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Mitsubishi Electric PUHZ-W50VHA Service Manual
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Mitsubishi Electric PUHZ-W50VHA Service Manual

Mitsubishi Electric PUHZ-W50VHA Service Manual

Air to water
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AIR TO WATER HEAT PUMP

SERVICE MANUAL

R410A
[model name]
PUHZ-W50VHA
PUHZ-W50VHA-BS
PUHZ-W85VHA
PUHZ-W85VHA-BS
PUHZ-HW112YHA
PUHZ-HW112YHA-BS
PUHZ-HW140VHA
PUHZ-HW140VHA-BS
PUHZ-HW140YHA
PUHZ-HW140YHA-BS
PUHZ-W85VHA
PUHZ-W85VHA-BS
[Service Ref.]
PUHZ-W50VHA
PUHZ-W50VHA-BS
PUHZ-W85VHA
PUHZ-W85VHA-BS
PUHZ-HW112YHA
PUHZ-HW112YHA-BS
PUHZ-HW140VHA
PUHZ-HW140VHA-BS
PUHZ-HW140YHA
PUHZ-HW140YHA-BS
REVISED EDITION-A
Revision:
• PUHZ-W50V/HW112Y/HW140V/
HW140YHA(-BS) and PUHZ-
W85VHA-BS are added in
REVISED EDITION-A.
• Some descriptions have been
modified.
• Please void OCH439.
Note:
• This manual describes only
service data of outdoor unit.
• RoHS compliant products have
<G> mark on the spec name plate.
CONTENTS
1. SAFETY PRECAUTION .......................................... 2
2. SPECIFICATIONS ..................................................... 5
3. DATA ............................................................................. 9
4. OUTLINES AND DIMENSIONS .......................... 11
5. WIRING DIAGRAM ................................................. 14
6. WIRING SPECIFICATIONS .................................. 18
7. REFRIGERANT SYSTEM DIAGRAM ................... 19
8. TROUBLESHOOTING ........................................... 21
9. DISASSEMBLY PROCEDURE ........................... 58
PARTS CATALOG (OCB439)
September 2008
No. OCH439

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Summary of Contents for Mitsubishi Electric PUHZ-W50VHA

  • Page 1: Table Of Contents

    September 2008 No. OCH439 REVISED EDITION-A SERVICE MANUAL R410A Revision: • PUHZ-W50V/HW112Y/HW140V/ [model name] [Service Ref.] HW140YHA(-BS) and PUHZ- W85VHA-BS are added in PUHZ-W50VHA PUHZ-W50VHA REVISED EDITION-A. PUHZ-W50VHA-BS PUHZ-W50VHA-BS • Some descriptions have been modified. PUHZ-W85VHA PUHZ-W85VHA PUHZ-W85VHA-BS PUHZ-W85VHA-BS • Please void OCH439.

  • Page 2: Safety Precaution

    SAFETY PRECAUTION 1-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. 1-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Do not use refrigerant other than R410A. If other refrigerant (R22 etc.) is used, chlorine in refrigerant can cause deterioration of refrigerant oil etc. Use a vacuum pump with a reverse flow check valve.
  • Page 3 Unit Gravimeter [3] Service tools Use the below service tools as exclusive tools for R410A refrigerant. Tool name Specifications Gauge manifold ·Only for R410A ·Use the existing fitting specifications . (UNF1/2) ·Use high-tension side pressure of 5.3 MPa·G or over. Charge hose ·Only for R410A ·Use pressure performance of 5.09 MPa·G or over.
  • Page 4 1-4. PRECAUTIONS FOR SALT PROOF TYPE "-BS" MODEL Although "-BS" model has been designed to be resistant to salt damage, observe the following precautions to maintain the performance of the unit. 1. Avoid installing the uint in a location where it will be exposed directly to seawater or sea breeze. 2.

  • Page 5: Specifications

    SPECIFICATIONS PUHZ-W50VHA(-BS) 1 , 230V, 50Hz Nominal water flow rate (Heating mode) L/min 14.3 Heating(A7/W35) Heating y t i (Min.1.50 ) 5.00 °C (A7/W35) 4.10 °C 1.22 l n i °C Heating y t i (Min.1.50 ) 5.00 Heating(A2/W35) (A2/W35) 3.13...
  • Page 6 PUHZ-W85VHA(-BS) 1 , 230V, 50Hz Nominal water flow rate (Heating mode) L/min 25.8 Heating(A7/W35) (Min.2.70 ) 9.00 Heating y t i 3.85 (A7/W35) 2.34 l n i (Min.2.60 ) 8.50 Heating y t i Heating(A2/W35) 2.95 (A2/W35) 2.88 Pressure difference (water circuit) l n i /+35 0.03...
  • Page 7 PUHZ-HW112YHA(-BS) 3 , 400V, 50Hz Nominal water flow rate (Heating mode) L/min 32.1 Heating(A7/W35) (Min. 3.40 ) 11.20 Heating y t i 4.24 (A7/W35) 2.64 l n i Heating y t i (Min. 3.40 ) 11.20 Heating(A2/W35) 3.01 (A2/W35) 3.72 Pressure difference (water circuit) l n i /+35...
  • Page 8 PUHZ-HW140VHA(-BS) PUHZ-HW140YHA(-BS) 1/3 , 230/400V, 50Hz Nominal water flow rate (Heating mode) L/min 40.1 Heating(A7/W35) y t i (Min. 4.20 ) 14.00 Heating 4.19 (A7/W35) 3.34 l n i Heating y t i (Min. 4.20 ) 14.00 Heating(A2/W35) 2.69 (A2/W35) 5.21 Pressure difference (water circuit) l n i...

  • Page 9: Data

    DATA 3-1. NOISE CRITERION CURVES PUHZ-W50VHA(-BS) SPL(dB) MODE LINE MICROPHONE COOLING HEATING UNIT 1.5m NC-70 NC-60 GROUND NC-50 NC-40 NC-30 APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz PUHZ-W85VHA(-BS) PUHZ-HW112YHA(-BS) SPL(dB) MODE...
  • Page 10 12,500 14,000 Input 1.52 1.21 3.12 2.31 3.67 2.63 4.80 3.32 PUHZ-HW140VHA Outdoor unit PUHZ-W50VHA PUHZ-W85VHA PUHZ-HW112YHA / PUHZ-HW140YHA Phase, Hz 1, 50 1, 50 3, 50 1 / 3, 50 Voltage 230 / 400 Current 13.7 10.3 21.5 / 7.314.9 / 5.1 Discharge pressure 2.51...

  • Page 11: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: mm PUHZ-W50VHA(-BS)
  • Page 12 Unit: mm PUHZ-W85VHA(-BS)
  • Page 13 Unit: mm PUHZ-HW112YHA(-BS) PUHZ-HW140VHA(-BS) PUHZ-HW140YHA(-BS)

  • Page 14: Wiring Diagram

    WIRING DIAGRAM PUHZ-W50VHA(-BS) SYMBOL NAME SYMBOL NAME Terminal Block<Power Supply,Interface unit / CB1-3 Main Smocthing Capacitor Flow temp. controller> PFC/IPM Power Module Motor for Compressor N.F. Noise Filter Circuit Board Fan Motor LI,LO Connection Terminal<L-Phase> 21S4 Solenoid Valve<Four-Way Valve> Connection Terminal<N-Phase>...
  • Page 15 PUHZ-W85VHA(-BS) SYMBOL NAME SYMBOL NAME Terminal Block <Power Supply,Interface unit / TABN1/N2 Connection Terminal <DC Voltage> Flow temp. controller> DS2, DS3 Diode bridge Motor for Compressor Power Module Fan Motor N.F. Noise Filter Circuit Board 21S4 Solenoid Valve <Four-Way Valve> LI,LO Connection Terminal <L-Phase>...
  • Page 16 PUHZ-HW140VHA(-BS) SYMBOL NAME P.B. Power Circuit Board Terminal Block<Power Supply, Interface unit / U/V/W Connection Terminal<U/V/W-Phase> Flow Temp. controller-Outdoor> Connection Terminal<L-Phase> Motor for Compressor Connection Terminal<N-Phase> MF1,MF2 Fan Motor DCL1,DCL2 Connection Terminal<Reactor> 21S4 Solenoid Valve<Four-Way Valve> Power Module IGBT High Pressure Switch Connection Terminal<Ground>...
  • Page 17 PUHZ-HW112YHA(-BS) PUHZ-HW140YHA(-BS) SYMBOL NAME SYMBOL NAME Terminal Block<Power Supply> N.F. Noise Filter Circuit Board Terminal Block<Interface unit /Flow Temp. Connection Terminal<L1/L2/L3/N-Power Supply> LI1/LI2/LI3/NI controller-Outdoor> LO1/LO2/LO3/NO Connection Terminal<L1/L2/L3/N-Power Supply> Motor for Compressor GD1,GD3 Connection Terminal<Ground> MF1,MF2 Fan Motor CONV.B. Converter Circuit Board 21S4 Solenoid Valve<Four-Way Valve>...

  • Page 18: Wiring Specifications

    WIRING SPECIFICATIONS FIELD ELECTRICAL WIRING (power wiring specifications) t i n 85 V 140 V 112 Y,140 Y Outdoor unit power supply ~/N (single), 50 Hz, 230 V ~/N (single), 50 Hz, 230 V ~/N (single), 50 Hz, 230 V 3N~ (3phase), 50 Hz, 400 V t i n c r i t i u...

  • Page 19: Refrigerant System Diagram

    Refrigerant flow in cooling Symbol Part name Detail COMP Compressor DC inverter twin rotary compressor (Mitsubishi Electric Corporation) H/P SW High pressure switch (63H) For protection (OFF:4.15MPa) Plate HEX Plate Heat Exchanger ACH30 - 30 Plates (Alfa Laval):W50 / ACH30 - 40 Plates (Alfa Laval):W85...
  • Page 20 Refrigerant flow in heating Refrigerant flow in cooling Symbol Part name Detail COMP Compressor DC inverter scroll compressor (Mitsubishi Electric Corporation) H/P SW For protection (OFF:4.15MPa) High pressure switch (63H) L/P SW Low pressure switch (63L) For protection (OFF:-0.03MPa) Plate HEX...

  • Page 21: Troubleshooting

    TROUBLESHOOTING 8-1. TROUBLESHOOTING <Error code display by self-diagnosis and actions to be taken for service (summary)> Present and past error codes are logged and displayed on the control board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring at service, are summarized in the table below. Check the contents below before investigating details.
  • Page 22 8-3. SELF-DIAGNOSIS ACTION TABLE <Abnormalities detected when the power is turned on> Abnormal point and detection method Judgment and action Error Code Case 1 No voltage is supplied to termi- 1 Check following items. nal block(TB1) of outdoor unit. a) Power supply breaker a) Power supply breaker is turned off.
  • Page 23 Abnormal point and detection method Case Judgment and action Error Code 1 Disconnection or contact failure 1 Check connection of 63H connector on 63H connector open Abnormal if 63H connector circuit is open of 63H connector on outdoor outdoor controller circuit board. for 3 minutes continuously from being controller circuit board Refer to 8-6.
  • Page 24 <Abnormalities detected while unit is operating> Abnormal point and detection method Judgment and action Error Code Case 1 Decreased water flow 1~5 Check water circuit and repair the defect. High pressure (High-pressure switch 2 Clogged filter of water pipe 63H activated) 3 Dirt of plate heat exchanger Abnormal if high-pressure switch 63H is activated ( w ) during compressor opera-...
  • Page 25 Abnormal point and detection method Case Judgment and action Error Code Open/short of outdoor unit thermistors 1 Disconnection or contact failure 1 Check connection of connector (TH3, TH32, (TH3, TH32, TH33, TH6, TH7, and TH8) of connectors TH33, TH6/TH7) on the outdoor controller circuit Abnormal if open or short is detected Outdoor controller circuit board.
  • Page 26 Abnormal point and detection method Case Judgment and action Error Code 1 Failure in the operation of 1 Check or replace the DC fan motor. Outdoor fan motor Abnormal if rotational frequency of the fan the DC fan motor motor is not detected during DC fan motor 2 Failure in the outdoor circuit 2 Check the voltage of the outdoor circuit operation.
  • Page 27 Abnormal point and detection method Judgment and action Error Code Case Current sensor error or input current error 1 Disconnection of compressor 1 Correct the wiring (U W phase) to com- • • ·Abnormal if current sensor detects –1.0 A wiring pressor.
  • Page 28 Abnormal point and detection method Judgment and action Error Code Case Remote controller transmission error 1 2 remote controllers are set as 1 Set a remote controller to main, and the (E3)/signal receiving error (E5) 1 Abnormal if remote controller could not find “main.”...
  • Page 29 Abnormal point and detection method Judgment and action Error Code Case Freezing/overheating protection is working <Cooling mode> <Cooling mode> (1) Freezing protection <Cooling mode> 1 Reduced water flow 12 Check water piping. Abnormal if plate heat exchanger pipe · Clogged filter temperature (TH6) stays at -5: or lower ·...
  • Page 30 3. Defrosting mode During compressor operation TH32 < 0: Thermistor TH32: Inlet water temperature 8-4. HOW TO CHECK THE PARTS PUHZ-W50VHA(-BS) PUHZ-W85VHA(-BS) PUHZ-HW112YHA(-BS) PUHZ-HW140V/YHA(-BS) Parts name Check points TH3: Liquid pipe Disconnect the connector then measure the resistance with a tester.
  • Page 31 Check method of DC fan motor (fan motor / outdoor controller circuit board) Notes · High voltage is applied to the connector (CNF1, 2) for the fan motor. Give attention to the service. · Do not pull out the connector (CNF1, 2) of the motor with the power supply on. (It may damage the outdoor controller circuit board and fan motor.) Self check...
  • Page 32 8-5. HOW TO CHECK THE COMPONENTS <Thermistor feature chart> Low temperature thermistors • Thermistor <Liquid pipe> (TH3) • Thermistor <Plate Hex liquid pipe> (TH6) • Thermistor <Ambient> (TH7) • Thermistor <Suction pipe> (TH33 for HW112,140) Thermistor R0 = 15k' ± 3% B constant = 3480 ±...
  • Page 33 Low temperature thermistor • Thermistor <Inlet water> (TH32) Thermistor R0 = 15k' ± 2.5% B constant = 3450 ± 2% =15exp{3450( 273+t – 273 )} 15k' 4.3k' 9.6k' 3.0k' 6.3k' 5.2k' -20 -10 10 20 30 40 50 Temperature( )
  • Page 34 Linear expansion valve (1) Operation summary of the linear expansion valve • Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board. • Valve position can be changed in proportion to the number of pulse signal. <Connection between the outdoor controller board and the linear expansion valve>...
  • Page 35 (3) How to attach and detach the coil of linear expansion valve <Composition> Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Main body Stopper Coil Lead wire <How to detach the coil> Hold the lower part of the main body (shown as A) firmly so that the main body does not move and detach the coil by pulling it upward.
  • Page 36 8-6. TEST POINT DIAGRAM <CAUTION> TEST POINT 1 is high voltage. Outdoor controller circuit board PUHZ-W50VHA(-BS) PUHZ-W85VHA(-BS) (TEST POINT 1) (TEST POINT 2) (voltage between pins of C5E) S1-S2: 220-240 V AC (voltage between pins of C6B): DC 15 V...
  • Page 37 <CAUTION> TEST POINT 1 is high voltage. Outdoor controller circuit board PUHZ-HW112YHA(-BS) PUHZ-HW140YHA(-BS) PUHZ-HW140VHA(-BS) Operation monitor function Forced defrost, detect history record reset Model select CNDM 1 to 2: Input of low-level sound priority mode CN52C Function switch (Connect to the power circuit board (CN52C)) Function switch (HW140V)
  • Page 38 Outdoor noise filter circuit board PUHZ-W50VHA(-BS) EI, E2 Connect to the earth Connect to the earth CNAC1, CNAC2 220-240 V AC (Connect to the outdoor control- ler circuit board (CNAC)) Primary current (Connect to the outdoor power circuit board (CN5))
  • Page 39 Outdoor noise filter circuit board LO, NO PUHZ-W85VHA(-BS) Voltage of 220-240 V AC is output. Connect to the outdoor power circuit board (TABS, TABT). CNAC1, CNAC2 Connect to the 220-240 V AC earth. Connect to the out- door controller cir- cuit board (CNAC).
  • Page 40 Outdoor noise filter circuit board PUHZ-HW112YHA(-BS) PUHZ-HW140YHA(-BS) LI1, LI2, LI3, NI POWER SUPPLY LI1-LI2/LI-LI3/LI3-LI1 : AC380/400/415V input LI1-NI/LI2-NI/LI3-NI : AC220/230/240V input (Connect to the terminal block (TB1)) Connect to the earth CNAC1, CNAC2 AC220/230/240V (Connect to the outdoor controller Connect to the earth circuit board (CNAC)) CNCT Primary current...
  • Page 41 Brief Check of DIP-IPM and DIP-PFC W Usually, they are in a state of being short-circuited if they are broken. PUHZ-W50VHA(-BS) Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken.
  • Page 42 Outdoor power circuit board PUHZ-W85VHA(-BS) Brief Check of POWER MODULE w Usually, they are in a state of being short-circuited if they are broken. Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken. 1.
  • Page 43 Outdoor power circuit board PUHZ-HW140VHA(-BS) Connect to the outdoor controller circuit board (CN2) 1-5: Transmitting signal to outdoor controller circuit board (0-5 V DC) Connect to the outdoor 2-5: Zero cross signal (0-5 V DC) controller circuit board (CN4) 3-4: 18 V DC 6-5: 16 V DC 7-5: 16 V DC CN52C...
  • Page 44 Brief Check of POWER MODULE W Usually, they are in a state of being short-circuited if they are broken. Outdoor power circuit board Measure the resistance in the following points (connectors, etc.). PUHZ-HW112YHA(-BS) If they are short-circuited, it means that they are broken. 1.
  • Page 45 Outdoor converter circuit board PUHZ-HW112YHA(-BS) PUHZ-HW140YHA(-BS) L1-A1 L1-IN, N-IN CK-OU Connect to the ACL1 Connect to the noise filter Connect to the CK capacitor circuit board (LO1, No) Connect to the outdoor power circuit board (CN7) L1-A2, L2-A2, L3-A2 L1-OU, L2-OU, L3-OU Connect to the ACL1, ACL2, ACL3 Connect to the outdoor power circuit board (TB-L1, L2, L3)
  • Page 46 Active filter module PUHZ-W85VHA(-BS) Connect to the outdoor power circuit board (TABP2) L1, L2 Connect to the Non-connect DCL (Reactor) Upper Lower side side Non-connect Connect to the outdoor power circuit board (TABP1) Connect to the outdoor power circuit board (CNAF) –...
  • Page 47 8-7. OUTDOOR UNIT OPERATION MONITOR FUNCTION Operation indicator SW2: Indicator change of self diagnosis Explanation for display Unit SW2 setting Display detail 2 3 4 5 6 <Digital indicator LED3 working details> (Be sure that the 1 to 6 in the SW2 are set to OFF.) (1) Display when the power supply is ON.
  • Page 48 SW2 setting Display detail Explanation for display Unit Pipe temperature / Liquid (TH3) – 40~90 – 40~90 (When the coil thermistor detects 0: or below, “–” and temperature are displayed by turns.) (Example) When -10:; 2 3 4 5 6 0.5 secs.
  • Page 49 SW2 setting Display detail Explanation for display Unit Pipe temperature/Liquid (TH3) when – 40~90 error occured. (When the coil thermistor detects 0: or below, “–” – 40~90 and temperature are displayed by turns.) (Example) When –15:; 0.5 secs. 0.5 secs. 2 secs. 2 3 4 5 6 Discharge temperature (TH4) when error 3~217...
  • Page 50 SW2 setting Display detail Explanation for display Unit Outdoor unit setting information • The tens digit (Total display for applied setting) Setting details Display details H·P / Cooling only 0 : H·P 1 : Cooling only Single phase / 3 phase 0 : Single phase 2 : 3 phase Code •...
  • Page 51 SW2 setting Display detail Explanation for display Unit 0~130 Sub cool (SC) (When the SC is 100°C or more, hundreds digit, tens 0~130 digit and ones digit are displayed by turns.) °C Cooling: SC = T -TH3 63HS 2 3 4 5 6 Heating: SC = T -TH6 63HS...
  • Page 52 SW2 setting Display detail Explanation for display Unit When no error history, “0” and “– –“ are displayed by Error code history (3) (Oldest) Faulty unit number and error code are turns. displayed alternately. Code display 2 3 4 5 6 Error thermistor display 3: Liquid pipe thermistor (TH3) 3: Water inlet temp.
  • Page 53 SW2 setting Display detail Explanation for display Unit Outdoor heatsink temperature (TH8) -40~200 when error occured. (When the temperature is 0°C or less, “–” and temperature are displayed by turns.) -40~200 (When the temperature is 100°C or more, hundreds 2 3 4 5 6 digit, tens digit and ones digit are displayed by turns.) Discharge superheat (SHd) when error...
  • Page 54 SW2 setting Display detail Explanation for display Unit 3~217 Comp. shell temperature (TH33) (for W50) 3~217 (When the temperature is 100: or more, the hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 130:; 2 3 4 5 6 0.5 secs.
  • Page 56 8-8. FUNCTION OF SWITCHES PUHZ-W50VHA(-BS) PUHZ-W85VHA(-BS) Switch Selection Effective timing Function Initial setting* Function details (SW1, 8) / Mark No. ON (with) OFF (without) Note (SW6) Switch ON to force defrosting When compressor Forced ON to start Usual setting is working in heat- defrosting ing mode.
  • Page 57 PUHZ-HW112YHA(-BS) PUHZ-HW140YHA(-BS) PUHZ-HW140VHA(-BS) Switch Selection Function Initial setting* Function details Effective timing mark No. (with) (without) Switch ON to force Forced defrosting ON to start usual setting Always defrosting Switch ON to clear (erase) the followings: (1)Error codes and To clear error Suspension fl...

  • Page 58: Disassembly Procedure

    DISASSEMBLY PROCEDURE PUHZ-W50VHA(-BS) PUHZ-W85VHA(-BS) PHOTO: PUHZ-W85VHA OPERATING PROCEDURE PHOTOS & ILLUSTRATION Top panel fixing screws 1. Removing the service panel and top panel Photo 1 Top panel (1) Remove 3 screws (5 x 10) and slide the hook on the right downward to remove the service panel.
  • Page 59 OPERATING PROCEDURE PHOTOS & ILLUSTRATION 4. Removing the thermistor <Plate HEX Liquid> (TH6) Photo 5 (1) Remove the service panel. (See Photo 1.) (2) Remove the top panel. (See Photo 1.) (3) Disconnect the connector TH7/6 (red) on the controller Plate HEX liquid Outdoor liquid circuit board.

  • Page 60: Heating

    OPERATING PROCEDURE PHOTOS & ILLUSTRATION 8. Removing the solenoid valve coil <4-way valve> (21S4) Photo 9 linear expansion valve coil (LEV (A), LEV (B)) and solenoid valve coil <Bypass valve> (SV) 4-way 4-way valve LEV-A (1) Remove the service panel. (See Photo 1.) valve coil (21S4) (2) Remove the top panel.
  • Page 61 OPERATING PROCEDURE PHOTOS & ILLUSTRATION 11. Removing the bypass valve Photo 11 (1) Remove the service panel. (See Photo 1.) (2) Remove the top panel. (See Photo 1.) (3) Remove the electrical parts box. (See Photo 4.) Solenoid LEV-A Four-way valve LEV-B (4) Remove 3 right side panel fixing screws (5 x 10) in the rear valve coil (21S4)
  • Page 62 OPERATING PROCEDURE PHOTOS & ILLUSTRATION Terminal cover 14. Removing the compressor (MC) Photo 12 (1) Remove the service panel. (See Photo 1.) (2) Remove the top panel. (See Photo 1.) Lead wire for (3) Remove 2 screws (5 x 10) and remove the front cover panel. compressor (4) Remove 2 screws (5 x 10) and remove the back cover panel.

  • Page 63: Noise

    No.17~22 for PUHZ-W85VHA(-BS) OPERATING PROCEDURE PHOTOS & ILLUSTRATION 17. Removing the controller circuit board (C.B.): Figure 1 Figure 1 Active filter module (ACTM) (1) Remove all lead wire connectors on controller circuit board (C.B.). CNF1, CNDC, CNAC, CN2, CN4, CN52C, Electrical Power circuit board (P.B.) 21S4, SV2, 63H, 63HS, LEV-A, LEV-B,...

  • Page 64: Noise

    No.23~27 for PUHZ-W50VHA(-BS) OPERATING PROCEDURE PHOTOS & ILLUSTRATION 23. Removing the controller circuit board (C.B.): Figure 3, Photo 17 Power circuit board (P.B.) Figure 3 (1) Remove all lead wire connectors on controller circuit board (C.B.). Controller circuit board (P.B.)

  • Page 65: Noise

    PUHZ-HW112YHA(-BS) PUHZ-HW140YHA(-BS) PUHZ-HW140VHA(-BS) OPERATING PROCEDURE PHOTOS & ILLUSTRATION 1. Removing the service panel and top panel Photo 1 Top panel fixing screws Top panel (1) Remove 3 service panel fixing screws (5 10) and slide the hook on the right downward to remove the service panel.

  • Page 66: Noise

    OPERATING PROCEDURE PHOTOS & ILLUSTRATION 4. Disassembling the electrical parts box (PUHZ-HW112/140YHA) Electrical (1) Disconnect all the connectors on the controller circuit parts box Photo 6 board. (2) Remove the 3 screws, screw 1, 2 and 3, that fix the plate equipped with the outdoor controller circuit board, and the electrical parts box, screw 1 from the front and the screw 2 and 3 from the bottom of the electrical parts...
  • Page 67 PHOTOS OPERATING PROCEDURE Photo 11 5. Removing the thermistor <Plate HEX liquid> (TH6) and thermistor <Outdoor> (TH7) (1) Remove the service panel. (See Photo 1.) (2) Remove the top panel. (See Photo 1.) (3) Disconnect the connectors, TH7/6 (red) on the controller circuit board in the electrical parts box.
  • Page 68 OPERATING PROCEDURE PHOTOS 8. Removing the 4-way valve coil (21S4), and linear expan- Photo 15 High pressure switch (63H) sion valve coil (LEV-A, LEV-B, LEV-C) (1) Remove the service panel. (See Photo 1.) (2) Remove the top panel. (See Photo 1.) [Removing the 4-way valve coil] (See Photo 15.) (3) Remove 4-way valve solenoid coil fixing screw (M4 (4) Remove the 4-way valve coil by sliding the coil toward you.
  • Page 69 OPERATING PROCEDURE PHOTOS Photo 18 12. Removing high pressure sensor (63HS) (1) Remove the service panel. (See Photo 1.) Muffler Low pressure switch (63L) (2) Remove the top panel. (See Photo 1.) (3) Pull out the lead wire of high pressure sensor. (4) Remove the 4-way valve coil.
  • Page 70 OPERATING PROCEDURE PHOTOS 14. Removing the reactors (ACL1, ACL2, ACL3) Electrical parts box Photo 20 (PUHZ-HW112/140YHA) (1) Remove the service panel. (See Photo 1.) (2) Remove the top panel. (See Photo 1.) (3) Remove the 6 screws, that fix the front panel and remove the front panel.
  • Page 71 OPERATING PROCEDURE PHOTOS 15. Removing the compressor (MC) Photo 23 (1) Remove the service panel. (See Photo 1.) (2) Remove the top panel. (See Photo 1.) (3) Remove 2 front cover panel fixing screws (5 10) and Terminal cover Pipes of power receiver Compressor (MC) remove the front cover panel.
  • Page 72 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in Sep. 2008 No. OCH439 REVISED EDITION-A PDF 7 Distributed in Apr. 2008 No. OCH439 PDF 8 New publication, effective Sep. 2008...

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