...
  • Page 62 [ IV Indoor Unit Components ] 2. PFAV-P600VM-E-F Unit:mm - 53 - HWE10190...
  • Page 63 [ IV Indoor Unit Components ] 3. PFAV-P900VM-E-F Unit:mm - 54 - HWE10190...

  • Page 64: Indoor Unit Components And Internal Structure

    [ IV Indoor Unit Components ] [2] Indoor Unit Components and Internal Structure WARNING Hold the front panel up when opening it. 1. PFAV-P250VM-E, PFAV-P300VM-E-F Outlet Material: Material: Hot-dip galvanized steel sheet Hot-dip galvanized steel sheet Siroccofan Rear panel Material:...
  • Page 65 [ IV Indoor Unit Components ] 3. PFAV-P750VM-E, PFAV-P900VM-E-F Front panel (upper) Fan motor Material: Pulley Heat exchanger Material: Alloyed hot-dip Material: Material: Hot-dip galvanized Material: galvanized steel Hot-rolled mild steel Gray cast iron steel sheet Coil phosphorus deoxidized sheet sheet copper Scroll dumper...

  • Page 66: Control Box Of The Indoor Unit

    [ IV Indoor Unit Components ] [3] Control Box of the Indoor Unit 1. PFAV-P250, P500VM-E, PFAV-P300, P600VM-E-F Terminal block for transmission line connection TB5 Auxiliary relay 52F Circuit board Auxiliary relay X4 Terminal block for remote controller TB15 CN90 CN3A CN28 2次側...

  • Page 67: Indoor Unit Circuit Board

    [ IV Indoor Unit Components ] [4] Indoor Unit Circuit Board 1. Indoor unit control board CN3A CN33 CN28 MA remote controller Defrost output Fan error input CN93 transmission cable Wireless remote controller CN90 Steam hot Power output transmission cable Power input water CN60, CN7V...

  • Page 68: Fan

    2% including the initial stretching Model frequency force deflection of the belt (approximately 1%). (After approximately 5,000 50Hz 18.0N 6.9mm hours of operation.) PFAV-P250VM-E 60Hz 15.9N 6.8mm 3. Tools 50Hz 28.9N 3.6mm PFAV-P500VM-E When loosening the securing bolts of the electric motor 60Hz 24.9N...
  • Page 69 [ IV Indoor Unit Components ] - 60 - HWE10190...

  • Page 70: Remote Controller

    V Remote Controller [1] Functions and Specifications of MA Remote Controller........... 63 [2] Using the built-in Temperature Sensor on the Remote Controller ........63 - 61 - HWE10190...
  • Page 71 - 62 - HWE10190...

  • Page 72: Functions And Specifications Of Ma Remote Controller

    [ V Remote Controller ] V Remote Controller [1] Functions and Specifications of MA Remote Controller 1. Functions/Specifications Functions/Specifications MA remote controller Remote controller address setting Not required indoor-outdoor unit address setting Required Wiring method Non-polarized two-wire ∗To perform a group operation, daisy-chain the indoor units using non-polarized two- wire cables.
  • Page 73 [ V Remote Controller ] - 64 - HWE10190...

  • Page 74: Electrical Wiring Diagram

    VI Electrical Wiring Diagram [1] Electrical Wiring Diagram of the Outdoor Unit ..............67 [2] Electrical Wiring Diagram of the Indoor Unit ..............68 [3] Electrical Wiring Diagram of Transmission Booster............72 - 65 - HWE10190...
  • Page 75 - 66 - HWE10190...

  • Page 76: Electrical Wiring Diagram Of The Outdoor Unit

    [ VI Electrical Wiring Diagram ] VI Electrical Wiring Diagram [1] Electrical Wiring Diagram of the Outdoor Unit 1. Electrical wiring diagram of the outdoor unit (1) PUHY-P250, 350, 400YJM-A - 67 - HWE10190...

  • Page 77: Electrical Wiring Diagram Of The Indoor Unit

    [ VI Electrical Wiring Diagram ] [2] Electrical Wiring Diagram of the Indoor Unit -1- Standard type 1. PFAV-P250, P500VM-E - 68 - HWE10190...
  • Page 78 [ VI Electrical Wiring Diagram ] 2. PFAV-P750VM-E - 69 - HWE10190...
  • Page 79 [ VI Electrical Wiring Diagram ] -2- Fresh air intake type 1. PFAV-P300, P600VM-E-F - 70 - HWE10190...
  • Page 80 [ VI Electrical Wiring Diagram ] 2. PFAV-P900VM-E-F - 71 - HWE10190...

  • Page 81: Electrical Wiring Diagram Of Transmission Booster

    [ VI 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 220 - 240VAC Varistor Noise filter Black White White White White Varistor Green Black Stabilized power supply...

  • Page 82: Refrigerant Circuit

    VII Refrigerant Circuit [1] Refrigerant Circuit Diagram ..................... 75 [2] Principal Parts and Functions ..................78 - 73 - HWE10190...
  • Page 83 - 74 - HWE10190...

  • Page 84: Refrigerant Circuit Diagram

    [ VII Refrigerant Circuit ] VII Refrigerant Circuit [1] Refrigerant Circuit Diagram 1. Outdoor unit (1) PUHY-P250YJM-A 21S4b 21S4a 63H1 63HS1 SV1a 63LS COMP SV5b LEV2 LEV1 SCC (HIC Circuit) (2) PUHY-P350 and P400YJM-A 21S4c 21S4b 21S4a 63H1 63HS1 SV1a 63LS COMP SV5c...
  • Page 85 [ VII Refrigerant Circuit ] 2. Indoor unit (1) PFAV-P250VM-E, PFAV-P300VM-E-F Thermistor TH4 <Refrigerant flow> <Outdoor unit inlet temperature detection> Cooling Thermistor TH3 Heating <Gas pipe temperature detection> Gas pipe Brazed connection Distributor Liquid pipe Brazed connection Heat exchanger Thermistor TH1 Thermistor TH2 <Room temperature/Supply air...
  • Page 86 [ VII Refrigerant Circuit ] (3) PFAV-P750VM-E, PFAV-P900VM-E-F Thermistor TH3 (No.1) <Refrigerant flow> <Detection of heat exchanger Thermistor TH2 (No.1) Cooling gas pipe temperature> <Detection of heat exchanger Heating liquid pipe temperature> Distributor Linear expansion valve Gas pipe Brazed connection Liquid pipe Brazed connection Thermistor TH3 (No.2)

  • Page 87: Principal Parts And Functions

    [ VII Refrigerant Circuit ] [2] Principal Parts and Functions 1. Outdoor unit Part Symbols Notes Usage Specifications Check method name (functions) Com- Adjusts the amount of circulating 250 model pressor (Comp1) refrigerant by adjusting the operat- Low-pressure shell scroll ing frequency based on the oper- compressor wirewound resis- ating pressure data...
  • Page 88 [ VII Refrigerant Circuit ] Part Symbols Notes Usage Specifications Check method name (functions) Thermis- 1) Detects discharge air temper- Degrees Celsius Resistance (Discharge) check ature = 7.465k = 4057 2) Provides high-pressure pro- 25/120 tection 7.465 4057 0°C[32°F] :698kΩ 10°C[50°F] :413kΩ...
  • Page 89 [ VII Refrigerant Circuit ] Part Symbols Notes Usage Specifications Check method name (functions) Linear LEV1 Adjusts the amount of bypass flow DC12V Same as in- expan- (SC control) from the liquid pipe on the outdoor Opening of a valve driven by a door LEV sion unit during cooling...
  • Page 90 [ VII 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 91 [ VII Refrigerant Circuit ] - 82 - HWE10190...

  • Page 92: Control

    VIII Control [1] Functions and Factory Settings of the Dipswitches ............85 [2] Controlling the Outdoor Unit .................... 92 [3] Operation Flow Chart..................... 102 - 83 - HWE10190...
  • Page 93 - 84 - HWE10190...

  • Page 94: Functions And Factory Settings Of The Dipswitches

    [ VIII Control ] VIII Control [1] Functions and Factory Settings of the Dipswitches 1. Outdoor unit (1) Control board Units that re- quire switch Function according to switch setting Switch setting timing setting Switch Function Note.2 Unit address setting Set to 00 or 51-100 with the dial switch Before power on For self-diagnosis/...
  • Page 95 [ VIII 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 96 [ VIII Control ] Units that re- quire switch Function according to switch setting Switch setting timing setting Switch Function Note.2 Model selection See the table below (Note 4) Before being energized Low-noise mode Capacity priority Low-noise mode Before being energized selection mode (Note 3) Model selection...
  • Page 97 [ VIII Control ] 2. Function of the switch (Indoor unit) (1) Dipswitches (Standard type) 1) SW1,3, 7, 8 Switch setting Function according to switch setting timing Switch Function Notes Room temperature de- Built-in sensor on the re- Indoor unit return air tection position mote controller Filter sign...
  • Page 98 [ VIII Control ] 2) SW2,SW3-2,SW3-9,SW3-10,SW4 <Notes on capacity code and model settings> Model System Capacity SW3-2 SW3-9 SW3-10 If the capacity code or model setting has been incorrectly P250 − set (e.g., when replacing the circuit board), both the indoor and outdoor units need to be power reset.
  • Page 99 [ VIII Control ] (2) Dipswitches (Fresh Air Intake type) 1) SW1,3,7,8 Switch setting Function according to switch setting timing Switch Function Notes Room temperature detec- Built-in sensor on the re- Indoor unit return air tion position mote controller Filter sign 100h 1 2 5 0 h N / A...
  • Page 100 [ VIII Control ] Fan operation on the Fresh Air Intake type units When the return air dry temperature is 5°C [41°F] or below, units may be forced to operate in the heating mode to prevent humidifier from freezing up and to prevent cold drafts. The fan will stop when all refrigerant systems are in trouble and during the defrost cycle.

  • Page 101: Controlling The Outdoor Unit

    [ VIII Control ] [2] Controlling the Outdoor Unit -1- Outline of Control Method The outdoor units are designated as OC and OS in the order of capacity from large to small (if two or more units have the same capacity, in the order of address from small to large). The setting of outdoor unit can be verified by using the self-diagnosis switch (SW1).
  • Page 102 [ VIII 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), (SV9) (ON = Open) SV1a Operation When starting-up the compressor of each ON for 4 minutes.
  • Page 103 [ VIII Control ] -6- Compressor Frequency Control Depending on the capacity required, the frequency of the compressor is controlled by changing the target evaporation tem- perature during cooling operation and the target condensing temperature during heating operation. The table below summarizes the operating frequency ranges of the inverter compressor during normal operation. The OS in the multiple-outdoor-unit system operates at the actual compressor frequency value that is calculated by the OS based on the preliminary compressor frequency value that the OC determines.

  • Page 104: Defrost Operation Control

    [ VIII Control ] -7- Defrost Operation Control (1) Starting the defrost operation The defrost cycle starts when the pipe temperature (TH3), in the following table, or below has continuously been detected for 3 minutes after the integrated compressor operation time of 50 minutes have passed (90 minutes when the defrost prohibit timer is set to 90 minutes).

  • Page 105: Refrigerant Recovery Control

    [ VIII Control ] (3) Stopping the defrost operation The defrost cycle ends when 12 minutes have passed since the beginning of the cycle, or when the pipe temperature (TH3), in the following table, or above has been continuously detected for 4 minutes (when SW3-4 is set to OFF) or 2 minutes (when SW3-4 is set to ON) that exceeds the values in the table below.
  • Page 106 [ VIII Control ] -9- Capacity Control of Outdoor Fan (1) Control method Depending on the capacity required, the rotation speed of the outdoor unit fan is controlled by the inverter to keep a constant condensing temperature during cooling operation and a constant evaporation temperature during heating operation. The OS in the multiple-outdoor-unit system operates at the actual outdoor unit fan control value that is calculated by the OS based on the preliminary outdoor unit fan control value that the OC determines.
  • Page 107 [ VIII Control ] (2) Outdoor unit P500 and P750 models Initial startup mode starts. The compressor on the OC starts up. 60Hz The air conditioning load is large enough to require a simultaneous operation of OC and OS. The compressor on the OC starts up. The compressor on the OC remains in operation, and the compressor on the OS starts up.
  • Page 108 [ VIII Control ] -13- Emergency Operation Mode 1. Problems with the outdoor unit Emergency operation mode is a temporary operation mode in which the outdoor unit that is not in trouble operates when one of the outdoor units in the P500 or P750 model is in trouble. This mode can be started by performing an error reset via the remote controller.
  • Page 109 [ VIII Control ] 2. Communication circuit failure or when some of the outdoor units are turned off This is a temporary operation mode in which the outdoor unit that is not in trouble operates when communication circuit failure occurs or when some of the outdoor units are turned off. (1) Starting the emergency operation (When the OC is in trouble) 1) When an error occurs, the error source and the error code appear on the display on the remote controller.
  • Page 110 [ VIII Control ] -15- DEMAND Control Cooling/heating operation can be prohibited (Thermo-OFF) by an external input to the indoor units. When DIP SW4-4 is set to ON, the 4-step DEMAND control is enabled. Eight-step demand control is possible in the system with two outdoor units. Refer to Chapter II [3] 2.

  • Page 111: Operation Flow Chart

    [ VIII Control ] [3] Operation Flow Chart 1. Mode determination flowchart (1) Indoor unit (cooling, heating and fan modes) Start Normal operation Error Breaker Unit in the stopped state turned on From outdoor unit Operation SW turned on 1. Protection function self-holding cancelled.
  • Page 112 [ VIII Control ] (2) Outdoor unit (cooling and heating modes) Start Normal operation Error Breaker Unit in the stopped state turned on "PLEASE WAIT" blinks on the remote controller. *Note 1 Indoor units registered to the remote controller From indoor unit Operation command 1.
  • Page 113 [ VIII 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 operation Test run mode Thermo-ON 3-minute restart delay 1. Inverter output 0Hz 1.
  • Page 114 [ VIII Control ] (2) Heating operation Normal operation Defrost operation Heating operation Unit in the stopped state *Note 1,2 During test run mode Defrost operation 4-way valve ON 4-way valve OFF 1. Indoor unit fan stops 2. Inverter defrost frequency control Test run mode 3.
  • Page 115 [ VIII Control ] - 106 - HWE10190...

  • Page 116: Test Run Mode

    IX Test Run Mode [1] Items to be checked before a Test Run ................. 109 [2] Test Run Method ......................110 [3] Operating Characteristic and Refrigerant Amount ............111 [4] Adjusting the Refrigerant Amount .................. 111 [5] Refrigerant Amount Adjust Mode................... 114 [6] The following symptoms are normal.
  • Page 117 - 108 - HWE10190...

  • Page 118: Items To Be Checked Before A Test Run

    [ IX Test Run Mode ] IX 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 119: Test Run Method

    [ IX 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 120: Operating Characteristic And Refrigerant Amount

    [ IX 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 121 [ IX Test Run Mode ] 3. Amount of refrigerant to be added The amount of refrigerant that is shown in the table below is factory-charged to the outdoor units. The amount necessary for extended pipe (field piping) is not included and must be added on site. Outdoor unit model P250 P350...
  • Page 122 [ IX Test Run Mode ] (2) Example: PUHY-P500YSHM-A 9.52 9.52 (3 m) (1 m) P600-F Liquid separator 15.88 (30 m) [3/8"] [3/8"] [9 ft] [3 ft] P600-F Liquid separator [3/4"][98 ft] (3) Sample calculation All the pipes in the figure are liquid pipes. 15.88 : 30 m = 30 m 9.52 : 3 m + 1m = 4 m According to the above formula...

  • Page 123: Refrigerant Amount Adjust Mode

    [ IX Test Run Mode ] [5] Refrigerant Amount Adjust Mode 1. Procedures Follow the procedures below to add or extract refrigerant as necessary depending on the operation mode. When the function switch (SW4-3) on the main board on the outdoor unit (OC only) is turned to ON, the unit goes into the refrigerant amount adjust mode, and the following sequence is followed.
  • Page 124 [ IX 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 125: The Following Symptoms Are Normal

    [ IX Test Run Mode ] [6] The following symptoms are normal. Remote controller Symptoms Cause display The fan stops during heating The fan remains stopped during defrost operation. Defrost operation. The fan keeps running after When the auxiliary heater is turned on, the fan operates for one minute Unlit the unit has stopped.

  • Page 126: Standard Operation Data (Reference Data)

    [ IX Test Run Mode ] [7] Standard Operation Data (Reference Data) 1. Single unit (1) Cooling operation Indoor unit PFAV-P250VM-E PFAV-P300VM-E-F model Specifications Outdoor unit PUHY-P250YJM-A PUHY-P250YJM-A model 27°C/19°C 33°C/28°C Ambient Indoor [81°F/66°F] [91°F/82°F] tempera- DB/WB ture Outdoor 35°C/- [95°F/-] 33°C/- [91°F/-]...
  • Page 127 [ IX Test Run Mode ] (2) Heating operation Indoor unit PFAV-P250VM-E PFAV-P300VM-E-F model Specifications Outdoor unit PUHY-P250YJM-A PUHY-P250YJM-A model Ambient Indoor 20°C/- [68°F/-] 7°C/- [45°F/-] tempera- DB/WB Outdoor 7°C/6°C [45°F/43°F] 7°C/3°C [45°F/37°F] ture Operating conditions Piping Main pipe m[ft] 7.5 [24-1/4]...
  • Page 128 [ IX Test Run Mode ] 2. 2-unit combination (1) Cooling operation Indoor unit PFAV-P500VM-E model Specifications PUHY-P500YSJM-A Outdoor unit model PUHY-P250YJM-A PUHY-P250YJM-A Ambient Indoor 27°C/19°C [81°F/66°F] tempera- DB/WB Outdoor 35°C/- [95°F/-] ture Operating conditions Piping Main pipe m[ft] 7.5 [24-1/4] Refrigerant charge 22.5 [49-10] [lbs-oz]...
  • Page 129 [ IX Test Run Mode ] Indoor unit PFAV-P600VM-E-F model Specifications PUHY-P500YSJM-A Outdoor unit model PUHY-P250YJM-A PUHY-P250YJM-A Ambient Indoor 33°C/28°C [91°F/82°F] tempera- DB/WB Outdoor 33°C/- [91°F/-] ture Operating conditions Piping Main pipe m[ft] 7.5 [24-1/4] Refrigerant charge 22.5 [49-10] [lbs-oz] Electric current 23.8 Outdoor...
  • Page 130 [ IX Test Run Mode ] Indoor unit PFAV-P750VM-E model Specifications PUHY-P750YSJM-A Outdoor unit model PUHY-P400YJM-A PUHY-P350YJM-A Ambient Indoor 27°C/19°C [81°F/66°F] tempera- DB/WB Outdoor 35°C/- [95°F/-] ture Operating conditions Piping Main pipe m[ft] 7.5 [24-1/4] Refrigerant charge 33.2 [73-3] [lbs-oz] Electric current 40.2 Outdoor...
  • Page 131 [ IX Test Run Mode ] Indoor unit PFAV-P900VM-E-F model Specifications PUHY-P750YSJM-A Outdoor unit model PUHY-P400YJM-A PUHY-P350YJM-A Ambient Indoor 33°C/28°C [91°F/82°F] tempera- DB/WB Outdoor 33°C/- [91°F/-] ture Operating conditions Piping Main pipe m[ft] 7.5 [24-1/4] Refrigerant charge 33.2 [73-3] [lbs-oz] Electric current 37.8 Outdoor...
  • Page 132 [ IX Test Run Mode ] (2) Heating operation Indoor unit PFAV-P500VM-E model Specifications PUHY-P500YSJM-A Outdoor unit model PUHY-P250YJM-A PUHY-P250YJM-A Ambient Indoor 20°C/- [68°F/-] tempera- DB/WB Outdoor 7°C/6°C [45°F/43°F] ture Operating conditions Piping Main pipe m[ft] 7.5 [24-1/4] Refrigerant charge 22.5 [49-10] [lbs-oz] Electric current...
  • Page 133 [ IX Test Run Mode ] Indoor unit PFAV-P600VM-E-F model Specifications PUHY-P500YSJM-A Outdoor unit model PUHY-P250YJM-A PUHY-P250YJM-A Ambient Indoor 7°C/- [45°F/-] tempera- DB/WB Outdoor 7°C/3°C [45°F/37°F] ture Operating conditions Piping Main pipe m[ft] 7.5 [24-1/4] Refrigerant charge 22.5 [49-10] [lbs-oz] Electric current 27.0 Outdoor...
  • Page 134 [ IX Test Run Mode ] Indoor unit PFAV-P750VM-E model Specifications PUHY-P750YSJM-A Outdoor unit model PUHY-P400YJM-A PUHY-P350YJM-A Ambient Indoor 20°C/- [68°F/-] tempera- DB/WB Outdoor 7°C/6°C [45°F/43°F] ture Operating conditions Piping Main pipe m[ft] 7.5 [24-1/4] Refrigerant charge 33.2 [73-3] [lbs-oz] Electric current 40.8 Outdoor...
  • Page 135 [ IX Test Run Mode ] Indoor unit PFAV-P900VM-E-F model Specifications PUHY-P750YSJM-A Outdoor unit model PUHY-P400YJM-A PUHY-P350YJM-A Ambient Indoor 7°C/- [45°F/-] tempera- DB/WB Outdoor 7°C/3°C [45°F/37°F] ture Operating conditions Piping Main pipe m[ft] 7.5 [24-1/4] Refrigerant charge 33.2 [73-3] [lbs-oz] Electric current 41.7 Outdoor...

  • Page 136: Troubleshooting

    X Troubleshooting [1] Error Code Lists ......................129 [2] Responding to Error Display on the Remote Controller..........132 [3] Investigation of Transmission Wave Shape/Noise............189 [4] Troubleshooting Principal Parts ..................192 [5] Refrigerant Leak ......................211 [6] Compressor Replacement Instructions................213 [7] Troubleshooting Using the Outdoor Unit LED Error Display..........
  • Page 137 - 128 - HWE10190...

  • Page 138: Error Code Lists

    [ X Troubleshooting ] X Troubleshooting [1] Error Code Lists Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code 4300 0403 Serial communication error 4305 (Note) 0900 Test run 1102 1202 Discharge temperature fault 1301 Low pressure fault 1302...
  • Page 139 [ X Troubleshooting ] Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code Detectable Outside temperature only by the All- (TH24) Fresh type in- Temperature sensor 5104 1202 door units fault Outdoor unit discharge temperature (TH4) Temperature sensor Accumulator inlet tempera-...
  • Page 140 [ X Troubleshooting ] Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code 7111 Remote controller sensor fault 7113 Function setting error 7117 Model setting error 7130 Incompatible unit combination The last digit in the check error codes in the 4000's and 5000's and two-digit detail codes indicate if the codes apply to com- pressor inverter on fan inverter.

  • Page 141: Responding To Error Display On The Remote Controller

    [ X 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, and between the control board and the Fan board Detail code 01: Between the control board and the INV board Detail code 05: Between the control board and the Fan board...
  • Page 142 [ X Troubleshooting ] 1. Error Code 1102 Discharge temperature fault 2. Error definition and error detection method 1) If the discharge temperature of 120 °C [248°F] or more is detected during the above operation (the first detection), the outdoor unit stops once, turns to anti-restart mode for 3 minutes, and restarts after 3 minutes automatically.
  • Page 143 [ X 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 144 [ X Troubleshooting ] 1. Error Code 1302 High pressure fault 1 (Outdoor unit) 2. Error definition and error detection method 1) If the pressure of 3.78MPa [548psi] or higher is detected by the pressure sensor during operation (the first detection), the out- door stops once, turns to antirestart mode for 3 minutes, and restarts after 3 minutes automatically.
  • Page 145 [ X Troubleshooting ] 1. Error Code 1302 High pressure fault 2 (Outdoor unit) 2. Error definition and error detection method If the pressure of 0.098MPa [14psi] or lower is registered on the pressure sensor immediately before start-up, it will trigger an abnormal stop, and error code "1302"...
  • Page 146 [ X Troubleshooting ] 1. Error Code 3121 Out-of-range outside air temperature 2. Error definition and error detection method When the thermistor temperature of -28°C[-18°F] or below has continuously been detected for 3 minutes during heating op- eration (during compressor operation), the unit makes an error stop and "3121" appears on the display. (Use the OC therm- istor temperature to determine when two outdoor units are in operation.) The compressor restarts when the thermistor temperature is -26°C[-15°F] or above (both OC and OS) during error stop.
  • Page 147 [ X Troubleshooting ] 1. Error Code 4102 Open phase 2. Error definition and error detection method An open phase of the power supply (L1 phase, N phase) was detected at power on. The L3 phase current is outside of the specified range. The open phase of the power supply may not always be detected if a power voltage from another circuit is applied.
  • Page 148 [ X Troubleshooting ] 1. Error Code 4106 <Transmission power supply fault Error detail code FF (Outdoor unit)> 2. Error definition and error detection method Transmission power output failure 3. Cause 1) Wiring failure 2) Transmission power supply cannot output voltage because overcurrent was detected. 3) Voltage cannot be output due to transmission power supply problem.
  • Page 149 [ X Troubleshooting ] 1. Error code 4109 Fan fault (indoor unit) 2. Error definition and error detection method If the auxiliary relay X4 (fan fault detection) remains unexcited for a certain amount of time during operation, the unit will come to an abnormal stop.
  • Page 150 [ X Troubleshooting ] 1. Error Code 4220 4225 Abnormal bus voltage drop (Detail code 108) 2. Error definition and error detection method If Vdc 289V or less is detected during Inverter operation. (S/W detection) 3. Cause, check method and remedy (1) Power supply environment Check whether the unit makes an instantaneous stop when the detection result is abnormal or a power failure occurs.
  • Page 151 [ X Troubleshooting ] 1. Error Code 4220 4225 Abnormal bus voltage rise (Detail code 109) 2. Error definition and error detection method If Vdc 830V 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 152 [ X Troubleshooting ] 1. Error Code 4220 4225 Low bus voltage at startup (Detail code 131) 2. Error definition and error detection method When Vdc 160 V is detected just before the inverter operation. 3. Cause, check method and remedy (1) Inverter main circuit failure Same as detail code 108 of 4220 error Refer to section -6- "Inverter"...
  • Page 153 [ X Troubleshooting ] 1. Error code 4240 Overload protection 2. Error definition and error detection method The output current (lac) below Imax (Arms) or THHS value above 100°C [212°F] is detected for 10 minutes continuously dur- ing inverter operation Model Imax(Arms) P250 model...
  • Page 154 [ X Troubleshooting ] 1. Error code 4250 Instantaneous overcurrent (Detail code 106) Overcurrent (Detail code 107) 2. Error definition and error detection method P250 model A current that equals or exceeds 94 Apeak or 22 Arms was detected by the current sensor. P350 and P400 models A current that equals or exceeds 94 Apeak or 35 Arms was detected by the current sensor.
  • Page 155 [ X Troubleshooting ] 1. Error Code 4250 4255 Overcurrent error due to short-circuited motor (Detail code 105) 2. Error definition and error detection method When a short is detected on the load side just before starting the inverter operation. 3.
  • Page 156 [ X Troubleshooting ] 1. Error Code 5101 Return air temperature sensor (TH21) fault (Indoor unit) 5102 Pipe temperature sensor (TH22) fault (Indoor unit) 5103 Gas-side pipe temperature sensor (TH23) fault (Indoor unit) 5104 Intake air temperature sensor (TH24) fault (Fresh Air intake type indoor unit) 2.
  • Page 157 [ X Troubleshooting ] 1. Error Code 5102 HIC bypass circuit outlet temperature sensor (TH2) fault (Outdoor unit) 5103 Heat exchanger outlet temperature sensor (TH3) fault (Outdoor unit) 5104 Discharge temperature sensor (TH4) fault (Outdoor unit) 5105 Accumulator inlet temperature sensor (TH5) fault (Outdoor unit) 5106 HIC circuit outlet temperature sensor (TH6) fault (Outdoor unit) 5107...
  • Page 158 [ X 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 159 [ X Troubleshooting ] 1. Error Code 5301 ACCT sensor fault (Detail code 115) 2. Error definition and error detection method When the formula "output current < 1.5 Arms" remains satisfied for 10 seconds while the inverter is in operation. 3.
  • Page 160 [ X 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 161 [ X Troubleshooting ] 1. Error Code 6201 Remote controller board fault (nonvolatile memory error) 2. Error definition and error detection method This error is detected when the data cannot be read out from the built-in nonvolatile memory on the remote controller. 3.
  • Page 162 [ X Troubleshooting ] 1. Error Code 6600 Address overlap 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 163: Error Code

    [ X 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 164 [ X Troubleshooting ] 1. Error Code 6603 Transmission line bus busy error 2. Error definition and error detection method Generated error when the command cannot be transmitted for 4-10 minutes in a row due to bus-busy Generated error when the command cannot be transmitted to the transmission line for 4-10 minutes in a row due to noise The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
  • Page 165 [ X 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 166 [ X 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 167 [ X 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 168 [ X 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 169 [ X 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 170 [ X 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 171 [ X 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 172 [ X 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 173 [ X Troubleshooting ] 1. Error Code 6608 No response error 2. Error definition and error detection method When no response command is returned although acknowledgement (ACK) is received after transmission, an error is detect- When the data is transmitted 10 times in a row with 3 seconds interval, an error is detected on the transmission side. The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
  • Page 174 [ X Troubleshooting ] 1. Error Code 6831 MA controller signal reception error (No signal reception) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. No proper data has been received for 3 minutes. 3.
  • Page 175 [ X Troubleshooting ] 1. Error Code 6832 MA remote controller signal transmission error (Synchronization error) 2. Error definition and error detection method MA remote controller and the indoor unit is not done properly. Failure to detect opening in the transmission path and unable to send signals ∗Indoor unit : 3 minutes ∗Remote controller : 6 seconds 3.
  • Page 176 [ X Troubleshooting ] 1. Error Code 6833 MA remote controller signal transmission error (Hardware error) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. An error occurs when the transmitted data and the received data differ for 30 times in a row. 3.
  • Page 177 [ X Troubleshooting ] 1. Error Code 6834 MA controller signal reception error (Start bit detection error) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. No proper data has been received for 2 minutes. 3.
  • Page 178 [ X Troubleshooting ] 1. Error Code 7100 Total capacity error 2. Error definition and error detection method The model total of indoor units in the system with one outdoor unit exceeds limitations. 3. Error source, cause, check method and remedy Error source Cause Check method and remedy...
  • Page 179 [ X Troubleshooting ] 1. Error Code 7101 Capacity code setting error 2. Error definition and error detection method Connection of incompatible (wrong capacity code or Qj) indoor unit or outdoor unit 3. Error source, cause, check method and remedy Error source Cause Check method and remedy...
  • Page 180 [ X Troubleshooting ] 1. Error Code 7102 Wrong number of connected units 2. Error definition and error detection method The number of connected units is "0" or exceeds the allowable value. 3. Error source, cause, check method and remedy Error source Cause Check method and remedy...
  • Page 181 [ X Troubleshooting ] 1. Error Code 7110 Connection information signal transmission/reception error 2. Error definition and error detection method The given indoor unit is inoperable because it is not properly connected to the outdoor unit in the same system. 3.
  • Page 182 [ X Troubleshooting ] 1. Error Code 7113 Function setting error (incorrect resistor connection) 2. Error source, cause, check method and remedy Error source Cause Check method and remedy Outdoor unit Wiring fault (Detail code 15) Loose connectors, short-circuit, con- Check the connector CNTYP5 on the control board for tact failure proper connection.
  • Page 183 [ X Troubleshooting ] 1. Error Code 7117 Model setting error 2. Error source, cause, check method and remedy Error source Cause Check method and remedy Outdoor unit Wiring fault (Detail code 15) Loose connectors, short-circuit, con- Check the connector CNTYP5 on the control board for tact failure proper connection.
  • Page 184 [ X Troubleshooting ] 1. Error Code 7130 Incompatible unit combination 2. Error definition and error detection method The check code will appear when the indoor units with different refrigerant systems are connected. 3. Error source, cause, check method and remedy Error source Cause Check method and remedy...
  • Page 185 [ X 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 186 [ X Troubleshooting ] In the case of MA remote controller 2. Phenomena When the remote controller operation SW is turned on, the operation status briefly appears on the display, then it goes off, and the display lights out immediately, and the unit stops. (1) Cause 1) The power for the M-NET transmission line is not supplied from the outdoor unit.
  • Page 187 [ X Troubleshooting ] In the case of MA remote controller 3. Phenomena "PLEASE WAIT" display on the remote controller does not disappear, and no operation is performed even if the button is pressed. ("PLEASE WAIT" display will normally turn off 5 minutes after the power on.) (1) Cause 1) The power for the M-NET transmission line is not supplied from the outdoor unit.
  • Page 188 [ X Troubleshooting ] Flow chart Even if the operation button on the remote controller is pressed, the indoor and the outdoor units do not start running. - 179 - HWE10190...
  • Page 189 [ X 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 outdoor unit.
  • Page 190 [ X 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. The main power of the indoor unit (AC220V) is not on.
  • Page 191 [ X Troubleshooting ] In case of ME remote controller 3. Phenomena "PLEASE WAIT" display on the remote controller does not disappear, and no operation is performed even if the button is pressed. (1) Cause Without using MELANS 1) Outdoor unit address is set to "00" 2) A wrong address is set.
  • Page 192 [ X 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 193 [ X 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 194 [ X 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 195 [ X Troubleshooting ] 2. Phenomena Although heating operation starts with the normal remote controller display, the capacity is not enough. (1) Cause, check method and remedy Cause Check method and remedy Compressor frequency does not rise sufficiently. Check pressure difference between the detected pressure by the pressure sensor and the actual Faulty detection of pressure sensor.
  • Page 196 [ X Troubleshooting ] Cause Check method and remedy Indoor unit LEV malfunction Refer to the page of LEV troubleshooting ([4] -5- Insufficient refrigerant flows due to LEV malfunction ).(page 196) (not enough opening). Temperature reading error on the indoor unit piping Check the thermistor.
  • Page 197 [ X Troubleshooting ] 3. Phenomena Outdoor unit stops at times during operation. (1) Cause, check method and remedy Cause Check method and remedy The first stop is not considered as an error, as the Check the mode operated in the past by displaying unit turns to anti-restart mode for 3 minutes as a pre- preliminary error history on LED display with SW1.

  • Page 198: Investigation Of Transmission Wave Shape/Noise

    [ X Troubleshooting ] [3] Investigation of Transmission Wave Shape/Noise 1. M-NET transmission Control is performed by exchanging signals between the outdoor unit and the indoor unit (ME remote controller) through M- NET transmission. Noise interference on the transmission line will interrupt the normal transmission, leading to erroneous op- eration.
  • Page 199 [ X 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 200 [ X 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 201: Troubleshooting Principal Parts

    [ X Troubleshooting ] [4] Troubleshooting Principal Parts -1- High-Pressure Sensor (63HS1) 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 202 [ X 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 203 [ X 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 204 [ X Troubleshooting ] (3) In case of SV1a (Bypass valve) This solenoid valve opens when powered (Relay ON). 1) At compressor start-up, the SV1a turns on for 4 minutes, and the operation can be checked by the self-diagnosis LED display and the closing sound.
  • Page 205 [ X Troubleshooting ] -5- LEV LEV operation LEV (Indoor unit: Linear expansion valve) and LEV2 (Outdoor unit: Linear expansion valve) are stepping-motor-driven valves that operate by receiving the pulse signals from the indoor and outdoor unit control boards. (1) Indoor LEV and Outdoor LEV (LEV2) The valve opening changes according to the number of pulses.
  • Page 206 [ X Troubleshooting ] 4) LEV closing and opening operation *Upon power on, the indoor unit circuit board sends a 2200 pulse signal to the indoor unit LEV and a 3200 pulse signal to the outdoor unit LEV to determine the valve position and always brings the valve to the position as indicated by "...
  • Page 207 [ X Troubleshooting ] (2) Outdoor LEV (LEV1) The valve opening changes according to the number of pulses. 1) Connections between the outdoor control board and LEV1 (outdoor expansion valve) Outdoor control board DC 12V Brown Drive circuit Blue Orange Yellow White 2) Pulse signal output and valve operation...
  • Page 208 [ X Troubleshooting ] (3) Judgment methods and possible failure mode The specifications of the outdoor unit (outdoor LEV) and the indoor unit (indoor LEV) differ.Therefore, remedies for each failure may vary. Check the remedy specified for the appropriate LEV as indicated in the right column. Malfunction Judgment method Remedy...
  • Page 209 [ X Troubleshooting ] (4) Outdoor unit LEV (LEV1) coil removal procedure 1) LEV component As shown in the figure, the outdoor LEV is made in such a way that the coils and the body can be separated. Body Coils Stopper Lead wire 2) Removing the coils...
  • Page 210 [ X Troubleshooting ] (5) Removal procedure of outdoor unit LEV2 coil 1) Components The outdoor unit LEV consists of a coil and a valve body that can be separated from each other. Body Stopper Coil Lead wire 2) Removing the coil Securely hold the LEV at the bottom (as indicated by A in the figure), and turn the coil.
  • Page 211 [ X Troubleshooting ] -6- Inverter Replace only the compressor if only the compressor is found to be defective. Replace only the fan motor if only the fan motor is found to be defective. Replace the defective components if the inverter is found to be defective. If both the compressor and the inverter are found to be defective, replace the defective component(s) of both devices.
  • Page 212 [ X Troubleshooting ] Error display/failure condition Measure/inspection item Inverter related errors Check the details of the inverter error in the error log at XI [1] Table of 4250, 4255, 4220, 4225, 4230, 4240,4260, 5301, 0403 LED codes. Take appropriate measures to the error code and the error details in ac- cordance with X [2] Self-diagnosis on the basis of Error Display on Re- mote Controller and Remedy for Error.
  • Page 213 [ X Troubleshooting ] (2) Inverter output related troubles Items to be checked Phenomena Remedy Disconnect the invert- Overcurrent error Replace the INV board. Check the er output wire from (4250 Detail code No. 101, 104, INV board er- the terminals of the 105, 106, and 107) ror detection INV board (SC-U,...
  • Page 214 [ X Troubleshooting ] Items to be checked Phenomena Remedy Disconnect the inverter Inverter-related problems are de- Connect the short-circuit con- Check whether output wire from the ter- tected. nector to CN6, and go to sec- the inverter is minals of the INV board tion [1].
  • Page 215 [ X Troubleshooting ] (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 216 [ X Troubleshooting ] (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. Part name Judgment method IGBT module...
  • Page 217 [ X Troubleshooting ] Judgment value (reference) Black ( + ) SC-P1 FT-N SC-L1 SC-L2 SC-L3 SC-P1 5 - 200 ohm 5 - 200 ohm 5 - 200 ohm FT-N Red (-) SC-L1 5 - 200 ohm SC-L2 5 - 200 ohm SC-L3 5 - 200 ohm Black ( + )

  • Page 218: Indoor Unit

    [ X Troubleshooting ] -7- Control Circuit (1) Control power source function block Power source system (AC 380 / 415 V) Control system (DC 5 ~ 30 V) INV board Noise filter Compressor Smoothing capacitor Inverter Noise filter Rectifier AC 380/ 415V Fuse Terminal block for Inverter drive...
  • Page 219 [ X Troubleshooting ] (2) Troubleshooting transmission power circuit of outdoor unit Check the voltage at the indoor/outdoor transmission terminal block (TB3) of outdoor unit. DC 24 ~ 30 V Check whether the transmission line is disconnected, check for contact failure, and repair the problem. Check the voltage at TB3 after removing transmission line from TB3.

  • Page 220: Refrigerant Leak

    [ X Troubleshooting ] [5] Refrigerant Leak 1. Leak spot: In the case of extension pipe for indoor unit (Cooling season) 1) Mount a pressure gauge on the service check joint (CJ2) on the low-pressure side. 2) Stop all the indoor units, and close the liquid service valve (BV2) inside the outdoor unit while the compressor is being stopped. 3) Stop all the indoor units;...
  • Page 221 [ X 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 222: Compressor Replacement Instructions

    [ X Troubleshooting ] [6] Compressor Replacement Instructions [Compressor replacement procedures] Follow the procedures below (Steps 1 through 6) to remove the compressor components and replace the compressor. Reassemble them in the reverse order after replacing the compressor. 1. Remove both the top and bottom service panels 2.
  • Page 223 [ X Troubleshooting ] Compressor covers (right and left) (The inside of the compressor cover is lined with sound insulation material.) Compressor cover (top) Crankcase heater 4. Remove the compressor cover (top). 5. Remove the compressor wires, compressor covers (right and left), and crankcase heater. Protection for the sealing material Suction piping...

  • Page 224: Troubleshooting Using The Outdoor Unit Led Error Display

    [ X Troubleshooting ] [7] Troubleshooting Using the Outdoor Unit LED Error Display If the LED error display appear as follows while all the SW1 switches are set to OFF, check the items under the applicable item numbers below. 1. Error code appears on the LED display. Refer to X [2] Responding to Error Display on the Remote Controller.(page 132) 2.
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  • Page 226 XI LED Monitor Display on the Outdoor Unit Board [1] How to Read the LED on the Service Monitor ............... 219 - 217 - HWE10190...
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  • Page 228 [ XI LED Monitor Display on the Outdoor Unit Board ] XI LED Monitor Display on the Outdoor Unit Board [1] How to Read the LED on the Service Monitor 1. How to read the LED By setting the DIP SW 1-1 through 1-10 (Switch number 10 is represented by 0), the operating condition of the unit can be monitored on the service monitor.
  • Page 229 [ XI LED Monitor Display on the Outdoor Unit Board ] 3. Time data storage function The outdoor unit has a simple clock function that enables the unit to calculate the current time with an internal timer by receiv- ing the time set by the system controller, such as G(B)-50A. If an error (including a preliminary error) occurs, the error history data and the error detection time are stored into the service memory.
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