Service manual

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SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

SPLIT-TYPE, AIR CONDITIONERS

CONTENTS

1. REFERENCE MANUAL··································2

2. SAFETY PRECAUTION··································3

3. FEATURES ·····················································6

4. SPECIFICATIONS···········································7

5. DATA ·······························································9

6. OUTLINES AND DIMENSIONS····················13

7. WIRING DIAGRAM·······································16

8. WIRING SPECIFICATIONS ··························20

REFRIGERANT SYSTEM DIAGRAM

·············25

10. TROUBLESHOOTING ··································28

11. EASY MAINTENANCE FUNCTION ··············85

12. FUNCTION SETTING····································88

13.

MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER

············96

14. DISASSEMBLY PROCEDURE ···················106

No.OCH429

R410A

November 2007

[model names]

PUZ-A18NHA2

PUZ-A24NHA2

PUZ-A30NHA2

PUZ-A36NHA2

PUZ-A42NHA2

PUZ-A18NHA2-BS

PUZ-A24NHA2-BS

PUZ-A30NHA2-BS

PUZ-A36NHA2-BS

PUZ-A42NHA2-BS

PUY-A12NHA2

PUY-A18NHA2

PUY-A24NHA2

PUY-A30NHA2

PUY-A36NHA2

PUY-A42NHA2

PUY-A12NHA2-BS

PUY-A18NHA2-BS

PUY-A24NHA2-BS

PUY-A30NHA2-BS

PUY-A36NHA2-BS

PUY-A42NHA2-BS

[Service Ref.]

PUZ-A18NHA2

PUZ-A24NHA2

PUZ-A30NHA2

PUZ-A36NHA2

PUZ-A42NHA2

PUZ-A18NHA2-BS

PUZ-A24NHA2-BS

PUZ-A30NHA2-BS

PUZ-A36NHA2-BS

PUZ-A42NHA2-BS

PUY-A12NHA2

PUY-A18NHA2

PUY-A24NHA2

PUY-A30NHA2

PUY-A36NHA2

PUY-A42NHA2

PUY-A12NHA2-BS

PUY-A18NHA2-BS

PUY-A24NHA2-BS

PUY-A30NHA2-BS

PUY-A36NHA2-BS

PUY-A42NHA2-BS

NOTE:

• This manual describes only

service data of the outdoor

units.

• RoHS compliant products

have <G> mark on the spec

name plate.

• For servicing RoHS compliant

products, refer to the RoHS

PARTS LIST.

PUZ-A24/30/36NHA2

PUY-A24/30/36NHA2

Outdoor unit

PARTS CATALOG (OCB429)

OCH429--1.qxp 07.11.20 9:17 AM Page 1

Summary of content (120 pages)

PAGE 1
OCH429--1.qxp 07.11.20 9:17 AM Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS Outdoor unit November 2007 No.OCH429 SERVICE MANUAL R410A [model names] [Service Ref.
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OCH429--1.qxp 1 07.11.20 9:17 AM Page 2 REFERENCE MANUAL 1-1. INDOOR UNIT Model name Service Ref. PLA-A12/18/24/30/36/42BA PLA-A12/18/24/30/36/42BA1 PCA-A24/30/36/42GA PCA-A24/30/36/42GA2 PKA-A12/18GA PKA-A12/18GAL PKA-A12/18GA2 PKA-A12/18GAL2 PKA-A24/30/36FA PKA-A24/30/36FAL PKA-A24/30/36FA2 PKA-A24/30/36FAL2 1-2. TECHNICAL DATA BOOK Manual No. OCS13 2 Service Manual No.
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OCH429--1.qxp 2 07.11.20 9:17 AM Page 3 SAFETY PRECAUTION 2-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminals, all supply circuits must be disconnected. 2-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Use new refrigerant pipes. Do not use refrigerant other than R410A. In case of using the existing pipes for R22, be careful with the followings. · Be sure to clean the pipes and make sure that the insides of the pipes are clean.
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OCH429--1.qxp 07.11.20 9:17 AM 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) When performing service, install a filter drier simultaneously. Be sure to use a filter drier for new refrigerant.
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OCH429--1.qxp 07.11.20 9:17 AM Page 5 2-3. 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 time higher than that of R22, their sizes of flared sections and flare nuts are different.
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OCH429--1.qxp 3 07.11.20 9:17 AM Page 6 FEATURES PUZ-A18NHA2 PUZ-A18NHA2-BS PUY-A12/18NHA2 PUY-A12/18NHA2-BS PUZ-A24/30/36NHA2 PUZ-A24/30/36NHA2-BS PUY-A24/30/36NHA2 PUY-A24/30/36NHA2-BS PUZ-A42NHA2 PUZ-A42NHA2-BS PUY-A42NHA2 PUY-A42NHA2-BS CHARGELESS SYSTEM PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT. (Max. 100ft, 30m (A42) / Max.
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OCH429--1.qxp 07.11.20 9:17 AM 4 Page 7 SPECIFICATIONS Service Ref. Power supply Phase Cycle 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) o No. Fan motor output Fan motor Airflow Sound level Cooling Heating Protection devices Dimension A A A PUZ-A18NHA2 PUZ-A18NHA2-BS PUZ-A24NHA2 PUZ-A24NHA2-BS 13 20 15 18 30 25 SNB130FPBM1 0.85 12 14 TNB220FLDM 1.
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OCH429--1.qxp 07.11.20 9:17 AM Service Ref. PUY-A12NHA2 PUY-A18NHA2 PUY-A24NHA2 PUY-A30NHA2 PUY-A36NHA2 PUY-A42NHA2 PUY-A12NHA2-BS PUY-A18NHA2-BS PUY-A24NHA2-BS PUY-A30NHA2-BS PUY-A36NHA2-BS PUY-A42NHA2-BS Power supply Phase Cycle 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) o No.
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OCH429--1.qxp 07.11.20 9:17 AM 5 Page 9 DATA 5-1. REFILLING REFRIGERANT CHARGE (R410A : oz, kg) Service Ref.
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OCH429--1.qxp 07.11.20 9:17 AM Page 10 5-3. NOISE CRITERION CURVES PUY-A12/18NHA2 PUY-A12/18NHA2-BS PUZ-A18NHA2 PUZ-A18NHA2-BS MODE SPL(dB) COOLING 46 HEATING 47 LINE PUY-A24/30/36NHA2 PUY-A24/30/36NHA2-BS PUZ-A24/30/36NHA2 PUZ-A24/30/36NHA2-BS 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 10 LINE 90 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE 63 125 NC-20 250 500 1000 2000 4000 8000 OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.
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OCH429--1.qxp 07.11.20 9:17 AM Page 11 5-4. STANDARD OPERATION DATA 5-4-1.
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OCH429--1.qxp 07.11.20 9:17 AM Page 12 5-4-2.
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OCH429--1.qxp 07.11.20 9:17 AM Page 13 OUTLINES AND DIMENSIONS 6 OUTDOOR UNIT PUZ-A18NHA2 PUZ-A18NHA2-BS PUY-A12/18NHA2 PUY-A12/18NHA2-BS Unit : mm 43.6<1-23/32> 400<15-25/32> 347.5<13-11/16> [33<1-5/16> drain hole 330<13> Air intake 365<14-3/8> 152<6> 300<11-13/16> 155 Air intake 32.5<1-9/32> 45.4<1-25/32> Air outlet 4-oval hole 40<1-9/16> 18<23/32> Service panel 23<29/32> 22<7/8> Service panel for charge plug 2-ø22.
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Example of Notes Min. 100mm <3-15/16> Min. 10mm <3/8> Service space Min. 10mm <3/8> Min. 500mm <19-11/16> Dimensions of space needed for service access are shown in the below diagram.
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Min. 150mm <5-29/32> Min. 10mm <3/8> Service space Min. 10mm<3/8> Front piping hole (Knockout) Front trunking hole (Knockout) 92<3-5/8> 65<2-9/16> [92 /8> <3-5 40<1-9/16> Conduit hole (2-[27<1-1/16>Knockout) 45<1-25/32> 19<3/4> 75 <2-31/32> Right piping hole (Knockout) Piping Knockout Hole Details [92 <3-5/8> 40<1-9/16> Max. 30mm<1-3/16> Right trunking hole (Knockout) 45<1-25/32> Conduit hole (2-[27<1-1/16>Knockout) 55<2-3/16> 92<3-5/8> Air intake Handle Min.
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OCH429--1.qxp 07.11.20 9:17 AM Page 20 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.
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OCH429--1.qxp 07.11.20 9:17 AM Page 21 8-2. 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 A B C D E F G H * The optional indoor power supply terminal kit is required.
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OCH429--1.qxp 07.11.20 10:01 AM Page 22 8-3. INDOOR - OUTDOOR CONNECTING CABLE Wire No. o Size Outdoor power supply Max. 45m, 147ft Indoor unit-Outdoor unit Max. 50m, 164ft 3 o AWG15(polar) 3 o AWG13(polar) Max. 80m, 262ft 3 o AWG13(polar) and S3 separated w The max. cable length may vary depending on the condition of installation, humidity or materials, etc. Wire No. o Size Indoor/Outdoor separate power supply Max. 120m, 393ft Indoor unit-Outdoor unit 2 o Min.
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OCH429--1.qxp 07.11.20 9:17 AM Page 23 8-4. M-NET WIRING METHOD (Points to notice) (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 5cm. Do not put them in the same conduit tube. (2) Terminal block (TB7) for transmission wires should never be connected to 208/230V power supply. If it is connected, electronic parts on M-NET P.C.
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OCH429--1.qxp 07.11.20 9:17 AM Page 24 ● M-NET wiring 2 M-NET (1) Use 2-core x 1.25mm [AWG16] shield wire for electric wires. terminal Ground (Excluding the case connecting to system controller.) block wire (2) Connect the wire to the M-NET terminal block. Connect one core of the transmission wire (non-polar) to A terminal and the other to B. Peel the A B S shield wire, twist the shield part to a string and connect it to S terminal.
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OCH429--1.qxp 9 07.11.20 9:17 AM Page 25 REFRIGERANT SYSTEM DIAGRAM PUZ-A18NHA2 PUZ-A18NHA2-BS Unit : mm(inch) Service port(check) High pressure protect switch Stop valve (with service port) 4-way valve (#50) Strainer Refrigerant GAS pipe 12.7A({1/2) Outdoor heat exchanger Thermistor (TH6) Thermistor (TH3) Muffler Distributor Thermistor(TH4) Accumulator Compressor (#100) Strainer Refrigerant LIQUID pipe 6.
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OCH429--1.qxp 07.11.20 9:17 AM Page 26 PUY-A12/18NHA2 PUY-A12/18NHA2-BS Stop valve (with service port) (#50) Strainer Refrigerant GAS pipe 12.7A({1/2) Unit : mm(inch) Service port (Check) Outdoor heat exchanger High pressure protect switch Thermistor (TH6) Thermistor (TH3) Thermistor (TH4) Distributor Accumulator Compressor Refrigerant LIQUID pipe 6.
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OCH429--1.qxp 07.11.20 9:17 AM Page 27 1. Refrigerant recovering (pump down) Perform the following procedures to recover the refrigerant when moving the indoor unit or the outdoor unit. 1Turn on the power supply (circuit breaker). wWhen 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.
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OCH429--1.qxp 10 07.11.20 9:17 AM Page 28 TROUBLESHOOTING 10-1. TROUBLESHOOTING 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. Check the contents below before investigating details.
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OCH429--1.qxp 07.11.20 9:17 AM Page 29 "TEST RUN" and the currently selected operation mode are displayed altemately. Displays the remaining test run time. 59 Operating procedures 1. Turn on the main power supply. 2. Press A TEST button twice. The TEST RUN appears on the screen. 3. Press B OPERATION SWITCH button. Cooling mode: Check if cool air blows and water is drained. Heating mode: Check if warm air blows. (It takes a little while until warm air blows.) °F 4. Press C AIR DIRECTION button.
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OCH429--1.qxp 07.11.20 9:17 AM Page 30 Test run [for wireless remote controller] COOL TEST RUN TEMP ON/OFF 7 FAN AUTO STOP VANE AUTO START 5 MODE 3,4 6 CHECK LOUVER min TEST RUN 2 SET h RESET 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 1.0M". 1 Turn on the main power to the unit. TEST RUN 2 Press the button twice continuously.
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OCH429--2.qxp 07.11.20 9:18 AM Page 31 10-3. HOW TO PROCEED "SELF-DIAGNOSIS" 10-3-1. When a Problem Occurs During Operation 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. 1[CHECK] and the refrigerant address are displayed on the temperature display, and the error code and unit number are displayed alternately as shown below. (If the outdoor unit is malfunctioning, the unit number will be "00".
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OCH429--2.qxp 07.11.20 9:18 AM D Press the Page 32 ON/OFF button twice within 3 seconds. The self-diagnosis address or refrigerant address will blink. When the error history is reset, the display will look like the one shown below. However, if you fail to reset the error history, the error content will be displayed again. 5 Cancel self-diagnosis. Self-diagnosis can be cancelled by the following 2 methods. H Press the CHECK 5 Press the button twice within 3 seconds. ON/OFF button.
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OCH429--2.qxp 07.11.20 9:18 AM Page 33 10-3-4. Malfunction-diagnosis method by wireless remote controller When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop. [Procedure] 1. Press the CHECK button twice. • "CHECK" lights, and refrigerant address "00" blinks.
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OCH429--2.qxp 07.11.20 9:18 AM Page 34 • Refer to the following tables for details on the check codes. [Output pattern A] Beeper sounds OPERATION INDICATOR lamp blink pattern Beep Beep Beep Beep Off Beep 1st 2 nd 3 rd nth On On On On Beep Beep 1st Off On 2 nd · · · Repeated On 0.5 sec. Approx. 2.5 sec. 0.5 sec. 0.5 sec. Self-check Approx. 2.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.
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OCH429--2.qxp 07.11.20 9:18 AM Page 35 10-4. SELF-DIAGNOSIS ACTION TABLE (Note 1) Refer to indoor unit section for code P and code E. Error Code Abnormal point and detection method Case Judgment and action 1 No voltage is supplied to terminal 1 Check following items. block(TB1) of outdoor unit. a) Power supply breaker a) Power supply breaker is b) Connection of power supply terminal block turned off.
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OCH429--2.qxp Error Code F5 (5201) F9 (4119) EA (6844) Eb (6845) EC (6846) 07.11.20 9:18 AM Page 36 Abnormal point and detection method Case Judgment and action 63H connector open 1 Disconnection or contact failure Abnormal if 63H connector circuit is open of 63H connector on outdoor for 3 minutes continuously after power supcontroller circuit board ply. 2 Disconnection or contact failure 63H: High-pressure switch of 63H 3 63H is working due to defective parts.
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OCH429--2.qxp 07.11.20 9:18 AM Page 37 Error Code Abnormal point and detection method High pressure (High-pressure switch 63H worked) Abnormal if high-pressure switch 63H worked ( w ) during compressor operation. w 4.15 MPa [602PSIG] 63H: High-pressure switch U1 (1302) High discharging temperature (1) Abnormal if discharge temperature thermistor (TH4) exceeds 125:[257˚F] or 110: [230˚F] continuously for 5 minutes.
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OCH429--2.qxp Error Code U3 (5104) U4 (TH3:5105) (TH6:5107) (TH7:5106) (TH8:5110) 07.11.20 9:18 AM Page 38 Abnormal point and detection method 1 Disconnection or contact failure of connector (TH4) on the outdoor controller circuit board 2 Defective thermistor 3 Defective outdoor controller circuit board Open/short of outdoor unit thermistors (TH3, TH6, TH7, and TH8) Abnormal if open or short is detected during compressor operation.
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OCH429--2.qxp 07.11.20 9:18 AM Error Code U8 (4400) Page 39 Abnormal point and detection method Outdoor fan motor 1 Failure in the operation of The outdoor fan motor is considered to be the DC fan motor abnormal if the rotational frequency of fan 2 Failure in the outdoor circuit motor is abnormal when detected during controller board operation.
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OCH429--2.qxp Error Code 07.11.20 9:18 AM Page 40 Abnormal point and detection method Low pressure (63L worked) Abnormal if 63L is worked (under0.03MPa) during compressor operation. 63L: Low-pressure switch UL (1300) UP (4210) E0 or E4 E1 or E2 (A42N only) Case 1 Stop valve of outdoor unit is closed during operation.
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OCH429--2.qxp 07.11.20 9:18 AM Error Code E3 or E5 E8 (6840) E9 (6841) EF (6607 or 6608) Page 41 Abnormal point and detection method Remote controller transmission error(E3)/signal receiving error(E5) 1 Abnormal if remote controller could not find blank of transmission path for 6 seconds and could not transmit. (Error code: E3) 2 Remote controller receives transmitted data at the same time, compares the data, and when detecting it, judges different data to be abnormal 30 continuous times.
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OCH429--2.qxp Error Code P8 07.11.20 9:18 AM Page 42 Abnormal point and detection method Pipe temperature 1 Slight temperature difference between indoor room Detected as abnormal when the pipe temtemperature and pipe utes after compressor start and 6 minutes temperature thermistor after the liquid or condenser/evaporator pipe • Shortage of refrigerant is out of cooling range.
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OCH429--2.qxp 07.11.20 9:18 AM Page 43 Error Code Abnormal point and detection method Case Judgment and action A6 (6606) Communication error with communication processor Defective communication between unit processor and transmission processor Note) The address and attribute display at remote controller indicate the controller that detected abnormality. 1 Data of transmission processor or unit processor is not transmitted normally because of accidental trouble such as noise or thunder surge.
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OCH429--2.qxp 07.11.20 9:18 AM Page 44 From the previous page. Error Code A7 (6607) Case Judgment and action 4. If displayed address or attribute is remote controller, Indoor unit detects abnormality when indoor unit transmitted to remote controller and there was no reply (ACK).
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OCH429--2.qxp 07.11.20 9:18 AM Error Code A8 (6608) Page 45 Abnormal point and detection method Case M-NET NO RESPONSE 1 Transmitting condition is repeated fault because of Abnormal if a message was transmitted noise and the like. and there were reply (ACK) that message 2 Extension of transmission wire was received, but response command voltage and signal is caused does not return. Transmitting side detects by over-range transmission abnormality every 30 seconds, 6 times wire. continuously.
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OCH429--2.qxp 07.11.20 9:18 AM Phenomena 4. Even controlling by the wireless remote controller no beep is heard and the unit does not start operating. Operation display is indicated on wireless remote controller. Page 46 Factor Countermeasure 1The pair number settings of the wireless remote controller and indoor controller board are mismatched. 1Check the pair number settings. 5. When operating by the wireless remote controller, beep sound is heard, however, unit does not start operating.
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OCH429--2.qxp 07.11.20 9:18 AM Page 47 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 error codes displayed on the remote controller? Check the LED display of the outdoor controller circuit board.
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OCH429--2.qxp 07.11.20 9:18 AM Page 48 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. AC 187V to AC 253V? YES NO Check the voltage among L1 and L2 on the terminal block (TB1) of the outdoor power circuit board.
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OCH429--2.qxp 07.11.20 9:18 AM Page 49 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. NO AC 187V to AC 253V? YES Not lighting. Check the status of the indoor controller board LED3 display. Check the looseness or disconnection of the indoor/outdoor connecting wire.
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OCH429--2.qxp 07.11.20 9:18 AM Page 50 Symptoms: Nothing is displayed on the remote controller 3 Diagnosis flow Cause 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. DC 10V to DC 16V? YES • Defective remote controller • Replace the remote controller. NO Check the status of the LED2.
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OCH429--2.qxp 07.11.20 9:18 AM Page 51 • Before repair Frequent calling from customers Phone Calls From Customers How to Respond 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 while after it’s stopped. 2 Wait around 3 minutes to restart unit.
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OCH429--2.qxp 07.11.20 9:18 AM Page 52 Phone Calls From Customers How to Respond 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. Note 2 Check if filters are not dirty and clogged.
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OCH429--2.qxp 07.11.20 9:18 AM Page 53 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 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. Note However, this control is also applied to the models which has no electric heater.
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OCH429--2.qxp 07.11.20 9:18 AM Page 54 Phone Calls From Customers A white mist is expelled from the indoor unit. Water or moisture is expelled from the outdoor unit. How to Respond This is not a malfunction. This may occur when the operation gets started in the room of high humidity. Cooling; when pipes or piping joints are cooled, they get sweated and water drips down. Heating; water drips down from the heat exchanger.
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OCH429--2.qxp 07.11.20 9:18 AM Page 55 10-6. HOW TO CHECK THE PARTS PUZ-A18/24/30/36/42NHA2 PUZ-A18/24/30/36/42NHA2-BS PUY-A12/18/24/30/36/42NHA2 PUY-A12/18/24/30/36/42NHA2-BS Check points Parts name Thermistor (TH3) Disconnect the connector then measure the resistance with a tester.
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OCH429--2.qxp 07.11.20 9:18 AM Page 56 Check method of DC fan motor (fan motor / outdoor controller circuit board) 1 Notes · High voltage is applied to the connecter (CNF1, 2) for the fan motor. Give 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.) 2 Self check Symptom : The outdoor fan cannot turn around. Fuse check Check the fuse (F5) on outdoor controller board.
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OCH429--2.qxp 07.11.20 9:18 AM Page 57 10-7. HOW TO CHECK THE COMPONENTS 50 Low temperature thermistors • Thermistor (TH3) • Thermistor (TH6) • Thermistor (TH7) Resistance (k") 40 Thermistor R0 = 15k' ± 3% B constant = 3480 ± 2% 1 1 t (:): Rt =15exp{3480( 273+t – 273 )} 30 20 1 1 T (˚F): RT =15exp{3480( 273+(T– 32)/1.8 – 273 )} 10 0:[32˚F] 10:[50˚F] 20:[68˚F] 25:[77˚F] 15k' 9.6k' 6.3k' 5.2k' 30:[86˚F] 40:[104˚F] 4.3k' 3.
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OCH429--2.qxp 07.11.20 9:18 AM Page 58 Linear expansion valve (A12, 18) (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.
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OCH429--2.qxp 07.11.20 9:18 AM Page 59 Linear expansion valve (A24, 30, 36, 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.
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OCH429--2.qxp 07.11.20 9:18 AM Page 60 (3) How to attach and detach the coil of linear expansion valve (A12, 18) 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.
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OCH429--3.qxp 07.11.20 9:19 AM Page 61 (4) How to attach and detach the coil of linear expansion valve (A24, 30, 36, 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.
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OCH429--3.qxp 07.11.20 9:19 AM Page 62 10-8. 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) to ON and short-circuiting the connector (CN31) on outdoor controller board. ●When following abnormalities occur, emergency operation will be available.
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OCH429--3.qxp 07.11.20 9:19 AM Page 63 (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) 27:, 81˚F 20.
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OCH429--3.qxp 07.11.20 9:19 AM Page 64 10-9. TEST POINT DIAGRAM Outdoor controller circuit board PUZ-A18/24/30/36/42NHA2 PUZ-A18/24/30/36/42NHA2-BS PUY-A12/18/24/30/36/42NHA2 PUY-A12/18/24/30/36/42NHA2-BS SW7 SW1 Demand control setting Forced defrost, detect history record reset, refrigerant address TEST POINT1 is high voltage.
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OCH429--3.qxp 07.11.20 9:19 AM Page 65 Outdoor noise filter circuit board PUZ-A18NHA2 PUZ-A18NHA2-BS PUY-A12/18NHA2 PUY-A12/18NHA2-BS LI, NI Voltage of 208/230V AC is input. (Connect to the terminal block(TB1)) EI Connect to the earth E2 Connect to the earth E3 Connect to the earth CNAC1, CNAC2 208/230V AC (Connect to the outdoor controller circuit board (CNAC)) CN5 Primary current (Connect to the outdoor power circuit board (CN5)) LO, NO Voltage of 208/230V AC is output.
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OCH429--3.qxp 07.11.20 9:19 AM Page 66 Outdoor noise filter circuit board PUZ-A24NHA2 PUZ-A24NHA2-BS PUY-A24NHA2 PUY-A24NHA2-BS EI, E2 Connect to the earth E3 Connect to the earth CNAC1, CNAC2 208/230V AC (Connect to the outdoor controller circuit board (CNAC)) CN5 Primary current (Connect to the outdoor power circuit board (CN5)) CN52C 52C relay signal (Connect to the outdoor controller circuit board (CN52C)) LO, NO Voltage of 208/230V AC is output.
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OCH429--3.qxp 07.11.20 9:19 AM Page 68 Outdoor power circuit board PUZ-A18NHA2 PUZ-A18NHA2-BS PUY-A12/18NHA2 PUY-A12/18NHA2-BS Brief check of DIP-IPM and DIP-PFC W Usually, they are in a state of being short-circuited if they are broken. Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken. 1. Check of DIP-IPM P-U, P-V, P-W, N-U, N-V, N-W 2.
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OCH429--3.qxp 07.11.20 9:19 AM Page 69 Outdoor power circuit board PUZ-A30/36/42NHA2 PUZ-A30/36/42NHA2-BS PUY-A30/36/42NHA2 PUY-A30/36/42NHA2-BS Brief check of POWER MODULE W Usually, they are in a state of being short-circuited if they are broken. Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken. 1. Check of diode bridge TABP1-TABS, TABN1-TABS, TABP1-TABT,TABN1-TABT 2.
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OCH429--3.qxp 07.11.20 9:19 AM Page 71 10-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS (1) Function of switches Type of Switch No. switch Action by the switch operation Function 1 Forced defrost w1 2 Abnormal history clear Effective timing ON OFF Start Normal When compressor is working in heating operation.
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OCH429--3.qxp 07.11.20 9:19 AM Type of Switch No. Switch 1 SW5 Dip switch SW9 No function — Power failure automatic recovery w2 Auto recovery No auto recovery When power supply ON 3,4,5 No function — — — 6 Model select Following SW5-6 reference SW7-1 SW7-2 Power consumption (Demand switch ON) OFF OFF 0% (Operation stop) ON OFF 50% OFF ON 75% Setting of demand control w3 2 Always 3 Max. Hz setting(cooling) Max. Hz(cooling) o 0.8 Normal Always 4 Max.
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OCH429--3.qxp 07.11.20 9:19 AM Page 73 Special function (a) Low-level sound priority mode (Local wiring) Unit enters into Low-level sound priority mode by external signal input setting. Inputting external signals to the outdoor unit decreases the outdoor unit operation sound 3 to 4 dB lower than that of usual.
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OCH429--3.qxp 07.11.20 9:19 AM Page 74 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.
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OCH429--3.qxp 07.11.20 9:19 AM Indication Outdoor controller board LED1 (Green) LED2 (Red) Page 75 Error Contents Error code w1 3 blinking 1 blinking Abnormality of shell thermostat U2 and discharging temperature (TH4) Inspection method Detailed reference page 1Check if stop valves are open. 2Check if connectors (TH4, LEV-A) on outdoor controller board are not disconnected. 3Check if unit is filled with specified amount of refrigerant.
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OCH429--3.qxp 07.11.20 9:19 AM Page 76 [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 controlling DIP SW2 on ‘A-Control Service Tool’.
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OCH429--3.qxp 07.11.20 9:19 AM SW2 setting ON Page 77 Pipe temperature / Liquid(TH3) – 40~194 1 2 3 4 5 6 Discharge temperature (TH4) 37~327 ON 1 2 3 4 5 6 ON Explanation for display Unit – 40~194 (– 40~90:) (When the coil thermistor detects 0˚F or below, “–” and temperature are displayed by turns.) (Example) When -10˚F; 0.5 secs. 0.5secs. 2 secs. 10 ˚F 37~327 (3~164:) (When the discharge thermistor detects 100˚F or more, hundreds digit, tens digit and ones digit are displayed by turns.
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OCH429--3.qxp 07.11.20 9:19 AM SW2 setting ON Page 78 Display detail Explanation for display Unit Pipe temperature / Liquid(TH3) on error occurring – 40~194 – 40~194 (– 40~90:) (When the coil thermistor detects 0˚F or below, “–” and temperature are displayed by turns.) (Example) When –15˚F; 0.5 secs. 0.5secs. 2 secs.
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OCH429--3.qxp 07.11.20 9:19 AM SW2 setting Page 79 Explanation for display Display detail The number of connected indoor units ON 0~3 (The number of connected indoor units are displayed.
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OCH429--3.qxp 07.11.20 9:19 AM SW2 setting ON Page 80 Explanation for display Display detail Indoor setting temperature 62~86 62~86 (17~30:) Outdoor pipe temperature / Cond./ Eva. (TH6) -38~190 -38~190 (-39~88:) (When the temperature is 0˚F or less, “–” and temperature are displayed by turns.) Outdoor outside temperature (TH7) -38~190 -38~190 (-39~88:) (When the temperature is 0˚F or less, “–” and temperature are displayed by turns.
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OCH429--3.qxp 07.11.20 9:19 AM SW2 setting ON Page 81 Explanation for display Display detail 0~100 (When the capacity is 100%, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 100%; 0.5 secs. 0.5secs. 2 secs. 1 00 Capacity save 0~100 When air conditioner is connected to M-NET and capacity save mode is demanded, “0”~”100” is displayed. 1 2 3 4 5 6 Unit % When there is no setting of capacity save “100” is displayed.
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OCH429--3.qxp 07.11.20 9:19 AM SW2 setting Page 82 Display detail Explanation for display LEV-A opening pulse on error occurring 0~480 0~480 (When it is 100 pulse or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 130 pulse; 0.5 secs. 0.5secs. 2 secs.
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OCH429--3.qxp 07.11.20 9:19 AM SW2 setting Page 83 Display detail Explanation for display Unit Discharge superheat on error occurring SHd 0~327 0~327 (0~182degC) (When the temperature is 100degF or more, hundreds digit, tens digit and ones digit are displayed by turns.) (Example) When 150degF; 0.5 secs. 0.5secs. 2 secs.
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OCH429--3.qxp 07.11.20 9:19 AM SW2 setting Page 84 ON 1 2 3 4 5 6 Explanation for display Display detail Controlling status of compressor operating frequency 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 activated control is displayed.
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OCH429--3.qxp 07.11.20 9:19 AM 11 Page 85 EASY MAINTENANCE FUNCTION ● 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 Maintenance Function Discharge temperature 147˚F ● Conventional inspection work ●Outdoor unit ● ●Indoor unit ● Measure the intake air temperature.
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OCH429--3.qxp 07.11.20 9:19 AM Page 86 ● Data measurement When the operation is stabilized, measure operation data as explained below. (4) Press the [TEMP] buttons ( and ) to select the desired refrigerant address. [Screen B ] (5) Select the type of data to be displayed. After selecting, go to step (6).
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OCH429--3.qxp 12 07.11.20 9:19 AM Page 88 FUNCTION SETTING 12-1. UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER Each function can be set according to necessity 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.
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OCH429--3.qxp 07.11.20 9:19 AM Page 89 (2) Functions available when setting the unit number to 01-03 or AL (07 in 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.
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OCH429--3.qxp 07.11.20 9:19 AM Page 90 12-1-1. Selecting functions using the wired remote controller 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 1 to 0 .
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OCH429--4.qxp 07.11.20 9:20 AM Page 91 [Operating Procedure] 1 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 2 to 7 , fill in the "Check" column in Table 1, then change them as necessary. For initial settings, refer to the indoor unit's installation manual. 2 Switch off the remote controller.
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OCH429--4.qxp 07.11.20 9:20 AM Page 92 12-1-2. 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 refrigerant 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.
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OCH429--4.qxp 07.11.20 9:20 AM Page 93 12-2. FUNCTION SELECTION OF REMOTE CONTROLLER The setting of the following remote controller functions can be changed using the remote controller function selection mode. Change the setting when needed. Item 2 Item 1 Language setting to display 1.Change language ("CHANGE LANGUAGE") (1) Operation function limit setting (operation lock) ("LOCKING FUNCTION") 2.
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OCH429--4.qxp 07.11.20 9:20 AM [Function selection flowchart] Setting language (English) Page 94 Normal display (Display when the air conditioner is not running) Hold down the E button and press the D button for 2 seconds. E G D Hold down the E button and press the D button for 2 seconds. Remote controller function selection mode Item 1 G Change Language Press the operation mode button. Press theTIMER MENU button. Press theTIMER ON/OFF button.
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OCH429--4.qxp 07.11.20 9:20 AM Page 95 12-3. Function selection of wireless remote controller TEMPERATURE DISPLAY :/--F SETTING (Change of temp mode from -F to :) 1 Press the set button with something sharp at the end. MODEL SELECT 2 Press the 3 Press the blinks. AUTO START 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.
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OCH429--4.qxp 13 07.11.20 9:20 AM Page 96 MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER 13-1. HOW TO "MONITOR THE OPERATION DATA" • Turn on the [Monitoring the operation data] C Example) Request code "004" Discharge temperature 156˚F Refrigerant address "00" A D B (7) (3) (5) (1) (2) (6) (4) (1) Press the TEST A: Mode display B: Refrigerant address C: Data display area D: Request code display area button for 3 seconds so that [Maintenance mode] appears on the screen (at A).
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OCH429--4.qxp 07.11.20 9:20 AM Page 97 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.
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07.11.20 9:20 AM Request code OCH429--4.qxp Page 98 Description Request content (Display range) Unit 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.
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07.11.20 9:20 AM Request code OCH429--4.qxp Page 99 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.
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07.11.20 9:20 AM Request code OCH429--4.qxp Page 100 Description Request content (Display range) Unit 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.
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OCH429--4.qxp 07.11.20 9:20 AM Page 101 13-2-1.
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OCH429--4.qxp 07.11.20 9:20 AM Page 105 [Indoor unit – Model setting information] (Request code : 162) Data display 0 Display 0 See the table on the right.
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OCH429--4.qxp 14 07.11.20 9:20 AM Page 106 DISASSEMBLY PROCEDURE PUZ-A18NHA2 PUZ-A18NHA2-BS PHOTOS OPERATING PROCEDURE 1. Removing the top panel, service panel, front panel and Photo 1 back panel (1) Remove the top panel fixing screws (4 ✕ 10), one from the right and two from the left side, and detach the top panel. Top panel (2) Remove 1 service panel fixing screw (4 ✕ 10) and detach the service panel by pulling it downward. (See photo 1.
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OCH429--4.qxp 07.11.20 9:20 AM Page 107 OPERATING PROCEDURE PHOTOS 3. Removing the electrical parts box Photo 5 (1) Remove the service panel. (See photo 1.) (2) Remove the top panel. (See photo 1.) (3) Remove the front panel. (See photo 1.) (4) Disconnect the indoor/outdoor connecting wire from terminal block.
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OCH429--4.qxp 07.11.20 9:20 AM Page 108 OPERATING PROCEDURE PHOTOS 5. Removing the thermistor (TH7) Photo 7 (1) Remove the service panel. (See photo 1.) (2) Remove the top panel. (See photo 1.) (3) Disconnect 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 4.) (5) Pull out the thermistor (TH7) from the sensor holder.
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OCH429--4.qxp 07.11.20 9:20 AM Page 109 OPERATING PROCEDURE PHOTOS 8. Removing the 4-way valve Photo 10 (1) Remove the service panel. (See photo 1.) (2) Remove the top panel. (See photo 1.) (3) Remove the front panel. (See photo 1.) (4) Remove the conduit cover and cord cover. (See photo 2.) (5) Remove the back panel. (See photo 1.) (6) Remove the electrical parts box. (See photo 5.) (7) Remove the 4-way valve coil (See photo 8.) (8) Recover refrigerant. (9) Remove the welded part of four-way valve.
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OCH429--4.qxp 07.11.20 9:20 AM Page 110 OPERATING PROCEDURE PHOTOS 12. Removing the compressor (MC) (1) Remove the service panel. (See photo 1.) (2) Remove the top panel. (See photo 1.) (3) Remove the front panel. (See photo 1.) (4) Remove the conduit cover and cord cover. (See photo 2.) (5) Remove the back panel. (See photo 1.) (6) Remove the electrical parts box. (See photo 5.) (7) Remove 3 separator fixing screws (4 ✕ 10) and remove the separator. (8) Recover refrigerant.
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OCH429--4.qxp 07.11.20 9:20 AM Page 111 PUZ-A24/30/36NHA2 PUZ-A24/30/36NHA2-BS PHOTOS & ILLUSTRATION OPERATING PROCEDURE 1. Removing the service panel and top panel (1) Remove 3 service panel fixing screws (5 ✕ 10) and slide the hook on the right downward to remove the service panel. (2) Remove screws (3 for front, 3 for rear/5 ✕ 10) of the top panel and remove it.
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OCH429--4.qxp 07.11.20 9:20 AM Page 112 OPERATING PROCEDURE PHOTOS 4. Removing the thermistor (TH6) (1) Remove the service panel. (See figure 1.) (2) Remove the top panel. (See figure 1.) (3) Disconnect the connectors, TH6 and TH7 (red), on the controller circuit board in the electrical parts box. (4) Loosen the clamp for the lead wire in the rear of the electrical parts box. (5) Pull out the thermistor (TH6) from the sensor holder.
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OCH429--4.qxp 07.11.20 9:20 AM Page 113 PHOTOS OPERATING PROCEDURE 7. Removing the 4-way valve coil (21S4), linear expansion valve coil (LEV-A) and bypass valve coil (SV) (1) Remove the service panel. (See figure 1.) (2) Remove the top panel. (See figure 1.) (3) Remove the electrical parts box. (See photo 3.) [Removing the 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.
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OCH429--4.qxp 07.11.20 9:20 AM Page 114 OPERATING PROCEDURE PHOTOS 10. Removing the bypass valve (1) Remove the service panel. (See figure 1.) (2) Remove the top panel. (See figure 1.) (3) Remove the electrical parts box. (See photo 3.) (4) Remove 3 right side panel fixing screws (5 ✕ 10) in the rear of the unit and remove the right side panel. (5) Remove the bypass valve coil. (See photo 7.). (6) Recover refrigerant. (7) Remove the welded part of bypass valve.
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OCH429--4.qxp 07.11.20 9:20 AM Page 115 OPERATING PROCEDURE PHOTOS 13. Removing the reactor (DCL) (A30, 36) (1) Remove the service panel. (See figure 1.) (2) Remove the top panel. (See figure 1.) (3) Remove the electrical parts box. (See photo 3.) (4) Remove 4 reactor fixing screws (4 ✕ 10) and remove the reactor. w The reactor is attached to the rear of the electrical parts box. Photo 12 Reactor fixing screw Reactor (DCL) Reactor fixing screws 14.
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OCH429--4.qxp 07.11.20 9:20 AM Page 116 PUZ-A42NHA2 PUZ-A42NHA2-BS PHOTOS & ILLUSTRATION OPERATING PROCEDURE 1. Removing the service panel and top panel (1) Remove 3 service panel fixing screws (5 ✕ 10) and slide the hook on the right downward to remove the service panel. (2) Remove screws (3 for front, 3 for rear/5 ✕ 10) of the top panel and remove it. Figure 1 Top panel fixing screws Top panel Service panel Slide Grille fixing screws Fan grille Grille fixing screws 2.
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OCH429--4.qxp 07.11.20 9:20 AM Page 117 OPERATING PROCEDURE PHOTOS 4. Removing the thermistor (TH6) (1) Remove the service panel. (See figure 1.) (2) Remove the top panel. (See figure 1.) (3) Disconnect the connectors, TH6 and TH7 (red), on the controller circuit board in the electrical parts box. (4) Loosen the clamp for the lead wire in the rear of the electrical parts box. (5) Pull out the thermistor (TH6) from the sensor holder.
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OCH429--4.qxp 07.11.20 9:20 AM Page 118 PHOTOS OPERATING PROCEDURE 7. Removing the 4-way valve coil (21S4), and linear expansion valve coil (LEV-A) (1) Remove the service panel. (See figure 1.) (2) Remove the top panel. (See figure 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.
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OCH429--4.qxp 07.11.20 9:20 AM Page 119 OPERATING PROCEDURE PHOTOS 10. Removing the high pressure switch (63H) and low pressure switch (63L) (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 ✕ 10) in the rear of the unit and remove the right side panel. (4) Pull out the lead wire of high pressure switch and low pressure switch. (5) Recover refrigerant.
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OCH429--4.qxp 07.11.20 9:20 AM Page 120 OPERATING PROCEDURE 12. Removing the compressor (MC) (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 ✕ 10) and remove the front cover panel. (See photo 3.) (4) Remove 2 back cover panel fixing screws (5 ✕ 10) and remove the back cover panel. (5) Remove the electrical parts box. (See photo 3.