Mitsubishi Electric PUZ-A12NKA8 Service Manual
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Mitsubishi Electric PUZ-A12NKA8 Service Manual

Mitsubishi Electric PUZ-A12NKA8 Service Manual

Heat pump, r410a, outdoor unit
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Outdoor unit
[Model Name]
PUZ-A12NKA8
PUZ-A18NKA8
PUZ-A24NHA8
PUZ-A30NHA8
PUZ-A36NKA8
PUZ-A42NKA8
PUY-A12NKA8
PUY-A18NKA8
PUY-A24NHA8
PUY-A30NHA8
PUY-A36NKA8
PUY-A42NKA8
[Service Ref.]
PUZ-A12NKA8
PUZ-A18NKA8
PUZ-A24NHA8
PUZ-A30NHA8
PUZ-A36NKA8
PUZ-A42NKA8
PUY-A12NKA8
PUY-A18NKA8
PUY-A24NHA8
PUY-A30NHA8
PUY-A36NKA8
PUY-A42NKA8
PUZ-A24/30NHA8
PUY-A24/30NHA8
R410A
CONTENTS
1. REFERENCE MANUAL ······················· 2
2. SAFETY PRECAUTION ······················· 2
3. FEATURES ······································· 6
4. SPECIFICATIONS ······························ 7
5. DATA ················································ 8
6. OUTLINES AND DIMENSIONS ··········· 12
7. WIRING DIAGRAM ··························· 15
8. WIRING SPECIFICATIONS ················ 18
10. TROUBLESHOOTING ······················· 23
12. FUNCTION SETTING ························ 80
BY THE REMOTE CONTROLLER ······· 81
14. DISASSEMBLY PROCEDURE ············ 89
15. REMOTE CONTROLLER ··················105
PARTS CATALOG (OCB764)
1
October 2024
No. OCH764
REVISED EDITION-B
Revision:
• Some errors in OUTLINES
AND DIMENSIONS have
been modified in REVISED
EDITION-B.
OCH764A is void.
Notes:
• This manual describes service
data of the outdoor units only.

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Summary of Contents for Mitsubishi Electric PUZ-A12NKA8

  • Page 1: Table Of Contents

    SPLIT-TYPE, AIR CONDITIONERS October 2024 No. OCH764 SERVICE MANUAL R410A REVISED EDITION-B Outdoor unit [Service Ref.] [Model Name] Revision: PUZ-A12NKA8 • Some errors in OUTLINES PUZ-A12NKA8 AND DIMENSIONS have PUZ-A18NKA8 PUZ-A18NKA8 been modified in REVISED EDITION-B. PUZ-A24NHA8 PUZ-A24NHA8 OCH764A is void.

  • Page 2: Reference Manual

    REFERENCE MANUAL INDOOR UNIT Service manual No. Model name Service Ref. Parts catalog No. TCH120 PLA-A12/18/24/30/36/42EA8 PLA-A12/18/24/30/36/42EA8 TCB106 TCH113 PCA-A24/30/36/42KA8 PCA-A24/30/36/42KA8.TH TCB113 TCH115 PKA-A24/30/36KA8 PKA-A24/30/36KA8.TH TCB115 TCH117 PKA-A12/18LA1 PKA-A12/18LA1.TH TCB117 HWE2109A PEAD-A12/18/24/30/36/42AA8 PEAD-A12/18/24/30/36/42AA8 BWE02204A MD-1404-K011 PVA-A12/18/24/30/36/42AA7 PVA-A12/18/24/30/36/42AA7 MD-1404-K012 PAA-A18, 24, 30, 36, 42AA1/BA1/CA1 PAA-A18, 24, 30, 36, 42AA1/BA1/CA1 MD-2025-K005 SAFETY PRECAUTION...
  • Page 3 2-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R410A Use a vacuum pump with a reverse flow check Use new refrigerant pipes. valve. In the case of using the existing pipes for R22, be careful Vacuum pump oil may flow back into refrigerant cycle and with the following: that can cause deterioration of refrigerant oil, etc.

  • Page 4: Cautions For Service

    [1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them. [2] Additional refrigerant charge When charging directly from cylinder (1) Check that cylinder for R410A on the market is a syphon type.
  • Page 5 2-3. CAUTIONS FOR REFRIGERANT PIPING WORK New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the working pressure of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.

  • Page 6: Low Ambient Cooling

    • It needs at least 12 hr standby to operation in order to warm the electrical parts. Note: During cooling operation under low ambient temperature, the bottom fan motor of A36/42N stops occasionally. This is an intended feature, not a malfunction. FEATURES PUZ-A12NKA8 PUZ-A24NHA8 PUZ-A36NKA8 PUZ-A18NKA8...

  • Page 7: Specifications

    SPECIFICATIONS PUZ-A12NKA8 PUZ-A18NKA8 PUZ-A24NHA8 PUZ-A30NHA8 PUZ-A36NKA8 PUZ-A42NKA8 Service Ref. PUY-A12NKA8 PUY-A18NKA8 PUY-A24NHA8 PUY-A30NHA8 PUY-A36NKA8 PUY-A42NKA8 Power Phase Single supply Frequency 60 Hz Voltage 208/230 V MOCP Breaker size External finish Munsell 3Y 7.8/1.1 Cross fin Heat exchanger Defrost method Reverse cycle ―...

  • Page 8: Data

    ― ― ― ― ― ― ― ― 71 oz 71 oz 71 oz 73 oz 75 oz 77 oz 71 oz PUZ-A12NKA8 ― ― ― ― ― ― ― ― ― ― ― ― ― ― 2.0 kg 2.0 kg 2.0 kg 2.1 kg 2.1 kg 2.2 kg 2.0 kg...

  • Page 9: Noise Criterion Curves

    5-3. NOISE CRITERION CURVES PUZ-A12/18NKA8 SPL(dB) MODE LINE PUZ-A24/30NHA8 SPL(dB) MODE LINE COOLING COOLING PUY-A12/18NKA8 PUY-A24/30NHA8 HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR NC-20 HEARING FOR NC-20 CONTINUOUS CONTINUOUS NOISE...

  • Page 10: Standard Operation Data

    0.80 A 0.80 A 1.60 A 1.60 A 3.30 A 3.30 A 3.30 A 3.30 A 4.40 A 4.40 A 4.50 A 4.50 A Outdoor unit model PUZ-A12NKA8 PUZ-A18NKA8 PUZ-A24NHA8 PUZ-A30NHA8 PUZ-A36NKA8 PUZ-A42NKA8 Phase Single Single Single Single Single Single...

  • Page 11: Cooling Only

    5-4-2. Cooling only Representative matching PVA-A12AA7 PVA-A18AA7 PVA-A24AA7 PVA-A30AA7 PVA-A36AA7 PVA-A42AA7 Mode COOLING COOLING COOLING COOLING COOLING COOLING Total Capacity Btu/h 12,000 18,000 24,000 30,000 36,000 42,000 Input 1,570 1,960 3,000 3,250 4,150 Indoor unit model PVA-A12AA7 PVA-A18AA7 PVA-A24AA7 PVA-A30AA7 PVA-A36AA7 PVA-A42AA7 Phase...

  • Page 12: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PUZ-A12NKA8 PUZ-A18NKA8 PUY-A12NKA8 PUY-A18NKA8 Unit: mm<in> OCH764B...
  • Page 13 PUZ-A24NHA8 PUZ-A30NHA8 PUY-A24NHA8 PUY-A30NHA8 Unit: mm<in> OCH764B...
  • Page 14 PUZ-A36NKA8 PUZ-A42NKA8 PUY-A36NKA8 PUY-A42NKA8 Unit: mm<in> OCH764B...

  • Page 15: Wiring Diagram

    WIRING DIAGRAM PUZ-A12NKA8 PUZ-A18NKA8 PUY-A12NKA8 PUY-A18NKA8 When M-NET Adapter is connected (Refer to I.M. of M-NET Adapter for how to install.) （WH） M-NET ADAPTER CN2M （WH） （WH） PUZ only A B S 21S4 LEV-A LEV-B M-NET TH33 TH32 TH7 TH6 3～...
  • Page 16 PUZ-A24NHA8 PUZ-A30NHA8 PUY-A24NHA8 PUY-A30NHA8 OCH764B...
  • Page 17 PUZ-A36NKA8 PUZ-A42NKA8 PUY-A36NKA8 PUY-A42NKA8 When M-NET adaptor is connected (Refer to I.M. of M-NET Adapter for how to install. Group is E) LEV-A LEV-B TH33 TH32 TH7 TH6 TH3 TH4 （WH） C. B. 。 。 。 。 。 。 CNF1 M-NET ADAPTER （WH）...

  • Page 18: Wiring Specifications

    WIRING SPECIFICATIONS 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. 1:1 System A12/18/24/30 A36/42 Outdoor unit power supply Outdoor unit power supply Wiring circuit breaker or isolating switch Wiring circuit breaker or isolating switch Outdoor unit Outdoor unit...

  • Page 19: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PUZ-A12NKA8 PUZ-A18NKA8 Unit: inch [mm] Thermistor TH7 <4-way valve solenoid coil> Heat exchanger Heating: ON (Outdoor ambient) 4-way valve Cooling: OFF Stop valve Charge plug Thermistor TH6 (with service port) (Outdoor 2-phase pipe) Refrigerant GAS pipe [1/2 [12.7 mm]...
  • Page 20 PUZ-A36NKA8 PUZ-A42NKA8 Unit: inch [mm] <4-way valve solenoid coil> Thermistor TH7 Heating: ON (Outdoor) Heat exchanger Cooling: OFF Thermistor TH6 (Outdoor 2-phase pipe) Stop valve 4-way valve Refrigerant GAS pipe [5/8 [15.88 mm] Strainer Charge plug Thermistor TH3 (High pressure) Muffler (Outdoor pipe) Charge plug...
  • Page 21 PUY-A24NHA8 PUY-A30NHA8 Unit: inch [mm] Thermistor TH7 (Outdoor ambient) Heat exchanger Thermistor TH6 (Outdoor 2-phase pipe) Stop valve Refrigerant GAS pipe [5/8 [15.88 mm] Strainer Charge plug Thermistor TH3 (High pressure) Muffler (Outdoor liquid pipe) Charge plug (Low pressure) High pressure Distributor switch 63H Thermistor TH32...
  • Page 22 1. Refrigerant collecting (pump down) Perform the following procedures to collect the refrigerant when moving the indoor unit or the outdoor unit. Supply power (circuit breaker). • When power is supplied, make sure that “CENTRALLY CONTROLLED” is not displayed on the remote controller. If “CENTRALLY CONTROLLED”...

  • Page 23: Troubleshooting

    TROUBLESHOOTING 10-1. TROUBLESHOOTING <Check code displayed by self-diagnosis and actions to be taken for service (summary)> Present and past check codes are logged, and they can be displayed on the wired remote controller and control board of out- door unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summa- rized in the table below.
  • Page 24 10-3. SELF-DIAGNOSIS ACTION TABLE <Abnormalities detected when the power is turned on> Note: Refer to indoor unit section for code P and code E. Check code Abnormal points and detection method Cause judgment and action No voltage is supplied to terminal Check following items.
  • Page 25 Check code Abnormal points and detection method Cause judgment and action Miswiring of indoor/outdoor unit Contact failure or miswiring of Check disconnection or looseness or polarity indoor/outdoor unit connecting wire connecting wire of indoor/outdoor unit connecting wire of Outdoor controller circuit board can indoor and outdoor units.
  • Page 26 <Abnormalities detected while unit is operating> Check code Abnormal points and detection method Cause judgment and action High discharge temperature Overheated compressor opera- Check intake superheat. High comp. surface temperature tion caused by shortage of Check leakage of refrigerant. Abnormal if discharge temperature ther- refrigerant Charge additional refrigerant.
  • Page 27 Check code Abnormal points and detection method Cause judgment and action Open/short of outdoor unit thermistors Disconnection or contact failure Check connection of connector (TH3,TH6/TH7, TH32) on the outdoor controller circuit board. (TH3, TH6, TH7, TH8 and TH32 ) of connectors Check connection of connector (CN3) on the Abnormal if open or short is detected during Outdoor controller circuit...
  • Page 28 Check code Abnormal points and detection method Cause judgment and action To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2, and 2-6. Detailed Refer to "10-9. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS". codes Overvoltage error Abnormal increase in power Check the field facility for the power supply.
  • Page 29 Check code Abnormal points and detection method Cause judgment and action Compressor overcurrent interruption Stop valve is closed. Open stop valve. (When compressor locked) Decrease of power supply voltage Check facility of power supply. Abnormal if overcurrent of DC bus or Looseness, disconnection or Correct the wiring (U·V·W phase) to compressor is detected within 30 seconds...
  • Page 30 Check code Abnormal points and detection method Cause judgment and action Remote controller transmission error Contact failure at transmission Check disconnection or looseness of indoor (E0)/signal receiving error (E4) wire of remote controller unit or transmission wire of remote controller. Abnormal if main or sub remote control- All remote controllers are set Set one of the remote controllers “main”.
  • Page 31 Check code Abnormal points and detection method Cause judgment and action Indoor/outdoor unit communication error Contact failure of indoor/out- Check disconnection or looseness of indoor/ (Signal receiving error) door unit connecting wire outdoor unit connecting wire of indoor or out- (Outdoor unit) Defective communication circuit door units.
  • Page 32 Check code Abnormal points and detection method Cause judgment and action Abnormal refrigerant circuit Abnormal operation of 4-way When this error occurs, be sure to replace During Cooling, Dry, or Auto Cooling valve the 4-way valve. operation, the following conditions are Disconnection of or leakage in Check refrigerant pipes for disconnection or regarded as failures when detected for 1...
  • Page 33 Check code Abnormal points and detection method Cause judgment and action NO ACK signal Common factor that has no rela- Always try the following when the error tion with abnormality source. “A7” occurs. Transmitting side controller detects The unit of former address Turn off the power supply of outdoor unit abnormal if a message was transmitted does not exist as address...
  • Page 34 From the previous page. Check code Abnormal points and detection method Cause judgment and action If displayed address or attribute is During sequential operation Same as mentioned in "A7" of the previous of indoor unit and FRESH FRESH MASTER, page. MASTER of other refrigerant Indoor unit detects abnormality when system, if indoor unit transmits...
  • Page 35 10-4. TROUBLESHOOTING OF PROBLEMS Phenomena Factor Countermeasure Remote controller display does not 12 VDC is not supplied to remote controller. Check LED2 on indoor controller board. work. (1) When LED2 is lit, (Power supply display is not indicated on LCD.) check the remote controller wiring for 12–15 VDC is supplied to remote controller, how- breaking or contact failure.
  • Page 36 Phenomena Factor Countermeasure Remote controller display works Refrigerant shortage If refrigerant leaks, discharging normally and the unit performs cool- temperature rises and LEV opening ing operation, however, the capacity increases. cannot be fully obtained. (The air Inspect leakage by checking the does not cool well.) temperature and opening.
  • Page 37 Symptoms: “PLEASE WAIT” is kept being displayed on the remote controller. Inspection method and Diagnosis flow Cause troubleshooting Check the display time of “PLEASE WAIT” after turning on the main power. 6 minutes 2 minutes or more or less How long is “PLEASE WAIT” •...
  • Page 38 LED display of the indoor controller board LED1: Symptoms: Nothing is displayed on the remote controller. 1 LED2: LED3: Inspection method and Diagnosis flow Cause troubleshooting Check the voltage between S1 and S2 on the terminal block (TB4) of the indoor unit. 198 to 264 V AC? Check the voltage among L1 and L2 on the terminal block (TB1) of the...
  • Page 39 LED display of the indoor controller board LED1: Symptoms: Nothing is displayed on the remote controller. 2 LED2: LED3: Inspection method and Diagnosis flow Cause troubleshooting Check the voltage between S1 and S2 on the terminal block (TB4) of the indoor unit. 198 to 264 V AC? Not lighting.
  • Page 40 LED display of the indoor controller board LED1: Symptoms: Nothing is displayed on the remote controller. 3 LED2: LED3: — Inspection method and Diagnosis flow Cause troubleshooting Check the voltage of the terminal block (TB6) of the remote controller. 10 to 16 V DC? •...
  • Page 41 • Before repair Frequent calls from customers Phone Calls From Customers How to Respond Note 1 The operating display of remote 1 Check if power is supplied to air conditioner. Unit does not operate controller does not come on. Nothing appears on the display unless power is at all.
  • Page 42 Phone Calls From Customers How to Respond Note The room cannot be cooled or heated sufficiently. Check the set temperature of remote controller. The outdoor unit cannot be operated if the set temperature is not appropriate. The outdoor unit operates in the following modes. COOL: When the set temperature is lower than the room temperature.
  • Page 43 Phone Calls From Customers How to Respond Note However, this control is also Something Air blows out for a while after This is not a malfunction. is wrong HEAT operation is stopped. The blower is operating just for cooling down the applied to the models which with the heated-up air conditioner.
  • Page 44 Phone Calls From Customers How to Respond Note A white mist is expelled from the indoor unit. This is not a malfunction. This may occur when the operation is started in the room of high humidity. Water or moisture is expelled from the outdoor COOL: when pipes or piping joints are cooled, they unit.

  • Page 45: How To Check The Parts

    10-5. HOW TO CHECK THE PARTS Parts name Checkpoints Thermistor (TH3) Disconnect the connector then measure the resistance with a multimeter. <Liquid> (At the ambient temperature 50 to 86°F [10 to 30°C]) Thermistor (TH4) <Discharge> Normal Abnormal Thermistor (TH6) < 2-phase pipe> 160 to 410 kΩ...
  • Page 46 10-5-1. Check method of outdoor controller circuit board PUZ-A12NKA8 PUZ-A18NKA8 PUY-A12NKA8 PUY-A18NKA8 PNC board check Is the voltage of main incoming Check the breaker and power supply. power 198–253 VAC? Turn off the incoming power supply and Is the voltage of bus bar voltage check the resistance of PTC1and PTC2 on (between DS1 "+"...
  • Page 47 PUZ-A24NHA8 PUZ-A30NHA8 PUZ-A36NKA8 PUZ-A42NKA8 PUY-A24NHA8 PUY-A30NHA8 PUY-A36NKA8 PUY-A42NKA8 Outdoor controller circuit board check Fuse check Check the fuse on outdoor controller circuit board. Yes (blow) Did the fuse (F1 and F2) blow? Check the indoor controller board wiring. Yes (blow) Did the fuse (F3 and F4) blow? Check the wiring for SV2 and 21S4*.
  • Page 48 10-5-2. Check method of power circuit board PUZ-A24NHA8 PUZ-A30NHA8 PUY-A24NHA8 PUY-A30NHA8 Power board check Note: To check the voltage of the parts on this board with a tester is difficult due to its location. Test points are limited. Is the voltage of main incoming power •...
  • Page 49 PUZ-A36NKA8 PUZ-A42NKA8 PUY-A36NKA8 PUY-A42NKA8 Note: To check the voltage of the parts on this board with a multimeter is difficult due to its location. Power board check Test points are limited. Is the voltage of main incoming power • Check the breaker and power supply. 198–253 V AC? Turn off the incoming power supply Is the voltage of CNDC(PNK) on outdoor...
  • Page 50 10-5-3. Check method of DC fan motor (fan motor/outdoor controller circuit board) Notes · High voltage is applied to the connector (CNF1, 2) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNF1, 2) for the motor with the power supply on. (It causes trouble of the outdoor multi controller circuit board and fan motor.) Self check Symptom: The outdoor fan cannot rotate.
  • Page 51 10-6. HOW TO CHECK THE COMPONENTS <Thermistor feature chart> Low temperature thermistors • Thermistor <Liquid> (TH3) • Thermistor <2-phase pipe> (TH6) • Thermistor <Ambient> (TH7) • Thermistor <Suction> (TH32) Thermistor R0 = 15 kΩ ± 3% B constant = 3480 ± 1% =15exp{3480( 273+t –...

  • Page 52: Linear Expansion Valve

    Linear expansion valve (A12, 18, 24, 30) (1) Operation summary of the linear expansion valve • Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board. • Valve position can be changed in proportion to the number of pulse signal. <Connection between the outdoor controller board and the linear expansion valve>...
  • Page 53 Linear expansion valve (A36, 42) (1) Operation summary of the linear expansion valve • Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board. • Valve position can be changed in proportion to the number of pulse signal. <Connection between the outdoor controller board and the linear expansion valve>...
  • Page 54 (3) How to attach and detach the coil of linear expansion valve (A12, 18, 24, 30) <Composition> Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Linear expansion valve Coil Main body Coil fixing sheet metal Stopper...
  • Page 55 (4) How to attach and detach the coil of linear expansion valve (A36, 42) <Composition> Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Main body Stopper Coil Lead wire <How to detach the coil> Hold the lower part of the main body (shown as A) firmly so that the main body does not move and detach the coil by pulling it upward.

  • Page 56: Emergency Operation

    10-7. EMERGENCY OPERATION (1) When the check codes shown below are displayed on outdoor unit or microprocessor for wired remote controller or indoor unit has a failure, but no other problems are found, emergency operation will be available by setting the emergency opera- tion switch (SWE) to ON and short-circuiting the connector (CN31) on outdoor controller board.
  • Page 57 (5) Operation data during emergency operation During emergency operation, no communication is performed with the indoor unit, so the data items needed for operation are set to the following values: Operation mode Operation data Remarks COOL HEAT Intake temperature (TH1) 81°F [27°C] 69°F [20.5°C] Indoor fluid pipe temperature (TH2)

  • Page 58: Test Point Diagram

    Brief Check of POWER MODULE Outdoor controller circuit board If they are short-circuited, it means that they are broken. Measure the resistance in the following points (connectors, etc.). PUZ-A12NKA8 PUZ-A18NKA8 1. Check of Diode (DS1, DS2) PUY-A12NKA8 P - L1, P - N1, N - L1, N - N1 2.

  • Page 59: Switch Board

    Switch board PUZ-A12NKA8 PUZ-A18NKA8 PUY-A12NKA8 PUY-A18NKA8 CN31 Emergency operation Pump down Demand/silent mode setting Model select A-control Test operation service kit Power failure automatic recovery/ compressor frequency setting manual defrost, delete "error history" CNSW and refrigerant address setting Connect to...
  • Page 60 Outdoor controller circuit board PUZ-A24NHA8 PUZ-A30NHA8 PUY-A24NHA8 PUY-A30NHA8 Demand control setting Manual defrost, detect CNDM Model select history record reset, : Input of low-level refrigerant address sound priority CN51 mode External signal output : Input of external • Compressor operating signal contact point •...
  • Page 61 Outdoor controller circuit board PUZ-A36NKA8 PUZ-A42NKA8 <CAUTION> TEST POINT CNF1 is high voltage. PUY-A36NKA8 PUY-A42NKA8 CNDM Test operation – : Input of low-level sound priority mode Pump down – : Input of external contact point Manual defrost, detect history record reset, refrigerant address 21S4 Demand control setting...
  • Page 62 Outdoor power circuit board Brief Check of POWER MODULE PUZ-A24NHA8 If they are short-circuited, it means that they are broken. Measure the resistance in the following points (connectors, etc.). PUZ-A30NHA8 PUY-A24NHA8 1. Check POWER MODULE PUY-A30NHA8 Check of DIODE circuit R –...
  • Page 63 Outdoor power circuit board Brief Check of POWER MODULE PUZ-A36NKA8 If they are short-circuited, it means that they are broken. PUZ-A42NKA8 Measure the resistance in the following points (connectors, etc.). PUY-A36NKA8 1. Check POWER MODULE PUY-A42NKA8 Check of DIODE circuit R –...
  • Page 64 10-9. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS (1) Function of switches ■ The black square ( ) indicates a switch position. Type Action by the switch operation Switch Function Effective timing switch When compressor is operating Manual defrost *1 Start Normal in heating operation.
  • Page 65 Action by the switch operation Type of Effective timing Switch No. Function Switch No function — — — Power failure Auto recovery No auto recovery When power supply ON automatic recovery No function — — — No function — — —...
  • Page 66 (3) Special function Low-level noise priority mode / Demand control function (Field wiring) The low-level noise priority mode and the demand control function are available by connection of a commercially available timer or ON-OFF contactor to the CNDM connector (an optional demand control input). •...
  • Page 67 <Display function of inspection for outdoor unit> The blinking patterns of both LED1 (green) and LED2 (red) indicate the types of abnormality when it occurs. Types of abnormality can be indicated in details by connecting an optional part ‘A-Control Service Tool (PAC-SK52ST)’ to connector CNM on outdoor controller board.
  • Page 68 Indication Error Outdoor controller board Detailed Check Contents Inspection method reference code* LED (Green) LED2 (Red) page 2 blinking 4 blinking Float switch connector open (FS) Check if connector (CN4F) on indoor controller board is not disconnected. Measure resistance value among terminals on drain pump using a multimeter.
  • Page 69 Indication Error Outdoor controller board Detailed Check Contents Inspection method reference code* LED (Green) LED2 (Red) page 4 blinking 1 blinking Abnormality of room temperature thermistor (TH1) Check if connectors (CN20, CN21, CN29, and CN44) on indoor controller board are not disconnected. Abnormality of pipe temperature Measure resistance value of indoor thermistors.
  • Page 70 <Outdoor unit operation monitor function> [When optional part ‘A-Control Service Tool (PAC-SK52ST)’ is connected to outdoor controller board (CNM)] Digital indicator LED1 displays 2 digit number or code to inform operation condition and the meaning of check code by controlling DIP SW2 on ‘A-Control Service Tool’. ■...
  • Page 71 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit −58 to194 [−50 to 90˚C] Pipe temperature/Liquid (TH3) −58 to 194 (When the coil thermistor detects 0˚F [-17°C] or below, “–” and temperature are displayed by turns.) ˚F (Example) When −10˚F [-23°C];...
  • Page 72 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Operation mode on error occurring Operation mode of when operation stops due to error is displayed by setting SW2 as below. Code (SW2) display 2 3 4 5 6...
  • Page 73 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit The number of connected indoor 0 to 4 units (The number of connected indoor units are displayed.) Unit 2 3 4 5 6 Capacity setting display Displayed as an outdoor capacity code Capacity...
  • Page 74 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit 62 to 86 [17 to 30˚C] Indoor setting temperature 62 to 86 ˚F [˚C] 2 3 4 5 6 −58 to 194 [−50 to 90˚C] Outdoor pipe temperature/2-phase (When the temperature is 0˚F [-17°C] or less, “–”...
  • Page 75 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit DC bus voltage 180 to 500 180 to 500 (When it is 100V or more, hundreds digit, tens digit and ones digit are displayed by turns.) 2 3 4 5 6 Capacity save 0 to 100...
  • Page 76 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Indoor room temperature (TH1) on 46 to 102 [8 to 39°C] error occurring 46 to 102 ˚F [˚C] 2 3 4 5 6 −38 to 190 [−39 to 88°C] Indoor pipe temperature/Liquid (When the temperature is 0˚F [-17°C] or less, “–”...
  • Page 77 SW2 setting Display detail Explanation for display Unit 32 to 491 [0 to 255˚C] Discharge superheat on error (When the temperature is 100˚F [37°C] or more, occurring hundreds digit, tens digit and ones digit are ˚F 32 to 491 displayed by turns.) (Example) When 150˚F [65°C];...
  • Page 78 SW2 setting Display detail Explanation for display Unit Controlling status of compressor The following code will be a help to know the operating frequency operating status of unit. • The tens digit Display Compressor operating frequency control Primary current control Secondary current control •...

  • Page 79: Easy Maintenance Function

    EASY MAINTENANCE FUNCTION 11-1. SMOOTH MAINTENANCE Refer to "15-9. SMOOTH MAINTENANCE" for operation procedure. 11-2. GUIDE FOR OPERATION CONDITION Checkpoints Enter the temperature differences between 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"...

  • Page 80: Function Setting

    FUNCTION SETTING 12-1. UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER Each function can be set as necessary using the remote controller. The setting of function for each unit can only be done by the remote controller. Select function available from the table 1. (1) Functions available when setting the unit number to 00 (Select 00 referring to setting the indoor unit number.) <Table 1>...

  • Page 81: Monitoring The Operation Data By The Remote Controller

    MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER 13-1. HOW TO "MONITOR THE OPERATION DATA" Refer to "15-10. REQUEST CODE" when monitoring the operation data. 13-2. REQUEST CODE LIST 13-2. REQUEST CODE LIST Certain indoor/outdoor combinations do not have the request code function; therefore, no request codes are displayed. Description Request content Unit...
  • Page 82 Description Request content Unit Remarks (Display range) Indoor unit-Control state – Refer to 13-2-1.Detail Contents in Request Code. Outdoor unit-Control state – Refer to 13-2-1.Detail Contents in Request Code. Compressor-Frequency control state Refer to 13-2-1.Detail Contents in Request Code. – Outdoor unit-Fan control state Refer to 13-2-1.Detail Contents in Request Code.
  • Page 83 Description Request content Unit Remarks (Display range) Error history 1 (latest) Displays error history. (" - - " is displayed if no history is present.) Code Error history 2 (second to last) Displays error history. (" - - " is displayed if no history is present.) Code Error history 3 (third to last) Displays error history.
  • Page 84 Description Request content Unit Remarks (Display range) Indoor-Fan operating time 0–9999 1 hour (After filter is reset) Indoor-Total operating time 0–9999 10 hours (Fan motor ON time) Indoor fan output value (Sj value) 0–255 Fan control data – For indoor fan phase control Indoor fan output value "...
  • Page 85 13-2-1. Detail Contents in Request Code Example) Request code "004" Request code Discharge temperature 156°F Ref.address Request code Refrigerant address "00" Request: SELECT Cursor [Operation state] (Request code ": 0 ") Relay output state Power currently Data display Display Compressor 4-way valve Solenoid valve supplied to compressor...
  • Page 86 [Fan control state] (Request code : "53") Data display Fan step correction value by heatsink temperature overheat prevention control Fan step correction value by cool condensation temperature overheat prevention control Display Correction value - (minus) – 1 [Actuator output state] (Request code : "54") Data display Actuator output state 1 Actuator output state 2...
  • Page 87 [Contact demand capacity] (Request code : "61") Setting content Data display Setting Display Setting value Setting content SW7-1 SW7-2 100% [External input state] (Request code : "62") Input state : Input present Data display Contact demand Silent mode Spare 1 Spare 2 Display Input state...
  • Page 88 [Indoor unit – Capacity setting information] (Request code : 163) Data display Display Capacity setting state Display Capacity setting state See the table on the right. [Wireless pair No. (indoor control board side) setting] (Request code : 165) Data display Display Pair No.

  • Page 89: Disassembly Procedure

    DISASSEMBLY PROCEDURE PUZ-A12NKA8 PUZ-A18NKA8 PUY-A12NKA8 PUY-A18NKA8 : Indicates the visible parts in the photos/figures. Photos: PUZ-A12NKA8 : Indicates the invisible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES Top panel fixing screws 1. Removing the top panel, service panel, front panel,...

  • Page 90: Operating Procedure

    OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the electrical parts box Photo 5 Relay connector (1) Remove the service panel. (See Photo 2) Electrical part box Thermal protector(TRS) (2) Remove the top panel. (See Photo 1) Electrical parts box (3) Remove the front panel. (See Photo 1) fixing screw Terminal block (4) Remove the back panel.
  • Page 91 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the thermistor <Ambient> (TH7) Photo 7 Thermistor <Ambient> Electrical parts box (1) Remove the service panel. (See Photo 2) (TH7) (2) Remove the top panel. (See Photo 1) (3) Disconnect the connector TH7 (red) on the controller circuit board in the electrical parts box.
  • Page 92 OPERATING PROCEDURE PHOTOS/FIGURES 8. Removing the 4-way valve Photo 10-1: PUZ model 4-way valve (1) Remove the service panel. (See Photo 2) (2) Remove the top panel. (See Photo 1) (3) Remove the front panel. (See Photo 1) LEV coil (4) Remove the back panel.
  • Page 93 OPERATING PROCEDURE PHOTOS/FIGURES 11. Removing the high pressure switch (63H) Photo 12 (1) Remove the service panel. (See Photo 2) (2) Remove the top panel. (See Photo 1) (3) Remove the front panel. (See Photo 1) Reactor (4) Remove the back panel. (See Photo 1) fixing screw (5) Remove the electrical parts box.
  • Page 94 OPERATING PROCEDURE PHOTOS/FIGURES 14. Removing the power receiver Photo 14 (1) Remove the service panel. (See Photo 2) (2) Remove the top panel. (See Photo 1) (3) Remove the front panel. (See Photo 1) (4) Remove the back panel. (See Photo 1) (5) Remove the electrical parts box.
  • Page 95 PUZ-A24NHA8 PUZ-A30NHA8 PUY-A24NHA8 PUY-A30NHA8 Photos: PUZ-A24NHA8 : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the service panel and top panel Photo 1 Top panel fixing screws (1) Remove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service Top panel panel.
  • Page 96 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the thermistor <Liquid> (TH3) and thermistor Photo 5 Thermistor Electrical parts box <2-phase pipe> <2-phase pipe> (TH6) Controller (TH6) (1) Remove the service panel. (See Photo 1) circuit board Thermistor (2) Remove the top panel. (See Photo 1) (C.B.) <Ambient>...
  • Page 97 OPERATING PROCEDURE PHOTOS/FIGURES 8. Removing the 4-way valve coil (21S4), LEV coil (LEV(A), Photo 8 4-way valve coil 4-way valve LEV(B)) fixing screw (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 4) [Removing the 4-way valve coil] (4) Remove 4-way valve coil fixing screw (M4 ×...
  • Page 98 OPERATING PROCEDURE PHOTOS/FIGURES 11. Removing the LEV ASSY-B (fusible plug) Figure 2 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 4) (4) Remove 3 valve bed fixing screws (4 × 10) and 4 ball valve and stop valve fixing screws (5 ×...
  • Page 99 OPERATING PROCEDURE PHOTOS/FIGURES 14. Removing the compressor (MC) Photo 11 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove 2 front cover panel fixing screws (5 × 12) and remove the front cover panel. (See Photo 1) (4) Remove 2 back cover panel fixing screws (5 ×...
  • Page 100 PUZ-A36NKA8 PUZ-A42NKA8 PUY-A36NKA8 PUY-A42NKA8 : Indicates the visible parts in the photos/figures. PHOTO: PUZ-A36NKA8 : Indicates the invisible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the service panel, top panel, ice guard, and Photo 1 Top panel fixing screws Top panel propeller (1) Remove 3 service panel fixing screws (5 ×...
  • Page 101 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the thermistor <2-phase pipe> (TH6) Photo 5 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Disconnect the connectors, TH6 and TH7 (red), on the Clamp Electrical controller circuit board in the electrical parts box.
  • Page 102 OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the 4-way valve coil (21S4) and linear expan- Photo 8-1: PUZ model sion valve coil (LEV-A, B) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) [Removing the 4-way valve coil] 4-way valve (3) Remove 4-way valve coil fixing screw (M4 ×...
  • Page 103 OPERATING PROCEDURE PHOTOS/FIGURES 10. Removing the high pressure switch (63H) Photo 9-1: PUZ model (1) Remove the service panel. (See photo 1) (2) Remove the top panel. (See photo 1) (3) Remove 3 right side panel fixing screws (5 × 12) in the rear of the unit and remove the right side panel.
  • Page 104 OPERATING PROCEDURE PHOTOS/FIGURES 12. Removing the compressor (MC) Photo 11 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) Fusible (3) Remove 1 front cover panel fixing screws (5 × 12) and plug remove the front cover panel.

  • Page 105: Remote Controller

    REMOTE CONTROLLER 15-1. REMOTE CONTROLLER FUNCTIONS <PAR-41MAA> Controller interface The functions of the function buttons change depending on the screen. Refer to the button function guide that appears at the bottom of the LCD for the functions they serve on a given screen. When the system is centrally controlled, the button function guide that corresponds to the locked button will not appear.
  • Page 106 Display The main display can be displayed in two different modes: “Full” and “Basic”. The initial setting is “Full”. To switch to the “Basic” mode, change the setting on the Main display setting. (Refer to operation manual included with remote controller.) <Full mode>...
  • Page 107 Menu structure Press the button. Main menu MENU Move the cursor to the desired item with the buttons, and press the SELECT button. Operation Vane · Louver · Vent. (Lossnay) High power Comfort Manual vane angle 3D i-see Sensor Timer menu Timer ON/OFF timer Auto-OFF timer...
  • Page 108 Continue from the previous page. Maintenance menu Error information Filter information Cleaning Auto descending panel Descending operation Descending adjustment Service menu Test run menu Test run Drain pump test run Maintenance information Model name input Serial No. input Dealer information input Initialize maintenance info.

  • Page 109: Main Menu List

    Main menu list Main Setting and display items Setting details menu Operation Vane · Louver · Vent. Use to set the vane angle. (Lossnay) • Select a desired vane setting. Use to turn ON/OFF the louver. • Select a desired setting from "ON" and "OFF." Use to set the amount of ventilation.
  • Page 110 Setting and display Main menu Setting details items Initial Display Main display Use to switch between "Full" and "Basic" modes for the Main display, and use setting setting to change the background colors of the display to black. Display de- Make the settings for the remote controller related items as necessary.

  • Page 111: Controller Interface

    <PAR-FL32MA> Controller interface Transmission area Transmission indicator Remote controller display Timer indicator *For explanation purposes, all of the items that appear in the display are shown. *All items are displayed when the Reset button is pressed. Operation areas ON/OFF button Temperature setting buttons Fan Speed button (Changes fan speed) Timer Off button...
  • Page 112 <PAR-SL101A-E> Controller interface Transmission area Remote controller display Set Temperature buttons OFF/ON button Mode button (Changes operation mode) Fan Speed button (Changes fan speed) Airflow button (Changes up/ down airflow direction) i-see button* Timer ON button Menu button Timer OFF button SET/SEND button Weekly timer ON/OFF button* CANCEL button...

  • Page 113: Error Information

    15-2. ERROR INFORMATION When an error occurs, the following screen will appear. Check the error status, stop the operation, and consult your dealer. 1. Check code, error unit, refrigerant address, model name, and se- Error information rial number will appear. Error code The model name and serial number will appear only if the informa- Error unit...
  • Page 114 • Checking the error information Maintenance menu While no errors are occurring, page 2/2 of the error information can be Error information viewed by selecting "Error information" from the Maintenance menu. Filter information Cleaning Errors cannot be reset from this screen. Main menu: RETURN Cursor SELECT...

  • Page 115: Service Menu

    15-3. SERVICE MENU Maintenance password is required 1. Select "Service" from the Main menu, and press the [SELECT] button. Main Main menu *At the main display, the menu button and select "Service" to make the Service maintenance setting. 2. When the Service menu is selected, a window will appear asking for the pass- Service menu word.

  • Page 116: Test Run Operation

    15-4. TEST RUN 15-4-1. PAR-41MAA 1. Select "Service" from the Main menu, and press the [SELECT] button. Test run Input maintenance info. Settings Check Select "Test run" with the F1 or F2 button, and press the [SELECT] button. Others : RETURN SELECT MENU RETURN...
  • Page 117 15-4-2. PAR-FL32MA Measure an impedance between the power supply terminal block on the outdoor unit and ground with a 500 V Megger and check that it is equal to or greater than 1.0 MΩ. TEST RUN Turn on the main power to the unit. TEST RUN Press the button twice continuously.
  • Page 118 15-5. FUNCTION SETTING 15-5-1. PAR-41MAA Settings menu Function setting 1. Select "Service" from the Main menu, and press the [SELECT] button. Select "Setting" from the Service menu, and press the [SELECT] button. Service menu: MENU Select "Function setting", and press the [SELECT] button. SELECT MENU RETURN...
  • Page 119 15-5-2. PAR-FL32MA Functions can be selected with the wireless remote controller. Function selection using wireless remote controller is available only for refriger- ant system with wireless function. Refrigerant address cannot be specified by the wireless remote controller. [Flow of function selection procedure] Flow of function selection procedure The flow of the function selection procedure is shown below.
  • Page 120 15-5-3. PAR-SL101A-E 1. Going to the function select mode Press the button between of 5 seconds. (Start this operation from the status of remote controller display turned off.) [CHECK] is lit and "00" blinks. (Fig. 1) Press the button to set the "50". Direct the wireless remote controller toward the receiver of the indoor unit and press the button.

  • Page 121: Error History

    15-6. ERROR HISTORY 1. Select "Service" from the Main menu, and press the [SELECT] button. Test run Input maintenance info. Settings Check Select "Check" with the F1 or F2 button, and press the Others : RETURN [SELECT] button. SELECT MENU RETURN HOLD 2.

  • Page 122: Self-Diagnosis

    15-7. SELF-DIAGNOSIS 15-7-1. PAR-41MAA 1. Select "Service" from the Main menu, Diagnosis and press the [SELECT] button. Self check Remote controller check Select "Check" from the Service menu, and press the [SELECT] button. Service menu: MENU Cursor Select "Diagnosis" from the Check menu, and press the [SELECT] button.
  • Page 123 15-7-2. PAR-FL32MA When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop. < Malfunction-diagnosis method at maintenance service> Refrigerant [Procedure] address display 1. Press the CHECK button twice. CHECK CHECK •...

  • Page 124: Remote Controller Check

    15-8. REMOTE CONTROLLER CHECK If operations cannot be completed with the remote controller, diagnose the remote controller with this function. 1. Select "Service" from the Main menu, and Diagnosis press the [SELECT] button. Self check Remote controller check Select "Check" from the Service menu, and press the [SELECT] button.
  • Page 125 15-9. SMOOTH MAINTENANCE Check menu 1. Select "Service" from the Main menu, and press the [SELECT] button. Error history Diagnosis Smooth maintenance Request code Select "Check" with the F1 or F2 button, and press the [SELECT] button. Service menu: MENU Cursor Select "Smooth maintenance"...

  • Page 126: Request Code

    ■ Refrigerant address Single refrigerant system Multi refrigerant system (group control) In the case of single refrigerant system, the refrigerant address Up to 16 refrigerant systems (16 outdoor units) can be con- is "00" and no operation is required. nected as a group by 1 remote controller. To check or set the Simultaneous twin, triple units belong to this category refrigerant addresses.
  • Page 127 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN ©Copyright 2023 MITSUBISHI ELECTRIC CORPORATION Issued: Oct. 2024 No. OCH764B Issued: Dec. 2023 No. OCH764A Published: Oct. 2023 No. OCH764 Made in Japan Specifications are subject to change without notice.

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