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Mitsubishi Electric PUZ-A18NHA4 Service Manual

Split-type, heat pump air conditioners outdoor unit.
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS

Outdoor unit

SERVICE MANUAL

[Model names]

PUZ-A18NHA4
PUZ-A24NHA4
PUZ-A30NHA4
PUZ-A36NHA4
PUZ-A42NHA4
PUZ-A18NHA4-BS
PUZ-A24NHA4-BS
PUZ-A30NHA4-BS
PUZ-A36NHA4-BS
PUZ-A42NHA4-BS
PUY-A12NHA4
PUY-A18NHA4
PUY-A24NHA4
PUY-A30NHA4
PUY-A36NHA4
PUY-A42NHA4
PUY-A12NHA4-BS
PUY-A18NHA4-BS
PUY-A24NHA4-BS
PUY-A30NHA4-BS
PUY-A36NHA4-BS
PUY-A42NHA4-BS
[Service Ref.]
PUZ-A18NHA4
PUZ-A24NHA4
PUZ-A30NHA4
PUZ-A36NHA4
PUZ-A42NHA4
PUZ-A18NHA4-BS
PUZ-A24NHA4-BS
PUZ-A30NHA4-BS
PUZ-A36NHA4-BS
PUZ-A42NHA4-BS
PUY-A12NHA4
PUY-A18NHA4
PUY-A24NHA4
PUY-A30NHA4
PUY-A36NHA4
PUY-A42NHA4
PUY-A12NHA4-BS
PUY-A18NHA4-BS
PUY-A24NHA4-BS
PUY-A30NHA4-BS
PUY-A36NHA4-BS
PUY-A42NHA4-BS
PUZ-A24/30/36NHA4
PUY-A24/30/36NHA4
R410A
CONTENTS
1. REFERENCE MANUAL ································· 2
2. SAFETY PRECAUTION ································· 3
3. FEATURES ····················································· 6
4. SPECIFICATIONS ·········································· 7
5. DATA ······························································· 9
6. OUTLINES AND DIMENSIONS ··················· 13
7. WIRING DIAGRAM ······································ 16
8. WIRING SPECIFICATIONS ·························· 20
9. REFRIGERANT SYSTEM DIAGRAM ············· 25
10. TROUBLESHOOTING ·································· 28
11. EASY MAINTENANCE FUNCTION·············· 85
12. FUNCTION SETTING ··································· 88
14. DISASSEMBLY PROCEDURE ··················· 106
PARTS CATALOG (OCB481)
November 2010
No.OCH481
NOTE:
• This manual describes only
service data of the outdoor
units.
• RoHS compliant products
have mark on the spec
name plate.

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Table of Contents

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   Summary of Contents for Mitsubishi Electric PUZ-A18NHA4

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS Outdoor unit November 2010 No.OCH481 SERVICE MANUAL R410A [Model names] [Service Ref.] PUZ-A18NHA4 PUZ-A18NHA4 NOTE: PUZ-A24NHA4 PUZ-A24NHA4 • This manual describes only PUZ-A30NHA4 PUZ-A30NHA4 service data of the outdoor units. PUZ-A36NHA4 PUZ-A36NHA4 •...
  • Page 2: Reference Manual

    REFERENCE MANUAL 1-1. INDOOR UNIT Model name Service Ref. Service manual No. PLA-A12/18/24/30/36/42BA4 PLA-A12/18/24/30/36/42BA4 OCH482 OCB482 PCA-A24/30/36/42KA4 PCA-A24/30/36/42KA4 OCH484 OCB484 PKA-A12/18HA4 PKA-A12/18HA4 OCH483 OCB483 PKA-A24/30/36KA4 PKA-A24/30/36KA4.TH OCH488 OCB488 PEA-A12/18AA4 PEA-A12/18AA4.TH HWE0807B PEAD-A24/30/36/42AA4 PEAD-A24/30/36/42AA4.TH HWE0905A...
  • Page 3: Safety Precaution

    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 If other refrigerant (R22 etc.) is used, chlorine in refrige- the followings.
  • Page 4 [1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) When performing service, install a filter drier simultaneously. Be sure to use a filter drier for new refrigerant.
  • 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: Features

    FEATURES PUZ-A18NHA4 PUZ-A24/30/36NHA4 PUZ-A18NHA4-BS PUZ-A24/30/36NHA4-BS PUY-A12/18NHA4 PUY-A24/30/36NHA4 PUY-A12/18NHA4-BS PUY-A24/30/36NHA4-BS PUZ-A42NHA4 PUZ-A42NHA4-BS PUY-A42NHA4 PUY-A42NHA4-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.
  • Page 7: Specifications

    SPECIFICATIONS Service Ref. PUZ-A18NHA4 PUZ-A24NHA4 PUZ-A30NHA4 PUZ-A36NHA4 PUZ-A42NHA4 PUZ-A18NHA4-BS PUZ-A24NHA4-BS PUZ-A30NHA4-BS PUZ-A36NHA4-BS PUZ-A42NHA4-BS Power supply Phase Single Cycle 60Hz Voltage 208/230V MOCP Breaker size External finish Munsell 3Y 7.8/1.1 Heat exchanger Plate fin coil Defrost method Reverse cycle Crankcase heater...
  • Page 8 Service Ref. PUY-A12NHA4 PUY-A18NHA4 PUY-A24NHA4 PUY-A30NHA4 PUY-A36NHA4 PUY-A42NHA4 PUY-A12NHA4-BS PUY-A18NHA4-BS PUY-A24NHA4-BS PUY-A30NHA4-BS PUY-A36NHA4-BS PUY-A42NHA4-BS Power supply Phase Single Cycle 60Hz Voltage 208/230V MOCP Breaker size External finish Munsell 3Y 7.8/1.1 Heat exchanger Plate fin coil Defrost method Crankcase heater Compressor Hermetic Model SNB130FQCM1...
  • Page 9: Data

    52 oz 46 oz PUY-A12NHA4 PUY-A12NHA4-BS 1.2 kg 1.2 kg 1.3 kg 1.4 kg 1.4 kg 1.5 kg 1.3 kg PUZ-A18NHA4 56 oz 58 oz 60 oz 62 oz 64 oz 66 oz 60 oz PUZ-A18NHA4-BS PUY-A18NHA4 PUY-A18NHA4-BS 1.6 kg 1.6 kg...
  • Page 10 5-3. NOISE CRITERION CURVES PUY-A18NHA4 PUY-A12NHA4 PUY-A18NHA4-BS PUY-A12NHA4-BS SPL(dB) MODE SPL(dB) LINE MODE LINE PUZ-A18NHA4 COOLING COOLING PUZ-A18NHA4-BS 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 HEARING FOR NC-20...
  • Page 11: Standard Operation Data

    60Hz 60Hz 60Hz 60Hz 60Hz Voltage 230V 230V 230V 230V 230V Current 0.33A 0.36A 0.36A 0.57A 1.00A 0.94A Outdoor unit model PUZ-A18NHA4 PUZ-A24NHA4 PUZ-A30NHA4 PUZ-A36NHA4 PUZ-A42NHA4 Phase Single Single Single Single Single Cycle 60Hz 60Hz 60Hz 60Hz 60Hz Voltage 230V...
  • Page 12: Cooling Only

    5-4-2. Cooling only Representative matching PKA-A12HA4 PKA-A18HA4 PKA-A24KA4 PKA-A30KA4 PKA-A36KA4 PLA-A42BA4 Mode COOLING COOLING COOLING COOLING COOLING COOLING 12 , 000 18 , 000 24 , 000 30 , 000 34 , 200 42 , 000 Total Capacity BTU/h Input 4 , 600 1,190 2,240...
  • Page 13: Outlines And Dimensions

    OUTLINES AND DIMENSIONS OUTDOOR UNIT Unit: mm<inch> PUZ-A18NHA4 PUZ-A18NHA4-BS PUY-A12/18NHA4 PUY-A12/18NHA4-BS 400<15-25/32> 347.5<13-11/16> 33<1-5/16> drain hole Air intake Air intake 45.4<1-25/32> Air discharge 4-oval hole 40<1-9/16> Service panel 18<23/32> 23<29/32> 22<7/8> Service panel for charge plug 2- 22.2<7/8> 1/2 conduit hole...
  • Page 14 PUZ-A24/30/36NHA4 PUZ-A24/30/36NHA4-BS Unit: mm<inch> PUY-A24/30/36NHA4 PUY-A24/30/36NHA4-BS...
  • Page 15 PUZ-A42NHA4 PUZ-A42NHA4-BS Unit: mm<inch> PUY-A42NHA4 PUY-A42NHA4-BS...
  • Page 16: Wiring Diagram

    WIRING DIAGRAM PUZ-A18NHA4 PUZ-A18NHA4-BS PUY-A12/18NHA4 PUY-A12/18NHA4-BS [LEGEND] SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block<Power Supply, Indoor/Outdoor> Converter Switch Motor for Compressor Power Module LED1,LED2 LED<Operation Inspection Indicators> Fan Motor CB1~CB3 Main Smoothing Capacitor F1~F4 Fuse<T6.3AL250V> N.F. Noise Filter Circuit Board...
  • Page 17 PUZ-A24NHA4 PUZ-A24NHA4-BS PUY-A24NHA4 PUY-A24NHA4-BS [LEGEND] SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block<Power Supply, Indoor/Outdoor> LED1,LED2 LED<Operation Inspection Indicators> Converter Motor for Compressor Power Module F1~F4 Fuse<T6.3AL250V> Fan Motor CB1~CB3 Main Smoothing Capacitor Switch<Pump Down> Noise Filter Circuit Board 21S4 Solenoid Valve (Four-Way Valve) N.F.
  • Page 18 PUZ-A30/36NHA4 PUZ-A30/36NHA4-BS PUY-A30/36NHA4 PUY-A30/36NHA4-BS [LEGEND] SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block<Power Supply, Indoor/Outdoor> P.B. Power Circuit Board Switch<Test Operation> Motor for Compressor TABU/V/W Connection Terminal<U/V/W-Phase> Switch<Function Switch> Fan Motor TABS/T Connection Terminal<L1/L2-Phase> Switch<Model Select> 21S4 Solenoid Valve (Four-Way Valve) Switch<Function Setup>...
  • Page 19 PUZ-A42NHA4 PUZ-A42NHA4-BS PUY-A42NHA4 PUY-A42NHA4-BS [LEGEND] SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block<Power Supply, Indoor/Outdoor > P.B. Power Circuit Board Switch<Test Operation> Motor for Compressor TABU/V/W Connection Terminal<U/V/W-Phase> Switch<Function Switch> MF1,MF2 Fan Motor TABS/T Connection Terminal<L1/L2-Phase> Switch<Model Select> 21S4 Solenoid Valve (Four-Way Valve) TABP1/P2/P Connection Terminal<DC Voltage>...
  • Page 20: 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 Simultaneous twin system Outdoor unit power supply Wiring circuit breaker or isolating switch Outdoor unit Indoor unit/outdoor unit connecting cords Remote controller...
  • Page 21: Separate Indoor Unit/outdoor Unit Power Supplies

    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. Outdoor unit power supply Wiring circuit breaker or isolating switch Outdoor unit Indoor unit/outdoor unit connecting cords Remote controller...
  • Page 22 8-3. INDOOR - OUTDOOR CONNECTING CABLE Wire No. Size Outdoor power supply Max. 45m, 147ft Max. 50m, 164ft Max. 80m, 262ft Indoor unit-Outdoor unit AWG15(polar) AWG13(polar) AWG13(polar) and S3 separated The max. cable length may vary depending on the condition of installation, humidity or materials, etc. Wire No.
  • Page 23: M-net Wiring Method

    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 5 cm. Do not put them in the same conduit tube.
  • Page 24 ● M-NET wiring (1) Use 2-core × 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.
  • Page 25: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PUZ-A18NHA4(-BS) Unit: mm (inch) <4-way valve solenoid coil> Service Heating : ON High pressure Stop valve protect switch port(check) (with service port) Cooling : OFF 4-way valve Outdoor heat exchanger (#50) Refrigerant GAS pipe Strainer Thermistor 12.7 ( 1/2)
  • Page 26 PUY-A12NHA4(-BS) PUY-A18NHA4(-BS) Unit: mm (inch) Service port Stop valve High pressure (Check) (with service port) protect switch Outdoor heat exchanger (#50) Thermistor Strainer Refrigerant GAS pipe (TH6) 12.7 ( 1/2) Thermistor (TH3) Thermistor (TH32) Distributor Accumulator Refrigerant flow in cooling Compressor (#100) (#100)
  • Page 27 1. Refrigerant recovering (pump down) Perform the following procedures to recover the refrigerant when moving the indoor unit or the outdoor unit. 1 Turn 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”...
  • Page 28: Troubleshooting

    TROUBLESHOOTING 10-1. TROUBLESHOOTING <Error code display by self-diagnosis and actions to be taken for service (summary)> Present and past error codes are logged and displayed on the wired remote controller and control board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring at service, are summarized in the table below.
  • Page 29 Operating procedures While the room temperature display on the remote "TEST RUN" and the currently selected controller is “PLEASE WAIT”, the remote controller is disabled. operation mode are displayed alternately. Wait until “PLEASE WAIT” disappears before using remote controller. 1. Turn on the main power supply. “PLEASE WAIT”...
  • Page 30 Test run [for wireless remote controller] Measure an impedance between the power supply terminal block on the outdoor unit and ground with a 500V Megger and check that it is equal to or greater than 1.0M". TEST COOL 1 Turn on the main power to the unit. 2 Press the TEST RUN button twice continuously.
  • Page 31: How To Proceed "self-diagnosis

    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.
  • Page 32 When the error history is reset, the display will look like the one shown below. Press the button twice within 3 seconds. The self-diagnosis ON/OFF However, if you fail to reset the error history, the error content will be displayed again. address or refrigerant address will blink.
  • Page 33: Ground

    10-3-4. Malfunction-diagnosis method by wireless remote controller <In case of trouble during operation> When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop. < Malfunction-diagnosis method at maintenance service> [Procedure] 1.
  • Page 34 • Refer to the following tables for details on the check codes. [Output pattern A] Beeper sounds Beep Beep Beep Beep Beep Beep Beep OPERATION · · · Repeated INDICATOR lamp blink pattern Approx. 2.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.
  • Page 35: Self-diagnosis Action Table

    10-4. SELF-DIAGNOSIS ACTION TABLE <Abnormalities detected when the power is turned on> (Note 1) Refer to indoor unit section for code P and code E. Abnormal point and detection method Case Judgment and action Error Code 1 No voltage is supplied to terminal 1 Check following items.
  • Page 36 Abnormal point and detection method Case Judgment and action Error Code 63H connector open 1 Disconnection or contact failure 1 Check connection of 63H connector on Abnormal if 63H connector circuit is open for of 63H connector on outdoor outdoor controller circuit board. 3 minutes continuously after power supply.
  • Page 37 <Abnormalities detected while unit is operating> Abnormal point and detection method Judgment and action Error Code Case High pressure (High-pressure switch 1 Short cycle of indoor unit 1~6 Check indoor unit and repair the defect. 63H operated) 2 Clogged filter of indoor unit Abnormal if high-pressure switch 63H oper- 3 Decreased airflow caused by ated ( w ) during compressor operation.
  • Page 38 Abnormal point and detection method Judgment and action Case Error Code Open/short circuit of discharge 1 Disconnection or contact 1 Check connection of connector (TH4/TH32) temperature thermistor (TH4)/ on the outdoor controller circuit board. failure of connector (TH4/TH32) Check breaking of the lead wire for comp.shell thermistor (TH32) on the outdoor controller circuit thermistor (TH4/TH32).
  • Page 39 Abnormal point and detection method Judgment and action Error Code Case Outdoor fan motor 1 Failure in the operation of the 1 Check or replace the DC fan motor. Abnormal if the rotational frequency of fan DC fan motor motor is not detected during DC fan motor 2 Failure in the outdoor circuit 2 Check the voltage of the outdoor circuit con- operation.
  • Page 40 Abnormal point and detection method Judgment and action Error Code Case Compressor overcurrent interruption 1 Stop valve of outdoor unit is 1 Open stop valve. Abnormal if overcurrent DC bus or com- closed. 2 Check facility of power supply. pressor is detected after compressor starts 2 Decrease of power supply volt- 3 Correct the wiring (U·V·W phase) to operating for 30 seconds.
  • Page 41 Abnormal point and detection method Judgment and action Error Code Case w Check LED display on outdoor controller Indoor/outdoor unit communication error (Signal receiving error) circuit board. (Connect A-Control service tool 1 Abnormal if indoor controller board could (PAC-SG50ST)) 1 Contact failure, short circuit or not receive any signal normally for 6 Refer to EA~EC item if LED displays EA~AC.
  • Page 42 Abnormal point and detection method Judgment and action Error Code Case Pipe temperature 1 Slight temperature difference Check pipe <liquid or condenser/ <Cooling mode> between indoor room evaporator> temperature with room Detected as abnormal when the pipe tem- temperature and pipe <liquid temperature display on remote perature is not in the cooling range 3 min- or condenser/evaporator>...
  • Page 43: Continuous

    Error Code Abnormal point and detection method Case Judgment and action Communication error with communica- 1 Data of transmission proces- Turn off the power supply of outdoor unit and sor or unit processor is not indoor unit and FRESH MASTER or LOSSNAY tion processor at the same time for 2 minutes or more, and transmitted normally because...
  • Page 44 From the previous page. Error Code Abnormal point and detection method Case Judgment and action 4. If displayed address or attribute is 1 During group operation with Same as mentioned in “A7” of the previous indoor unit of multi- refrigerant page.
  • Page 45: Continuous

    Error Code Abnormal point and detection method Case Judgment and action M-NET NO RESPONSE 1 Transmitting condition is 1 Check transmission waveform or noise on repeated fault because of Abnormal if a message was transmitted transmission wire. noise and the like. and there were reply (ACK) that message 2 Turn off the power supply of outdoor unit 2 Extension of transmission wire...
  • Page 46: Cooling

    Phenomena Factor Countermeasure 4. Even controlling by the wireless 1The pair number settings of the wireless remote 1Check the pair number settings. remote controller no beep is heard controller and indoor controller board are mismatched. and the unit does not start operat- ing.
  • Page 47 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 48: Symptoms: Nothing Is Displayed On The Remote Controller

    LED display of the indoor controller board LED1 : Symptoms: Nothing is displayed on the remote controller 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. AC 187V to AC 253V? Check the voltage among L1 and L2 on the terminal block (TB1) of the...
  • Page 49: Noise

    LED display of the indoor controller board LED1 : Symptoms: Nothing is displayed on the remote controller 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.
  • Page 50 LED display of the indoor controller board LED1 : Symptoms: Nothing is displayed on the remote controller LED2 : LED3 : — Inspection method and Diagnosis flow Cause troubleshooting Check the voltage of the terminal block (TB6) of the remote controller. DC 10V to DC 16V? •...
  • Page 51 • Before repair Frequent calling from customers Phone Calls From Customers How to Respond Note Unit does The operating display of remote Check if power is supplied to air conditioner. not operate controller does not come on. Nothing appears on the display unless power is at all.
  • Page 52 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 53 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 54: Cooling

    Phone Calls From Customers How to Respond Note A white mist is expelled from the indoor unit. This is not a malfunction. This may occur when the operation gets started in the room of high humidity. Water or moisture is expelled from the outdoor Cooling: when pipes or piping joints are cooled, they unt.
  • Page 55 10-6. HOW TO CHECK THE PARTS PUZ-A18/24/30/36/42NHA4 PUZ-A18/24/30/36/42NHA4-BS PUY-A12/18/24/30/36/42NHA4 PUY-A12/18/24/30/36/42NHA4-BS Parts name Check points Thermistor (TH3) Disconnect the connector then measure the resistance with a tester. <Outdoor pipe> (At the ambient temperature 10 ~30 , 50°F~86°F) Thermistor (TH4) Normal Abnormal <Discharge>...
  • Page 56 Check method of DC fan motor (fan motor / outdoor controller circuit board) Notes · High voltage is applied to the connecter (CNF1, 2) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNF1, 2) for the motor with the power supply on. (It causes trouble of the outdoor controller circuit board and fan motor.) Self check...
  • Page 57 10-7. HOW TO CHECK THE COMPONENTS <Thermistor feature chart> Low temperature thermistors • Thermistor <Outdoor pipe> (TH3) • Thermistor <Outdoor 2-phase pipe> (TH6) • Thermistor <Outdoor> (TH7) Thermistor R0 = 15k" ± 3% B constant = 3480 ± 2% =15exp{3480( 273+t – 273 )} t (:): R =15exp{3480( 273+(T–...
  • Page 58 Linear expansion valve (A12, 18) (1) Operation summary of the linear expansion valve • Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board. • Valve position can be changed in proportion to the number of pulse signal. <Connection between the outdoor controller board and the linear expansion valve>...
  • Page 59 Linear expansion valve (A24, 30, 36, 42) (1) Operation summary of the linear expansion valve • Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board. • Valve position can be changed in proportion to the number of pulse signal. <Connection between the outdoor controller board and the linear expansion valve>...
  • Page 60 (3) How to attach and detach the coil of linear expansion valve (A12, 18 ) <Composition> Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Main body Coil Lead wire Stopper <How to detach the coil>...
  • Page 61 (4) How to attach and detach the coil of linear expansion valve (A24, 30, 36, 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>...
  • Page 62: Continuous

    10-8. EMERGENCY OPERATION (1) When the error 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 63 (5) Operation data during emergency operation During emergency operation, no communication is performed with the indoor unit, so the data items needed for operation are set to the following values: Operation mode Operation data Remarks COOL HEAT Intake temperature (TH1) 27:, 81°F 20.5:, 69°F Indoor fl...
  • Page 64: Noise

    10-9. TEST POINT DIAGRAM <CAUTION> TEST POINT1 is high voltage. Outdoor controller circuit board PUZ-A18/24/30/36/42NHA4 PUZ-A18/24/30/36/42NHA4-BS PUY-A12/18/24/30/36/42NHA4 PUY-A12/18/24/30/36/42NHA4-BS CN51 Demand control setting Forced defrost, detect history record reset, refrigerant address External signal output • Compressor operating signal Model select • Abnormal signal CNDM Test operation 1 to 2:...
  • Page 65: Noise

    Outdoor noise filter circuit board PUZ-A18NHA4 PUZ-A18NHA4-BS PUY-A12/18NHA4 PUY-A12/18NHA4-BS LI, NI Voltage of 208/230V AC is input. Connect to the earth (Connect to the terminal block (TB1)) Connect to the earth Connect to the earth CNAC1, CNAC2 208/230V AC (Connect to the...
  • Page 66: Noise

    Outdoor noise filter circuit board PUZ-A24NHA4 PUZ-A24NHA4-BS PUY-A24NHA4 PUY-A24NHA4-BS EI, E2 Connect to the earth CNAC1, CNAC2 Connect to 208/230V AC the earth (Connect to the outdoor control- ler circuit board (CNAC)) Primary current (Connect to the outdoor power circuit board (CN5)) CN52C 52C relay signal...
  • Page 67: Noise

    Outdoor noise filter circuit board PUZ-A30/36/42NHA4 PUZ-A30/36/42NHA4-BS PUY-A30/36/42NHA4 PUY-A30/36/42NHA4-BS CN52C 52C driving signal (Connect to the outdoor controller circuit board (CN52C)) 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 control-...
  • Page 68: Noise

    Brief check of DIP-IPM and DIP-PFC Outdoor power circuit board W Usually, they are in a state of being short-circuited if they are broken. PUZ-A18NHA4 Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken.
  • Page 69: Noise

    Outdoor power circuit board Brief check of POWER MODULE W Usually, they are in a state of being short-circuited if they are broken. PUZ-A30/36/42NHA4 Measure the resistance in the following points (connectors, etc.). PUZ-A30/36/42NHA4-BS If they are short-circuited, it means that they are broken. 1.
  • Page 70 Active filter module PUZ-A30/36/42NHA4 PUZ-A30/36/42NHA4-BS PUY-A30/36/42NHA4 PUY-A30/36/42NHA4-BS Connect to the outdoor power circuit board (TABP2) L1, L2 Connect to the DCL (Reactor) Non-connect Lower side Upper side Non-connect Connect to the outdoor power circuit board (TABP1) Connect to the outdoor power circuit board (CNAF) –...
  • Page 71: Cooling

    10-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS (1) Function of switches ■ The black square ( ) indicates a switch position. Type Action by the switch operation Function Effective timing Switch switch When compressor is operating Forced defrost 1 Start Normal in heating operation.
  • Page 72 No function — — — MODEL SW5-5.6 MODEL SW5-5.6 PUZ-A18NHA4 PUY-A12NHA4 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6 PUZ-A24NHA4 PUY-A18NHA4 1 2 3 4 5 6...
  • Page 73 Special function (a) Low-level sound priority mode (Local wiring) Unit enters into Low-level sound priority mode by external signal input setting. Inputting external signals to the outdoor unit decreases the outdoor unit operation sound 3 to 4 dB lower than that of usual. 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.
  • Page 74 <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 75 Indication Error Outdoor controller board Error Detailed Contents Inspection method code reference LED1 (Green) LED2 (Red) page 3 blinking 1 blinking Check if stop valves are open. P.37 Abnormality of shell thermistor (TH32) Check if connectors (TH4, TH32, LEV-A) on outdoor controller board are not and discharging temperature (TH4) disconnected.
  • Page 76 <Outdoor unit operation monitor function> [When option part ‘A-Control Service Tool (PAC-SK52ST)’ is connected to outdoor controller board (CNM)] Digital indicator LED1 displays 2 digit number or code to inform operation condition and the meaning of error code by controlling DIP SW2 on ‘A-Control Service Tool’. ■...
  • Page 77 ■ The black square ( ) indicates a switch position. Explanation for display Unit SW2 setting Display detail Pipe temperature / Liquid(TH3) – 40~194 (– 40~90:) – 40~194 (When the coil thermistor detects 0˚F or below, “–” and temperature are displayed by turns.) ˚F (Example) When -10˚F;...
  • Page 78 ■ The black square ( ) indicates a switch position. Explanation for display Unit SW2 setting Display detail Pipe temperature/Liquid (TH3) on error – 40~194 (– 40~90:) occurring (When the coil thermistor detects 0˚F or below, “–” – 40~194 and temperature are displayed by turns.) ˚F (Example) When –15˚F;...
  • Page 79 ■ The black square ( ) indicates a switch position. Explanation for display SW2 setting Display detail Unit The number of connected indoor units (The number of connected indoor units are dis- played.) Unit 2 3 4 5 6 Capacity setting display Displayed as an outdoor capacity code Capacity Code...
  • Page 80 ■ The black square ( ) indicates a switch position. Explanation for display Unit SW2 setting Display detail Indoor setting temperature 62~86 (17~30:) 62~86 ˚F 2 3 4 5 6 Outdoor pipe temperature / 2-phase -38~190 (-39~88:) pipe (TH6) (When the temperature is 0˚F or less, “–” and -38~190 temperature are displayed by turns.) ˚F...
  • Page 81 ■ The black square ( ) indicates a switch position. Explanation for display Unit SW2 setting Display detail 0~100 Capacity save (When the capacity is 100%, hundreds digit, tens 0~100 digit and ones digit are displayed by turns.) When air conditioner is connected to (Example) When 100%;...
  • Page 82 ■ The black square ( ) indicates a switch position. Explanation for display Unit SW2 setting Display detail 0~480 LEV-A opening pulse on error occurring (When it is 100 pulse or more, hundreds digit, tens 0~480 digit and ones digit are displayed by turns.) (Example) When 130 pulse;...
  • Page 83 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0~327 (0~182degC) Discharge superheat on error occurring (When the temperature is 100degF or more, 0~327 hundreds digit, tens digit and ones digit are displayed by turns.) degF (Example) When 150degF;...
  • Page 84 ■ The black square ( ) indicates a switch position. Explanation for display Unit SW2 setting Display detail 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 85: Easy Maintenance Function

    EASY MAINTENANCE FUNCTION Reduces maintenance work drastically. Enables you to check operation data of the indoor and outdoor units by remote controller. Furthermore, use of maintenance stable-operation control that fixes the operating frequency, allows smooth inspection, even for inverter models. Smooth Mainte- Discharge temperature 147 °F Conventional inspection work...
  • Page 86 Data measurement When the operation is stabilized, measure operation data as explained below. (4) Press the [TEMP] buttons ( ) to select the desired refrigerant address. [Screen (5) Select the type of data to be displayed. After selecting, go to step (6). Compressor information button MENU...
  • Page 87 11-2.GUIDE FOR OPERATION CONDITION Check Points Inspection item Result Breaker Good Retightened Enter the temperature differences between into Terminal block Outdoor Unit Good Retightened the graph given below. Indoor Unit Good Retightened Operation state is determined according to the plotted areas on (Insulation resistance) the graph.
  • Page 88: Function Setting

    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.) <Table 1>...
  • Page 89 (2) Functions available when setting the unit number to 01-03 or AL (07 in case of wireless remote controller) • When setting functions for an indoor unit in an independent system, set the unit number to 01 referring to 4 setting the indoor unit number.
  • Page 90 12-1-1. Selecting functions using the wired remote controller First, try to familiarize yourself with the flow of the function selection procedure. In this section, an example of setting the room temperature detection position is given. For actual operations, refer to steps Setting number Refrigerant address Unit number...
  • Page 91 [Operating Procedure] Check the setting items provided by function selection. If settings for a mode are changed by function selection, the functions of that mode will be changed accordingly. Check all the current settings according to steps , fill in the "Check" column in Table 1, then change them as necessary. For initial settings, refer to the indoor unit's installation manual. Switch off the remote controller.
  • Page 92 12-1-2. Selecting functions using the wireless remote controller (Type C) Functions can be selected with the wireless remote controller. Function selection using wireless remote controller is available only for refriger- ant system with wireless function. Refrigerant address cannot be specified by the wireless remote controller. [Flow of function selection procedure] The flow of the function selection procedure is shown below.
  • Page 93 12-2. FUNCTION SELECTION OF REMOTE CONTROLLER The setting of the following remote controller functions can be changed using the remote controller function selection mode. Change the setting when needed. Item 1 Item 2 Item 3 (Setting content) 1.Change language Language setting to display •...
  • Page 94 [Function selection flowchart] Normal display Hold down the button and press the button for 2 seconds. (Display when the air conditioner is not running) Setting language (English) Press the operation mode button. Hold down the button and press the button for 2 seconds. Press theTIMER MENU button.
  • Page 95 12-3. Function selection of wireless remote controller TEMPERATURE DISPLAY °C/°F SETTING (Change of temp mode from °F to °C) 1 Press the set button with something sharp at the end. MODEL SELECT blinks. AUTO START 2 Press the button. “F:” blinks. 3 Press the button.
  • Page 96: Monitoring The Operation Data By The Remote Controller

    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" A: Mode display B: Refrigerant address C: Data display area D: Request code display area (1) Press the button for 3 seconds so that [Maintenance mode] appears on the screen (at...
  • Page 97 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 Remarks (Display range) Operation state Refer to 13-2-1. Detail Contents in Request Code. – Compressor-Operating current (rms) 0 –...
  • Page 98 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 99 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 100 Description Request content Unit Remarks (Display range) Indoor-Fan operating time 0 – 9999 1 hour (After filter is reset) Indoor-Total operating time 0 – 9999 10 hours (Fan motor ON time) Indoor fan output value (Sj value) 0 – 255 Fan control data –...
  • Page 101 13-2-1. Detail Contents in Request Code Example) Request code "004" Discharge temperature 156°F Refrigerant address "00" A: Mode display B: Refrigerant address C: Data display area D: Request code display area [Operation state] (Request code : "0") Relay output state Power currently Data display Display...
  • Page 102 [Fan control state] (Request code : "53") Data display Fan step correction value by heatsink temperature overheat prevention control Fan step correction value by cool condensation temperature overheat prevention control Display Correction value - (minus) – 1 [Actuator output state] (Request code : "54") Data display Actuator output state Actuator output state...
  • Page 103 [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 104 [Outdoor unit switch setting display (SW1 to SW10, except SW3)] Request codes : 73 to 82 0: Switch OFF 1: Switch ON 0: Switch OFF 1: Switch ON SW1, SW2, SW6, SW7 Data display Data display 00 00 00 00 00 01 00 01 00 02...
  • Page 105 [Indoor unit – Model setting information] (Request code : 162) Data display Display Model setting state Display Model setting state See the table on the right. PKA-A·GA(L) PKA-A·FA(L) PCA-A·GA, PLA-A·BA PLA-A·AA PEA-A·AA PCA-A·KA PKA-A·HA(L)/KA(L) [Indoor unit – Capacity setting information] (Request code : 163) Data display Display Capacity setting state...
  • Page 106: Disassembly Procedure

    DISASSEMBLY PROCEDURE PUZ-A18NHA4 PUZ-A18NHA4-BS PUY-A12/18NHA4 PUY-A12/18NHA4-BS OPERATING PROCEDURE PHOTOS Photo 1 1. Removing the top panel, service panel, front panel and Top panel Top panel fixing screw 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.
  • Page 107 OPERATING PROCEDURE PHOTOS 3. Removing the electrical parts box Photo 5 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) Electrical parts box Controller circuit board (C.B.) (3) Remove the front panel. (See Photo 1) (4) Disconnect the indoor/outdoor connecting wire from terminal block.
  • Page 108 OPERATING PROCEDURE PHOTOS 5. Removing the thermistor <Outdoor> (TH7) Photo 7 (1) Remove the service panel. (See Photo 1) Thermistor <Outdoor> (2) Remove the top panel. (See Photo 1) Electrical parts box (TH7) (3) Disconnect the connector TH7 (red) on the controller circuit board in the electrical parts box.
  • Page 109 OPERATING PROCEDURE PHOTOS 8. Removing the 4-way valve Photo 10 (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the front panel. (See Photo 1) (4) Remove the conduit cover and cord cover. (See Photo 2) (5) Remove the back panel.
  • Page 110 OPERATING PROCEDURE PHOTOS 12. Removing the compressor (MC) Photo 13 (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.
  • Page 111 PUZ-A24/30/36NHA4(-BS) PUY-A24/30/36NHA4(-BS) OPERATING PROCEDURE PHOTOS & ILLUSTRATION Top panel fixing screws 1. Removing the service panel and top panel Figure 1 Top panel (1) Remove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service panel.
  • Page 112 OPERATING PROCEDURE PHOTOS Photo 4 4. Removing the thermistor <Outdoor 2-phase pipe> (TH6) (1) Remove the service panel. (See Figure 1) Thermistor Electrical Controller (2) Remove the top panel. (See Figure 1) <Outdoor 2-phase pipe> parts box circuit board (TH6) (3) Disconnect the connectors, TH6 and TH7 (red), on the (C.B.) controller circuit board in the electrical parts box.
  • Page 113 OPERATING PROCEDURE PHOTOS 8. Removing the 4-way valve coil (21S4), Photo 8 linear expansion valve coil (LEV-A) and bypass valve coil (SV) (1) Remove the service panel. (See Figure 1) 4-way valve coil (2) Remove the top panel. (See Figure 1) (3) Remove the electrical parts box.
  • Page 114 OPERATING PROCEDURE PHOTOS 11. Removing the bypass valve Photo 10 (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 × 12) in the rear of the unit and remove the right side panel.
  • Page 115 OPERATING PROCEDURE PHOTOS 14. Removing the reactor (DCL) (A30, 36) Photo 13 Reactor fixing screws (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 ×...
  • Page 116 PUZ-A42NHA4(-BS) PUY-A42NHA4(-BS) OPERATING PROCEDURE PHOTOS & ILLUSTRATION 1. Removing the service panel and top panel Top panel fixing screws Top panel Figure 1 (1) Remove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service Service panel panel.
  • Page 117 OPERATING PROCEDURE PHOTOS 4. Removing the thermistor <Outdoor 2-phase pipe> (TH6) Photo 4 Thermistor (1) Remove the service panel. (See Figure 1) <Outdoor 2-phase pipe> Electrical (2) Remove the top panel. (See Figure 1) Controller (TH6) parts box circuit board (3) Disconnect the connectors, TH6 and TH7 (red), on the (C.B.) controller circuit board in the electrical parts box.
  • Page 118 OPERATING PROCEDURE PHOTOS 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.
  • Page 119 OPERATING PROCEDURE PHOTOS 10. Removing the high pressure switch (63H) and Photo 8 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 × 12) in the rear of the unit and remove the right side panel.
  • Page 120 (MC) fixing screws HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN New publication, effective Nov. 2010 CCopyright 2010 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Specifications subject to change without notice Distributed in Nov. 2010 No.OCH481 Made in Japan...

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