SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS SERVICE MANUAL Outdoor unit [Model Name] PUZ-A12NKA7 PUZ-A18NKA7 PUZ-A24NHA7 PUZ-A30NHA7 PUZ-A36NKA7 PUZ-A42NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS PUZ-A24NHA7-BS PUZ-A30NHA7-BS PUZ-A36NKA7-BS PUZ-A42NKA7-BS PUY-A12NKA7 PUY-A18NKA7 PUY-A24NHA7 PUY-A30NHA7 PUY-A36NKA7 PUY-A42NKA7 PUY-A12NKA7-BS PUY-A18NKA7-BS PUY-A24NHA7-BS PUY-A30NHA7-BS PUY-A36NKA7-BS PUY-A42NKA7-BS September 2019 No. OCH636 R410A REVISED EDITION-B [Service Ref.
1 REFERENCE MANUAL INDOOR UNIT Model name Service Ref. PLA-A12/18/24/30/36/42EA7 PLA-A12/18/24/30/36/42EA7 OCH640 OCB640 PCA-A24/30/36/42KA7 PCA-A24/30/36/42KA7.TH OCH638 OCB638 PKA-A12/18HA7 PKA-A12/18HA7 OCH637 OCB637 PKA-A24/30/36KA7 PKA-A24/30/36KA7.TH OCH639 OCB639 PEAD-A12/18/24/30/36/42AA7 PEAD-A12/18/24/30/36/42AA7 ― PVA-A12/18/24/30/36/42AA7 PVA-A12/18/24/30/36/42AA7 ― 2 Service manual No. SAFETY PRECAUTION 2-1.
2-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Use new refrigerant pipes. In the case of using the existing pipes for R22, be careful with the following: · Be sure to clean the pipes and make sure that the insides of the pipes are clean. · Change flare nut to the one provided with this product. Use a newly flared pipe. · Avoid using thin pipes.
[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.
2-4. 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.
2-5. LOW AMBIENT COOLING Precautions for low ambient cooling • If the outdoor temperature is 23°F or lower during cooling operation, install an optional air guide to prevent wind from blowing into the outdoor unit. • Install the outdoor unit in a location where wind will not blow onto the back of the unit. • To prevent damage to the parts, be sure to install the unit, turn on the main power, and perform service in an environment where the ambient temperature is 0°F or higher.
3 FEATURES PUZ-A12NKA7 PUZ-A18NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS PUY-A12NKA7 PUY-A18NKA7 PUY-A12NKA7-BS PUY-A18NKA7-BS PUZ-A24NHA7 PUZ-A30NHA7 PUZ-A24NHA7-BS PUZ-A30NHA7-BS PUY-A24NHA7 PUY-A30NHA7 PUY-A24NHA7-BS PUY-A30NHA7-BS PUZ-A36NKA7 PUZ-A42NKA7 PUZ-A36NKA7-BS PUZ-A42NKA7-BS PUY-A36NKA7 PUY-A42NKA7 PUY-A36NKA7-BS PUY-A42NKA7-BS CHARGELESS SYSTEM PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT.
4 SPECIFICATIONS PUZ-A12NKA7 PUZ-A18NKA7 PUZ-A24NHA7 PUZ-A30NHA7 PUZ-A36NKA7 PUZ-A42NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS PUZ-A24NHA7-BS PUZ-A30NHA7-BS PUZ-A36NKA7-BS PUZ-A42NKA7-BS Service Ref. Power supply Phase Frequency Voltage MCA MOCP Breaker size External finish Heat exchanger Defrost method Crankcase heater Compressor Model Motor output R.L.A L.R.A Starter type Fan Fan (drive) × No. Fan motor output Fan motor Airflow Single 60 Hz 208/230 V 19 19 25 25 26 26 31 31 25 25 30 30 Munsell 3Y 7.8/1.
PUY-A12NKA7 PUY-A18NKA7 PUY-A24NHA7 PUY-A30NHA7 PUY-A36NKA7 PUY-A42NKA7 PUY-A12NKA7-BS PUY-A18NKA7-BS PUY-A12NHA7-BS PUY-A30NHA7-BS PUY-A36NKA7-BS PUY-A42NKA7-BS Service Ref. Power supply Phase Frequency Voltage MCA MOCP Breaker size External finish Heat exchanger Defrost method Crankcase heater Compressor Model Motor output R.L.A L.R.A Starter type Fan Fan (drive) × No. Fan motor output Fan motor Airflow Single 60 Hz 208/230 V 19 19 25 25 26 26 31 31 25 25 30 30 Munsell 3Y 7.8/1.
DATA 5 5-1. REFILLING REFRIGERANT CHARGE (R410A: oz, kg) Service Ref. Piping length (one way) Factory charged 50 ft 60 ft 70 ft 80 ft 90 ft 100 ft 110 ft 120 ft 130 ft 140 ft 150 ft 160 ft 165 ft 170 ft 180 ft 190 ft 200 ft 210 ft 220 ft 225 ft 15 m 18 m 21 m 24 m 27 m 30 m 33 m 37 m 40 m 43 m 46 m 49 m 50 m 52 m 55 m 58 m 61 m 64 m 67 m 69 m PUZ-A12NKA7 PUZ-A12NKA7-BS 71 oz 71 oz 71 oz 73 oz 75 oz 77 oz ― ― ― ― ― ― ― ― ― ― ― ― ― ― 71 oz 2.
5-3. NOISE CRITERION CURVES MODE SPL(dB) COOLING 44 HEATING 46 LINE PUZ-A24/30NHA7(-BS) PUY-A24/30NHA7(-BS) OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar) 90 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 10 63 NC-20 125 250 500 1000 2000 4000 BAND CENTER FREQUENCIES, Hz PUZ-A36/42NKA7(-BS) PUY-A36/42NKA7(-BS) OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar) OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.
5-4. STANDARD OPERATION DATA 5-4-1. Heat pump Outdoor side Indoor side Outdoor side Indoor side Electrical circuit Electrical circuit Representative matching Mode Total Capacity Input Indoor unit model Phase Cycle Voltage Current Outdoor unit model Phase Cycle Voltage Current Discharge pressure Suction pressure Discharge temperature Condensing temperature Suction temperature Ref. pipe length Discharge pressure Suction pressure Discharge temperature Condensing temperature Suction temperature Ref.
5-4-2. Cooling only Btu/h W Outdoor side Indoor side Outdoor side Indoor side Electrical circuit Electrical circuit Representative matching Mode Total Capacity Input Indoor unit model Phase Cycle Voltage Current Outdoor unit model Phase Cycle Voltage Current Discharge pressure Suction pressure Discharge temperature Condensing temperature Suction temperature Ref. pipe length Discharge pressure Suction pressure Discharge temperature Condensing temperature Suction temperature Ref.
OUTLINES AND DIMENSIONS 6 PUZ-A12NKA7 PUZ-A18NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS PUY-A12NKA7 PUY-A12NKA7-BS PUY-A18NKA7 PUY-A18NKA7-BS Unit: mm 48<1-29/32> 404.5<15-15/16> drain hole ø 42 Air intake Installation bolt pitch 2-U Shaped notched holes (Foundation Bolt M10) Air discharge 32.5<1-9/32> Air intake 330<13> 360<14-3/16> 300<11-13/16> 500<19-11/16> 40 <1-19/32> 2-10×21 oval hole (Foundation Bolt M10 ) 22 <7/8> 22.3 <29/32> 23.
Min.100mm <3-15/16> Min. 10mm <3/8> Dimensions of space needed for service access are shown in the below diagram. 500 <19-11/16> Service space Min. 10 <13> Min. Front piping hole (knockout) 65<2-9/16> 92<3-5/8> ø 92 <3-5/8> 45<1-25/32> 500 <19-11/16> 19<3/4> 75 <2-31/32> ø 92 <3-5/ 8> 45<1-25/32> Rear piping hole (knockout) 3 ø92 < 65 <2-9/16> -5/8> Power supply wiring hole (2- ø27<1-1/16>knockout) Rear trunking hole (knockout) 92<3-5/18> 40<1-9/16> 40<1-9/16> 2-ø22.
FREE Min. 1000mm <39-3/8> Service space Min. 150mm <5-29/32> Front piping hole (Knockout) ø 92 <3-5/8> Conduit hole (ø 37<1-15/32>knockout) Front trunking hole (Knockout) 60 <2-3/8> 92 <3-5/8> 75 <2-15/16> Conduit hole (ø 24<15/16>knockout) 55 <2-3/16> 53 <2-3/32> Right piping hole (Knockout) Piping Knockout Hole Details Min. 15 <3/5> Handle for moving 1 ... Refrigerant GAS pipe connection (FLARE) ø15.88(5/8F) ... 2 Refrigerant LIQUID pipe connection (FLARE) ø9.52(3/8F) *1 ...
7 WIRING DIAGRAM PUZ-A12NKA7 PUZ-A18NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS OCH636B 17 PUY-A12NKA7 PUY-A12NKA7-BS PUY-A18NKA7 PUY-A18NKA7-BS
PUZ-A24NHA7 PUZ-A30NHA7 PUZ-A24NHA7-BS PUZ-A30NHA7-BS OCH636B PUY-A24NHA7 PUY-A24NHA7-BS 18 PUY-A30NHA7 PUY-A30NHA7-BS
PUZ-A36NKA7 PUZ-A42NKA7 PUZ-A36NKA7-BS PUZ-A42NKA7-BS OCH636B 19 PUY-A36NKA7 PUY-A36NKA7-BS PUY-A42NKA7 PUY-A42NKA7-BS
WIRING SPECIFICATIONS 8 8-1. INDOOR UNIT POWER SUPPLIED FROM OUTDOOR UNIT (A-control application) The following connection patterns are available. The outdoor unit power supply patterns vary on models.
9 REFRIGERANT SYSTEM DIAGRAM PUZ-A12NKA7 PUZ-A18NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS <4-way valve solenoid coil> Heating: ON Cooling: OFF 4-way valve Stop valve (with service port) Refrigerant GAS pipe [1/2 [12.
PUY-A12NKA7 PUY-A12NKA7-BS PUY-A18NKA7 PUY-A18NKA7-BS Unit: inch [mm] Thermistor TH7 (Outdoor) Heat exchanger Stop valve (with service port) Refrigerant GAS pipe [1/2 [12.7 mm] Thermistor TH6 (Outdoor 2-phase pipe) Charge plug Strainer #50 Thermistor TH3 (Outdoor pipe) Muffler Distributor High pressure switch 63H Thermistor TH4 (Discharge) Thermistor TH32 (Suction) Strainer #100 Linear expansion valve B Stop valve Refrigerant LIQUID pipe [1/4 [6.35 mm] Thermistor TH33 (Comp.
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 “CENTRALLY CONTROLLED” is displayed, the refrigerant collecting (pump down) cannot be completed normally. • Startup of the indoor-outdoor communication takes about 3 minutes after the power (circuit breaker) is turned on.
10 TROUBLESHOOTING 10-1. TROUBLESHOOTING Present and past check codes are logged, and they can be 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 in the field, are summarized in the table below. Check the contents below before investigating details.
10-2-1. Test run for wired remote controller MENU MENU ON OFF RETURN SELECT HOLD RETURN SELECT ON/OFF Function buttons F1 1 Select "Service" from the Main menu, and press the [SELECT] button. Select "Test run" with the F1 or F2 button, and press the [SELECT] button. F2 F3 F4 Service menu Test run Input maintenance info.
When an error occurs, the following screen will appear. Check the error status, stop the operation, and consult your dealer. 1 Check code, error unit, refrigerant address, unit model name, and serial number will appear. (Date and time of occurrence of the error will also appear on PAR-4xMAA.) The model name and serial number will appear only if the information has been registered. Error information Error code A3 Error unit IU Unit#1 Time Occurred 2/ 1 4:48 Model name Serial No.
While no errors are occurring, page 2/2 of the error information can be viewed by selecting "Error information" from the Maintenance menu (PAR-4xMAA) or Main menu (PAR-3xMAA). Errors cannot be reset from this screen. Maintenance menu Error information Filter information Cleaning Main menu: RETURN Cursor F1 F2 F3 F4 ON OFF MENU RETURN SELECT HOLD Service menu 1 Select "Service" from the Main menu, and press the [SELECT] button.
Test run [for IR wireless remote controller] TEST RUN COOL TEMP ON/OFF 7 FAN AUTO STOP VANE AUTO START 5 MODE 6 3,4 CHECK LOUVER min TEST RUN 2 SET h RESET OCH636B CLOCK Measure an impedance between the power supply terminal block on the outdoor unit and ground with a 500 V Megger and check that it is equal to or greater than 1.0 M". 1 Turn on the main power to the unit. TEST RUN 2 Press the button twice continuously.
10-3. HOW TO PROCEED "SELF-DIAGNOSIS" 10-3-1. Self-diagnosis 1 Select "Service" from the Main menu, Diagnosis Self check Remote controller check and press the [SELECT] button. elect "Check" from the Service menu, S and press the [SELECT] button. Service menu: MENU Cursor elect "Diagnosis" from the Check menu, S and press the [SELECT] button. F1 Select "Self check" with the F1 or F2 button, and press the [SELECT] button.
10-3-2. Remote controller check If operations cannot be completed with the remote controller, diagnose the remote controller with this function. 1 Select "Service" from the Main menu, and press the [SELECT] button. elect "Check" from the Service menu, S and press the [SELECT] button. Diagnosis Self check Remote controller check Service menu: MENU Cursor elect "Diagnosis" from the Check menu, S and press the [SELECT] button.
10-4. SELF-DIAGNOSIS ACTION TABLE Note: Refer to indoor unit section for code P and code E. Check code Abnormal points and detection method Cause judgment and action 1 No voltage is supplied to terminal 1 Check following items. a) Power supply breaker block (TB1) of outdoor unit. b) Connection of power supply terminal block a) Power supply breaker is (TB1) turned off.
Check code Abnormal points and detection method F5 (5201) EA (6844) Eb (6845) EC (6846) Cause 63H connector open 1 Disconnection or contact failure of 63H connector on outdoor Abnormal if 63H connector circuit is open for controller circuit board 3 minutes continuously after power supply. 63H: High-pressure switch 2 Disconnection or contact failure of 63H 3 63H is working due to defective parts.
Check code Abnormal points and detection method High pressure (High-pressure switch 63H operated) Abnormal if High-pressure switch 63H worked (*) during compressor operation. *602 PSIG [4.
Check code Abnormal points and detection method Cause Open/short circuit of outdoor unit temperature thermistor (TH4, TH33) Abnormal if open (−4˚F [−20°C] or less) or short (422˚F [217°C] or more) is detected during compressor operation. (Detection is inoperative for 10 minutes of compressor starting process and for 10 minutes after and during defrosting.) TH33: Thermistor
Check code Abnormal points and detection method Cause judgment and action To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2, and 2-6. Detailed Refer to "10-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS".
Check code Abnormal points and detection method Compressor overcurrent interruption (When compressor locked) Abnormal if overcurrent of DC bus or compressor is detected within 30 seconds after compressor starts operating. UF (4100) UH (5300) UL (1300) UP (4210) Cause 1 Stop valve is closed. 2 Decrease of power supply voltage 3 Looseness, disconnection or reverse of compressor wiring connection 4 Defective compressor judgment and action 1 Open stop valve. 2 Check facility of power supply.
Check code Abnormal points and detection method E0 or E4 (6831, 6834) E1 or E2 (6832, 6833) E3 or E5 (6201, 6203) E6 (6840) Cause judgment and action Remote controller transmission error 1 Contact failure at transmission 1 Check disconnection or looseness of indoor wire of remote controller unit or transmission wire of remote controller. (E0)/signal receiving error (E4) (1) Abnormal if main or sub remote control- 2 All remote controllers are set 2 Set one of the remote controllers “main”.
Check code Abnormal points and detection method E8 (6840) E9 (6841) EF (6607 or 6608) Ed (0403) P8 Cause judgment and action Indoor/outdoor unit communication error 1 Contact failure of indoor/outdoor unit connecting wire (Signal receiving error) (Outdoor unit) 2 Defective communication circuit (1) Abnormal if outdoor controller circuit of outdoor controller circuit board board could not receive anything nor3 Defective communication circuit mally for 3 minutes.
Check code Abnormal points and detection method PL Abnormal refrigerant circuit During Cooling, Dry, or Auto Cooling operation, the following conditions are regarded as failures when detected for 1 second. a) The compressor continues to run for 30 or more seconds. b) The liquid pipe temperature or the condenser/evaporator temperature is 167˚F [75°C] or more. These detected errors will not be cancelled until the power source is reset.
Check code Abnormal points and detection method NO ACK signal (1) Transmitting side controller detects abnormal if a message was transmitted but there is no reply (ACK) that a message was received. Transmitting side detects abnormality every 30 seconds, 6 times continuously. Note: The address and attribute displayed at remote controller is indicate the controller that did not reply (ACK). A7 (6607) Cause judgment and action Common factor that has no relation with abnormality source.
From the previous page. Check code Abnormal points and detection method Cause judgment and action Same as mentioned in "A7" of the previous 1 During sequential operation of indoor unit and FRESH FRESH MASTER, page. MASTER of other refrigerant Indoor unit detects abnormality when system, if indoor unit transmits indoor unit transmitted to FRESH to FRESH MASTER while outMASTER and there was no reply (ACK).
10-5. TROUBLESHOOTING OF PROBLEMS Phenomena Factor Countermeasure (1) Remote controller display does not 1 12 V DC is not supplied to remote controller. is not indicated on LCD.) (Power supply display 2 12–15 V DC is supplied to remote controller, however, no display is indicated. • “PLEASE WAIT” is not displayed. • “PLEASE WAIT” is displayed. (2) “PLEASE WAIT” display is 1 At longest 2 minutes after the power supply “PLEASE 1 Normal operation WAIT” is displayed to start up.
Phenomena (6) Remote controller display works normally and the unit performs cooling operation, however, the capacity cannot be fully obtained. (The air does not cool well.) Factor 1 Refrigerant shortage 2 Filter clogging 3 Heat exchanger clogging 4 Air duct short cycle 1 Linear expansion valve fault normally and the unit performs heat- Opening cannot be adjusted well due to linear ing operation, however, the capacity expansion valve fault. cannot be fully obtained.
Symptoms: “PLEASE WAIT” is kept being displayed on the remote controller. Diagnosis flow Cause Inspection method and troubleshooting Check the display time of “PLEASE WAIT” after turning on the main power. 6 minutes or more How long is “PLEASE WAIT” kept being displayed on the remote controller? 2 minutes or less 2 to 6 minutes Are any check codes displayed on the remote controller? Check the LED display of the outdoor controller circuit board.
Symptoms: Nothing is displayed on the remote controller. 1 Diagnosis flow Cause LED display of the indoor controller board LED1: LED2: LED3: Inspection method and troubleshooting Check the voltage between S1 and S2 on the terminal block (TB4) of the indoor unit. 198 to 264 V AC? YES NO Check the voltage among L1 and L2 on the terminal block (TB1) of the outdoor power circuit board. 198 to 264 V AC? NO • Troubles concerning power supply • Check the power wiring to the outdoor unit.
Symptoms: Nothing is displayed on the remote controller. 2 Diagnosis flow Cause LED display of the indoor controller board LED1: LED2: LED3: or Inspection method and troubleshooting Check the voltage between S1 and S2 on the terminal block (TB4) of the indoor unit. 198 to 264 V AC? NO YES Check the status of the indoor controller board LED3 display. Not lighting. Check the looseness or disconnection of the indoor/outdoor connecting wire.
Symptoms: Nothing is displayed on the remote controller. 3 Cause Diagnosis flow LED display of the indoor controller board LED1: LED2: or LED3: — Inspection method and troubleshooting Check the voltage of the terminal block (TB6) of the remote controller. 10 to 16 V DC? YES • Defective remote controller • Replace the remote controller. NO Check the status of the LED2.
• Before repair Frequent calls from customers Phone Calls From Customers How to Respond Note Unit does 1 The operating display of remote 1 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. supplied. 2 Unit cannot be restarted for a 2 Wait around 3 minutes to restart unit. while after it’s stopped. The air conditioner is in a state of being protected by the microprocessor’s directive.
Phone Calls From Customers How to Respond Note The room cannot be cooled or heated sufficiently. 1 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. HEAT: When the set temperature is higher than the room temperature. 2 Check if filters are not dirty and clogged.
Phone Calls From Customers Something 3 Air blows out for a while after is wrong HEAT operation is stopped. with the blower….. How to Respond Note 3 This is not a malfunction. The blower is operating just for cooling down the heated-up air conditioner. This will be done within 1 minute. This control is conducted only when the HEAT operation is stopped with the electric heater ON. However, this control is also applied to the models which has no electric heater.
Phone Calls From Customers How to Respond A white mist is expelled from the indoor unit. This is not a malfunction. This may occur when the operation is started in the room of high humidity. Water or moisture is expelled from the outdoor unit. COOL: when pipes or piping joints are cooled, they sweat and water drips down. HEAT: water drips down from the heat exchanger. Note: Use optional parts “Drain Socket” and “Drain pan” if these water needs to be collected and drained out for once.
10-6. HOW TO CHECK THE PARTS PUZ-A12NKA7 PUZ-A36NKA7 PUZ-A12NKA7-BS PUZ-A36NKA7-BS PUY-A12NKA7 PUY-A36NKA7 PUY-A12NKA7-BS PUY-A36NKA7-BS Parts name Thermistor (TH3) Thermistor (TH4) Thermistor (TH6) < 2-phase pipe> Thermistor (TH7) Thermistor (TH8) Thermistor (TH32) Thermistor (TH33)
10-6-1. Check method of outdoor controller circuit board PUZ-A12NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7 PUY-A12NKA7 PUZ-A18NKA7-BS PUY-A12NKA7-BS PUY-A18NKA7 PUY-A18NKA7-BS PNC board check Is the voltage of main incoming power 198–253 V AC? No Check the breaker and power supply. Yes Is the voltage of bus bar voltage (between DS1 "+" and "−") 280–350 V DC? No Turn off the incoming power supply and check the resistance of PTC1and PTC2 on the PNC board. Yes Yes PTC1 or PTC2 = open ? • Check wiring.
10-6-2. Check method of outdoor controller circuit board PUZ-A24NHA7 PUZ-A24NHA7-BS PUY-A24NHA7 PUY-A24NHA7-BS PUZ-A30NHA7 PUZ-A36NKA7 PUZ-A30NHA7-BS PUZ-A36NKA7-BS PUY-A30NHA7 PUY-A36NKA7 PUY-A30NHA7-BS PUY-A36NKA7-BS PUZ-A42NKA7 PUZ-A42NKA7-BS PUY-A42NKA7 PUY-A42NKA7-BS Outdoor controller circuit board check Fuse check Check the fuse on outdoor controller circuit board. Yes (blow) Did the fuse (F1 and F2) blow? Check the indoor controller board wiring.
10-6-3. Check method of power circuit board PUZ-A24NHA7 PUZ-A24NHA7-BS PUZ-A30NHA7 PUY-A24NHA7 PUY-A30NHA7 PUZ-A30NHA7-BS PUY-A24NHA7-BS PUY-A30NHA7-BS Note: To check the voltage of the parts on this board with a tester is difficult due to its location. Test points are limited. Power board check Is the voltage of main incoming power 198–253 V AC? Yes Is the voltage of CNDC(PNK) on outdoor controller circuit board 280–380 V DC? No No • Check the breaker and power supply.
10-6-4. Check method of power circuit board PUZ-A36NKA7 PUZ-A36NKA7-BS PUZ-A42NKA7 PUZ-A42NKA7-BS PUY-A36NKA7 PUY-A36NKA7-BS PUY-A42NKA7 PUY-A42NKA7-BS Note: To check the voltage of the parts on this board with a tester is difficult due to its location. Test points are limited. Power board check Is the voltage of main incoming power 198–253 V AC? Yes Is the voltage of CNDC(PNK) on outdoor controller circuit board 280–380 V DC? No No • Check the breaker and power supply.
10-6-5. Check method of DC fan motor (fan motor/outdoor controller circuit board) 1 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. (It causes trouble of the outdoor multi controller circuit board and fan motor.) 2 Self check Symptom: The outdoor fan cannot rotate. Fuse check Check the fuse (F5) on outdoor controller circuit board.
10-7. HOW TO CHECK THE COMPONENTS Low temperature thermistors 50 • Thermistor (TH3) • Thermistor <2-phase pipe> (TH6) • Thermistor (TH7) • Thermistor (TH32) Thermistor R0 = 15 k" ± 3% B constant = 3480 ± 2% Resistance (k") 40 1 1 t (°C): Rt =15exp{3480( 273+t – 273 )} 1 1 T (°F): RT =15exp{3480( 273+(T– 32)/1.8 – 273 )} 32°F 50°F 68°F 77°F [0°C] [10°C] [20°C] [25°C] 15 9.6 6.3 5.2 k" k" k" k" 86°F [30°C] 104°F [40°C] 30 20 10 4.3 k" 3.
Linear expansion valve (A12, 18, 24, 30) (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.
Linear expansion valve (A36, 42) (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.
(3) How to attach and detach the coil of linear expansion valve (A12, 18, 24, 30) Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Main body Coil Lead wire Stopper Hold the lower part of the main body (shown as A) firmly so that the main body does not move and detach the coil by pulling it upward. Be sure to detach the coil holding main body firmly. Otherwise pipes can bend due to stress.
(4) How to attach and detach the coil of linear expansion valve (A36, 42) Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Stopper Main body Coil Lead wire Hold the lower part of the main body (shown as A) firmly so that the main body does not move and detach the coil by pulling it upward. Be sure to detach the coil holding main body firmly. Otherwise pipes can bend due to stress.
10-8. EMERGENCY OPERATION (1) When the check codes shown below are displayed on outdoor unit or microprocessor 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) to ON and short-circuiting the connector (CN31) on outdoor controller board. When following abnormalities occur, emergency operation will be available.
(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) 81°F [27°C] 69°F [20.
10-9. TEST POINT DIAGRAM Outdoor controller circuit board PUZ-A12NKA7 PUZ-A18NKA7 PUY-A12NKA7 PUY-A18NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS PUY-A12NKA7-BS PUY-A18NKA7-BS Note: PUZ-A12//18NKA checks solder side. Brief Check of POWER MODULE If they are short-circuited, it means that they are broken. Measure the resistance in the following points (connectors, etc.). 1. Check of Diode (DS1, DS2) P - L1, P - N1, N - L1, N - N1 2. Check of Q1 P -N 3.
Switch board PUZ-A12NKA7 PUZ-A18NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS PUY-A12NKA7 PUY-A12NKA7-BS PUY-A18NKA7 PUY-A18NKA7-BS CN31 Emergency operation SWP Pump down SW7 Demand/silent mode setting SW6 Model select CNM A-control service kit SW4 Test operation SW5 Power failure automatic recovery/ compressor frequency setting SW1 manual defrost, delete "error history" and refrigerant address setting CNSW Connect to outdoor controller board OCH636B 66
Outdoor controller circuit board PUZ-A24NHA7 PUZ-A24NHA7-BS PUY-A24NHA7 PUY-A24NHA7-BS SW7 Demand control setting Model select PUZ-A30NHA7 PUZ-A36NKA7 PUZ-A30NHA7-BS PUZ-A36NKA7-BS PUY-A30NHA7 PUY-A36NKA7 PUY-A30NHA7-BS PUY-A36NKA7-BS SW1 Manual defrost, detect history record reset, refrigerant address PUZ-A42NKA7 PUZ-A42NKA7-BS PUY-A42NKA7 PUY-A42NKA7-BS CNDM CN3S Water heater 1 to 2: Input of low-level sound priority mode 1 to 3: Input of external contact point CN51 Water heater Co
Outdoor power circuit board PUZ-A24NHA7 PUZ-A30NHA7 PUZ-A24NHA7-BS PUZ-A30NHA7-BS PUY-A24NHA7 PUY-A30NHA7 PUY-A24NHA7-BS PUY-A30NHA7-BS Brief Check of POWER MODULE If they are short-circuited, it means that they are broken. Measure the resistance in the following points (connectors, etc.). 1.
Outdoor power circuit board PUZ-A36NKA7 PUZ-A42NKA7 PUZ-A36NKA7-BS PUZ-A42NKA7-BS PUY-A36NKA7 PUY-A42NKA7 PUY-A36NKA7-BS PUY-A42NKA7-BS Brief Check of POWER MODULE If they are short-circuited, it means that they are broken. Measure the resistance in the following points (connectors, etc.). 1.
10-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS (1) Function of switches The black square (■) indicates a switch position. Type of Switch No. switch Action by the switch operation Function 1 Manual defrost *1 2 Abnormal history clear OFF Start Normal When compressor is operating in heating operation.
Type of Switch No. Switch SW5 SW7 *4 SW9 Action by the switch operation ON OFF — — Function Effective timing 1 No function 2 Power failure automatic recovery *2 — Auto recovery No auto recovery When power supply ON 3,4,6 1 2 3 4 5 6 1 2 3,4 No function Mode select *3 No function Max Hz setting (cooling) Max Hz setting (heating) No function Defrost setting No function Function switch No function — Demand function — Max Hz (cooling) o 0.8 Max Hz (heating) o 0.
(3) Special function Low-level noise priority mode / Demand control function (Field wiring) The low-level noise priority mode and the demand control function are available by connection of a commercially available timer or ON-OFF contactor to the CNDM connector (an optional demand control input). • In the low-level noise priority mode, the outdoor unit operation noise decreases by approx.
The blinking patterns of both LED1 (green) and LED2 (red) indicate the types of abnormality when it occurs. Types of abnormality can be indicated in details by connecting an optional part ‘A-Control Service Tool (PAC-SK52ST)’ to connector CNM on outdoor controller board.
Indication Error Outdoor controller board Contents LED (Green) LED2 (Red) 2 blinking 5 blinking Serial communication error Communication error of M-NET system 3 blinking 1 blinking Abnormality of shell thermistor (TH32) and discharging temperature (TH4) 2 blinking Abnormal high pressure (High pressure switch 63H operated.
[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 The black square (■) indicates a switch position.
The black square (■) indicates a switch position. SW2 setting Display detail Pipe temperature/Liquid (TH3) −58 to 194 ON 1 2 3 4 5 6 Discharge temperature (TH4) −4 to 422 ON 1 2 3 4 5 6 ON Explanation for display Unit −58 to194 [−50 to 90˚C] (When the coil thermistor detects 0˚F or below, “–” and temperature are displayed by turns.) (Example) When −10˚F; 0.5 s 0.
SW2 setting ON 1 2 3 4 5 6 The black square (■) indicates a switch position. Display detail Explanation for display Operation mode on error occurring Operation mode of when operation stops due to error is displayed by setting SW2 as below. (SW2) ON Unit Code display 1 2 3 4 5 6 ON Pipe temperature/Liquid (TH3) on error occurring −58 to 194 −58 to 194 [−50 to 90˚C] (When the coil thermistor detects 0˚F or below, “–” and temperature are displayed by turns.) (Example) When −15˚F; 0.5 s 0.
The black square (■) indicates a switch position. SW2 setting ON Display detail Explanation for display The number of connected indoor units 0 to 3 (The number of connected indoor units are displayed.
The black square (■) indicates a switch position. SW2 setting ON Display detail Indoor setting temperature 62 to 86 Explanation for display Unit 62 to 86 [17 to 30˚C] ˚F [˚C] 1 2 3 4 5 6 ON 1 2 3 4 5 6 ON 1 2 3 4 5 6 ON Outdoor pipe temperature/2-phase −58 to 194 [−50 to 90˚C] pipe (TH6) (When the temperature is 0˚F or less, “–” and −58 to 194 temperature are displayed by turns.
The black square (■) indicates a switch position. SW2 setting Display detail DC bus voltage 180 to 500 ON Explanation for display 180 to 500 (When it is 100V or more, hundreds digit, tens digit and ones digit are displayed by turns.) Unit V 1 2 3 4 5 6 ON 1 2 3 4 5 6 ON Capacity save 0 to 100 When air conditioner is connected to M-NET and capacity save mode is demanded, a value from “0” to ”100” is displayed. When there is no setting of capacity save, “100” is displayed.
The black square (■) indicates a switch position. SW2 setting ON Display detail LEV-A opening pulse on error occurring 0 to 480 1 2 3 4 5 6 ON Explanation for display 0 to 480 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 130 pulse; 0.5 s 0.
SW2 setting Display detail Discharge superheat on error occurring SHd 32 to 360 ON 1 2 3 4 5 6 Cooling = TH4−TH6 Heating = TH4−TH5 Sub cool on error occurring.
SW2 setting Display detail Controlling status of compressor operating frequency Explanation for display Unit The following code will be a help to know the operating status of unit. •The tens digit Display Compressor operating frequency control 1 Primary current control 2 Secondary current control •The ones digit (In this digit, the total number of ON 1 2 3 4 5 6 ON 1 2 3 4 5 6 OCH636B activated control is displayed.
11 EASY MAINTENANCE FUNCTION 11-1. SMOOTH MAINTENANCE 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. 1 Select "Service" from the Main menu, and press the [SELECT] button. Select "Check" with the F1 or F2 button, and press the [SELECT] button.
11-2.GUIDE FOR OPERATION CONDITION Checkpoints Enter the temperature differences between 5 , 4 , 7 and 8 into the graph given below. Operation state is determined according to the plotted areas on the graph. For data measurements, set the fan speed to "Hi" before activating maintenance mode.
12 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. (1) Functions available when setting the unit number to 00 (Select 00 referring to 4 setting the indoor unit number.)
Function selections Function Mode No. Settings : Initial setting Wired remote controller Setting No.12-1-1. Selecting functions using the wired remote controller Maintenance password is required elect "Service" from the Main menu, and press the [SELECT] button. 1S Main Main menu *At the main display, the menu button and select "Service" to make the maintenance setting. Service 2 When the Service menu is selected, a window will appear asking for the password.
1 Select "Service" from the Main menu, and press the [SELECT] button. Settings menu Function setting Select "Setting" from the Service menu, and press the [SELECT] button. Service menu: MENU Select "Function setting", and press the [SELECT] button. F1 F2 F3 F4 ON OFF MENU RETURN SELECT HOLD 2 Set the indoor unit refrigerant addresses and unit numbers with the F1 through F4 buttons, and then press the [SELECT] button to confirm the current setting.
12-1-2. Selecting functions using the IR wireless remote controller (Type C) Functions can be selected with the IR wireless remote controller. Function selection using IR wireless remote controller is available only for refrigerant system with wireless function. Refrigerant address cannot be specified by the IR wireless remote controller. [Flow of function selection procedure] 1 Check the function selection setting.
12-3. Function selection of IR wireless remote controller TEMPERATURE DISPLAY °C/°F SETTING (Change of temp mode from °F to °C) 1 Press the set button with something sharp at the end. MODEL SELECT 2 Press the 3 Press the AUTO START blinks. button. “°F” blinks. button. “°C” blinks. 4 Press the set button with something sharp at the end. MODEL SELECT is lighted for 3 seconds, then turned off.
13 MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER 13-1. HOW TO "MONITOR THE OPERATION DATA" 13-1-1. PAR-4xMAA ("x" represents 0 or later) Details on the operation data including each thermistor temperature and error history can be confirmed with the remote controller. Check menu Error history Diagnosis Smooth maintenance Request code 1 Select "Service" from the Main menu, and press the [SELECT] button. Select "Check" with the F1 or F2 button, and press the [SELECT] button.
13-2. REQUEST CODE LIST Request code Certain indoor/outdoor combinations do not have the request code function; therefore, no request codes are displayed. Description Request content (Display range) Unit 0 Operation state Refer to 13-2-1. Detail Contents in Request Code.
Request code Description Request content Unit (Display range) 50 Indoor unit-Control state Refer to 13-2-1.Detail Contents in Request Code. – 51 Outdoor unit-Control state Refer to 13-2-1.Detail Contents in Request Code. – 52 Compressor-Frequency control state Refer to 13-2-1.Detail Contents in Request Code. – 53 Outdoor unit-Fan control state Refer to 13-2-1.Detail Contents in Request Code. – 54 Actuator output state Refer to 13-2-1.Detail Contents in Request Code.
Request code Description Request content (Display range) Unit 103 Error history 1 (latest) Displays error history. (" - - " is displayed if no history is present.) Code 104 Error history 2 (second to last) Displays error history. (" - - " is displayed if no history is present.) Code 105 Error history 3 (third to last) Displays error history. (" - - " is displayed if no history is present.
Request code Description Request content Unit (Display range) Remarks 153 154 155 Indoor-Fan operating time (After filter is reset) Indoor-Total operating time (Fan motor ON time) 0–9999 1 hour 0–9999 10 hours 156 0–255 Fan control data – For indoor fan phase control "00 **" "**" indicates fan control data. – For indoor fan pulsation control "00 **" "**" indicates fan control data.
13-2-1. Detail Contents in Request Code Example) Request code "004" Discharge temperature 156°F Refrigerant address "00" Request code Ref.
[Fan control state] (Request code : "53") Data display Display - (minus) 0 1 2 0 0 Correction value –1 0 +1 +2 Fan step correction value by heatsink temperature overheat prevention control Fan step correction value by cool condensation temperature overheat prevention control [Actuator output state] (Request code : "54")
[Contact demand capacity] (Request code : "61") Data display 0 0 0 Setting content Setting content Display Setting value 0 1 2 3 0% 50% 75% 100% Setting SW7-1 SW7-2 ON ON ON ON Silent mode input Spare 1 input [External input state] (Request code : "62") Data display 0 0 0 Input state Input state Display Contact demand input 0 1 2 3 4 5 6 7 8 9 A b C d E F [Outdoor unit – Capacity setting display] (Request code : "70")
[Indoor unit – Capacity setting information] (Request code : 163) Data display 0 Display 0 See the table on the right. Capacity setting state 00 01 02 03 04 05 06 07 08 09 0A 0b 0C 0d 0E 0F 12 18 24 30 36 [Wireless pair No. (indoor control board side) setting] (Request code : 165) Data display 0 Display 0 See the table on the right. OCH636B 00 01 02 03 99 Pair No. setting state No. No. No. No.
14 DISASSEMBLY PROCEDURE PUZ-A12NKA7 PUZ-A18NKA7 PUZ-A12NKA7-BS PUZ-A18NKA7-BS PUY-A12NKA7 PUY-A12NKA7-BS : Indicates the visible parts in the photos/figures. OPERATING PROCEDURE 1. Removing the top panel, service panel, front panel, back panel, and grille (1) Remove the top panel fixing screws (4 × 10), one from the right and two from the left side, and detach the top panel. (2) Remove 2 service panel fixing screws (4 × 10) and detach the service panel by pulling it downward.
OPERATING PROCEDURE 3. Removing the electrical parts box (1) Remove the service panel. (See Photo 2) (2) Remove the top panel. (See Photo 1) (3) Remove the front panel. (See Photo 1) (4) Remove the back panel. (See Photo 1) (5) Disconnect the indoor/outdoor connecting wire from terminal block. (6) D isconnect the connector CNF1, LEV-A and LEV-B on the controller circuit board. • CNF1 : Fan motor • LEV-A, LEV-B : LEV (7) Disconnect the pipe-side connections of the following parts.
OPERATING PROCEDURE 5. Removing the thermistor (TH7) (1) Remove the service panel. (See Photo 2) (2) Remove the top panel. (See Photo 1) (3) D isconnect the connector TH7 (red) on the controller circuit board in the electrical parts box. (4) Loosen the clamp for the lead wire in the rear of the electrical parts box. (See Photo 6) (5) Pull out the thermistor (TH7) from the sensor holder.
OPERATING PROCEDURE PHOTOS/FIGURES 8. Removing the 4-way valve Photo 10-1: PUZ model (1) Remove the service panel. (See Photo 2) (2) Remove the top panel. (See Photo 1) (3) Remove the front panel. (See Photo 1) (4) Remove the back panel. (See Photo 1) (5) Remove the electrical parts box. (See Photo 5) (6) Remove the 4-way valve (See Photo 9) LEV coil (7) Recover refrigerant. (LEV B) (8) Remove the welded part of 4-way valve. Note 1: Recover refrigerant without spreading it in the LEV B air.
OPERATING PROCEDURE 12. Removing the compressor (MC) Photo 12 (1) Remove the service panel. (See Photo 2) (2) Remove the top panel. (See Photo 1) (3) Remove the front panel. (See Photo 1) Compressor (4) Remove the back panel. (See Photo 1) shell felt (5) Remove the electrical parts box. (See Photo 5) (6) Remove the thermistor (TH4) and thermistor (TH32). (See Photo 8) (7) Remove 3 separator fixing screws (4 × 10) and remove Compressor (MC) the separator.
PUZ-A24NHA7 PUZ-A30NHA7 PUZ-A24NHA7-BS PUZ-A30NHA7-BS PUY-A24NHA7 PUY-A24NHA7-BS PUY-A30NHA7 PUY-A30NHA7-BS PHOTO: PUZ-A24NHA7 PHOTOS/FIGURES OPERATING PROCEDURE 1. Removing the service panel and top panel Photo 1 (1) Remove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service panel. (2) R emove screws (3 for front, 3 for rear/5 × 12) of the top panel and remove it.
OPERATING PROCEDURE 4. Removing the thermistor (TH3) and thermistor Photo 5 <2-phase pipe> (TH6) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) Controller (3) Disconnect the connector TH7/6 (red) and TH3 (white) circuit board on the controller circuit board in the electrical parts box. (C.B.) (4) Loosen the 2 clamps for the lead wires on the top of the electrical parts box.
OPERATING PROCEDURE 8. Removing the 4-way valve coil (21S4), LEV coil (LEV(A), Photo 8 LEV(B)) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 4) [Removing the 4-way valve coil] (4) Remove 4-way valve coil fixing screw (M4 × 6). (5) Remove the 4-way valve coil by sliding the coil toward you. (6) Disconnect the connector 21S4 (green) on the controller board in the electrical parts box.
OPERATING PROCEDURE PHOTOS/FIGURES 11. Removing the high pressure switch (63H) Photo 9 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 4) (4) Remove 3 right side panel fixing screws (5 × 12) in the rear of the unit and remove the right side panel. (5) Pull out the lead wire of high pressure switch. Lead wire of (6) Recover refrigerant. high pressure switch (7) Remove the welded part of high pressure switch.
OPERATING PROCEDURE 13. Removing the compressor (MC) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) R emove 2 front cover panel fixing screws (5 × 12) and remove the front cover panel. (See Photo 1) (4) R emove 2 back cover panel fixing screws (5 × 12) and remove the back cover panel. (5) Remove the electrical parts box.
PUZ-A36NKA7 PUZ-A42NKA7 PUZ-A36NKA7-BS PUZ-A42NKA7-BS PUY-A36NKA7 PUY-A36NKA7-BS OPERATING PROCEDURE 1. Removing the service panel, top panel, ice guard, and Photo 1 propeller (1) Remove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service panel. (See Photo 1) (2) Remove screws (3 for front, 3 for rear/5 × 12) of the top Grille fixing screws panel and remove it. (See Photo 1) (3) Remove 4 grille fixing screws (5 × 12) from each grille and remove it.
OPERATING PROCEDURE 4. Removing the thermistor <2-phase pipe> (TH6) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) D isconnect the connectors, TH6 and TH7 (red), on the controller circuit board in the electrical parts box. (4) L oosen the clamp for the lead wire in the rear of the electrical parts box. (5) P ull out the thermistor <2-phase pipe> (TH6) from the sensor holder.
OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the 4-way valve coil (21S4) and linear expan- Photo 8-1: PUZ model sion valve coil (LEV-A, B) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) [Removing the 4-way valve coil] (3) Remove 4-way valve coil fixing screw (M4 × 6). (4) Remove the 4-way valve coil by sliding the coil toward you. (5) Disconnect the connector 21S4 (green) on the controller circuit board in the electrical parts box.
OPERATING PROCEDURE 10. Removing the high pressure switch (63H) (1) Remove the service panel. (See photo 1) (2) Remove the top panel. (See photo 1) (3) Remove 3 right side panel fixing screws (5 × 12) in the rear of the unit and remove the right side panel. (4) Pull out the lead wire of high pressure switch. (5) Recover refrigerant. (6) Remove the welded part of high pressure switch. Note 1: Recover refrigerant without spreading it in the air.
OPERATING PROCEDURE 12. Removing the compressor (MC) Photo 11 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove 1 front cover panel fixing screws (5 × 12) and remove the front cover panel. (See Photo 4) (4) Remove 4 back cover panel fixing screws (5 × 12) and remove the back cover panel. (5) Remove the electrical parts box.
OCH636B 115
HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2016 MITSUBISHI ELECTRIC CORPORATION Issued: Sep. 2019 No. OCH636 REVISED EDITION-B Issued: Feb. 2017 No. OCH636 REVISED EDITION-A Published: Oct. 2016 No. OCH636 Made in Japan Specifications are subject to change without notice.
