Mitsubishi Electric PUHZ-SW75VHAR6 Service Manual
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Mitsubishi Electric PUHZ-SW75VHAR6 Service Manual

Split-type, air to water heat pump, outdoor unit r410a
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SPLIT-TYPE, AIR TO WATER HEAT PUMP
SERVICE MANUAL
Outdoor unit
[Model Name]
PUHZ-SW75VHA
PUHZ-SW100VHA
PUHZ-SW120VHA
PUHZ-SW100YHA
PUHZ-SW120YHA
PUHZ-SW75VHAR6
R410A
[Service ref.]
PUHZ-SW75VHAR6
PUHZ-SW100VHAR6
PUHZ-SW120VHAR6
PUHZ-SW100YHAR6
PUHZ-SW120YHAR6
Note:
• This manual describes
service data of the outdoor
units only.
CONTENTS
1. REFERENCE MANUAL ................................. 2
2. SAFETY PRECAUTION ................................. 3
3. FEATURES ..................................................... 7
4. SPECIFICATIONS .......................................... 8
5. DATA ............................................................... 9
6. OUTLINES AND DIMENSIONS ................... 11
7. WIRING DIAGRAM ...................................... 14
8. WIRING SPECIFICATIONS .......................... 17
10. TROUBLESHOOTING .................................. 21
11. DISASSEMBLY PROCEDURE ..................... 65
PARTS CATALOG (OCB755)
September 2020
No. OCH755

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Summary of Contents for Mitsubishi Electric PUHZ-SW75VHAR6

  • Page 1: Table Of Contents

    SPLIT-TYPE, AIR TO WATER HEAT PUMP September 2020 No. OCH755 SERVICE MANUAL R410A Outdoor unit [Service ref.] [Model Name] Note: PUHZ-SW75VHAR6 PUHZ-SW75VHA • This manual describes service data of the outdoor units only. PUHZ-SW100VHAR6 PUHZ-SW100VHA PUHZ-SW120VHAR6 PUHZ-SW120VHA PUHZ-SW100YHAR6 PUHZ-SW100YHA PUHZ-SW120YHAR6...

  • Page 2: Reference Manual

    REFERENCE MANUAL INDOOR UNIT SERVICE MANUAL Model name Service ref. Service manual No. EHST20C-VM6HB EHST20C-VM6B EHST20C-VM6HB.UK EHST20C-VM6B.UK EHST20C-YM9HB EHST20C-YM9B EHST20C-YM9HB.UK EHST20C-YM9B.UK EHST20C-TM9HB EHST20C-VM6EB EHST20C-TM9HB.UK EHST20C-VM6EB.UK OCH531/OCB531 EHST20C-VM2B EHST20C-YM9EB EHST20C-VM2B.UK EHST20C-YM9EB.UK EHST20C-VM6SB EHST20C-VM6SB.UK EHSC-VM2B EHSC-VM6EB EHSC-VM2B.UK EHSC-VM6EB.UK EHSC-VM6B EHSC-YM9EB EHSC-VM6B.UK EHSC-YM9EB.UK OCH532/OCB532 EHSC-YM9B ERSC-VM2B...

  • Page 3: Safety Precaution

    SAFETY PRECAUTION 2-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. Preparation before the repair service. Precautions during the repair service. • Do not perform the work involving the electric parts with wet hands. •...
  • Page 4 [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) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them. [2] Additional refrigerant charge When charging directly from cylinder (1) Check that cylinder for R410A on the market is a syphon type.
  • Page 5 2-3. 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 technical data materials to confirm if the pipes can be used. Measure the existing pipe thickness and check for damage.
  • Page 6 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 7: Features

    FEATURES PUHZ-SW100VHA PUHZ-SW75VHA PUHZ-SW100YHA PUHZ-SW120VHA PUHZ-SW120YHA 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. The additional refrigerant charging work during installation often causes problems.

  • Page 8: Specifications

    SPECIFICATIONS <Reference data> Plate heat exchanger (ACH70-40 plates) PUHZ-SW75VHAR6 PUHZ-SW120VHAR6 PUHZ-SW120YHAR6 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...

  • Page 9: Data

    Initial Service Ref. charge 10 m 20 m 30 m 40 m 50 m 60 m 75 m PUHZ-SW75VHAR6 3.35 — — — PUHZ-SW100V/YHAR6 PUHZ-SW120V/YHAR6 Additional charge is required for pipes longer than 10 m. 5-2. COMPRESSOR TECHNICAL DATA (Winding temperature at 20°C) Service Ref.
  • Page 10 5-3. NOISE CRITERION CURVES PUHZ-SW75VHAR6 SPL(dB) MODE LINE COOLING HEATING MICROPHONE UNIT NC-70 1.5m 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-SW100VHAR6 PUHZ-SW120VHAR6 SPL(dB) MODE LINE...

  • Page 11: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PUHZ-SW75VHAR6 Unit : mm OCH755...
  • Page 12 PUHZ-SW100VHAR6 PUHZ-SW120VHAR6 Unit : mm OCH755...
  • Page 13 PUHZ-SW100YHAR6 PUHZ-SW120YHAR6 Unit : mm OCH755...

  • Page 14: Wiring Diagram

    WIRING DIAGRAM PUHZ-SW75VHAR6 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>...
  • Page 15 PUHZ-SW100VHAR6 PUHZ-SW120VHAR6 SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block <Power Thermistor <Ambient> Switch <Function Switch, Model Select > Thermistor internal <Heat Sink> Supply, Indoor/Outdoor> Switch <Model Select > Motor for Compressor TH34 Thermistor <Comp. Surface> Switch <Function Switch > *1 MODEL SELECT The black square ( ) indicates a switch position.
  • Page 16 PUHZ-SW100YHAR6 PUHZ-SW120YHAR6 SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block <Power Supply> TH34 Thermistor <Comp. Surface> Switch <Function Switch > Terminal Block <Indoor/Outdoor> Linear Expansion Valve LEV-A, LEV-B Switch <Function Switch, Model Select > Motor for Compressor ACL1, ACL2, Switch <Model Select > *1 MODEL SELECT Reactor MF1, MF2...

  • Page 17: Wiring Specifications

    WIRING SPECIFICATIONS FIELD ELECTRICAL WIRING (power wiring specifications) SW75V SW100V SW120V SW100, 120Y Outdoor model name ~/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 18: Refrigerant System Diagram

    Strainer Refrigerant flow in heating #100 #100 Symbol Part name Detail COMP Compressor DC inverter twin rotary compressor (Mitsubishi Electric Corporation) Muffler Muffler Discharge muffler H/P SW High pressure switch (63H) For protection (OFF: 4.15MPa) REV/V Reversing (4-way) valve (21S4)
  • Page 19 Refrigerant flow in heating Strainer #100 #100 Detail Symbol Part name COMP Compressor DC inverter scroll compressor (Mitsubishi Electric Corporation) Muffler Muffler Discharge muffler H/P SW High pressure switch (63H) For protection (OFF: 4.15MPa) L/P SW Low pressure switch (63L) For protection (OFF: -0.03MPa)
  • Page 20 9-1. 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 (low pressure side) on the outdoor unit. 3 Close the liquid stop valve completely.

  • Page 21: Troubleshooting

    TROUBLESHOOTING 10-1. 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 22 10-2. 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 Cause Judgment and action 1 Check following items. 1 No voltage is supplied to terminal block (TB1) of outdoor unit.
  • Page 23 Check code Abnormal point and detection method Cause Judgment and action 2 connector open (SW100/120 only) 1 Disconnection or contact failure 1 Check connection of connector (63H,63L) on 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 "10-6.
  • Page 24 <Abnormalities detected while unit is operating> Check code Abnormal point and detection method Cause Judgment and action 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 25 Check code Abnormal point and detection method Cause Judgment and action 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 26 Check code Abnormal point and detection method Cause Judgment and action Detailed 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. codes To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2 and 2-6. Refer to "10-7.
  • Page 27 From the previous page. Check code Abnormal point and detection method Cause Judgment and action Detailed PFC error (Overvoltage/ 1 Abnormal increase in power source 12 Check the field facility for the power codes Undervoltage/Overcurrent) voltage supply. 3 Correct the wiring (U . V . W phase) to •...
  • Page 28 Check code Abnormal point and detection method Cause Judgment and action Compressor overcurrent interruption 1 Stop valve of outdoor unit is 1 Open stop valve. Abnormal if overcurrent DC bus or closed. 2 Check facility of power supply. compressor is detected after compressor 2 Decrease of power supply 3 Correct the wiring (U W phase) to...
  • Page 29 Check code Abnormal point and detection method Cause Judgment and action Interface unit/Flow temp. controller 1 Contact failure, short circuit Note: Check LED display on the outdoor or outdoor unit communication error or, miswiring (converse wiring) controller circuit board. (Connect A-control (Signal receiving error) of Interface unit/Flow temp.
  • Page 30 Check code Abnormal point and detection method Cause Judgment and action Actual tank temperature thermistor (TH5) 1 Defective thermistor character- 1–3 Check resistance value of thermistor. 0: ... 15.0 k" 1 The unit is 3-minute resume preven- istics 30: 4.3 k" 10: ..
  • Page 31 Phenomena Factor Countermeasure 3. When pressing the remote controller 1 After cancelling to select function from the 1 Normal operation operation switch, the OPERATION remote controller, the remote controller opera- display is appeared but it will be tion switch will not be accepted for approx. 30 turned off soon.
  • Page 32 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 33 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 34 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 35 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 36 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 VDC? •...
  • Page 37 10-4. HOW TO CHECK THE PARTS Checkpoints Parts name Thermistor (TH3) Disconnect the connector then measure the resistance with a multimeter. <Liquid> (At the ambient temperature 10 to 30:) Thermistor (TH4) Normal Abnormal <Discharge> Thermistor (TH6) 160 to 410 k" TH34 <2-phase pipe>...
  • Page 38 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. 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 39 <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 ± 1% =15exp{3480( – 273+t 15 k" 4.3 k" 9.6 k" 3.0 k"...
  • Page 40 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 41 (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 42 10-6. TEST POINT DIAGRAM Outdoor controller circuit board CNDC 280–380 VDC 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 VDC –...
  • Page 43 Outdoor noise filter circuit board PUHZ-SW100YHAR6 PUHZ-SW120YHAR6 LI1, LI2, LI3, NI POWER SUPPLY LI1-LI2/LI-LI3/LI3-LI1 : 400 VAC input LI1-NI/LI2-NI/LI3-NI : 230 VAC input (Connect to the terminal block (TB1)) Connect to the earth CNAC1, CNAC2 230 VAC (Connect to the Connect to the earth outdoor controller circuit board...
  • Page 44 Outdoor power circuit board Brief Check of DIP-IPM and D.B. PUHZ-SW75VHAR6 If they are short-circuited, it means that they are broken. Measure the resistance in the following points (connectors, etc.). 1. Check of DIP-IPM P2 - U , P2 - V , P2 - W , N2 - U , N2 - V , N2 - W 2.
  • Page 45 Outdoor power circuit board Brief Check of POWER MODULE If they are short-circuited, it means that they are broken. PUHZ-SW100VHAR6 Measure the resistance in the following points (connectors, etc.). PUHZ-SW120VHAR6 1. Check of POWER MODULE 1 Check of DIODE circuit R - L1 , S - L1 , R - N1 , S - N1 2 Check of IGBT circuit L2 - N1...
  • Page 46 Outdoor power circuit board Brief Check of POWER MODULE If they are short-circuited, it means that they are broken. PUHZ-SW100YHAR6 Measure the resistance in the following points (connectors, etc.). PUHZ-SW120YHAR6 1. Check of DIODE MODULE L1 - P1 , L2 - P1 , L3 - P1 , L1 - N1 , L2 - N1 , L3 - N1 2.
  • Page 47 Outdoor converter circuit board PUHZ-SW100YHAR6 PUHZ-SW120YHAR6 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 (TB-L1, L2, L3)
  • Page 48 10-7. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS (1) Function of switches 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...
  • Page 49 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 50 <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. Types of abnor- mality can be indicated in details by connecting an optional part “A-Control Service Tool (PAC-SK52ST)” to connector CNM on outdoor controller board.
  • Page 51 Indication Error Outdoor controller board Detailed Check Contents Inspection method reference code* LED1 (Green) LED2 (Red) page 3 blinking 1 blinking Abnormality of comp. surface 1 Check if stop valves are open. thermistor (TH34) and discharge 2 Check if connectors (TH4, TH34, LEV-A, and LEV-B) P.24 temperature (TH4) on outdoor controller board are not disconnected.
  • Page 52 <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 53 The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit The pipe temperature/Liquid (TH3) −40 to 90 −40 to 90 (When the coil thermistor detects 0°C or below, “–” and temperature are displayed by turns.) °C Example: When −10°C 0.5 s...
  • Page 54 SW2 setting Display detail Explanation for display Unit The pipe temperature/Liquid (TH3) when −40 to 90 the last error occurred (When the coil thermistor detects 0: or below, “–” −40 to 90 and temperature are displayed by turns.) °C Example: When −15°C 0.5 s 0.5 s 2 3 4 5 6...
  • Page 55 The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit The 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 56 The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Number of defrost cycles 0 to FFFE (in hexadecimal notation) 0 to FFFE (When more than FF in hex (255 in decimal), the number is displayed in order of 16 's and 16 's, and...
  • Page 57 The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit The fan step when the last error 0 to 10 occurred Step 0 to 10 2 3 4 5 6 The LEV-A opening pulse when the last 0 to 480 error occurred (When it is 100 pulse or more, hundreds digit, tens...
  • Page 58 The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit The thermo-on time until error stops 0 to 999 0 to 999 (When it is 100 minutes or more, hundreds digit, tens digit and ones digit are displayed by turns.) Minute Example: When 415 minutes 2 3 4 5 6...
  • Page 59 10-8. 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 60 Description Request content Unit Remarks (Display range) Outdoor unit-Control state – Refer to 10-8-1.Detail Contents in Request Code. Compressor-Frequency control state Refer to 10-8-1.Detail Contents in Request Code. – Outdoor unit-Fan control state Refer to 10-8-1.Detail Contents in Request Code. –...
  • Page 61 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 62 10-8-1. 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 63 [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...
  • Page 64 [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/ Display...

  • Page 65: Disassembly Procedure

    DISASSEMBLY PROCEDURE : Indicates the visible parts in the photos/figures. PUHZ-SW75VHAR6 : Indicates the invisible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the service panel and top panel Photo 1 Top panel fixing screws Top panel (1) Remove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service panel.
  • Page 66 OPERATING PROCEDURE PHOTOS/FIGURES Photo 4 4. Removing the thermistor <2-phase pipe> (TH6) (1) Remove the service panel. (See Photo 1) Thermistor <2-phase pipe> (TH6) (2) Remove the top panel. (See Photo 1) Electrical parts box Clamps (3) Disconnect the connector TH7/6 on the controller circuit board.
  • Page 67 OPERATING PROCEDURE PHOTOS/FIGURES Photo 7 7. Removing the 4-way valve coil (21S4), LEV coil (LEV-A, LEV-B) (1) Remove the service panel. (See Photo 1) 4-way valve coil (2) Remove the top panel. (See Photo 1) 4-way valve fixing screw [Removing the 4-way valve coil] (3) Remove 4-way valve coil fixing screw (M5 ×...
  • Page 68 OPERATING PROCEDURE PHOTOS/FIGURES Photo 9 11. Removing the reactor (ACL) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) Reactor fixing screws (3) Remove the electrical parts box. (See Photo 3) (4) Pull out the lead wire of reactor (ACL). (5) Remove 4 reactor fixing screws (4 ×...
  • Page 69 OPERATING PROCEDURE PHOTOS/FIGURES Photo 12 14. Removing the muffler (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 3) (4) Remove the valve bed. (Refer to procedure 8) (5) Remove the cover panel (front).
  • Page 70 PUHZ-SW100VHAR6 PUHZ-SW120VHAR6 OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the service panel and top panel Photo 1 Top panel fixing screws Top panel (1) Remove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service panel.
  • Page 71 OPERATING PROCEDURE PHOTOS/FIGURES Photo 4 4. Removing the thermistor <2-phase pipe> (TH6) Thermistor (1) Remove the service panel. (See Photo 1) <2-phase pipe> (TH6) Cable strap Electrical parts box (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 72 OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the 4-way valve coil (21S4), and LEV coil Photo 7 (LEV(A), LEV(B)) 4-way valve coil (21S4) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) [Removing the 4-way valve coil] LEV coil (3) Remove 4-way valve coil fixing screw (M5 ×...
  • Page 73 OPERATING PROCEDURE PHOTOS/FIGURES 11. Removing the reactor (DCL) Photo 9 (1) Remove the service panel. (See Photo 1) Reactor Electrical parts box (DCL) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 3) <Removing the reactor>...
  • Page 74 PUHZ-SW100YHAR6 PUHZ-SW120YHAR6 OPERATING PROCEDURE PHOTOS/FIGURES Top panel 1. Removing the service panel and top panel Photo 1 Top panel fixing screws (1) Remove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service panel.
  • Page 75 From the previous page OPERATING PROCEDURE PHOTOS/FIGURES (9) Remove the terminal cover and disconnect the compressor Photo 3-2 lead wire. (10) Remove 3 electrical parts box fixing screws (4 × 10) and Electrical detach the electrical parts box by pulling it upward. parts box The electrical parts box is fixed with 2 hooks on the left and 1 hook on the right.
  • Page 76 OPERATING PROCEDURE PHOTOS/FIGURES Photo 5 5. Removing the thermistor <2-phase pipe> (TH6) Thermistor (1) Remove the service panel. (See Photo 1) Electrical parts box <2-phase pipe> (TH6) (2) Remove the top panel. (See Photo 1) (3) Disconnect the connector TH7/6 (red), on the outdoor controller circuit board in the electrical parts box.
  • Page 77 OPERATING PROCEDURE PHOTOS/FIGURES Photo 8 8. Removing the 4-way valve coil (21S4), and LEV coil (LEV(A), LEV(B)) 4-way valve coil (21S4) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) [Removing the 4-way valve coil] LEV coil (3) Remove 4-way valve coil fixing screw (M5 ×...
  • Page 78 OPERATING PROCEDURE PHOTOS/FIGURES Photo 10-1 12. Removing the reactors (ACL1, ACL2, ACL3) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) Controller circuit board (3) Remove the 6 screws, screw 8 and 9 (5 × 12), that fix Screw Front panel (C.B.)
  • Page 79 OPERATING PROCEDURE PHOTOS/FIGURES 13. Removing the compressor (MC) Photo 11 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove 2 cover panel (front) fixing screws (5 × 12) and remove the cover panel (front). (See Photo 3-1) (4) Remove 2 cover panel (rear) fixing screws (5 ×...
  • Page 80 HEAD OFFICE : TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2020 MITSUBISHI ELECTRIC CORPORATION Published: Sep. 2020 No.OCH755 Specifications are subject to change without notice. Made in Japan...

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