Mitsubishi Electric EHST20C-VM6HB Service Manual
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Mitsubishi Electric EHST20C-VM6HB Service Manual

Split-type, air to water heat pump
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See also: Service Manual , Operating Manual
SPLIT-TYPE, AIR TO WATER HEAT PUMP

SERVICE MANUAL

Outdoor unit

[Service ref.]
[Model Name]
PUHZ-SW75VHA.UK
PUHZ-SW75VHA
PUHZ-SW75VHAR4.UK
PUHZ-SW100VHA.UK
PUHZ-SW100VHA
PUHZ-SW100VHAR4.UK
PUHZ-SW100YHA.UK
PUHZ-SW100YHA
PUHZ-SW100YHAR3.UK
PUHZ-SW120VHA.UK
PUHZ-SW120VHA
PUHZ-SW120VHAR4.UK
PUHZ-SW120YHA.UK
PUHZ-SW120YHA
PUHZ-SW120YHAR3.UK
Salt proof model
PUHZ-SW75VHA-BS.UK
PUHZ-SW75VHA-BS
PUHZ-SW75VHAR4-BS.UK
PUHZ-SW100VHA-BS.UK
PUHZ-SW100VHA-BS
PUHZ-SW100VHAR4-BS.UK
PUHZ-SW100YHA-BS
PUHZ-SW100YHA-BS.UK
PUHZ-SW100YHAR3-BS.UK PUHZ-SW100YHAR4-BS.UK
PUHZ-SW120VHA-BS.UK
PUHZ-SW120VHA-BS
PUHZ-SW120VHAR4-BS.UK
PUHZ-SW120YHA-BS.UK
PUHZ-SW120YHA-BS
PUHZ-SW120YHAR3-BS.UK PUHZ-SW120YHAR4-BS.UK
PUHZ-SW75VHA.UK
PUHZ-SW75VHA-BS.UK
R410A
PUHZ-SW75VHAR3.UK
PUHZ-SW100VHAR3.UK
PUHZ-SW100YHAR1.UK
PUHZ-SW100YHAR4.UK
PUHZ-SW120VHAR3.UK
PUHZ-SW120YHAR1.UK
PUHZ-SW120YHAR4.UK
PUHZ-SW75VHAR3-BS.UK
PUHZ-SW100VHAR3-BS.UK
PUHZ-SW100YHAR1-BS.UK
PUHZ-SW120VHAR3-BS.UK
PUHZ-SW120YHAR1-BS.UK
CONTENTS
1. TECHNICAL CHANGES ................................ 2
2. REFERENCE MANUAL ................................. 3
3. SAFETY PRECAUTION ................................. 4
4. FEATURES ..................................................... 8
5. SPECIFICATIONS .......................................... 9
6. DATA ............................................................. 13
7. OUTLINES AND DIMENSIONS ................... 15
8. WIRING DIAGRAM ...................................... 17
9. WIRING SPECIFICATIONS .......................... 24
10. REFRIGERANT SYSTEM DIAGRAM .............. 25
11. TROUBLESHOOTING .................................. 27
12. DISASSEMBLY PROCEDURE ..................... 82
PARTS CATALOG (OCB533)
August 2015
No. OCH533
REVISED EDITION-D
Revision:
• Added
PUHZ-SW75VHAR4.UK,
PUHZ-SW75VHAR4-BS.UK,
PUHZ-SW100VHAR4.UK,
PUHZ-SW100VHAR4-BS.UK,
PUHZ-SW100YHAR4.UK,
PUHZ-SW100YHAR4-BS.UK,
PUHZ-SW120VHAR4.UK,
PUHZ-SW120VHAR4-BS. UK,
PUHZ-SW120YHAR4.UK and
PUHZ-SW120YHAR4-BS.UK
in REVISED EDITION-D.
• Some descriptions have
been modified.
• Please void OCH533
REVISED EDITION-C.
Note:
• This manual describes
service data of the outdoor
units only.

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Summary of Contents for Mitsubishi Electric EHST20C-VM6HB

  • Page 1: Service Manual

    SPLIT-TYPE, AIR TO WATER HEAT PUMP August 2015 No. OCH533 REVISED EDITION-D SERVICE MANUAL R410A Outdoor unit [Service ref.] [Model Name] Revision: PUHZ-SW75VHA.UK PUHZ-SW75VHAR3.UK PUHZ-SW75VHA • Added PUHZ-SW75VHAR4.UK, PUHZ-SW75VHAR4.UK PUHZ-SW75VHAR4-BS.UK, PUHZ-SW100VHA.UK PUHZ-SW100VHAR3.UK PUHZ-SW100VHA PUHZ-SW100VHAR4.UK, PUHZ-SW100VHAR4.UK PUHZ-SW100VHAR4-BS.UK, PUHZ-SW100YHA.UK PUHZ-SW100YHAR1.UK PUHZ-SW100YHA PUHZ-SW100YHAR4.UK, PUHZ-SW100YHAR3.UK PUHZ-SW100YHAR4.UK PUHZ-SW100YHAR4-BS.UK,...

  • Page 2: Technical Changes

    TECHNICAL CHANGES Service ref. have been changed as follows. PUHZ-SW75VHAR3(-BS).UK PUHZ-SW75VHAR4(-BS).UK PUHZ-SW100VHAR3(-BS).UK PUHZ-SW100VHAR4(-BS).UK PUHZ-SW100YHAR3(-BS).UK PUHZ-SW100YHAR4(-BS).UK PUHZ-SW120VHAR3(-BS).UK PUHZ-SW120VHAR4(-BS).UK PUHZ-SW120YHAR3(-BS).UK PUHZ-SW120YHAR4(-BS).UK • A compliance with ErP directive Lot 1 has been authorized. • All circuit boards (C.B./P.B./N.F./CONV.B) have been changed (including a change of production site). PUHZ-SW75VHA(-BS).UK PUHZ-SW75VHAR3(-BS).UK PUHZ-SW100VHA(-BS).UK...

  • Page 3: Reference Manual

    REFERENCE MANUAL INDOOR UNIT SERVICE MANUAL Model name Service ref. Service manual No. EHST20C-VM6HB EHST20C-VM6HB.UK EHST20C-YM9HB EHST20C-YM9HB.UK EHST20C-TM9HB EHST20C-TM9HB.UK EHST20C-VM2B EHST20C-VM2B.UK EHST20C-VM6B EHST20C-VM6B.UK OCH531 EHST20C-YM9B EHST20C-YM9B.UK EHST20C-VM6EB EHST20C-VM6EB.UK EHST20C-YM9EB EHST20C-YM9EB.UK EHST20C-VM6SB EHST20C-VM6SB.UK EHSC-VM2B EHSC-VM2B.UK EHSC-VM6B EHSC-VM6B.UK EHSC-YM9B EHSC-YM9B.UK EHSC-TM9B EHSC-TM9B.UK...

  • Page 4: Safety Precaution

    SAFETY PRECAUTION 3-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must disconnected. Preparation before the repair service. Precautions during the repair service. • Do not perform the work involving the electric parts with wet hands. •...
  • Page 5 [1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) When performing service, install a filter drier simultaneously. Be sure to use a filter drier for new refrigerant.
  • Page 6 3-3. PRECAUTIONS WHEN REUSING EXISTING R22 REFRIGERANT PIPES Flowchart • Refer to the flowchart below to determine if the existing pipes can be used and if it is necessary to use a filter dryer. • If the diameter of the existing pipes is different from the specified diameter, refer to technological data materials to confirm if the pipes can be used. Measure the existing pipe thickness and check for damage.
  • Page 7 Cautions for refrigerant piping work New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working pressure of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.

  • Page 8: Features

    FEATURES PUHZ-SW100VHA PUHZ-SW75VHA PUHZ-SW100YHA PUHZ-SW75VHA-BS PUHZ-SW120VHA PUHZ-SW120YHA PUHZ-SW100VHA-BS PUHZ-SW100YHA-BS PUHZ-SW120VHA-BS PUHZ-SW120YHA-BS CHARGELESS SYSTEM PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT. (Maximum 10 m (PUHZ-SW75–120)) The refrigerant circuit with LEV (Linear Expansion Valve) and accumulator always control the optimal refrigerant level regard- less of the length (10 m maximum and 5 m minimum) of piping.
  • Page 9 SPECIFICATIONS <Reference data> Plate heat exchanger (ACH70-40 plates) PUHZ-SW75VHA(-BS).UK PUHZ-SW120VHA(-BS).UK PUHZ-SW120VHAR3(-BS).UK PUHZ-SW75VHAR3(-BS).UK PUHZ-SW120YHA(-BS).UK PUHZ-SW120YHAR1/R3(-BS).UK Nominal water flow L/min 22.9 Nominal water flow L/min 45.9 Heating Heating Capacity 8.00 Capacity 16.0 (A7/W35) (A7/W35) 4.40 4.10 Power input 1.82 Power input 3.90 Heating Heating Capacity...

  • Page 10: Nominal Water Flow L/Min

    PUHZ-SW120VHAR4(-BS).UK PUHZ-SW75VHAR4(-BS).UK PUHZ-SW120YHAR4(-BS).UK Nominal water flow L/min 45.9 Nominal water flow L/min 22.9 Heating Heating Capacity 16.0 Capacity 8.00 (A7/W35) (A7/W35) 4.40 4.10 Power input 1.82 Power input 3.90 Heating Heating Capacity 8.00 Capacity 16.0 (A7/W45) (A7/W45) 3.40 3.23 Power input 2.35 Power input 4.95...
  • Page 11 PUHZ-SW75VHA.UK PUHZ-SW75VHAR3.UK Service Ref. PUHZ-SW75VHA-BS.UK PUHZ-SW75VHAR3-BS.UK Power supply (phase, cycle, voltage) Single, 50Hz, 230V Max. current Munsell 3Y 7.8/1.1 External finish Refrigerant control Linear Expansion Valve Compressor Hermetic TNB220FLHMT Model Motor output Starter type Inverter HP switch Protection devices Comp. surface thermo Discharge thermo Over current detection Crankcase heater...
  • Page 12 PUHZ-SW100VHA.UK PUHZ-SW120VHA.UK Service Ref. PUHZ-SW100VHAR3.UK PUHZ-SW120VHAR3.UK PUHZ-SW120VHAR4.UK PUHZ-SW100VHAR4.UK PUHZ-SW120VHA-BS.UK PUHZ-SW100VHA-BS.UK PUHZ-SW120VHAR3-BS.UK PUHZ-SW100VHAR3-BS.UK PUHZ-SW120VHAR4-BS.UK PUHZ-SW100VHAR4-BS.UK Power supply (phase, cycle, voltage) Single 50Hz, 230V Max. current 29.5 External finish Munsell 3Y 7.8/1.1 Refrigerant control Linear Expansion Valve Compressor Hermetic Model ANB42FNEMT ANB33FNEMT Motor output Starter type Inverter...

  • Page 13: Data

    DATA 6-1. REFILLING REFRIGERANT CHARGE (R410A : kg) Piping length (one way) Initial Service Ref. 10 m 20 m 30 m 40 m 50 m 60 m 75 m charged PUHZ-SW75VHA(-BS).UK — — — PUHZ-SW75VHAR3(-BS).UK PUHZ-SW75VHAR4(-BS).UK 3.35 — — — PUHZ-SW100VHA(-BS).UK PUHZ-SW100VHAR3(-BS).UK PUHZ-SW100YHA(-BS).UK...
  • Page 14 6-3. NOISE CRITERION CURVES PUHZ-SW75VHA(-BS).UK SPL(dB) MODE LINE PUHZ-SW75VHAR3(-BS).UK COOLING PUHZ-SW75VHAR4(-BS).UK HEATING MICROPHONE UNIT NC-70 1.5m NC-60 NC-50 GROUND NC-40 NC-30 APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz PUHZ-SW100VHA(-BS).UK PUHZ-SW120VHA(-BS).UK PUHZ-SW100VHAR3(-BS).UK PUHZ-SW120VHAR3(-BS).UK PUHZ-SW100VHAR4(-BS).UK PUHZ-SW120VHAR4(-BS).UK...

  • Page 15: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PUHZ-SW75VHA.UK PUHZ-SW75VHAR3.UK PUHZ-SW75VHAR4.UK PUHZ-SW75VHA-BS.UK PUHZ-SW75VHAR3-BS.UK PUHZ-SW75VHAR4-BS.UK Unit : mm OCH533D...
  • Page 16 PUHZ-SW100VHA.UK PUHZ-SW100VHAR3.UK PUHZ-SW100VHAR4.UK PUHZ-SW100VHA-BS.UK PUHZ-SW100VHAR3-BS.UK PUHZ-SW100VHAR4-BS.UK PUHZ-SW100YHA.UK PUHZ-SW100YHAR1.UK PUHZ-SW100YHAR3.UK PUHZ-SW100YHAR4.UK PUHZ-SW100YHA-BS.UK PUHZ-SW100YHAR1-BS.UK PUHZ-SW100YHAR3-BS.UK PUHZ-SW100YHAR4-BS.UK PUHZ-SW120VHA.UK PUHZ-SW120VHAR3.UK PUHZ-SW120VHAR4.UK PUHZ-SW120VHA-BS.UK PUHZ-SW120VHAR3-BS.UK PUHZ-SW120VHAR4-BS.UK PUHZ-SW120YHA.UK PUHZ-SW120YHAR1.UK PUHZ-SW120YHAR3.UK PUHZ-SW120YHAR4.UK PUHZ-SW120YHA-BS.UK PUHZ-SW120YHAR1-BS.UK PUHZ-SW120YHAR3-BS.UK PUHZ-SW120YHAR4-BS.UK Unit : mm OCH533D...

  • Page 17: Wiring Diagram

    WIRING DIAGRAM PUHZ−SW75VHA WIRING DIAGRAM BH79B652H01 PUHZ-SW75VHA.UK PUHZ-SW75VHAR3.UK PUHZ-SW75VHA-BS.UK PUHZ-SW75VHAR3-BS.UK SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block <Power Supply, Indoor/Outdoor> P. B. Power Circuit Board Switch <Function Switch, Model Select> Motor for Compressor R, S Connection Terminal <L/N-Phase> Switch <Model Select> Fan Motor U, V, W Connection Terminal <U/V/W-Phase>...
  • Page 18 PUHZ-SW75VHAR4.UK PUHZ-SW75VHAR4-BS.UK SYMBOL NAME SYMBOL NAME Terminal Block <Power Supply, Indoor/Outdoor> C. B. Controller Circuit Board Motor for Compressor F1, F2, F3, F4 Fuse <T6.3AL250V> Fan Motor Switch <Manual Defrost, Defect History Record Reset, 21S4 Solenoid Valve (4-Way Valve) Refrigerant Address> High Pressure Switch Switch <Function Switch>...
  • Page 19 PUHZ-SW100VHA.UK PUHZ-SW100VHAR3.UK PUHZ−SW100/120VHA WIRING DIAGRAM BH79B653H01 PUHZ-SW100VHA-BS.UK PUHZ-SW100VHAR3-BS.UK PUHZ-SW120VHA.UK PUHZ-SW120VHAR3.UK PUHZ-SW120VHA-BS.UK PUHZ-SW120VHAR3-BS.UK SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block <Power Supply, Indoor/Outdoor> P. B. Power Circuit Board Switch <Function Switch> Motor for Compressor U, V, W Connection Terminal <U/V/W-Phase> Switch <Function Switch>...
  • Page 20 PUHZ-SW100VHAR4.UK PUHZ-SW120VHAR4.UK PUHZ-SW100VHAR4-BS.UK PUHZ-SW120VHAR4-BS.UK SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block <Power Thermistor <Ambient> Switch <Function Switch, Model Select > Supply, Indoor/Outdoor> Thermistor internal <Heat Sink> Switch <Model Select > Motor for Compressor TH34 Thermistor <Comp. Surface> Switch <Function Switch > *1 MODEL SELECT The black square ( ) indicates a switch position.
  • Page 21 PUHZ-SW100/120YHA WIRING DIAGRAM BH79B654H01 PUHZ-SW100YHA.UK PUHZ-SW120YHA.UK PUHZ-SW100YHA-BS.UK PUHZ-SW120YHA-BS.UK SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block <Power Supply> P. B. Power Circuit Board C. B. Controller Circuit Board Terminal Block <Indoor/Outdoor> TB-U/V/W Switch <Manual Defrost, Defect History, Connection Terminal <U/V/W-Phase> Motor for Compressor TB-L1/L2/L3 Connection Terminal <L1/L2/L3-Power Supply>...
  • Page 22 PUHZ-SW100/120YHA WIRING DIAGRAM PUHZ-SW100YHAR1.UK PUHZ-SW100YHAR3.UK PUHZ-SW100YHAR1-BS.UK PUHZ-SW100YHAR3-BS.UK PUHZ-SW120YHAR1.UK PUHZ-SW120YHAR3.UK PUHZ-SW120YHAR1-BS.UK PUHZ-SW120YHAR3-BS.UK SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block <Power Supply> P. B. Power Circuit Board C. B. Controller Circuit Board Terminal Block <Indoor/Outdoor> TB-U/V/W Connection Terminal <U/V/W-Phase> Switch <Manual Defrost, Defect History, Motor for Compressor TB-L1/L2/L3 Record Reset, Refrigerant Address>...
  • Page 23 PUHZ-SW100YHAR4.UK PUHZ-SW120YHAR4.UK PUHZ-SW100YHAR4-BS.UK PUHZ-SW120YHAR4-BS.UK SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block <Power Supply> TH34 Thermistor <Comp. Surface> Switch <Function Switch > Terminal Block <Indoor/Outdoor> LEV-A, LEV-B Linear Expansion Valve Switch <Function Switch, Model Select > Motor for Compressor ACL1, ACL2, Switch <Model Select >...

  • Page 24: Wiring Specifications

    WIRING SPECIFICATIONS FIELD ELECTRICAL WIRING (power wiring specifications) SW75V SW100V SW120V SW100, 120Y Outdoor unit model ~/N (single), ~/N (single), ~/N (single), 3N~ (3 ph 4-wires), Outdoor unit power supply 50 Hz, 230 V 50 Hz, 230 V 50 Hz, 230 V 50 Hz, 400 V Outdoor unit input capacity Main switch (Breaker) 25 A...

  • Page 25: Refrigerant System Diagram

    Strainer #100 #100 Detail Symbol Part name COMP Compressor DC inverter twin rotary compressor (Mitsubishi Electric Corporation) H/P SW High pressure switch (63H) For protection (OFF:4.15MPa) L/P SW Low pressure switch (63L) For protection (OFF:-0.03MPa) (SW100/120) REV/V Reversing (4-way) valve (21S4)
  • Page 26 10-1. REFRIGERANT COLLECTING (PUMP DOWN) When relocating or disposing of the indoor/outdoor unit, pump down the system following the procedure below so that no refriger- ant is released into the atmosphere. 1 Turn off the power supply (circuit breaker). 2 Connect the low-pressure valve on the gauge manifold to the charge plug (lowpressure side) on the outdoor unit. 3 Close the liquid stop valve completely.

  • Page 27: Troubleshooting

    TROUBLESHOOTING 11-1. TROUBLESHOOTING <Check code displayed by self-diagnosis and actions to be taken for service (summary)> Present and past check codes are logged, and they can be displayed on the control board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summarized in the table below. Check the contents below before investigating details.
  • Page 28 11-2. SELF-DIAGNOSIS ACTION TABLE <Abnormalities detected when the power is turned on> Note: Refer to indoor unit section for code P and code E. Check code Abnormal point and detection method Judgment and action Case 1 No voltage is supplied to terminal 1 Check following items.
  • Page 29 Check code Abnormal point and detection method Case Judgment and action 2 connector open (SW100/120 only) 1 Check connection of connector (63H,63L) on 1 Disconnection or contact failure Abnormal if both 63H and 63L connector of connector (63H,63L) on outdoor controller circuit board. circuits are open for three minutes outdoor controller circuit board Refer to "11-6.
  • Page 30 <Abnormalities detected while unit is operating> Abnormal point and detection method Judgment and action Check code Case High pressure (High-pressure switch 1 Defective operation of stop 1 Check if stop valve is fully open. 63H operated) valve (Not fully open) Abnormal if high-pressure switch 63H 2 Clogged or broken pipe 2 Check piping and repair defect.
  • Page 31 Abnormal point and detection method Judgment and action Check code Case Open/short of outdoor unit thermistors 1 Disconnection or contact failure 1 Check connection of connector (TH3, TH7/6) on the (TH3, TH6, TH7, and TH8) of connectors outdoor controller circuit board. Check connection Abnormal if open or short is detected Outdoor controller circuit board: of connector (CN3) on the outdoor power circuit...
  • Page 32 Check Code Abnormal point and detection method Judgment and action Case To find out the details about U9 error, turn ON SW2-1, 2-2, 2-3, 2-4, 2-5 and 2-6 when U9 error occurs. Detailed To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2 and 2-6. codes Refer to "11-7.
  • Page 33 Check Code Abnormal point and detection method Judgment and action Case PFC error (Overvoltage/ 1 Abnormal increase in power 12 Check the field facility for the power Detailed codes Undervoltage/Overcurrent) source voltage supply. 3 Correct the wiring (U . V . W phase) to •...
  • Page 34 Check Code Abnormal point and detection method Judgment and action Case Compressor overcurrent interruption 1 Stop valve of outdoor unit is 1 Open stop valve. Abnormal if overcurrent DC bus or closed. compressor is detected after compressor 2 Decrease of power supply 2 Check facility of power supply.
  • Page 35 Check code Abnormal point and detection method Judgment and action Case Remote controller transmission error (E3)/ 1 2 remote controller are set as 1 Set a remote controller to main, and the signal receiving error (E5) “main.” other to sub. 1 Abnormal if remote controller could not (In case of 2 remote controllers) find blank of transmission path for 6...
  • Page 36 Check Code Abnormal point and detection method Judgment and action Case Freezing/overheating protection is working 1 Overcharge of refrigerant 12 Check operating condition of refrigerant Overheating protection <Heating mode> circuit. 2 Defective refrigerant circuit (clogs) Abnormal if condensing temperature of 3 Malfunction of linear expansion valve pressure sensor (63HS) detects 4 Reduced water flow...
  • Page 37 Factor Phenomena Countermeasure 3. When pressing the remote controller 1 After cancelling to select function from the remote 1 Normal operation operation switch, the OPERATION controller, the remote controller operation switch will display is appeared but it will be be not accepted for approx. 30 seconds. turned off soon.
  • Page 38 Phenomena Countermeasure A flowing water sound or occasional hissing sound is heard. ■ These sounds can be heard when refrigerant and/or water is (are) flowing in the in- door unit or refrigerant pipe, or when the refrigerant and/or water is (are) chugging. ■...
  • Page 39 Symptoms: “PLEASE WAIT” is kept being displayed on the remote controller. Inspection method and Cause Diagnosis flow troubleshooting Check the display time of “PLEASE WAIT” after turning on the main power. 6 minutes 2 minutes or more or less How long is “PLEASE WAIT” •...
  • Page 40 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller. 1 LED1 : LED2 : LED3 : Inspection method and Diagnosis flow Cause troubleshooting Check the voltage between S1 and S2 on the terminal block (TB4) of the indoor unit which is used to connect the indoor unit and the outdoor unit.
  • Page 41 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller. 2 LED1 : LED2 : LED3 : Inspection method and Diagnosis flow Cause troubleshooting Check the voltage between S1 and S2 on the terminal block (TB4) of the indoor unit which is used to connect the indoor unit and the outdoor unit.
  • Page 42 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller. 3 LED1 : LED2 : LED3 : — Inspection method and Diagnosis flow Cause troubleshooting Check the voltage of the terminal block (TB6) of the remote controller. 10 to 16 V DC? •...
  • Page 43 11-4. HOW TO CHECK THE PARTS PUHZ-SW75VHA.UK PUHZ-SW75VHAR3.UK PUHZ-SW75VHAR4.UK PUHZ-SW75VHA-BS.UK PUHZ-SW75VHAR3-BS.UK PUHZ-SW75VHAR4-BS.UK PUHZ-SW100VHA.UK PUHZ-SW100VHAR3.UK PUHZ-SW100VHAR4.UK PUHZ-SW100VHA-BS.UK PUHZ-SW100VHAR3-BS.UK PUHZ-SW100VHAR4-BS.UK PUHZ-SW100YHA.UK PUHZ-SW100YHAR1.UK PUHZ-SW100YHAR3.UK PUHZ-SW100YHAR4.UK PUHZ-SW100YHA-BS.UK PUHZ-SW100YHAR1-BS.UK PUHZ-SW100YHAR3-BS.UK PUHZ-SW100YHAR4-BS.UK PUHZ-SW120VHA.UK PUHZ-SW120VHAR3.UK PUHZ-SW120VHAR4.UK PUHZ-SW120VHA-BS.UK PUHZ-SW120VHAR3-BS.UK PUHZ-SW120VHAR4-BS.UK PUHZ-SW120YHA.UK PUHZ-SW120YHAR1.UK PUHZ-SW120YHAR3.UK PUHZ-SW120YHAR4.UK PUHZ-SW120YHA-BS.UK PUHZ-SW120YHAR1-BS.UK PUHZ-SW120YHAR3-BS.UK PUHZ-SW120YHAR4-BS.UK Parts name Check points Thermistor (TH3)
  • Page 44 Check method of DC fan motor (fan motor/outdoor controller circuit board) Notes · High voltage is applied to the connecter (CNF1, 2) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNF1, 2) for the motor with the power supply on. board and fan motor.) (It causes trouble of the outdoor controller circuit Self check...
  • Page 45 <Thermistor feature chart> Low temperature thermistors • Thermistor <Liquid> (TH3) • Thermistor <2-phase pipe> (TH6) • Thermistor <Ambient> (TH7) Thermistor R0 = 15 k" ± 3% B constant = 3480 ± 2% =15exp{3480( – 273+t 15 k" 4.3 k" 9.6 k" 3.0 k"...
  • Page 46 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 47 (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 48 11-6. TEST POINT DIAGRAM Outdoor controller circuit board PUHZ-SW75VHA(-BS).UK PUHZ-SW75VHAR3(-BS).UK PUHZ-SW100VHA(-BS).UK PUHZ-SW100VHAR3(-BS).UK PUHZ-SW120VHA(-BS).UK PUHZ-SW120VHAR3(-BS).UK PUHZ-SW100YHA(-BS).UK PUHZ-SW120YHA(-BS).UK PUHZ-SW100YHAR1(-BS).UK PUHZ-SW100YHAR3(-BS).UK PUHZ-SW120YHAR1(-BS).UK PUHZ-SW120YHAR3(-BS).UK CNDC 280–380 V DC Connect from outdoor power circuit board for VHA, connect from noise filter board for (TEST POINT 1) (TEST POINT 2) (CNDC) (voltage between pins of C5E)
  • Page 49 Outdoor controller circuit board PUHZ-SW75VHAR4.UK PUHZ-SW100VHAR4.UK PUHZ-SW120VHAR4.UK PUHZ-SW75VHAR4-BS.UK PUHZ-SW100VHAR4-BS.UK PUHZ-SW120VHAR4-BS.UK PUHZ-SW100YHAR4.UK PUHZ-SW120YHAR4.UK PUHZ-SW100YHAR4-BS.UK PUHZ-SW120YHAR4-BS.UK CNDC 280–380 V DC Connect from outdoor <CAUTION> TEST POINT1 is high voltage. power circuit board for VHA, connect (TEST POINT 1) (CNDC) from noise filter board for YHA (voltage between pins of C5E) : 250–380 V DC –...
  • Page 50 Outdoor noise filter circuit board PUHZ-SW75VHA.UK PUHZ-SW75VHA-BS.UK PUHZ-SW75VHAR3.UK PUHZ-SW75VHAR3-BS.UK EI, E2 Connect to the earth LI, NI Voltage of 230 V AC is input. (Connect to the terminal block (TB1)) Connect to CNAC1, CNAC2 the earth 230 V AC (Connect to the outdoor controller circuit board (CNAC))
  • Page 51 Outdoor noise filter circuit board PUHZ-SW100YHA.UK PUHZ-SW120YHA.UK PUHZ-SW100YHA-BS.UK PUHZ-SW120YHA-BS.UK PUHZ-SW100YHAR1.UK PUHZ-SW100YHAR3.UK PUHZ-SW100YHAR1-BS.UK PUHZ-SW100YHAR3-BS.UK PUHZ-SW120YHAR1.UK PUHZ-SW120YHAR3.UK PUHZ-SW120YHAR1-BS.UK PUHZ-SW120YHAR3-BS.UK LI1, LI2, LI3, NI POWER SUPPLY LI1-LI2/LI-LI3/LI3-LI1 : 400 V AC input LI1-NI/LI2-NI/LI3-NI : 230 V AC input (Connect to the terminal block (TB1)) Connect to the earth Connect to the earth CNAC2...
  • Page 52 Outdoor noise filter circuit board PUHZ-SW100YHAR4.UK PUHZ-SW120YHAR4.UK PUHZ-SW100YHAR4-BS.UK PUHZ-SW120YHAR4-BS.UK LI1, LI2, LI3, NI POWER SUPPLY LI1-LI2/LI-LI3/LI3-LI1 : 400 V AC input LI1-NI/LI2-NI/LI3-NI : 230 V AC input (Connect to the terminal block (TB1)) Connect to the earth CNAC1, CNAC2 230 V AC (Connect to the Connect to the earth outdoor controller...
  • Page 53 Outdoor power circuit board Brief Check of DIP-IPM and DIP-PFC PUHZ-SW75VHA.UK Usually, they are in a state of being short-circuited if they are broken. Measure the resistance in the following points (connectors, etc.). PUHZ-SW75VHAR3.UK If they are short-circuited, it means that they are broken. PUHZ-SW75VHA-BS.UK 1.
  • Page 54 Outdoor power circuit board Brief Check of DIP-IPM and D.B. PUHZ-SW75VHAR4.UK 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 PUHZ-SW75VHAR4-BS.UK are short-circuited, it means that they are broken. 1.
  • Page 55 Outdoor power circuit board Brief Check of POWER MODULE Usually, they are in a state of being short-circuited if they are broken. PUHZ-SW100VHA.UK Measure the resistance in the following points (connectors, etc.). PUHZ-SW100VHAR3.UK If they are short-circuited, it means that they are broken. 1.
  • Page 56 Outdoor power circuit board Brief Check of POWER MODULE Usually, they are in a state of being short-circuited if they are broken. PUHZ-SW100VHAR4.UK Measure the resistance in the following points (connectors, etc.). PUHZ-SW120VHAR4.UK If they are short-circuited, it means that they are broken. PUHZ-SW100VHAR4-BS.UK 1.
  • Page 57 Outdoor power circuit board Brief Check of POWER MODULE Usually, they are in a state of being short-circuited if they are broken. PUHZ-SW100YHA.UK Measure the resistance in the following points (connectors, etc.). PUHZ-SW120YHA.UK If they are short-circuited, it means that they are broken. 1.
  • Page 58 Outdoor power circuit board Brief Check of POWER MODULE Usually, they are in a state of being short-circuited if they are broken. PUHZ-SW100YHAR1.UK Measure the resistance in the following points (connectors, etc.). PUHZ-SW100YHAR3.UK If they are short-circuited, it means that they are broken. 1.
  • Page 59 Outdoor converter circuit board PUHZ-SW100YHA.UK PUHZ-SW100YHAR1.UK PUHZ-SW100YHAR3.UK PUHZ-SW100YHA-BS.UK PUHZ-SW100YHAR1-BS.UK PUHZ-SW100YHAR3-BS.UK PUHZ-SW120YHA.UK PUHZ-SW120YHAR1.UK PUHZ-SW120YHAR3.UK PUHZ-SW120YHA-BS.UK PUHZ-SW120YHAR1-BS.UK PUHZ-SW120YHAR3-BS.UK 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)
  • Page 60 Outdoor converter circuit board PUHZ-SW100YHAR4.UK PUHZ-SW120YHAR4.UK PUHZ-SW100YHAR4-BS.UK PUHZ-SW120YHAR4-BS.UK L1-IN, N-IN L1-A1 CK-OU Connect to the noise filter Connect to the ACL1 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...
  • Page 61 11-7. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS (1) Function of switches PUHZ-SW75VHA.UK PUHZ-SW75VHAR3.UK PUHZ-SW75VHA-BS.UK PUHZ-SW75VHAR3-BS.UK PUHZ-SW100VHA.UK PUHZ-SW100VHAR3.UK PUHZ-SW100VHA-BS.UK PUHZ-SW100VHAR3-BS.UK PUHZ-SW100YHA.UK PUHZ-SW100YHAR1.UK PUHZ-SW100YHAR3.UK PUHZ-SW100YHA-BS.UK PUHZ-SW100YHAR1-BS.UK PUHZ-SW100YHAR3-BS.UK PUHZ-SW120VHA.UK PUHZ-SW120VHAR3.UK PUHZ-SW120VHA-BS.UK PUHZ-SW120VHAR3-BS.UK PUHZ-SW120YHA.UK PUHZ-SW120YHAR1.UK PUHZ-SW120YHAR3.UK PUHZ-SW120YHA-BS.UK PUHZ-SW120YHAR1-BS.UK PUHZ-SW120YHAR3-BS.UK The black square ( ) indicates a switch position. Action by the switch operation Type of Switch...

  • Page 62: Special Function

    *1 Manual defrost should be done as follows. 1Change the DIP SW1-1 on the outdoor controller board from OFF to ON. 2Manual defrost will start by the above operation 1 if all these conditions written below are satisfied. • Heat mode setting •...
  • Page 63 PUHZ-SW75VHAR4.UK PUHZ-SW100VHAR4.UK PUHZ-SW100YHAR4.UK PUHZ-SW75VHAR4-BS.UK PUHZ-SW100VHAR4-BS.UK PUHZ-SW100YHAR4-BS.UK PUHZ-SW120VHAR4.UK PUHZ-SW120YHAR4.UK PUHZ-SW120VHAR4-BS.UK PUHZ-SW120YHAR4-BS.UK Action by the switch operation Type of Switch Function Effective timing Switch When compressor is working Manual defrost * Start Normal in heating operation. * Abnormal history clear Clear Normal Off or operating 1 2 3 4 5 6...
  • Page 64 Special function (a) Low-level sound priority mode (Local wiring) By performing the following modification, operation noise of the outdoor unit can be reduced by about 3-4 dB. The low noise mode will be activated when a commercially available timer or the contact input of an ON/OFF switch is added to the CNDM connector (option) on the control board of the outdoor unit.
  • Page 65 PUHZ-SW75VHA.UK PUHZ-SW75VHAR3.UK PUHZ-SW75VHAR4.UK PUHZ-SW75VHA-BS.UK PUHZ-SW75VHAR3-BS.UK PUHZ-SW75VHAR4-BS.UK PUHZ-SW100VHA.UK PUHZ-SW100VHAR3.UK PUHZ-SW100VHAR4.UK PUHZ-SW100VHA-BS.UK PUHZ-SW100VHAR3-BS.UK PUHZ-SW100VHAR4-BS.UK PUHZ-SW100YHA.UK PUHZ-SW100YHAR1.UK PUHZ-SW100YHAR3.UK PUHZ-SW100YHAR4.UK PUHZ-SW100YHA-BS.UK PUHZ-SW100YHAR1-BS.UK PUHZ-SW100YHAR3-BS.UK PUHZ-SW100YHAR4-BS.UK PUHZ-SW120VHA.UK PUHZ-SW120VHAR3.UK PUHZ-SW120VHAR4.UK PUHZ-SW120VHA-BS.UK PUHZ-SW120VHAR3-BS.UK PUHZ-SW120VHAR4-BS.UK PUHZ-SW120YHA.UK PUHZ-SW120YHAR1.UK PUHZ-SW120YHAR3.UK PUHZ-SW120YHAR4.UK PUHZ-SW120YHA-BS.UK PUHZ-SW120YHAR1-BS.UK PUHZ-SW120YHAR3-BS.UK PUHZ-SW120YHAR4-BS.UK <Display function of inspection for outdoor unit> The blinking patterns of both LED1 (green) and LED2 (red) indicate the types of abnormality when it occurs.
  • Page 66 Indication Error Outdoor controller board Check Detailed Contents Inspection method code reference LED1 (Green) LED2 (Red) page 3 blinking 1 blinking Abnormality of comp. surface P.30 1Check if stop valves are open. 2Check if connectors (TH4, TH34, LEV-A, and LEV-B) on outdoor controller thermistor(TH34) and discharging board are not disconnected.
  • Page 67 <Outdoor unit operation monitor function> [When optional part ‘A-Control Service Tool (PAC-SK52ST)’ is connected to outdoor controller board (CNM)] Digital indicator LED1 displays 2 digit number or code to inform operation condition and the meaning of check code by controlling DIP SW2 on ‘A-Control Service Tool’. Operation indicator SW2 : Indicator change of self diagnosis SW2 setting...
  • Page 68 The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature/Liquid (TH3) −40 to 90 −40 to 90 (When the coil thermistor detects 0: or below, “–” and temperature are displayed by turns.) (Example) When −10:;...
  • Page 69 The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature/Liquid (TH3) on error −40 to 90 occurring (When the coil thermistor detects 0: or below, “–” −40 to 90 and temperature are displayed by turns.) (Example) When −15:;...
  • Page 70 The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 to 3 The number of connected indoor units (The number of connected indoor units are dis- played.) Unit 2 3 4 5 6 Capacity setting display Displayed as an outdoor capacity code.
  • Page 71 The black square ( ) indicates a switch position. Display detail Unit SW2 setting Explanation for display Indoor setting temperature 17 to 30 17 to 30 2 3 4 5 6 Pressure saturation temperature (T −39 to 88 63HS −39 to 88 (When the temperature is 0: or less, “–”...
  • Page 72 The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit 180 to 370 (SW75/100/120V) DC bus voltage 300 to 750 (SW100/120Y) 180 to 370 (SW75/100/120V) (When it is 100V or more, hundreds digit, tens 300 to 750 (SW100/120Y) digit and ones digit are displayed by turns.) 2 3 4 5 6...
  • Page 73 The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 to 480 LEV-A opening pulse on error occurring (When it is 100 pulse or more, hundreds digit, tens 0 to 480 digit and ones digit are displayed by turns.) (Example) When 130 pulse;...
  • Page 74 The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 to 255 Discharge superheat on error occurring (When the temperature is 100°C or more, hundreds digit, tens digit and ones digit are displayed by 0 to 255 turns.) (Example) When 150°C;...
  • Page 75 The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Comp. surface temperature (TH34) 3 to 217 3 to 217 (When the comp.shell thermistor detects 100°C or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 105°C;...
  • Page 76 11-8. Request code list Certain indoor/outdoor combinations do not have the request code function; therefore, no request codes are displayed. Refer to indoor unit service manual for how to use the controllers and request codes for indoor unit. Description Request content Unit Remarks (Display range)
  • Page 77 Description Request content Unit Remarks (Display range) Outdoor unit-Control state – Refer to 11-8-1.Detail Contents in Request Code. Compressor-Frequency control state Refer to 11-8-1.Detail Contents in Request Code. – Outdoor unit-Fan control state – Refer to 11-8-1.Detail Contents in Request Code. Actuator output state –...
  • Page 78 Description Request content Unit Remarks (Display range) Error history 1 (latest) Displays error history. (" --" is displayed if no history is present.) Code Error history 2 (second to last) Displays error history. (" --" is displayed if no history is present.) Code Error history 3 (third to last) Displays error history.
  • Page 79 11-8-1. Detail Contents in Request Code [Operation state] (Request code :" 0") Relay output state Power currently Data display Display Compressor Four-way valve Solenoid valve supplied to compressor – – – – Relay output state Operation mode Operation mode Display Operation mode STOP •...
  • Page 80 [Actuator output state] (Request code :"54") Data display Actuator output state 1 Actuator output state 2 Actuator output state Actuator output state Compressor is Display Four-way valve Compressor Display warming up [Error content (U9)] (Request code :"55 ") Data display Error content 1 Error content 2 Error content...
  • Page 81 [Outdoor unit -– Capacity setting display] (Request code : "70") Data display Capacity [Outdoor unit – Setting information] (Request code : "71") Setting information 1 Data display Display Defrost mode Setting information 1 Standard Setting information 2 For high humidity Setting information 2 Single-/ Heat pump/...

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