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Mitsubishi Electric PUHZ-W90VHA Service Manual

Air to water heat pump
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AIR TO WATER HEAT PUMP

SERVICE MANUAL

R410A
[model name]
PUHZ-W90VHA
PUHZ-W90VHA
[Service Ref.]
PUHZ-W90VHA
Note:
• This manual describes only
service data of PUHZ-W90VHA.
• RoHS compliant products have
mark on the spec name plate.
CONTENTS
1. SAFETY PRECAUTION .......................................... 2
2. SPECIFICATIONS ..................................................... 4
3. DATA ............................................................................. 5
4. OUTLINES AND DIMENSIONS ............................ 7
5. WIRING DIAGRAM ................................................... 8
6. WIRING SPECIFICATIONS .................................... 9
7. REFRIGERANT SYSTEM DIAGRAM ................... 10
8. TROUBLESHOOTING ........................................... 11
9. DISASSEMBLY PROCEDURE ........................... 38
PARTS CATALOG (OCB419)
August 2007
No. OCH419
Table of Contents
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Summary of Contents for Mitsubishi Electric PUHZ-W90VHA

  • Page 1: Table Of Contents

    [Service Ref.] [model name] Note: PUHZ-W90VHA PUHZ-W90VHA • This manual describes only service data of PUHZ-W90VHA. • RoHS compliant products have mark on the spec name plate. CONTENTS 1. SAFETY PRECAUTION .......... 2 2. SPECIFICATIONS ............. 4 3. DATA ................5 4.

  • Page 2: Safety Precaution

    SAFETY PRECAUTION 1-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply ciucuits 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. Specifications Gauge manifold ·Only for R410A ·Use the existing fitting specifications . (UNF1/2) ·Use high-tension side pressure of 5.3MPa·G or over. Charge hose ·Only for R410A ·Use pressure performance of 5.09MPa·G or over.

  • Page 4: Specifications

    (COP) 3.55 20.4 l n i Cooling Capacity Cooling(A35/W18) 3.70 (A35/W18) EER Outside air temperature (Dry-bulb) (COP) 1.92 20.4 l n i PUHZ-W90VHA Model name ALFA LAVAL Running current Heating 10.3 (A7/W35) 15.7 Cooling (A35/W7) 23.0 Water OUT Ref.IN (Heating)

  • Page 5: Data

    DATA 3-1. NOISE CRITERION CURVES MICROPHONE UNIT 1.5m GROUND PUHZ-W90VHA SPL(dB) MODE LINE COOLING HEATING NC-70 NC-60 NC-50 NC-40 NC-30 APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz...

  • Page 6: Standard Operation Data

    3-2. STANDARD OPERATION DATA Mode Cooling (A35/W7) Heating (A7/W35) Capacity 7,100 9,000 Input 3.55 2.31 Outdoor unit PUHZ-W90VHA Phase, Hz 1, 50 Voltage Current 15.7 10.3 Discharge pressure 2.74 2.21 Suction pressure 0.73 0.64 Discharge temperature Condensing temperature Suction temperature...

  • Page 7: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PUHZ-W90VHA Unit : mm...

  • Page 8: Wiring Diagram

    WIRING DIAGRAM PUHZ-W90VHA SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block P.B. Power Circuit Board C.B. Controller Circuit Board Terminal Block TABU/V/W Connection Terminal Switch Terminal Block TABS/T Connection Terminal Switch Motor for Compressor TABP1/P2 Connection Terminal...

  • Page 9: Wiring Specifications

    WIRING SPECIFICATIONS FIELD ELECTRICAL WIRING (power wiring specifications) Outdoor unit power supply ~/N (single), 50Hz, 230 V Outdoor unit Circuit Breaker capacity 25 A Outdoor unit power supply, earth 3 × Min.4 Controller-Outdoor unit 8 × Min.0.5 (polar) Outdoor unit L-N (single) AC 230 V Controller-Outdoor unit DC 12 V...

  • Page 10: Refrigerant System Diagram

    Refrigerant flow in heating 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 - 40 Plates (Alfa Laval)

  • Page 11: Troubleshooting

    TROUBLESHOOTING 8-1. TROUBLESHOOTING 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 12: Self-Diagnosis Action Table

    8-3. SELF-DIAGNOSIS ACTION TABLE Abnormal point and detection method Judgment and action Case Error Code No voltage is supplied to terminal Check following items. block(TB1) of outdoor unit. a) Power supply breaker a) Power supply breaker is b) Connection of power supply terminal block.
  • Page 13 Abnormal point and detection method Judgment and action Error Code Case High pressure (High-pressure switch Decreased water flow ~ Check water circuit and repair the defect. 63H activated) Clogged filter of water pipe Abnormal if high-pressure switch 63H is Dirt of plate heat exchanger activated ( ) during compressor opera-...
  • Page 14 Abnormal point and detection method Judgment and action Error Code Case Open/short of outdoor unit thermistors Disconnection or contact failure Check connection of connector (TH3,TH32, (TH3, TH32, TH6, TH7, and TH8) TH6/TH7) on the outdoor controller circuit board. of connectors Abnormal if open or short is detected Check connection of connector (CN3) on the Outdoor controller circuit...
  • Page 15 Abnormal point and detection method Judgment and action Error Code Case Too low superheat due to low discharge Disconnection or loose Check the installation conditions of temperature connection of discharge discharge temperature thermistor (TH4). Abnormal if discharge superheat is temperature thermistor (TH4) continuously detected -15 or less for Defective holder of discharge...
  • Page 16 Abnormal point and detection method Judgment and action Error Code Case Current sensor error or input current error Disconnection of compresso Correct the wiring (U W phase) to com- • • ·Abnormal if current sensor detects –1.0A wiring pressor. Refer to 8-6 (Outdoor power circuit to 1.0A during compressor operation.
  • Page 17 Abnormal point and detection method Judgment and action Error Code Case Freezing/overheating protection is working (1)Freezing protection Check water piping. Reduced water flow Abnormal if plate heat exchanger pipe · Clogged filter temperature(TH6) stays at -5 or lower ·...
  • Page 18 Abnormal point and detection method Judgment and action Error Code Case Inlet water temperature Reduced water flow Check water piping. Abnormal if the following conditions are · Clogged filter detected for continuously 10 seconds. · Leak of water Low temperature 1.Cooling mode ·...
  • Page 19 8-4. HOW TO CHECK THE PARTS PUHZ-W90VHA Parts name Check points TH3:Liquid pipe Disconnect the connector then measure the resistance using a tester. temperature (At the ambient temperature of 10 ~30 ) TH4:Discharge Normal Abnormal temperature TH6:Plate Hex liquid 160k ~410k...
  • Page 20 Check method of DC fan motor (fan motor / outdoor controller circuit board) Notes · High voltage is applied to the connector (CNF1) for the fan motor. Give attention to the service. · Do not pull out the connector (CNF1) of the motor with the power supply on. (It may damage of the outdoor controller circuit board and fan motor.) Self check...
  • Page 21 8-5. HOW TO CHECK THE COMPONENTS Low temperature thermistors • Thermistor (TH3) • Thermistor (TH6) • Thermistor (TH7) Thermistor R0 = 15k ± 3% B constant = 3480 ± 2% =15exp{3480( 273+t –...
  • Page 22 Low temperature thermistor • Thermistor (TH32) Thermistor R0 = 15k ± 2.5% B constant = 3450 ± 2% =15exp{3450( 273+t – 273 )} 4.2k 9.6k 2.9k 6.3k 5.1k -20 -10 10 20 30 40 50 Temperature( )

  • Page 23: Linear Expansion Valve

    Linear expansion valve (1) Operation summary of the linear expansion valve • Linear expansion valve open/close 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. ...
  • Page 24 (3) How to attach and detach the coil of linear expansion valve Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Main body Coil Lead wire Stopper 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 25: Test Point Diagram Outdoor Controller Circuit Board

    8-6. TEST POINT DIAGRAM Outdoor controller circuit board Not used : DC280V-380V CNDC DC280V-380V – outdoor power circuit board. of C5B): DC 0V (when CNAC stopped), DC 1– 6.5V : Power supply (when operated) for outdoor controller circuit board (220V-240V AC) : Not used pins of PC5D, pin 3 and pin 4)
  • Page 26 Outdoor noise filter circuit board LO, NO Voltage of 220-240V AC is output. Connect to the outdoor power circuit board (TABS, TABT). CNAC1, CNAC2 Connect to the 220-240V AC earth. Connect to the out- door controller cir- cuit board (CNAC). Input current Connect to the outdoor power...
  • Page 27 Outdoor power circuit board Brief Check of POWER MODULE 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 28 Interface circuit board CNIF1 Connect to the outdoor controller circuit board CNIF2 Connect to the outdoor controller circuit board CNIF3 Input signal Connect to the terminal block (TB2, TB3) CNIF4 Output signal Connect to the terminal block (TB3)
  • Page 29 Active filter module(ACTM) Connect to the outdoor power circuit board (TABP2) L1, L2 Connect to the DCL (Reactor) Non-connect Non-connect — Connect to the outdoor Connect to the Connect to the power circuit board outdoor power outdoor power (TABP1) circuit board circuit board (TABN1) (TABN2)
  • Page 30 8-7. OUTDOOR UNIT OPERATION MONITOR FUNCTION Operation indicator SW2 : Indicator change of self diagnosis SW2 setting Display detail Explanation for display Unit 2 3 4 5 6 (Be sure that the 1 to 6 in the SW2 are set to OFF.) (1) Display when the power supply is ON.
  • Page 31 Explanation for display Unit SW2 setting Display detail 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 32 Pulse (Example) When 150 pulse; 0.5 secs. 0.5secs. 2 secs. 2 3 4 5 6 Capacity settings Shown as the outdoor capacity code. Model Code PUHZ-W90VHA Code display 2 3 4 5 6...
  • Page 33 Explanation for display SW2 setting Display detail Unit – 39~88 Plate HEX liquid pipe temperature(TH6) (When the temperature is 0 or less, “–” and – 39~88 temperature are displayed by turns.) 2 3 4 5 6 Condensing temperature(T – 39~88 63HS –...
  • Page 34 Explanation for display Unit SW2 setting Display detail 0~500 Input current of outdoor unit (When it is 100 or more, hundreds digit, tens digit 0~500 and ones digit are displayed by turns.) 0.1 A 2 3 4 5 6 0~500 LEV-B opening pulse (When it is 100 pulse or more, hundreds digit, tens 0~500...
  • Page 35 Explanation for display Unit SW2 setting Display detail Operation frequency when error occured. 0~225 0~225 (When it is 100Hz or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 105Hz; 0.5 secs. 0.5secs. 2 secs. 2 3 4 5 6 Fan step when error occured.
  • Page 36 SW2 setting Display detail Explanation for display Unit Sub cool (SC) when error occured. 0~130 0~130 (When the temperature is 100°C or more, hundreds digit, tens digit and ones digit are displayed by Cooling:SC = T -TH3 turns.) 63HS Heating:SC = T -TH6 (Example) When 115°C;...
  • Page 37 All these dip switches on PUHZ-W90VHA are set as shown above. Spare PCBs, however, will be supplied without any settings, which means that all dip switches are switched OFF. When servicing, please make sure to set all switches correctly, referring to the previous PCB which is removed from the unit.

  • Page 38: Disassembly Procedure

    DISASSEMBLY PROCEDURE PUHZ-W90VHA OPERATING PROCEDURE PHOTOS&ILLUSTRATION Top panel fixing screws 1. Removing the service panel and top panel Figure 1 Top panel (1) Remove 3 screws (5x10) and slide the hook on the right downward to remove the service panel.
  • Page 39 OPERATING PROCEDURE PHOTOS&ILLUSTRATION Photo 4 4. Removing the thermistor (TH6) (1) Remove the service panel. (See figure 1.) (2) Remove the top panel. (See figure 1.) (3) Disconnect the connectors, TH6 and TH7 (red), on the Plate HEX liquid Outdoor liquid controller circuit board.

  • Page 40: Heating

    OPERATING PROCEDURE PHOTOS&ILLUSTRATION 8. Removing the solenoid valve coil (21S4) Photo 8 linear expansion valve coil (LEV (A), LEV (B)) and solenoid Solenoid Four-way valve LEV-A valve coil (SV) valve coil(21S4) (1) Remove the service panel. (See figure 1.) (2) Remove the top panel.
  • Page 41 OPERATING PROCEDURE PHOTOS&ILLUSTRATION 11. Removing the bypass valve Photo 10 (1) Remove the service panel. (See figure 1.) Solenoid (2) Remove the top panel. (See figure 1.) Four-way valve LEV-A LEV-B valve coil(21S4) (3) Remove the electrical parts box. (See photo 3.) (4) Remove 3 right side panel fixing screws (5x10) in the rear of the unit and remove the right side panel.
  • Page 42 OPERATING PROCEDURE PHOTOS&ILLUSTRATION Terminal cover 14. Removing the compressor (MC) Photo 11 (1) Remove the service panel. (See figure 1.) (2) Remove the top panel. (See figure 1.) (3) Remove 2 screws (5x10) and remove the front cover panel. (4) Remove 2 screws (5x10) and remove the back cover panel. (5) Remove the electrical parts box.
  • Page 43 OPERATING PROCEDURE PHOTOS&ILLUSTRATION 17. Removing the interface circuit board (I.F.) : Figure 2 Figure 2 Active filter module (ACTM) (1) Remove 2 Interface board cover fixing screws (4x10). (2) Remove all lead wire connectors (CNIF1, CNIF2, CNIF3, Electrical Power curcuit board (P.B.) CNIF4) on interface circuit board (I.F.).
  • Page 44 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN ©Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. New publication, effective Aug. 2007 Distributed in Aug. 2007 No. OCH419 PDF 8 Specifications subject to change without notice. Made in Japan...

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