SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS Outdoor unit SERVICE MANUAL [model names] PUZ-A18NHA3 PUZ-A24NHA3 PUZ-A30NHA3 PUZ-A36NHA3 PUZ-A42NHA3 PUZ-A18NHA3-BS PUZ-A24NHA3-BS PUZ-A30NHA3-BS PUZ-A36NHA3-BS PUZ-A42NHA3-BS PUY-A12NHA3 PUY-A18NHA3 PUY-A24NHA3 PUY-A30NHA3 PUY-A36NHA3 PUY-A42NHA3 PUY-A12NHA3-BS PUY-A18NHA3-BS PUY-A24NHA3-BS PUY-A30NHA3-BS PUY-A36NHA3-BS PUY-A42NHA3-BS March 2009 No.OCH458 R410A [Service Ref.
1 REFERENCE MANUAL 1-1. INDOOR UNIT Service Manual No. Model name Service Ref. PLA-A12/18/24/30/36/42BA PLA-A12/18/24/30/36/42BA1 OCH420 OCB420 PCA-A24/30/36/42KA PCA-A24/30/36/42KA OCH455 OCB455 PKA-A12/18HA PKA-A12/18HAL PKA-A12/18HA PKA-A12/18HAL OCH456 OCB456 PKA-A24/30/36KA PKA-A24/30/36KAL PKA-A24/30/36KA.TH PKA-A24/30/36KAL.TH OCH457 OCB457 PEA-A12/18AA PEA-A12/18AA.TH 1-2. TECHNICAL DATA BOOK Manual No.
2 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. · Change flare nut to the one provided with this product.
[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. [2] Additional refrigerant charge When charging directly from cylinder · Check that cylinder for R410A on the market is syphon type.
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.
3 FEATURES PUZ-A18NHA3 PUZ-A18NHA3-BS PUY-A12/18NHA3 PUY-A12/18NHA3-BS PUZ-A24/30/36NHA3 PUZ-A24/30/36NHA3-BS PUY-A24/30/36NHA3 PUY-A24/30/36NHA3-BS PUZ-A42NHA3 PUZ-A42NHA3-BS PUY-A42NHA3 PUY-A42NHA3-BS CHARGELESS SYSTEM PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT. (Max. 100ft, 30m (A42) / Max. 70ft, 20m (A12-36)) The refrigerant circuit with LEV(Linear Expansion Valve) and accumulator always control the optimal refrigerant level regardless of the length (A42: 100ft, 30m max.
4 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) % No. Fan motor output Fan motor Airflow Sound level Cooling Heating Protection devices Dimension A A A PUZ-A18NHA3 PUZ-A18NHA3-BS PUZ-A24NHA3 PUZ-A24NHA3-BS 13 20 15 18 30 25 SNB130FPBM1 0.85 12 14 TNB220FLHM 1.3 12 14 Propeller fan % 1 0.040 0.
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) % No. Fan motor output Fan motor Airflow PUY-A12NHA3 PUY-A18NHA3 PUY-A24NHA3 PUY-A30NHA3 PUY-A36NHA3 PUY-A42NHA3 PUY-A12NHA3-BS PUY-A18NHA3-BS PUY-A24NHA3-BS PUY-A30NHA3-BS PUY-A36NHA3-BS PUY-A42NHA3-BS Single 60Hz 208/230V A A A 13 15 15 13 20 15 SNB130FPBM1 0.85 12 14 SNB130FPBM1 0.
5 DATA 5-1. REFILLING REFRIGERANT CHARGE (R410A : oz, kg) Service Ref.
5-3. NOISE CRITERION CURVES PUY-A12/18NHA3 PUY-A12/18NHA3-BS PUZ-A18NHA3 PUZ-A18NHA3-BS MODE SPL(dB) COOLING 46 HEATING 47 LINE PUY-A24/30/36NHA3 PUY-A24/30/36NHA3-BS PUZ-A24/30/36NHA3 PUZ-A24/30/36NHA3-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 = 0.0002 μbar) OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.
5-4. STANDARD OPERATION DATA 5-4-1. Heat pump Representative matching PKA-A18HA Mode Total Capacity Input Electrical circuit PKA-A36KA PLA-A42BA 18,000 19,000 24,000 26,000 30,000 32,000 34,200 37,000 42,000 45,000 W 2,240 1,970 2,270 2,330 4,130 3,150 5,030 3,610 4,600 4,450 PKA-A18HA PKA-A24KA PKA-A30KA PKA-A36KA PLA-A42BA Phase Single Single Single Single Single Cycle 60Hz 60Hz 60Hz 60Hz 60Hz Voltage 230V 230V 230V 230V 230V Current 0.33A 0.36A 0.
5-4-2. Cooling only Representative matching Mode Total Electrical circuit PKA-A24KA PKA-A30KA PKA-A36KA PLA-A42BA COOLING COOLING COOLING COOLING COOLING COOLING 12,000 18,000 24,000 30,000 34,200 42,000 W 1,190 2,240 2,270 4,130 5,030 4,600 PKA-A12HA PKA-A18HA PKA-A24KA PKA-A30KA PKA-A36KA PLA-A42BA Phase Single Single Single Single Single Single Cycle 60Hz 60Hz 60Hz 60Hz 60Hz 60Hz Voltage 230V 230V 230V 230V 230V 230V Current 0.33A 0.33A 0.36A 0.
OUTLINES AND DIMENSIONS 6 OUTDOOR UNIT PUZ-A18NHA3 PUZ-A18NHA3-BS PUY-A12/18NHA3 PUY-A12/18NHA3-BS 347.5<13-11/16> W33<1-5/16> drain hole 4-oval hole 32.5<1-9/32> 45.4<1-25/32> Air discharge 40<1-9/16> 18<23/32> 330<13> 300<11-13/16> 152<6> 155 Air intake 365<14-3/8> 43.6<1-23/32> 400<15-25/32> Air intake 23<29/32> 22<7/8> Service panel Service panel for charge plug Connection for liquid pipe FLARE W6.
FREE Min. 100mm <3-15/16> Service space Min. 10mm <3/8> Front piping hole (Knockout) Front trunking hole (Knockout) 65<2-9/16> 92<3-5/8> :92 > <3-5/8 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 Air Intake Handle ····Refrigerant GAS pipe connction (FLARE):15.88<5/8> ····Refrigerant LIQUID pipe connection (FLARE): 9.52<3/8> *1 ····Indication of STOP VALVE connection location.
Min. 150mm <5-29/32> Min. 10mm <3/8> Service space Min. 10mm<3/8> Min.
WIRING DIAGRAM 7 PUZ-A18NHA3 PUZ-A18NHA3-BS PUY-A12/18NHA3 PUY-A12/18NHA3-BS SYMBOL PFC IPM CB1~CB3 N.F. LI/LO NI/NO EI,E2,E3 52C C.B.
PUZ-A24NHA3 PUZ-A24NHA3-BS PUY-A24NHA3 PUY-A24NHA3-BS NAME Converter Power Module Main Smoothing Capacitor Noise Filter Circuit Board Connection Terminal Connection Terminal Connection Terminal 52C Relay Controller Circuit Board Switch Switch Switch Switch Switch Switch Switch SW4 SW5 SW6 SW7 SW8 SW9 SYMBOL LED1,LED2 F1~F4 SWP CN31 SS
PUZ-A30/36NHA3 PUZ-A30/36NHA3-BS PUY-A30/36NHA3 PUY-A30/36NHA3-BS [LEGEND] SYMBOL TB1 MC MF1 21S4 SV 63H TH3 TH6 TH7 TH8 TH32 LEV-A DCL CY1, CY2 ACTM NAME Terminal Block Motor for Compressor Fan Motor Solenoid Valve (Four-Way Valve) Solenoid Valve (Bypass Valve) High Pressure Switch Thermistor Thermistor Thermistor Thermistor Thermistor Electronic Expansion Valve Reactor Capacitor Active Filter Module SYMBOL P.B.
PUZ-A42NHA3 PUZ-A42NHA3-BS PUY-A42NHA3 PUY-A42NHA3-BS [LEGEND] SYMBOL TB1 MC MF1,MF2 21S4 63H 63L TH3 TH4 TH6 TH7 TH8 LEV-A DCL CY1, CY2 ACTM CB NAME Terminal Block Motor for Compressor Fan Motor Solenoid Valve (Four-Way Valve) High Pressure Switch Low Pressure Switch Thermistor Thermistor Thermistor Thermistor Thermistor Electronic Expansion Valve Reactor Capacitor Active Filter Module Main Smoothing Capacitor
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.
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 * The optional indoor power supply terminal kit is required.
8-3. INDOOR - OUTDOOR CONNECTING CABLE Wire No. % Size Outdoor power supply Max. 45m, 147ft Indoor unit-Outdoor unit Max. 50m, 164ft 3 % AWG15(polar) 3 % AWG13(polar) Max. 80m, 262ft 3 % AWG13(polar) and S3 separated + The max. cable length may vary depending on the condition of installation, humidity or materials, etc. Wire No. % Size Indoor/Outdoor separate power supply Max. 120m, 393ft Indoor unit-Outdoor unit 2 % Min. AWG22 + The optional indoor power supply terminal kit is necessary.
8-4. M-NET WIRING METHOD (Points to note) (1) Outside the unit, transmission wires should stay away from electric wires in order to prevent electromagnetic noise from making an influence on the signal communication. Place them at intervals of more than 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. board may burn out. (3) Use 2-core x 1.
● M-NET wiring (1) Use 2-core x 1.25mm2 [AWG16] shield wire for electric wires. M-NET terminal (Excluding the case connecting to system controller.) Ground 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.
9 REFRIGERANT SYSTEM DIAGRAM PUZ-A18NHA3(-BS) Unit: mm (inch) 4-way valve (#50) Strainer Refrigerant GAS pipe 12.7 (W1/2) <4-way valve solenoid coil> Heating : ON Cooling : OFF Service port(check) High pressure protect switch Stop valve (with service port) Outdoor heat exchanger Thermistor (TH6) Muffler Thermistor (TH3) Thermistor (TH32) Distributor Accumulator Compressor Refrigerant LIQUID pipe 6.
PUY-A12NHA3(-BS) PUY-A18NHA3(-BS) Stop valve (with service port) (#50) Strainer Refrigerant GAS pipe 12.7 (W1/2) Unit: mm (inch) Service port (Check) Outdoor heat exchanger High pressure protect switch Thermistor (TH6) Thermistor (TH3) Thermistor (TH32) Distributor Accumulator Compressor Refrigerant LIQUID pipe 6.35 (W1/4) (#100) Strainer Stop valve Refrigerant flow in cooling (#100) Strainer Linear expansion valve PUY-A24NHA3(-BS) PUY-A30NHA3(-BS) PUY-A36NHA3(-BS) Refrigerant GAS pipe 15.
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.
10 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.
"TEST RUN" and the currently selected operation mode are displayed altemately. Displays the remaining test run time. Operating procedures 1. Turn on the main power supply. While the room temperature display on the remote controller is “PLEASE WAIT”, the remote controller is disabled. Wait until “PLEASE WAIT” disappears before using remote controller. “PLEASE WAIT” appears for about 2 minutes after power supply is turned on. +1 2. Press TEST button twice. The TEST RUN appears on the screen. 3.
Test run [for wireless remote controller] COOL TEST RUN TEMP ON/OFF FAN AUTO STOP VANE AUTO START MODE , CHECK LOUVER min TEST RUN SET h RESET CLOCK 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. (Start this operation from the turned off status of remote controller display.
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. [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".
Press the 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. Cancel self-diagnosis. Self-diagnosis can be cancelled by the following 2 methods. Press the CHECK Press the button twice within 3 seconds. ON/OFF button.
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. • Check that the remote controller's display has stopped before continuing. 2. Press the temperature buttons.
• 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.
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 None — Judgment and action Case 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 (TB1) turned off.
Error Code F5 (5201) F9 (4119) EA (6844) Eb (6845) EC (6846) 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.
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 High comp.shell temperature (1) Abnormal if discharge temperature thermistor (TH4) exceeds 125:[257˚F] or 110: [230˚F] continuously for 5 minutes.
Error Code Abnormal point and detection method Open/short circuit of discharge temperature thermistor (TH4)/ comp.shell thermistor (TH32) Abnormal if open (3: [37˚F] or less) or short (217: [422˚F] or more) is detected U3 during compressor operation. (TH4 :5104) (Detection is inoperative for 10 minutes (TH32: 5132) of compressor starting process and for 10 minutes after and during defrosting.
Error Code U8 (4400) U9 (4220) UF (4100) Abnormal point and detection method Case Outdoor fan motor 1 Failure in the operation of the Abnormal if the rotational frequency of fan DC fan motor motor is not detected during DC fan motor 2 Failure in the outdoor circuit operation.
Error Code UP (4210) E0 or E4 E1 or E2 E3 or E5 Abnormal point and detection method Case Judgment and action Compressor overcurrent interruption 1 Stop valve of outdoor unit is Abnormal if overcurrent DC bus or comclosed. pressor is detected after compressor starts 2 Decrease of power supply voltoperating for 30 seconds.
Error Code E6 (6840) E8 (6840) E9 (6841) EF (6607 or 6608) Abnormal point and detection method Indoor/outdoor unit communication error (Signal receiving error) 1 Abnormal if indoor controller board could not receive any signal normally for 6 minutes after turning the power on. 2 Abnormal if indoor controller board could not receive any signal normally for 3 minutes.
Error Code P8 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. • Disconnected holder of pipe Note 1) It takes at least 9 min. to detect.
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 lightning surge.
From the previous page. Error Code Abnormal point and detection method Case 4. If displayed address or attribute is 1 During group operation with indoor unit of multi- refrigerant remote controller, system, if indoor unit transmit Indoor unit detects abnormality when to remote controller while outindoor unit transmitted to remote controldoor unit power supply of one ler and there was no reply (ACK). refrigerant system is turned off or within 2 minutes of restart, abnormality is detected.
Error Code A8 (6608) 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.
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. Factor Countermeasure 1The pair number settings of the wireless remote 1Check the pair number settings. controller and indoor controller board are mismatched. 5. When operating by the wireless remote controller, beep sound is heard, however, unit does not start operating.
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.
Symptoms: Nothing is displayed on the remote controller 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. AC 187V to AC 253V? NO • Troubles concerning power supply • Check the power wiring to the outdoor unit.
Symptoms: Nothing is displayed on the remote controller 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.
Symptoms: Nothing is displayed on the remote controller 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.
• Before repair Frequent calling from customers Phone Calls From Customers Unit does not operate at all. The operating display of remote controller does not come on. Unit cannot be restarted for a while after it’s stopped. Remote controller How to Respond Note Check if power is supplied to air conditioner. Nothing appears on the display unless power is supplied. Wait around 3 minutes to restart unit. The air conditioner is in a state of being protected by the microcomputer’s directive.
Phone Calls From Customers The room cannot be cooled or heated sufficiently. How to Respond Note 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. Check if filters are not dirty and clogged.
Phone Calls From Customers How to Respond Something is wrong with the blower….. Air blows out for a while after HEAT operation is stopped. 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. Something is wrong with the airflow direction…. The airflow direction is changed during COOL operation.
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 gets started in the room of high humidity. Water or moisture is expelled from the outdoor unt. Cooling: when pipes or piping joints are cooled, they get sweated and water drips down. Heating: water drips down from the heat exchanger. * 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-A18/24/30/36/42NHA3 PUZ-A18/24/30/36/42NHA3-BS PUY-A12/18/24/30/36/42NHA3 PUY-A12/18/24/30/36/42NHA3-BS Check points Parts name Thermistor (TH3) Disconnect the connector then measure the resistance with a tester.
Check method of DC fan motor (fan motor / outdoor controller circuit board) Notes · High voltage is applied to the connecter (CNF1, 2) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNF1, 2) for the motor with the power supply on. (It causes trouble of the outdoor controller circuit board and fan motor.) Self check Symptom : The outdoor fan cannot turn around. Fuse check Check the fuse (F5) on outdoor controller board.
10-7. HOW TO CHECK THE COMPONENTS Low temperature thermistors 50 • 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 )} 1 1 T (˚F): RT =15exp{3480( 273+(T– 32)/1.8 – 273 )} 30 20 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.
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.
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.
(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. Otherwise pipes can bend due to pressure.
(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. Otherwise pipes can bend due to pressure.
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. LWhen 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) 27:, 81°F 20.
10-9. TEST POINT DIAGRAM Outdoor controller circuit board PUZ-A18/24/30/36/42NHA3 PUZ-A18/24/30/36/42NHA3-BS PUY-A12/18/24/30/36/42NHA3 PUY-A12/18/24/30/36/42NHA3-BS SW7 Demand control setting SW1 Forced defrost, detect history record reset, refrigerant address TEST POINT1 is high voltage.
Outdoor noise filter circuit board PUZ-A18NHA3 PUZ-A18NHA3-BS PUY-A12/18NHA3 PUY-A12/18NHA3-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.
Outdoor noise filter circuit board PUZ-A24NHA3 PUZ-A24NHA3-BS PUY-A24NHA3 PUY-A24NHA3-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.
Outdoor noise filter circuit board PUZ-A30/36/42NHA3 PUZ-A30/36/42NHA3-BS PUY-A30/36/42NHA3 PUY-A30/36/42NHA3-BS CN52C 52C driving signal (Connect to the outdoor controller circuit board (CN52C)) RS1 LO, NO Voltage of 208/230V AC is output (Connect to the outdoor power circuit board (TABS, TABT)) CNAC1, CNAC2 208/230V AC (Connect to the outdoor controller circuit board (CNAC)) E2 Connect to the earth CN5 Primary current (Connect to the outdoor power circuit board (CN5)) EI Connect to the earth LI, NI
Outdoor power circuit board PUZ-A18NHA3 PUZ-A18NHA3-BS PUY-A12/18NHA3 PUY-A12/18NHA3-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.
Outdoor power circuit board PUZ-A30/36/42NHA3 PUZ-A30/36/42NHA3-BS PUY-A30/36/42NHA3 PUY-A30/36/42NHA3-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.
Active filter module PUZ-A30/36/42NHA3 PUY-A30/36/42NHA3 PUZ-A30/36/42NHA3-BS PUY-A30/36/42NHA3-BS P Connect to the outdoor power circuit board (TABP2) L1, L2 Connect to the DCL (Reactor) N1 Non-connect Lower side Upper side + N2 Non-connect Connect to the outdoor power circuit board (TABP1) Connect to the outdoor power circuit board (CNAF) 1 : GND 2-1 : 18V DC 3-1 : Control signal 4, 5 : Not used 6-1 : Control signal Connect to the outdoor power circuit board (TABN1) Connection and internal cir
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 +1 2 Abnormal history clear Effective timing ON OFF Start Normal When compressor is working in heating operation.
Type of Switch No. Switch 1 SW5 No function Dip switch SW9 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 +3 2 Always 3 Max. Hz setting(cooling) Max. Hz(cooling) % 0.8 Normal Always 4 Max. Hz setting(heating) Max. Hz(heating) % 0.
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. Adding a commercial timer or on-off switch contactor setting to the CNDM connector which is optional contactor for demand input located on the outdoor controller board enables to control compressor operation frequency.
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 Outdoor controller board LED1 (Green) LED2 (Red) Error Contents Error code +1 3 blinking 1 blinking Abnormality of shell thermistor (TH32) U2 and discharging temperature (TH4) Inspection method Detailed reference page Check if stop valves are open. Check if connectors (TH4, TH32, LEV-A) on outdoor controller board are not disconnected. Check if unit is filled with specified amount of refrigerant.
[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’.
SW2 setting ON Explanation for display Display detail Pipe temperature / Liquid(TH3) – 40~194 – 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. 1 2 3 4 5 6 Unit ˚F 10 ON 1 2 3 4 5 6 ON Discharge temperature (TH4) A42 37~327 (3~164:) Comp.
SW2 setting ON 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. 15 ˚F Compressor shell temperature (TH32) or 37~327 (3~164:) discharge temperature (TH4) on error (When the temperature is 100˚F or more, the hundreds digit, tens digit and ones digit are occurring 37~327 displayed by turns.
SW2 setting Explanation for display Display detail The number of connected indoor units ON 0~3 (The number of connected indoor units are displayed.
SW2 setting ON Explanation for display Display detail Indoor setting temperature 62~86 62~86 (17~30:) Outdoor pipe temperature / 2-phase pipe (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.
SW2 setting ON 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.
SW2 setting 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. 0.5 secs. 2 secs. 1 30 ON 1 2 3 4 5 6 ON Indoor room temperature (TH1) on error occurring 46~102 Unit Pulse 46~102 (8~39°C) ˚F 1 2 3 4 5 6 ON Indoor pipe temperature / Liquid (TH2) on error occurring -38~190 1 2 3 4 5 6 ON Indoor pipe temperature / Cond.
SW2 setting 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. 0.5 secs. 2 secs. 1 50 degF ON 1 2 3 4 5 6 Cooling = TH4 (or TH32)-TH6 Heating = TH4 (or TH32)-TH5 0~234 (0~130degC) (When the temperature is 100degF or more, hundreds digit, tens digit and ones digit are displayed by turns.
SW2 setting 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 ON 1 2 3 4 5 6 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.
11 EASY MAINTENANCE FUNCTION L Reduces maintenance work drastically. L 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 L Conventional inspection work LOutdoor unit L LIndoor unit L Measure the intake air temperature. Remove the service panel.
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 ] (5) Select the type of data to be displayed. After selecting, go to step (6).
11-2.GUIDE FOR OPERATION CONDITION Good Retightened Indoor Unit Good Retightened M V Accumulated operating time Cleanliness CleanliTemperature Temperature ness Enter the temperature differences between , , and 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 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.
(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. • When setting functions for a simultaneous twin indoor unit system, set the unit number to 01 to 03 for each indoor unit in case of selecting different functions for each unit referring to 4 setting the indoor unit number.
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 to . Setting number Refrigerant address Unit number Mode number Modes 01 to 14 can be activated by pressing buttons and simultaneously, and modes 15 to 28 by pressing buttons and .
[Operating Procedure] Check the setting items provided by function selection. If settings for a mode are changed by function selection, the functions of that mode will be changed accordingly. Check all the current settings according to steps to , fill in the "Check" column in Table 1, then change them as necessary. For initial settings, refer to the indoor unit's installation manual. Switch off the remote controller.
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.
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.
[Function selection flowchart] Setting language (English) Normal display (Display when the air conditioner is not running) Hold down the button and press the button for 2 seconds. Hold down the button and press the button for 2 seconds. Remote controller function selection mode Item 1 Change Language Press the operation mode button. Press theTIMER MENU button. Press theTIMER ON/OFF button. Item 2 English Dot display German Spanish TEMP.
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 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" • Turn on the [Monitoring the operation data] Example) Request code "004" Discharge temperature 156°F Refrigerant address "00" (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 ).
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.
[Fan control state] (Request code : "53") Data display 0 0 Fan step correction value by heatsink temperature overheat prevention control Fan step correction value by cool condensation temperature overheat prevention control Display - (minus) 0 1 2 Correction value –1 0 +1 +2 [Actuator output state] (Request code : "54") Data display 0 0 Actuator output state Actuator output state Actuator output state Actuator output state Display SV1 0 1 ON 2 3 ON 4 5 ON 6 7 ON 8 9 ON A b ON C d E F
[Contact demand capacity] (Request code : "61") Data display 0 0 Setting content 0 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 Input state 0 0 0 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") Data display 9 10 11 14 20 25 Capacity 12 18 24 30 36 42 [Outdoor
[Outdoor unit switch setting display (SW1 to SW10, except SW3)] Request codes : 73 to 82 0: Switch OFF 1: Switch ON SW1, SW2, SW6, SW7 Data display 1 2 3 4 5 6 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1
[Indoor unit – Model setting information] (Request code : 162) Data display 0 Display 0 See the table on the right.
14 DISASSEMBLY PROCEDURE PUZ-A18NHA3 PUZ-A18NHA3-BS PHOTOS OPERATING PROCEDURE 1. Removing the top panel, service panel, front panel and 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. Photo 1 Top panel (2) Remove 1 service panel fixing screw (4 × 10) and detach the service panel by pulling it downward. (See photo 1.
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.
OPERATING PROCEDURE PHOTOS Photo 7 5. Removing the thermistor (TH7) (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.
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.
OPERATING PROCEDURE PHOTOS Photo 13 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) Remove the thermistor (TH32). (Refer to 6.) (9) Recover refrigerant.
PUZ-A24/30/36NHA3 PUZ-A24/30/36NHA3-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 Slide Service panel Service panel fixing screws Fan grille Cover panel Grille fixing screws 2.
OPERATING PROCEDURE PHOTOS Photo 4 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. Controller circuit board (C.B.
PHOTOS OPERATING PROCEDURE 8. 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.
OPERATING PROCEDURE PHOTOS 11. 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 8.). (6) Recover refrigerant. (7) Remove the welded part of bypass valve. Photo 10 Note 1: Recover refrigerant without spreading it in the air.
OPERATING PROCEDURE PHOTOS 14. 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 13 Reactor fixing screw Reactor (DCL) Reactor fixing screws 15. Removing the compressor (MC) (1) Remove the service panel. (See figure 1.
PUZ-A42NHA3 PUZ-A42NHA3-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. Removing the fan motor (MF1, MF2) (1) Remove the service panel.
PHOTOS OPERATING PROCEDURE 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. Photo 4 Controller circuit board (C.B.
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.
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. (6) Remove the welded part of high pressure switch and low pressure switch.
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.) (6) Remove 3 valve bed fixing screws (4 × 10), 4 ball valve and stop valve fixing screws (5 × 16), then remove the valve bed.
