AIR TO WATER HEAT PUMP August 2007 No. OCH419 SERVICE MANUAL R410A [model name] [Service Ref.] PUHZ-W90VHA 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.
1 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.
Unit Gravimeter [3] Service tools Use the below service tools as exclusive tools for R410A refrigerant. No. 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. Electronic scale Gas leak detector ·Use the detector for R134a, R407C or R410A. Adaptor for reverse flow check ·Attach on vacuum pump.
SPECIFICATIONS Power supply Phase Voltage Frequency Heating (A2/W35) Capacity COP Power input Nominal water flow Heating Capacity (A7/W35) COP Power input Nominal water flow Cooling Capacity (A35/W7) EER (COP) Power input Nominal water flow Cooling Capacity (A35/W18) EER (COP) Power input Nominal water flow Outdoor unit Model name Running current Max.
3 DATA 3-1. NOISE CRITERION CURVES MICROPHONE 1m UNIT 1.5m GROUND PUHZ-W90VHA MODE SPL(dB) COOLING 49 HEATING 49 LINE OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.
3-2. STANDARD OPERATION DATA Outdoor Water conditions conditions Refrigerant circuit Electrical circuit Total Mode Cooling (A35/W7) Heating (A7/W35) Capacity W 7,100 9,000 Input kW 3.55 2.31 Outdoor unit PUHZ-W90VHA Phase, Hz 1, 50 Voltage V Current A 15.7 10.3 Discharge pressure MPa 2.74 2.21 Suction pressure MPa 0.73 0.64 Discharge temperature 74 65 Condensing temperature 47 38 Suction temperature 3 -1 L/min 20.4 25.8 7 35 D.B. 35 7 W.B.
(4'' Water IN Air Intake Water OUT Handle for moving e Ov 0m r 0 m 0m m er 1 Ov 57 mm Over10 Service space m 00m r 10 er 3 Ove Ov Over 500 Over300 Handle for moving Handle for moving Side Air Intake Rear Air Intake FOUNDATION Please secure the unit firmly with 4 foundation (M10) bolts. (Bolts and washers must be purchased locally.) 30 Dimensions of space needed for service access are shown in the below diagram.
5 WIRING DIAGRAM PUHZ-W90VHA NAME Terminal Block Terminal Block Terminal Block Motor for Compressor Fan Motor Solenoid Valve Solenoid Valve High Pressure Switch High Pressure Sensor Thermistor Thermistor Thermistor Thermistor Thermistor Thermistor Electronic Expansion Valve Reactor Active Filter Module SYMBOL P.B. TABU/V/W TABS/T TABP1/P2 TABN1/N2 DS2, DS3 IPM N.F.
6 WIRING SPECIFICATIONS FIELD ELECTRICAL WIRING (power wiring specifications) Outdoor unit power supply Circuit rating Wiring Wire No. × size (mm2) Outdoor unit Circuit Breaker capacity ~/N (single), 50Hz, 230 V *1 25 A Outdoor unit power supply, earth Controller-Outdoor unit 3 × Min.4 *2 8 × Min.0.5 (polar) Outdoor unit L-N (single) AC 230 V Controller-Outdoor unit DC 12 V *1. A breaker with at least 3.0 mm contact separation in each pole shall be provided.
7 REFRIGERANT SYSTEM DIAGRAM PUHZ-W90VHA P-Sensor TH7 CHECK/V REV/V S/V TH3 CHECK/V CHECK/V Water OUT Distributor H/P SW Plate HEX Receiver TH4 TH8 Strainer (#100) P/B TH32 Strainer (#100) COMP LEV-B Water IN LEV-A TH6 Strainer(#100) Strainer(#100) Refrigerant flow in heating Refrigerant flow in cooling Symbol COMP H/P SW Plate HEX REV/V S/V CHECK/V P-Sensor P/B LEV-A LEV-B TH32 TH3 TH4 TH6 TH7 TH8 Receiver Detail Part name Compressor High pressure switch (63H) Plate Heat Exchanger Revers
8 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.
8-3. SELF-DIAGNOSIS ACTION TABLE Error Code None Abnormal point and detection method — Case No voltage is supplied to terminal block(TB1) of outdoor unit. a) Power supply breaker is turned off. b) Contact failure or disconnection of power supply terminal c) Open phase (L or N phase) Electric power is not supplied to power supply terminal of noise filter circuit board / outdoor power circuit board.
Error Code Abnormal point and detection method High pressure (High-pressure switch 63H activated) Abnormal if high-pressure switch 63H is activated ( + ) during compressor operation. + 4.15 MPa 63H: High-pressure switch U1 U2 U3 Judgment and action Case Decreased water flow ~ Check water circuit and repair the defect.
Error Code Abnormal point and detection method Open/short of outdoor unit thermistors (TH3, TH32, TH6, TH7, and TH8) Abnormal if open or short is detected during compressor operation. Open detection of thermistors TH3, TH32 and TH6 is not detected for 10 seconds to 10 minutes after compressor starting and 10 minutes after and during defrosting. +Check which unit has abnormality in its thermistor by switching the mode of SW2. (Refer to 8-7.
Error Code U7 U8 Abnormal point and detection method Too low superheat due to low discharge temperature Abnormal if discharge superheat is continuously detected -15 or less for 3 minutes even though linear expansion valve has minimum open pulse after compressor starts operating for 10 minutes. Outdoor fan motor The outdoor fan motor is considered to be abnormal if the rotational frequency of fan motor is abnormal when detected during operation.
Error Code Abnormal point and detection method UH Current sensor error or input current error ·Abnormal if current sensor detects –1.0A to 1.0A during compressor operation. (This error is ignored during test run.) ·Abnormal if input current is detected 32A or input current is detected 28A or more for 10 seconds continuously. Compressor overcurrent interruption Abnormal if overcurrent DC bus or compressor is detected after compressor starts operating for 30 seconds.
Error Code Abnormal point and detection method P6 Judgment and action Case Freezing/overheating protection is working (1)Freezing protection Abnormal if plate heat exchanger pipe temperature(TH6) stays at -5 or lower for 10 seconds or abnormal if plate heat exchanger pipe thermistor (TH6) stays at -2 or lower and compressor operation frequency is minimum for 5 minutes after compressor starts operating for 6 minutes. Check water piping.
Error Code Abnormal point and detection method Inlet water temperature Abnormal if the following conditions are detected for continuously 10 seconds. PE 1.Cooling mode During compressor operation TH32 < 3 2.Heating mode (exclude defrosting) During compressor operation TH32 < -10 Case Reduced water flow · Clogged filter · Leak of water Low temperature · Low-load · Low temperature inlet water Defective water pump Leakage or shortage of refrigerant 3.
8-4. HOW TO CHECK THE PARTS PUHZ-W90VHA Check points Parts name 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 TH4 160k ~410k TH6:Plate Hex liquid pipe temperature TH3 TH7:Ambient TH6 4.3k ~9.6k Open or short temperature TH7 TH8:Heatsink temperature TH32 4.4k ~9.
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 Symptom : The outdoor fan does not run. Check fuse (F5) on outdoor control circuit board. Is the fuse normal? No Replace fan motor.
8-5. HOW TO CHECK THE COMPONENTS 50 Low temperature thermistors • Thermistor (TH3) • Thermistor (TH6) • Thermistor (TH7) Resistance (k ) 40 Thermistor R0 = 15k ± 3% B constant = 3480 ± 2% 1 1 Rt =15exp{3480( 273+t – 273 )} 0 10 20 25 15k 9.6k 6.3k 5.2k 30 40 4.3k 3.
Low temperature thermistor 50 • Thermistor (TH32) Thermistor R0 = 15k ± 2.5% B constant = 3450 ± 2% 40 0 10 20 25 15k 9.6k 6.3k 5.1k 30 40 Resistance (k ) 1 1 Rt =15exp{3450( 273+t – 273 )} 4.2k 2.
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.
(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. Be sure to detach the coil holding main body firmly. Otherwise, pipes can bend due to pressure.
8-6. TEST POINT DIAGRAM Outdoor controller circuit board CNS Not used &$87,21! 7(67 32,17 LV KLJK YROWDJH VCC 7(67 32,17 ) YROWDJH EHWZHHQ SLQV RI & % '& 9 VDC 7(67 32,17 ) 63H +LJK SUHVVXUH VZLWFK YROWDJH EHWZHHQ SLQV RI & ( : DC280V-380V + CNDC DC280V-380V &RQQHFW IURP outdoor power circuit board. –} VSP(7(67 32,17 ) YROWDJH EHWZHHQ SLQV of C5B): DC 0V (when stopped), DC 1– 6.
Outdoor noise filter circuit board LO, NO Voltage of 220-240V AC is output. Connect to the outdoor power circuit board (TABS, TABT). E2 Connect to the earth. CNAC1, CNAC2 220-240V AC Connect to the outdoor controller circuit board (CNAC). CN5 Input current Connect to the outdoor power circuit board (CN5). EI Connect to the earth. LI, NI Voltage of 220-240V AC is input. Connect to the terminal block(TB1).
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. Check of diode bridge TABP1-TABS, TABN1-TABS, TABP1-TABT,TABN1-TABT 2.
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) 28
Active filter module(ACTM) P Connect to the outdoor power circuit board (TABP2) L1, L2 Connect to the DCL (Reactor) N1 Non-connect N2 Non-connect + Connect to the outdoor power circuit board (TABP1) — I0 Connect to the outdoor power circuit board (TABN2) Connect to the outdoor power circuit board (TABN1) 29
8-7. OUTDOOR UNIT OPERATION MONITOR FUNCTION Operation indicator SW2 : Indicator change of self diagnosis Explanation for display Display detail SW2 setting Unit ON 1 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. When the power supply is ON, blinking displays by turns. Wait for 10 seconds at the longest.
ON Explanation for display Display detail SW2 setting 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 ; 0.5 secs. 0.5secs. 2 secs. 1 2 3 4 5 6 Unit 10 3~217 (When the discharge thermistor detects 100 or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 105 ; 0.5 secs. 0.5secs. 2 secs.
SW2 setting ON Pipe temperature / Liquid(TH3) when error occured. – 40~90 1 2 3 4 5 6 ON Discharge temperature (TH4) when error occured. 3~217 1 2 3 4 5 6 ON Explanation for display Unit – 40~90 (When the coil thermistor detects 0 or below, “–” and temperature are displayed by turns.) (Example) When –15 ; 0.5 secs. 0.5secs. 2 secs. 15 3~217 (When the temperature is 100 or more, the hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 130 ; 0.5 secs. 0.5secs.
SW2 setting ON Explanation for display Display detail Plate HEX liquid pipe temperature(TH6) – 39~88 – 39~88 (When the temperature is 0 or less, “–” and temperature are displayed by turns.) Unit 1 2 3 4 5 6 ON Condensing temperature(T63HS) – 39~88 – 39~88 (When the temperature is 0 or less, “–” and temperature are displayed by turns.) 1 2 3 4 5 6 ON 0~150 (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.
SW2 setting ON Explanation for display Display detail Input current of outdoor unit 0~500 Unit 0~500 (When it is 100 or more, hundreds digit, tens digit and ones digit are displayed by turns.) 0.1 A 1 2 3 4 5 6 ON LEV-B opening pulse 0~500 0~500 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns.
SW2 setting ON 1 2 3 4 5 6 ON Explanation for display Display detail Operation frequency when error occured. 0~225 (When it is 100Hz or more, hundreds digit, tens digit 0~225 and ones digit are displayed by turns.) (Example) When 105Hz; 0.5 secs. 0.5secs. 2 secs. 1 05 Fan step when error occured. 0~10 Unit Hz 0~10 Step 1 2 3 4 5 6 ON 0~500 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 130 pulse; 0.5 secs. 0.5secs. 2 secs.
SW2 setting ON 1 2 3 4 5 6 ON Cooling:SC = T63HS-TH3 Heating:SC = T63HS-TH6 Compressor operation duration before the unit stops with error. 0~999 1 2 3 4 5 6 ON Maximum frequency when error occured. 0~150 1 2 3 4 5 6 ON Explanation for display Unit 0~130 (When the temperature is 100°C or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 115°C; 0.5 secs. 0.5secs. 2 secs. 1 15 Display detail Sub cool (SC) when error occured.
8-8. FUNCTION OF SWITCHES Switch mark No.
9 DISASSEMBLY PROCEDURE PUHZ-W90VHA OPERATING PROCEDURE PHOTOS&ILLUSTRATION 1. Removing the service panel and top panel (1) Remove 3 screws (5x10) and slide the hook on the right downward to remove the service panel. (2) Remove screws (3 for front, 3 for rear/5x10) of the top panel and remove it. Figure 1 Top panel fixing screws Top panel Slide Service panel Service panel fixing screws Fan grille Grille fixing screws 2.
PHOTOS&ILLUSTRATION OPERATING PROCEDURE 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 controller circuit board. (4) Loosen the clamps for the lead wire. (5) Pull out the thermistor (TH6) from the sensor holder.
PHOTOS&ILLUSTRATION OPERATING PROCEDURE 8. Removing the solenoid valve coil (21S4) linear expansion valve coil (LEV (A), LEV (B)) and solenoid valve coil (SV) (1) Remove the service panel. (See figure 1.) (2) Remove the top panel. (See figure 1.) (3) Remove the electrical parts box. (See photo 3.) [Removing the solenoid valve coil ] (4) Remove solenoid valve coil fixing screw(M4x6). (5) Remove the solenoid valve coil .
PHOTOS&ILLUSTRATION OPERATING PROCEDURE 11. Removing the bypass valve (1) Remove the service panel. (See figure 1.) (2) Remove the top panel. (See figure 1.) (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. (5) Remove the bypass valve solenoid coil. (6) Recover refrigerant. (7) Remove the welded part of bypass valve.
PHOTOS&ILLUSTRATION OPERATING PROCEDURE 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. (See photo 3.) (6) Remove 3 screws (4x10) and remove the stay. (See photo 9.) (7) Remove 3 screws (5x10) in the rear of the unit and remove the right side panel.
PHOTOS&ILLUSTRATION OPERATING PROCEDURE 17. Removing the interface circuit board (I.F.) : Figure 2 (1) Remove 2 Interface board cover fixing screws (4x10). (2) Remove all lead wire connectors (CNIF1, CNIF2, CNIF3, CNIF4) on interface circuit board (I.F.). (3) Remove interface circuit board from the C.B. base.(5 supports) Figure 2 Active filter module (ACTM) Electrical parts box Power curcuit board (P.B.) 18. Removing the controller circuit board (C.B.
HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN ©Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in Aug. 2007 No. OCH419 PDF 8 Made in Japan New publication, effective Aug. 2007 Specifications subject to change without notice.
