Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS December 2012 No.OCH415 REVISED EDITION-F SERVICE MANUAL R410A Outdoor unit [Model names] Revision: PUHZ-P100VHA2 • PUHZ-P100VHA4.UK, PUHZ-P100YHA2.UK, PUHZ-P125VHA2 PUHZ-P125/140VHA3R3.UK and PUHZ-P125/140YHAR2.UK PUHZ-P140VHA2 have been added in REVISED EDITION-F. PUHZ-P100VHA3 • Some descriptions have been modified.
Page 2: Puhz-P125Vha2
[Service Ref.] PUHZ-P100VHA2.UK PUHZ-P140VHA3R1.UK PUHZ-P125VHA2.UK PUHZ-P140VHA3R2.UK PUHZ-P125VHA2 PUHZ-P140VHA3R3.UK PUHZ-P140VHA2.UK PUHZ-P100YHA.UK PUHZ-P140VHA2 PUHZ-P100YHAR1.UK PUHZ-P100VHA3.UK PUHZ-P100YHA2.UK PUHZ-P100VHA3R1.UK PUHZ-P125YHA.UK PUHZ-P100VHA3R2.UK PUHZ-P125YHAR1.UK PUHZ-P100VHA4.UK PUHZ-P125YHAR2.UK PUHZ-P125VHA3.UK PUHZ-P140YHA.UK PUHZ-P125VHA3R1.UK PUHZ-P140YHAR1.UK PUHZ-P125VHA3R2.UK PUHZ-P140YHAR2.UK PUHZ-P125VHA3R3.UK PUHZ-P140VHA3.UK TECHNICAL CHANGES PUHZ-P100VHA3R2.UK PUHZ-P100VHA4.UK PUHZ-P100YHAR1.UK PUHZ-P100YHA2.UK • Electrical parts, Controller circuit board (C.B.), Power circuit board (P.B.) and Noise filter circuit board (N.F.) have been changed.
Page 3: Reference Manual
REFERENCE MANUAL INDOOR UNIT’S SERVICE MANUAL Service Model name Service Ref. Manual No. PLA-RP50/60/71/100/125/140BA.UK PLA-RP50/60/71/100/125/140BA#2.UK PLA-RP50/60/71/100/125/140BA OCH412 PLA-RP50/60/71BA PLA-RP140BA2 OCB412 PLA-RP50/60/71BAR3.UK PLA-RP140BA2R1.UK PCA-RP50/60/71/100/125/140GA PCA-RP50/60/71/100/125/140GA(#1) OC328 PCA-RP50GA2 PCA-RP50GA2(#1) PCA-RP71/125HA PCA-RP71/125HA(#1) OC329 PKA-RP50GAL PKA-RP50GAL(#1) OC330 PKA-RP60/71/100FAL PKA-RP60/71/100FAL(#1) OC331 PKA-RP50FAL2 PKA-RP50FAL2(#1) PEAD-RP50/60/71/125/140EA PEAD-RP50/60/71/125/140EA(#1).UK HWE0521 PEAD-RP100EA2 PEAD-RP100EA2(#1).UK...
Page 4 3-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Use a vacuum pump with a reverse flow check Use new refrigerant pipes. valve. In case of using the existing pipes for R22, be careful with Vacuum pump oil may flow back into refrigerant cycle and the followings.
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 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-P125VHA2.UK PUHZ-P140VHA2.UK PUHZ-P100VHA2.UK PUHZ-P125VHA2 PUHZ-P100VHA3.UK PUHZ-P140VHA2 PUHZ-P125VHA3R1.UK PUHZ-P125YHA.UK PUHZ-P100VHA3R1.UK PUHZ-P140VHA3R1.UK PUHZ-P140YHA.UK PUHZ-P100VHA3R2.UK PUHZ-P125VHA3R2.UK PUHZ-P125YHAR1.UK PUHZ-P100VHA4.UK PUHZ-P140VHA3R2.UK PUHZ-P140YHAR1.UK PUHZ-P100YHA.UK PUHZ-P125VHA3R3.UK PUHZ-P125YHAR2.UK PUHZ-P100YHAR1.UK PUHZ-P140VHA3R3.UK PUHZ-P140YHAR2.UK PUHZ-P100YHA2.UK CHARGELESS SYSTEM PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT. (Max. 30m (PUHZ-P125/P140)) The refrigerant circuit with LEV (Linear Expansion Valve) and Accumulator always control the optimal refrigerant level regardless of the length (30m max.
Page 8: Specifications
SPECIFICATIONS PUHZ-P100VHA2.UK PUHZ-P100VHA3.UK Service Ref. PUHZ-P100VHA3R1.UK PUHZ-P100VHA3R2.UK Mode Cooling Heating Power supply (phase, cycle, voltage) Single, 50Hz, 230V Running current 12.26 12.62 Max. current External finish Munsell 5Y 7/1 / Munsell 3Y 7.8/1.1 (VHA3R1 / R2) Refrigerant control Linear Expansion Valve...
Page 9 PUHZ-P125VHA2.UK PUHZ-P140VHA2.UK PUHZ-P125VHA2 PUHZ-P140VHA2 PUHZ-P125VHA3.UK PUHZ-P140VHA3.UK Service Ref. PUHZ-P125VHA3R1.UK PUHZ-P140VHA3R1.UK PUHZ-P125VHA3R2.UK PUHZ-P140VHA3R2.UK PUHZ-P125VHA3R3.UK PUHZ-P140VHA3R3.UK Mode Cooling Heating Cooling Heating Power supply (phase, cycle, voltage) Single 50Hz, 230V 16.74 22.48 21.31 Running current 17.37 29.5 Max. current External finish Munsell 5Y 7/1 / Munsell 3Y 7.8/1.1 (VHA3R1/R2/R3) Refrigerant control Linear Expansion Valve Compressor...
Page 10 PUHZ-P100YHA.UK Service Ref. PUHZ-P100YHAR1.UK Cooling Heating Mode Power supply (phase, cycle, voltage) 3phase, 50Hz, 400V Running current 4.78 5.05 Max. current External finish Munsell 3Y 7.8/1.1 Refrigerant control Linear Expansion Valve Hermetic Compressor Model TNB220FLCMT Motor output Inverter Starter type Protection devices HP switch Discharge thermo/Comp.
Page 11 PUHZ-P125YHA.UK PUHZ-P140YHA.UK Service Ref. PUHZ-P125YHAR1.UK PUHZ-P140YHAR1.UK PUHZ-P125YHAR2.UK PUHZ-P140YHAR2.UK Cooling Heating Cooling Heating Mode Power supply (phase, cycle, voltage) 3phase, 50Hz, 400V 6.18 6.09 7.92 7.58 Running current Max. current External finish Munsell 3Y 7.8/1.1 Refrigerant control Linear Expansion Valve Hermetic Compressor Model TNB306FPNM/TNB306FPNMT (YHAR2)
Page 12: Data
DATA 6-1. REFILLING REFRIGERANT CHARGE (R410A : kg) Piping length (one way) Initial Service Ref. charged PUHZ-P100VHA2.UK PUHZ-P100VHA3.UK PUHZ-P100VHA3R1.UK PUHZ-P100VHA3R2.UK PUHZ-P100VHA4.UK PUHZ-P100YHA.UK PUHZ-P100YHAR1.UK PUHZ-P100YHA2.UK PUHZ-P125VHA2.UK PUHZ-P125VHA2 PUHZ-P125VHA3.UK PUHZ-P125VHA3R1.UK PUHZ-P125VHA3R2.UK PUHZ-P125VHA3R3.UK PUHZ-P125YHA.UK PUHZ-P125YHAR1.UK PUHZ-P125YHAR2.UK PUHZ-P140VHA2.UK PUHZ-P140VHA2 PUHZ-P140VHA3.UK PUHZ-P140VHA3R1.UK PUHZ-P140VHA3R2.UK PUHZ-P140VHA3R3.UK PUHZ-P140YHA.UK PUHZ-P140YHAR1.UK...
Page 13: Noise Criterion Curves
6-3. NOISE CRITERION CURVES PUHZ-P100VHA2.UK MICROPHONE PUHZ-P100VHA3.UK PUHZ-P100VHA3R1.UK PUHZ-P100VHA3R2.UK UNIT PUHZ-P100VHA4.UK PUHZ-P100YHA.UK SPL(dB) MODE LINE PUHZ-P100YHAR1.UK COOLING HEATING 1.5m PUHZ-P100YHA2.UK GROUND NC-70 NC-60 NC-50 NC-40 NC-30 APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 1000 2000 4000 8000 PUHZ-P125VHA2.UK PUHZ-P140VHA2.UK...
Page 14: Standard Operation Data
0.13 0.15 0.14 0.16 0.15 Input 0.94 0.87 0.94 0.87 1.00 0.94 1.07 1.00 Amperes PUHZ-P100VHA2 PUHZ-P100VHA4 PUHZ-P125VHA2 PUHZ-P140VHA2 Outdoor unit PUHZ-P100VHA3 PUHZ-P100YHA2 PUHZ-P125VHA3 PUHZ-P140VHA3 PUHZ-P100YHA PUHZ-P125YHA PUHZ-P140YHA 1/3 , 50 1/3 , 50 Phase , Hz 1 /3, 50...
Page 15: Outlines And Dimensions
OUTLINES AND DIMENSIONS OUTDOOR UNIT Unit : mm PUHZ-P100VHA2.UK PUHZ-P100VHA3.UK OCH415F...
Page 16 PUHZ-P125VHA2.UK Unit : mm PUHZ-P140VHA2.UK PUHZ-P125VHA2 PUHZ-P140VHA2 PUHZ-P125VHA3.UK PUHZ-P140VHA3.UK OCH415F...
Page 17 PUHZ-P100VHA3R1.UK Unit : mm OCH415F...
Page 18 PUHZ-P125VHA3R1.UK Unit : mm PUHZ-P140VHA3R1.UK OCH415F...
Page 19 PUHZ-P100VHA3R2.UK Unit : mm PUHZ-P100VHA4.UK OCH415F...
Page 20 PUHZ-P125VHA3R2.UK Unit : mm PUHZ-P140VHA3R2.UK PUHZ-P125VHA3R3.UK PUHZ-P140VHA3R3.UK OCH415F...
Page 21 PUHZ-P100YHA.UK Unit : mm PUHZ-P100YHAR1.UK PUHZ-P100YHA2.UK OCH415F...
Page 22 PUHZ-P125YHA.UK Unit : mm PUHZ-P140YHA.UK PUHZ-P125YHAR1.UK PUHZ-P140YHAR1.UK PUHZ-P125YHAR2.UK PUHZ-P140YHAR2.UK OCH415F...
Page 23: Wiring Diagram
WIRING DIAGRAM PUHZ-P100VHA2.UK PUHZ-P125VHA2.UK PUHZ-P140VHA2.UK PUHZ-P125VHA2 PUHZ-P140VHA2 PUHZ-P100VHA3.UK PUHZ-P125VHA3.UK PUHZ-P140VHA3.UK PUHZ-P100VHA3R1.UK PUHZ-P125VHA3R1.UK PUHZ-P140VHA3R1.UK SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block<Power Supply, Indoor/Outdoor > P.B. Power Circuit Board Switch Motor Compressor TABU/V/W Connection Terminal<U/V/W-Phase> Switch MF1,MF2 Fan Motors TABS/T Connection Terminal<L/N- Phase>...
Page 24 PUHZ-P100VHA3R2.UK PUHZ-P125VHA3R2.UK PUHZ-P140VHA3R2.UK PUHZ-P125VHA3R3.UK PUHZ-P140VHA3R3.UK The black square ( ) indicates a switch position. OCH415F...
Page 25 PUHZ-P100VHA4.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 <Pump Down> Fan Motor Connection Terminal <L-Phase> Connector <Emergency Operation> CN31 21S4 Solenoid Valve (Four-Way Valve) Connection Terminal <N-Phase>...
Page 26 PUHZ-P100YHA.UK PUHZ-P125YHA.UK PUHZ-P140YHA.UK The black square ( ) indicates a switch position. OCH415F...
Page 27 PUHZ-P100YHAR1.UK PUHZ-P125YHAR1.UK PUHZ-P140YHAR1.UK PUHZ-P125YHAR2.UK PUHZ-P140YHAR2.UK The black square (■) indicates a switch position. OCH415F...
Page 28 PUHZ-P100YHA2.UK SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block <Power Supply> Rush Current Protect Resistor Switch <Test Operation> Terminal Block <Indoor/Outdoor> CY1, CY2 Capacitor Switch <Function Switch, Model Select> Motor for Compressor P.B. Power Circuit Board Switch <Model Select> Fan Motor TB-U/V/W Connection Terminal <U/V/W-Phase>...
Page 29: Wiring Specifications
WIRING SPECIFICATIONS 9-1. FIELD ELECTRICAL WIRING (power wiring specifications) Outdoor unit model P100, 125V P140V P100,125,140Y Outdoor unit power supply ~/N (single), 50 Hz, ~/N (single), 50 Hz, 3N~ (3ph,4-wires), 230 V 230 V 50Hz, 400 V Outdoor unit input capacity 32 A 40 A 16 A...
Page 30: Separate Indoor Unit/Outdoor Unit Power Supplies
9-2. SEPARATE INDOOR UNIT/OUTDOOR UNIT POWER SUPPLIES The following connection patterns are available. The outdoor unit power supply patterns vary on models. 1:1 System <For models without heater> * The optional indoor power supply terminal kit is required. Outdoor unit power supply Earth leakage breaker Wiring circuit breaker or isolating switch Outdoor unit...
Page 31 9-3. INDOOR – OUTDOOR CONNECTING CABLE The cable shall not be lighter than design 60245 IEC or 60227 IEC. The cable length may vary depending on the condition of installation, humidity or materials, etc. Wire size Cross section Number Polarity L(m) *5 of cable of wires...
Page 32 9-4. M-NET WIRING METHOD (Points to note) (1) Outside the unit, transmission wires should stay away from electric wires in order to prevent electromagnetic noise from making an influence on the signal communication. Place them at intervals of more than 5 cm. Do not put them in the same conduit tube.
Page 33 M-NET wiring M-NET (1) Use 2-core × 1.25 mm² shield wire for electric wires. terminal Earth (Excluding the case connecting to system controller.) block wire (2) Connect the wire to the M-NET terminal block. Connect one core of the trans- mission wire (no-polarity) to A terminal and the other to B.
Page 34: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit : mm (inch) PUHZ-P100VHA2.UK Refrigerant flow in cooling PUHZ-P100VHA3.UK Refrigerant flow in heating PUHZ-P100VHA3R1.UK Service High pressure port protect switch (check) Stop valve Outdoor heat exchanger 4-way valve (#50) Thermistor Refrigerant GAS pipe Strainer (TH6) 15.88mm( 5/8)
Page 35 Unit : mm (inch) PUHZ-P100VHA3R2.UK Refrigerant flow in cooling PUHZ-P100VHA4.UK Refrigerant flow in heating PUHZ-P100YHA.UK PUHZ-P100YHAR1.UK Service High pressure PUHZ-P100YHA2.UK port protect switch (check) Stop valve Outdoor heat exchanger 4-way valve (#50) Thermistor Refrigerant GAS pipe Strainer (TH6) 15.88mm( 5/8) Thermistor Service (TH3)
Page 36 1. Refrigerant collecting (pump down) Perform the following procedures to collect the refrigerant when moving the indoor unit or the outdoor unit. 1 Supply power (circuit breaker). * When power is supplied, make sure that “CENTRALLY CONTROLLED” is not displayed on the remote controller. If “CEN- TRALLY CONTROLLED”...
Page 37: Troubleshooting
TROUBLESHOOTING 11-1. TROUBLESHOOTING <Error code display by self-diagnosis and actions to be taken for service (summary)> Present and past error codes are logged and displayed on the wired remote controller and 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.
Page 38 11-2-2. Test run for wired remote controller <PAR-31MAA> MENU RETURN SELECT ON/OFF Function buttons Select "Service" from the Main menu, and press the button. Test run Input maintenance info. Function setting Check Self check Select "Test run" with the F1 or F2 button, and press the button.
Page 39: Error Information
<Error information> When an error occurs, the following screen will appear. Check the error status, stop the operation, and consult your dealer. Error code, error unit, refrigerant address, unit model name, and serial Error information number will appear. Error code Error unit The model name and serial number will appear only if the information have Ref.
Page 40 <Checking the error information> While no errors are occurring, page 2/2 of the error information can be viewed by Main Main menu selecting "Error information" from the Main menu. Restriction Energy saving Errors cannot be reset from this screen. Night setback Filter information Error information Main display:...
Page 41: Operating Procedures
11-2-3. Test run for wired remote controller <PAR-21MAA> Operating procedures While the room temperature display on the remote "TEST RUN" and the currently selected controller is “PLEASE WAIT”, the remote controller is disabled. operation mode are displayed alternately. Wait until “PLEASE WAIT” disappears before using remote controller. 1.
Page 42 11-2-3. Test run for wireless remote controller Measure an impedance between the power supply terminal block on the outdoor unit and ground with a 500V Megger and check that it is equal to or greater than 1.0 M". TEST RUN 1 Turn on the main power to the unit.
Page 43: How To Proceed "Self-Diagnosis
11-3. HOW TO PROCEED "SELF-DIAGNOSIS" 11-3-1. Self-diagnosis <PAR-31MAA> Select "Service" from the Main menu, and press the button. Test run Input maintenance info. Function setting Check Self check Select "Self check" with the F1 or F2 button, and press the button.
Page 44 11-3-2. Remote controller check <PAR-31MAA> * If operations cannot be completed with the remote controller, diagnose the remote controller with this function. Select "Service" from the Main menu, and press the button. Maintenance password Remote controller check Select "Remote controller check" with the F1 or F2 button, and press the button.
Page 45 11-3-3. Self-diagnosis <PAR-21MAA> If a problem occurs in the air conditioner, the indoor and outdoor units will stop, and the problem is shown in the remote controller display. [CHECK] and the refrigerant address are displayed on the temperature display, and the error code and unit number are displayed alternately as shown below.
Page 46 When the error history is reset, the display will look like the one shown below. Press the button twice within 3 seconds. ON/OFF However, if you fail to reset the error history, the error content will be displayed again. The self-diagnosis address or refrigerant address will flash. Cancel self-diagnosis.
Page 47 11-3-6. Self-diagnosis <Wireless remote controller> <In case of trouble during operation> When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop. < Malfunction-diagnosis method at maintenance service> [Procedure] 1.
Page 48 • Refer to the following tables for details on the check codes. [Output pattern A] Beeper sounds Beep Beep Beep Beep Beep Beep Beep OPERATION · · · Repeated INDICATOR lamp blink pattern Approx. 2.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.
Page 49: Self-Diagnosis Action Table
11-4. SELF-DIAGNOSIS ACTION TABLE <Abnormalities detected when the power is turned on> (Note 1) Refer to indoor unit section for code P and code E. Error Code Abnormal points and detection method Judgment and action Case 1 No voltage is supplied to terminal 1 Check following items.
Page 50 Abnormal points and detection method Case Judgment and action Error Code 1 Contact failure or miswiring of 1 Check disconnection or looseness or polarity Indoor/outdoor unit connector of indoor/outdoor unit connecting wire of indoor/outdoor unit connecting miswiring, excessive number of units (4 wire indoor and outdoor units.
Page 51 <Abnormalities detected while unit is operating> Error Code Abnormal points and detection method Judgment and action Case 1 Short cycle of indoor unit 1~6 Check indoor unit and repair defect. High pressure (High-pressure switch 2 Clogged filter of indoor unit 63H operated) 3 Decreased airflow caused by Abnormal if high-pressure switch 63H...
Page 52 Abnormal points and detection method Case Judgment and action Error Code Open/short circuit of discharge 1 Disconnection or contact failure 1 Check connection of connector (TH4) on the temperature thermistor (TH4 or TH32) outdoor controller circuit board. of connector (TH4 or TH32) on Check breaking of the lead wire for Abnormal if open (3: or less) or short the outdoor controller circuit...
Page 53 Error Code Abnormal point and detection method Case Judgment and action To find out the details about U9 error, turn ON SW2-1, 2-2, 2-3, 2-4, 2-5, 2-6 when U9 error occurs. Detailed To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2, 2-6. codes Refer to 11-10.
Page 54 From the previous page. Abnormal points and detection method Case Judgment and action Error Code PFC error (Overvoltage/ Not applicable for P100, 125, Check for the switch settings for Model Select Detailed codes Undervoltage/Overcurrent) 140VHA and P100, 125, 140YHA on the outdoor controller circuit board. •...
Page 55 Abnormal points and detection method Judgment and action Error Code Case 1 Stop valve of outdoor unit is 1 Open stop valve. Compressor overcurrent interruption Abnormal if overcurrent DC bus or closed. 2 Decrease of power supply voltage 2 Check facility of power supply. compressor is detected after compressor 3 Looseness, disconnection or 3 Correct the wiring (U·V·W phase) to...
Page 56 Abnormal points and detection method Judgment and action Error Code Case 1 Contact failure of indoor/ 1 Check disconnection or looseness of indoor/ Indoor/outdoor unit communication error (Signal receiving error) outdoor unit connecting wire outdoor unit connecting wire of indoor or (Outdoor unit) 2 Defective communication circuit outdoor units.
Page 57 Error Code Abnormal points and detection method Judgment and action Case Abnormal refrigerant circuit 1 When this error occurs, be sure to 1 Abnormal operation of 4-way During Cooling, Dry, or Auto Cooling valve replace the 4-way valve. operation, when the following are 2 Disconnection of or leakage in 2 Check refrigerant pipes for disconnection or regarded as failures when detected for...
Page 58 Error Code Abnormal points and detection method Case Judgment and action 1 Data of transmission processor Communication error with Turn off the power supply of outdoor unit, communication processor or unit processor is not indoor unit and FRESH MASTER or LOSSNAY Defective communication between unit at the same time for 2 minutes or more, and transmitted normally because...
Page 59 From the previous page. Error Code Abnormal points and detection method Case Judgment and action 1 During group operation with Same as mentioned in “A7” of the previous 4. If displayed address or attribute is indoor unit of multi- refrigerant remote controller, indoor unit detects page system, if indoor unit transmit...
Page 60: Troubleshooting Of Problems
Error Code Abnormal points and detection method Case Judgment and action 1 Transmitting condition repeats 1 Check transmission wave form or noise on M-NET NO RESPONSE fault because of noise and the Abnormal if a message was transmitted transmission wire. like.
Page 61 Phenomena Factor Countermeasure 1 The pair number settings of the wireless remote 4. Even controlling by the wireless 1 Check the pair number settings. remote controller, no beep is heard controller and indoor controller board are and the unit does not start operating. mismatched.
Page 62 Symptoms: “PLEASE WAIT” is kept being displayed on the remote controller. Inspection method and Diagnosis flow Cause 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 63: Symptoms: Nothing Is Displayed On The Remote Controller
LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller 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 64 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller 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 65 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller LED1 : LED2 : LED3 : — Inspection method and Diagnosis flow Cause troubleshooting Check the voltage of the terminal block (TB6) of the remote controller. DC 10V to DC 16V? •...
Page 66 • Before repair Frequent calling from customers Phone Calls From Customers How to Respond Note Unit does The operating display of remote Check if power is supplied to air conditioner. not operate controller does not come on. Nothing appears on the display unless power is at all.
Page 67 Phone Calls From Customers How to Respond Note The room cannot be cooled or heated sufficiently. Check the set temperature of remote controller. The outdoor unit cannot be operated if the set temperature is not appropriate. The outdoor unit operates in the following modes. COOL: When the set temperature is lower than the room temperature.
Page 68 Phone Calls From Customers How to Respond Note Something Air blows out for a while after However, this control is also This is not a malfunction. is wrong HEAT operation is stopped. applied to the models which The blower is operating just for cooling down the with the heated-up air conditioner.
Page 69 Phone Calls From Customers How to Respond Note A white mist is expelled from the indoor unit. This is not a malfunction. This may occur when the operation gets started in the room of high humidity. Water or moisture is expelled from the outdoor Cooling;...
Page 70 11-6. HOW TO CHECK THE PARTS PUHZ-P100/125/140VHA2.UK PUHZ-P125/140VHA2 PUHZ-P100/125/140VHA3.UK PUHZ-P100/125/140VHA3R1.UK PUHZ-P100/125/140VHA3R2.UK PUHZ-P125/140VHA3R3.UK PUHZ-P100VHA4.UK PUHZ-P100/125/140YHA.UK PUHZ-P100/125/140YHAR1.UK PUHZ-P125/140YHAR2.UK PUHZ-P100YHA2.UK Parts name Check points Thermistor (TH3) Disconnect the connector then measure the resistance with a tester. <Outdoor Pipe>, (At the ambient temperature 10 - 30 ) <Liquid>...
Page 71 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. (It causes trouble of the outdoor controller circuit board and fan motor.) Self check...
Page 72 11-7. HOW TO CHECK THE COMPONENTS <Thermistor feature chart> Low temperature thermistors • Thermistor <Outdoor pipe>, <Liquid> (TH3) • Thermistor <Outdoor 2-Phase Pipe>, <2-Phase Pipe> (TH6) • Thermistor <Outdoor>, <Ambient> (TH7) Thermistor R0 = 15k' ± 3% B constant = 3480 ± 2% =15exp{3480( 273+t –...
Page 73: 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. <Connection between the outdoor controller board and the linear expansion valve>...
Page 74 (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 75: Emergency Operation
11-8. EMERGENCY OPERATION (1) When the error codes shown below are displayed on outdoor unit or microcomputer for wired remote controller or indoor unit has a failure, but no other problems are found, emergency operation will be available by setting the emergency operation switch (SWE) on indoor controller board to ON and short-circuiting the connector (CN31) on outdoor controller board.
Page 76 (5) Operation data during emergency operation During emergency operation, no communication is performed with the indoor unit, so the data items needed for operation are set to the following values: Operation mode Operation data Remarks COOL HEAT Intake temperature (TH1) 20.5 Indoor liquid pipe temperature (TH2) Indoor 2-phase pipe temperature (TH5)
Page 77: Test Point Diagram Outdoor Controller Circuit Board
11-9. TEST POINT DIAGRAM <CAUTION> CNF1 and CNF2 are high voltage. Outdoor controller circuit board PUHZ-P100VHA2.UK PUHZ-P125VHA2.UK PUHZ-P140VHA2.UK PUHZ-P125VHA2 PUHZ-P140VHA2 PUHZ-P100VHA3.UK PUHZ-P125VHA3.UK PUHZ-P140VHA3.UK PUHZ-P100VHA3R1.UK PUHZ-P125VHA3R1.UK PUHZ-P140VHA3R1.UK CN51 CNDM External signal output Forced defrost, 1 to 2: Input of low-level sound priority mode •...
Page 78 <CAUTION> TEST POINT 1 is high voltage. Outdoor controller circuit board PUHZ-P100VHA3R2.UK PUHZ-P125VHA3R2.UK PUHZ-P140VHA3R2.UK PUHZ-P100VHA4.UK PUHZ-P125VHA3R3.UK PUHZ-P140VHA3R3.UK PUHZ-P100YHA.UK PUHZ-P125YHA.UK PUHZ-P140YHA.UK PUHZ-P100YHAR1.UK PUHZ-P125YHAR1.UK PUHZ-P140YHAR1.UK PUHZ-P100YHA2.UK PUHZ-P125YHAR2.UK PUHZ-P140YHAR2.UK CN51 CNDM External signal output 1 to 2: Input of low-level sound priority mode Forced defrost, •...
Page 79 Outdoor noise filter circuit board PUHZ-P100VHA2.UK PUHZ-P125VHA2.UK PUHZ-P140VHA2.UK PUHZ-P125VHA2 PUHZ-P140VHA2 PUHZ-P100VHA3.UK PUHZ-P125VHA3.UK PUHZ-P125VHA3.UK PUHZ-P100VHA3R1.UK PUHZ-P125VHA3R1.UK PUHZ-P125VHA3R1.UK CN52C 52C driving signal (Connect to the outdoor controller circuit board (CN52C)) LO, NO Voltage of 230V AC is output (Connect to the outdoor...
Page 80 Outdoor noise filter circuit board PUHZ-P100YHA.UK PUHZ-P125YHA.UK PUHZ-P140YHA.UK PUHZ-P100YHAR1.UK PUHZ-P125YHAR1.UK PUHZ-P140YHAR1.UK PUHZ-P125YHAR2.UK PUHZ-P140YHAR2.UK LI1, LI2, LI3, NI POWER SUPPLY LI1-LI2/LI-LI3/LI3-LI1 : AC400 V input LI1-NI/LI2-NI/LI3-NI : AC230 V input (Connect to the terminal block (TB1)) Connect to the earth CNAC1, CNAC2 AC230V (Connect to the outdoor controller...
Page 81 Outdoor noise filter circuit board PUHZ-P100YHA2.UK LI1, LI2, LI3, NI POWER SUPPLY LI1-LI2/LI-LI3/LI3-LI1 : AC400V input LI1-NI/LI2-NI/LI3-NI : AC230V input (Connect to the terminal block (TB1)) Connect to the earth Connect to the earth CNAC2 AC230V (Connect to the outdoor controller circuit board (CNAC)) CNDC (Connect to the...
Page 82 Outdoor power circuit board Brief Check of POWER MODULE * Usually, they are in a state of being short-circuited if they are broken. PUHZ-P100VHA2.UK Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken.
Page 83 Outdoor power circuit board Brief Check of POWER MODULE * Usually, they are in a state of being short-circuited if they are broken. PUHZ-P100VHA3R2.UK Measure the resistance in the following points (connectors, etc.). PUHZ-P100VHA4.UK If they are short-circuited, it means that they are broken. 1.
Page 84 Outdoor power circuit board Brief Check of POWER MODULE * Usually, they are in a state of being short-circuited if they are broken. PUHZ-P100YHA.UK Measure the resistance in the following points (connectors, etc.). PUHZ-P125YHA.UK If they are short-circuited, it means that they are broken. 1.
Page 85 Outdoor power circuit board Brief Check of POWER MODULE * Usually, they are in a state of being short-circuited if they are broken. PUHZ-P100YHA2.UK Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken. 1.
Page 86 Active filter module PUHZ-P100VHA2.UK PUHZ-P100VHA3.UK PUHZ-P100VHA3R1.UK PUHZ-P125VHA2 PUHZ-P125VHA3.UK PUHZ-P125VHA3R1.UK PUHZ-P140VHA2 PUHZ-P140VHA3.UK PUHZ-P140VHA3R1.UK Connect to the out- door power circuit board (TABP2) L1, L2 Connect to the DCL (Reactor) Non-connect Upper Lower side side Non-connect Connect to the outdoor power circuit board...
Page 87: Function Of Switches, Connectors And Jumpers
11-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS (1) Function of switches Type Action by the switch operation Function Effective timing Switch switch When compressor is working Compulsory defrosting *1 Start Normal in heating operation. * Abnormal history clear Clear Normal off or operating 1 2 3 4 5 6 1 2 3 4 5 6...
Page 88 (2) Function of connectors and switches Connector Action by open/short operation Types Function Effective timing Switch Short Open Connector CN31 Start Emergency operation When power supply ON Normal ■ The black square ( ) indicates a switch position. SW6-1 Service Ref. SW5-6 Service Ref.
Page 89 <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 90 Indication Error Error Outdoor controller board Detailed Contents Inspection method code reference LED1 (Green) LED2 (Red) page 3 blinking 1 blinking Check if stop valves are open. P.51 Abnormality of shell thermostat Check if connectors (TH4, LEV-A) on outdoor controller board are not and discharging temperature (TH4) disconnected.
Page 91 <Outdoor unit operation monitor function> [When option 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 error code by control- ling DIP SW2 on ‘A-Control Service Tool’.
Page 92 The black square (■) indicates a switch position. SW2 setting Display detail Explanation for display Unit −40 - 90 Pipe temperature/Liquid(TH3) −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 93 The black square (■) indicates a switch position. SW2 setting Display detail Explanation for display Unit Operation mode on error occurring Operation mode of when operation stops due to error is displayed by setting SW2 like below. Code (SW2) display 2 3 4 5 6 2 3 4 5 6 −40 - 90...
Page 94 The black square (■) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 - 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 95 The black square (■) indicates a switch position. SW2 setting Display detail Explanation for display Unit Indoor setting temperature 17 - 30 17 - 30 2 3 4 5 6 −39 - 88 Outdoor pipe temperature/2-phase (TH6) −39 - 88 (When the temperature is 0: or less, “–”...
Page 96 The black square (■) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 - 100 Capacity save (When the capacity is 100% hundreds digit, tens digit 0 - 100 and ones digit are displayed by turns.) When air conditioner is connected to (Example) When 100%;...
Page 97 The black square (■) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 - 480 LEV-A opening pulse on error occurring (When it is 100 pulse or more, hundreds digit, tens 0 - 480 digit and ones digit are displayed by turns.) (Example) When 130 pulse;...
Page 98 The black square (■) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 - 255 Discharge super heat on error occurring (When the temperature is 100°C or more, hundreds digit, tens digit and ones digit are displayed by 0 - 255 turns.) (Example) When 150°C;...
Page 99: Function Setting
FUNCTION SETTING 12-1. UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER Each function can be set as necessary using the remote controller. The setting of function for each unit can only be done by the remote controller. Select function available from the table 1. <Table 1>...
Page 100 (2) Functions available when setting the unit number to 01-03 or AL (07 in the case of wireless remote controller) • When setting functions for an indoor unit in an independent system, set the unit number to 01 referring to 4 setting the indoor unit number of Operating Procedure.
Page 101: Service Menu
12-1-1. Selecting functions using the wired remote controller <PAR-31MAA> <Service menu> Maintenance password is required Select "Service" from the Main menu, and press the button. Main Main menu Maintenance Initial setting *At the main display, the menu buttom and select "Service" to make the Service maintenance setting.
Page 102 <Function setting> Select "Service" from the Main menu, and press the button. Test run Input maintenance info. Function setting Check Self check Select "Function setting" with the F1 or F2 button, and press the button. Set the indoor unit refrigerant addresses and unit numbers with the F1 Function setting Ref.
Page 103 12-1-2. Selecting functions using the wired remote controller <PAR-21MAA> First, try to familiarize yourself with the flow of the function selection procedure. In this section, an example of setting the room temperature detection position is given. For actual operations, refer to steps Setting number Refrigerant address Unit number...
Page 104 [Operating Procedure] Check the setting items provided by function selection. If settings for a mode are changed by function selection, the functions of that mode will be changed accordingly. Check all the current settings according to steps , fill in the "Check" column in Table 1, and then change them as necessary. For factory settings, refer to the indoor unit's installation manual. Switch off the remote controller.
Page 105 12-1-3. Selecting functions using the wireless remote controller (Type C) Functions can be selected with the wireless remote controller. Function selection using wireless remote controller is available only for refriger- ant system with wireless function. Refrigerant address cannot be specified by the wireless remote controller. [Flow of function selection procedure] The flow of the function selection procedure is shown below.
Page 106 12-2. FUNCTION SELECTION OF REMOTE CONTROLLER 12-2-1. PAR-31MAA The functions of the function buttons change depending on the screen. Refer to the button function guide that appears at the bottom of the LCD for the functions they serve on a given screen.
Page 107 <Menu structure of PAR-31MAA> Press the button. MENU Main menu Move the cursor to the desired item with the buttons, and press the SELECT button. Vane · Louver · Vent. (Lossnay) High power Timer On / Off timer Auto-Off timer Filter information Error information Weekly timer...
Page 108 <Main menu list of PAR-31MAA> Setting and display items Setting details Vane · Louver · Vent. Use to set the vane angle. (Lossnay) • Select a desired vane setting from ﬁ ve different settings. Use to turn ON / OFF the louver. •...
Page 109 Setting and display items Setting details Initial setting Display Make the settings for the remote controller related items as necessary. details Clock: The factory settings are "Yes" and "24h" format. Temperature: Set either Celsius (°C) or Fahrenheit (°F). Room temp. : Set Show or Hide. Auto mode: Set the Auto mode display or Only Auto display.
Page 110 12-2-2. PAR-21MAA The setting of the following remote controller functions can be changed using the remote controller function selection mode. Change the setting when needed. Item 1 Item 2 Item 3 (Setting content) 1.Change Language Language setting to display • Display in multiple languages is possible. ("CHANGE LANGUAGE") 2.Function limit (1) Operation function limit setting (operation lock) ("LOCKING FUNCTION")
Page 111 [Function selection flowchart] Normal display (Display when the air conditioner is not running) Setting language (English) Hold down the button and press the button for 2 seconds. Hold down the button and press the button for 2 seconds. Press the operation mode button. Press theTIMER MENU button.
Page 112: Easy Maintenance Function
EASY MAINTENANCE FUNCTION 13-1. SMOOTH MAINTENANCE 13-1-1. PAR-31MAA Maintenance data, such as the indoor/outdoor unit’s heat exchanger temperature and compressor operation current can be displayed with “Smooth maintenance”. * This cannot be executed during test operation. * Depending on the combination with the outdoor unit, this may not be supported by some models. Select "Service"...
Page 113 13-1-2. PAR-21MAA Reduces maintenance work drastically. Enables you to check operation data of the indoor and outdoor units by remote controller. Furthermore, use of maintenance stable-operation control that fixes the operating frequency, allows smooth inspection, even for inverter models. Smooth Mainte- Discharge temperature 64 Conventional inspection work nance Function...
Page 114 Data measurement When the operation is stabilized, measure operation data as explained below. (4) Press the [TEMP] buttons ( ) to select the desired refrigerant address. [Screen (5) Select the type of data to be displayed. After selecting, go to step (6). Compressor information button MENU...
Page 115 13-3. GUIDE FOR OPERATION CONDITION Check Points Inspection item Result Breaker Good Retightened Enter the temperature differences between into Terminal block Outdoor Unit Good Retightened the graph given below. Indoor Unit Good Retightened Operation state is determined according to the plotted areas on (Insulation resistance) the graph.
Page 116: 14 Monitoring The Operation Data By The Remote Controller
14 MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER 14-1. HOW TO "MONITOR THE OPERATION DATA" 14-1-1. PAR-31MAA Details on the operation data including each thermistor temperature and error history can be conﬁ rmed with the remote controller. Select "Service" from the Main menu, and press the button.
Page 117 14-1-2. PAR-21MAA • Turn on the [Monitoring the operation data] Example) Request code "004" Discharge temperature 69 Refrigerant address "00" B: Refrigerant address C: Data display area D: Request code display area (1) Press the button for 3 seconds so that [ Maintenance mode] appears on the screen (at TEST (2) Press the button for 3 seconds to switch to [Maintenance monitor].
Page 118 14-2. REQUEST CODE LIST * Certain indoor/outdoor combinations do not have the request code function; therefore, no request codes are displayed. Description Request content Unit Remarks (Display range) Operation state Refer to 14-2-1. Detail Contents in Request Code. – Compressor-Operating current (rms) 0 –...
Page 119 Description Request content Unit Remarks (Display range) Indoor unit-Control state – Refer to 14-2-1.Detail Contents in Request Code. Outdoor unit-Control state – Refer to 14-2-1.Detail Contents in Request Code. Compressor-Frequency control state Refer to 14-2-1.Detail Contents in Request Code. – Outdoor unit-Fan control state Refer to 14-2-1.Detail Contents in Request Code.
Page 120 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 121 Description Request content Unit Remarks (Display range) Indoor-Fan operating time 0 – 9999 1 hour (After filter is reset) Indoor-Total operating time 0 – 9999 10 hours (Fan motor ON time) Indoor fan output value (Sj value) 0 – 255 Fan control data –...
Page 122 14-2-1. Detail Contents in Request Code Example) Request code "004" Discharge temperature 69 Refrigerant address "00" B: Refrigerant address C: Data display area D: Request code display area [Operation state] (Request code :"0") Relay output state Power currently Data display Display Compressor Four-way valve Solenoid valve...
Page 123 [Fan control state] (Request code :" 53 ") Data display Fan step correction value by heatsink temperature overheat prevention control Fan step correction value by cool condensation temperature overheat prevention control Display Correction value - (minus) – 1 [Actuator output state] (Request code :"54") Data display Actuator output state Actuator output state...
Page 124 [Contact demand capacity] (Request code :"61") Setting content Data display Setting Display Setting value Setting content SW7-1 SW7-2 100% [External input state] (Request code :"62") Input state : Input present Data display Contact demand Silent mode Spare 1 Spare 2 Display Input state input...
Page 125 [Outdoor unit switch setting display (SW1 to SW10, except SW3)] Request codes: 73 to 82 0: Switch OFF 1: Switch ON 0: Switch OFF 1: Switch ON SW1, SW2, SW6, SW7 Data display Data display 00 00 00 00 00 01 00 01 00 02 00 02...
Page 126 [Indoor unit – Model setting information] (Request code :"162") Data display Display Model setting state Display Model setting state PSA-RP•GA, PSH-PGAH PKA-RP•FAL(2), PKH-P•FALH See the table on the right. PEAD-RP•EA(2)/GA, PEHD-P•EAH PCA-RP•GA(2), PCH-P•GAH, PLA-RP•BA, PLA-RP71/100/125BA2 SEZ-KA•VA SLZ-KA•VA(L) PCA-RP•HA PCA-RP•KA PKA-RP•GAL, PKH-P•GALH PLA-RP•...
Page 127: Disassembly Procedure
DISASSEMBLY PROCEDURE PUHZ-P100VHA2.UK PUHZ-P100VHA3.UK PUHZ-P100VHA3R1.UK PUHZ-P100VHA3R2.UK PUHZ-P100VHA4.UK PUHZ-P100YHA.UK PUHZ-P100YHAR1.UK PUHZ-P100YHA2.UK OPERATING PROCEDURE PHOTOS & ILLUSTRATION 1. Removing the service panel and top panel Figure 1 (1) Remove 3 service panel fixing screws (5 × 12) and slide Top panel fixing screws...
Page 128 Lead wire of thermistor Sensor holder <(Outdoor)2-Phase Pipe>. <Outdoor>, <Ambient> (TH7) Photo 7 (PUHZ-P100VHA2 / VHA3(R1)) 6. Removing the thermistor <Outdoor pipe>, <Liquid> (TH3), thermistor <Discharge> (TH4) and thermistor <Comp. surface> (TH32) (1) Remove the service panel. (See Figure 1)
Page 129 OPERATING PROCEDURE PHOTOS 7. Removing the 4-way valve coil (21S4), LEV coil (LEV(A)) Photo 8 4-way valve coil (1) Remove the service panel. (See Figure 1) LEV coil (LEV A) fixing screw (2) Remove the top panel. (See Figure 1) (3) Remove the electrical parts box.
Page 130 High pressure switch (63H) 11. Removing the reactor (DCL) (PUHZ-P100V) Photo 11 (PUHZ-P100VHA2.UK) (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) Reactor fixing screw (3) Remove the electrical parts box.
Page 131 OPERATING PROCEDURE PHOTOS 12. Removing the compressor (MC) Photo 12 Electrical parts box (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) (3) Remove 2 front cover panel fixing screws (5 × 12) and remove the front cover panel.
Page 132 PUHZ-P125/140VHA2.UK PUHZ-P125/140VHA2 PUHZ-P125/140VHA3.UK PUHZ-P125/140VHA3R1.UK PUHZ-P125/140VHA3R2.UK PUHZ-P125/140VHA3R3.UK PUHZ-P125/140YHA.UK PUHZ-P125/140YHAR1.UK PUHZ-P125/140YHAR2.UK OPERATING PROCEDURE PHOTOS & ILLUSTRATION 1. Removing the service panel and top panel Figure 1 (1) Remove 3 service panel fixing screws (5 × 12) and slide Top panel fixing screws Top panel the hook on the right downward to remove the service panel.
Page 133 From the previous page. OPERATING PROCEDURE PHOTOS Photo 4 (PUHZ-P125,140Y) Electrical parts box fixing screws Terminal block (TB1) Terminal block (TB2) 4. Removing the thermistor <Outdoor 2-Phase Pipe> (TH6) Photo 5 Thermistor <Outdoor 2-phase pipe> (TH6) (1) Remove the service panel. (See Figure 1) (2) Remove the top panel.
Page 134 OPERATING PROCEDURE PHOTOS Photo 8 7. Removing the 4-way valve coil (21S4), and LEV coil (LEV(A)) (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) LEV coil (LEV A) [Removing the 4-way valve coil] (3) Remove 4-way valve solenoid coil fixing screw (M5 ×...
Page 135 OPERATING PROCEDURE PHOTOS 10. Removing bypass valve coil (SV) and bypass valve Photo 9 (1) Remove the service panel. (See Figure 1) (2) Remove the top panel. (See Figure 1) (3) Remove 3 right side panel fixing screws (5 × 12) in the rear of the unit and remove the right side panel.
Page 136 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2007 MITSUBISHI ELECTRIC CORPORATION Distributed in Dec. 2012 No.OCH415 REVISED EDITION-F Distributed in Apr. 2010 No.OCH415 REVISED EDITION-E PDF 4 Distributed in Nov. 2009 No.OCH415 REVISED EDITION-D PDF 6 Distributed in Jul.

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