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Mitsubishi Electric PUZ-A18NHA2 Service Manual

Split-type, heat pump air conditioners
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Table of Contents

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
Outdoor unit
SERVICE MANUAL
[model names]
PUZ-A18NHA2
PUZ-A24NHA2
PUZ-A30NHA2
PUZ-A36NHA2
PUZ-A42NHA2
PUZ-A18NHA2-BS
PUZ-A24NHA2-BS
PUZ-A30NHA2-BS
PUZ-A36NHA2-BS
PUZ-A42NHA2-BS
PUY-A12NHA2
PUY-A18NHA2
PUY-A24NHA2
PUY-A30NHA2
PUY-A36NHA2
PUY-A42NHA2
PUY-A12NHA2-BS
PUY-A18NHA2-BS
PUY-A24NHA2-BS
PUY-A30NHA2-BS
PUY-A36NHA2-BS
PUY-A42NHA2-BS
PUZ-A24/30/36NHA2
PUY-A24/30/36NHA2
R410A
[Service Ref.]
PUZ-A18NHA2
PUZ-A24NHA2
PUZ-A30NHA2
PUZ-A36NHA2
PUZ-A42NHA2
PUZ-A18NHA2-BS
PUZ-A24NHA2-BS
PUZ-A30NHA2-BS
PUZ-A36NHA2-BS
PUZ-A42NHA2-BS
PUY-A12NHA2
PUY-A18NHA2
PUY-A24NHA2
PUY-A30NHA2
PUY-A36NHA2
PUY-A42NHA2
PUY-A12NHA2-BS
PUY-A18NHA2-BS
PUY-A24NHA2-BS
PUY-A30NHA2-BS
PUY-A36NHA2-BS
PUY-A42NHA2-BS
CONTENTS
10. TROUBLESHOOTING ··································28
11. EASY MAINTENANCE FUNCTION ··············85
12. FUNCTION SETTING····································88
14. DISASSEMBLY PROCEDURE ···················106
November 2007
NOTE:
• This manual describes only
service data of the outdoor
units.
• RoHS compliant products
have <G> mark on the spec
name plate.
• For servicing RoHS compliant
products, refer to the RoHS
PARTS LIST.
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
PARTS CATALOG (OCB429)
No.OCH429

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Summary of Contents for Mitsubishi Electric PUZ-A18NHA2

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS Outdoor unit November 2007 No.OCH429 SERVICE MANUAL R410A [model names] [Service Ref.] PUZ-A18NHA2 NOTE: PUZ-A18NHA2 • This manual describes only PUZ-A24NHA2 PUZ-A24NHA2 service data of the outdoor PUZ-A30NHA2 PUZ-A30NHA2 units. PUZ-A36NHA2 PUZ-A36NHA2 •...

  • Page 2: Reference Manual

    REFERENCE MANUAL 1-1. INDOOR UNIT Service Model name Service Ref. Manual No. PLA-A12/18/24/30/36/42BA PLA-A12/18/24/30/36/42BA OCH420 OCB420 PCA-A24/30/36/42GA PCA-A24/30/36/42GA OC368 PKA-A12/18GA PKA-A12/18GA PKA-A12/18GAL PKA-A12/18GAL OC369 PKA-A24/30/36FA PKA-A24/30/36FA PKA-A24/30/36FAL PKA-A24/30/36FAL 1-2. TECHNICAL DATA BOOK Manual No. OCS13...

  • 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 time higher than that of R22, their sizes of flared sections and flare nuts are different.

  • Page 6: Features

    FEATURES PUZ-A18NHA2 PUZ-A24/30/36NHA2 PUZ-A18NHA2-BS PUZ-A24/30/36NHA2-BS PUY-A12/18NHA2 PUY-A24/30/36NHA2 PUY-A12/18NHA2-BS PUY-A24/30/36NHA2-BS PUZ-A42NHA2 PUZ-A42NHA2-BS PUY-A42NHA2 PUY-A42NHA2-BS CHARGELESS SYSTEM PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT. (Max. 100ft, 30m (A42) / Max. 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-A18NHA2 PUZ-A24NHA2 PUZ-A30NHA2 PUZ-A36NHA2 PUZ-A42NHA2 PUZ-A18NHA2-BS PUZ-A24NHA2-BS PUZ-A30NHA2-BS PUZ-A36NHA2-BS PUZ-A42NHA2-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-A12NHA2 PUY-A18NHA2 PUY-A24NHA2 PUY-A30NHA2 PUY-A36NHA2 PUY-A42NHA2 PUY-A12NHA2-BS PUY-A18NHA2-BS PUY-A24NHA2-BS PUY-A30NHA2-BS PUY-A36NHA2-BS PUY-A42NHA2-BS Power supply Phase 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 SNB130FPBM1...

  • Page 9: Data

    52 oz 46 oz PUY-A12NHA2 PUY-A12NHA2-BS 1.2 kg 1.2 kg 1.3 kg 1.4 kg 1.4 kg 1.5 kg 1.3 kg PUZ-A18NHA2 56 oz 58 oz 60 oz 62 oz 64 oz 66 oz 60 oz PUZ-A18NHA2-BS PUY-A18NHA2 PUY-A18NHA2-BS 1.6 kg 1.6 kg...
  • Page 10 5-3. NOISE CRITERION CURVES PUY-A24/30/36NHA2 PUY-A12/18NHA2 PUY-A12/18NHA2-BS PUY-A24/30/36NHA2-BS SPL(dB) MODE LINE MODE SPL(dB) LINE PUZ-A18NHA2 COOLING PUZ-A24/30/36NHA2 COOLING PUZ-A18NHA2-BS HEATING HEATING PUZ-A24/30/36NHA2-BS 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...
  • Page 11 60Hz 60Hz 60Hz 60Hz 60Hz Voltage 230V 230V 230V 230V 230V Current 0.33A 0.43A 0.43A 0.52A 1.00A 0.94A Outdoor unit model PUZ-A18NHA2 PUZ-A24NHA2 PUZ-A30NHA2 PUZ-A36NHA2 PUZ-A42NHA2 Phase Single Single Single Single Single Cycle 60Hz 60Hz 60Hz 60Hz 60Hz Voltage 230V...
  • Page 12 5-4-2. Cooling only Representative matching PKA-A12GA PKA-A18GA PKA-A24FA PKA-A30FA PKA-A36FA PLA-A42BA Mode COOLING COOLING COOLING COOLING COOLING COOLING 12 , 000 18 , 000 24 , 000 30 , 000 34 , 200 42 , 000 Total Capacity BTU/h 1 , 210 2 , 240 2 , 650 4 , 400...

  • Page 13: Outlines And Dimensions

    OUTLINES AND DIMENSIONS OUTDOOR UNIT Unit : mm<inch> PUZ-A18NHA2 PUZ-A18NHA2-BS PUY-A12/18NHA2 PUY-A12/18NHA2-BS 400<15-25/32> [33<1-5/16> drain hole 347.5<13-11/16> Air intake Air intake 45.4<1-25/32> Air outlet 4-oval hole 40<1-9/16> Service panel 18<23/32> 23<29/32> 22<7/8> Service panel for charge plug 2-ø22.2<7/8> 1/2 conduit hole...
  • Page 14 PUZ-A24/30/36NHA2 PUZ-A24/30/36NHA2-BS Unit : mm<inch> PUY-A24/30/36NHA2 PUY-A24/30/36NHA2-BS...
  • Page 15 PUZ-A42NHA2 PUZ-A42NHA2-BS Unit : mm<inch> PUY-A42NHA2 PUY-A42NHA2-BS...

  • Page 16: Wiring Diagram

    WIRING DIAGRAM PUZ-A18NHA2 PUZ-A18NHA2-BS PUY-A12/18NHA2 PUY-A12/18NHA2-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-A24NHA2 PUZ-A24NHA2-BS PUY-A24NHA2 PUY-A24NHA2-BS [LEGEND] SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block<Power Supply, Indoor/Outdoor> Converter LED1,LED2 LED<Operation Inspection Indicators> Motor for Compressor Power Module F1~F4 Fuse<T6.3AL250V> Fan Motor CB1~CB3 Main Smoothing Capacitor Switch<Pump Down> 21S4 Solenoid Valve (Four-Way Valve) N.F.
  • Page 18 PUZ-A30/36NHA2 PUZ-A30/36NHA2-BS PUY-A30/36NHA2 PUY-A30/36NHA2-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 Switch<Function Switch> Connection Terminal<U/V/W-Phase> Fan Motor TABS/T Connection Terminal<L1/L2-Phase> Switch<Model Select> 21S4 Solenoid Valve (Four-Way Valve) TABP1/P2 Connection Terminal<DC Voltage>...
  • Page 19 PUZ-A42NHA2 PUZ-A42NHA2-BS PUY-A42NHA2 PUY-A42NHA2-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 A Outdoor unit power supply B Wiring circuit breaker or isolating switch C Outdoor unit D Indoor unit/outdoor unit connecting cords E Remote controller...
  • Page 21 8-2. SEPARATE INDOOR UNIT/OUTDOOR UNIT POWER SUPPLIES The following connection patterns are available. The outdoor unit power supply patterns vary on models. 1:1 System * 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. o Size Outdoor power supply Max. 45m, 147ft Max. 50m, 164ft Max. 80m, 262ft 3 o AWG15(polar) 3 o AWG13(polar) 3 o AWG13(polar) and S3 separated Indoor unit-Outdoor unit w The max. cable length may vary depending on the condition of installation, humidity or materials, etc. Wire No.
  • Page 23 8-4. M-NET WIRING METHOD (Points to notice) (1) Outside the unit, transmission wires should stay away from electric wires in order to prevent electromagnetic noise from making an influence on the signal communication. Place them at intervals of more than 5cm. Do not put them in the same conduit tube.
  • Page 24 ● M-NET wiring M-NET (1) Use 2-core x 1.25mm [AWG16] shield wire for electric wires. terminal Ground (Excluding the case connecting to system controller.) block wire (2) Connect the wire to the M-NET terminal block. Connect one core of the transmission wire (non-polar) to A terminal and the other to B.

  • Page 25: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PUZ-A18NHA2 PUZ-A18NHA2-BS Unit : mm(inch) <4-way valve solenoid coil> High pressure Service Stop valve Heating : ON port(check) protect switch (with service port) Cooling : OFF 4-way valve Outdoor heat exchanger (#50) Refrigerant GAS pipe Strainer Thermistor 12.7A({1/2)
  • Page 26 PUY-A12/18NHA2 PUY-A12/18NHA2-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) 12.7A({1/2) Thermistor (TH3) Distributor Thermistor (TH4) Accumulator Compressor (#100) (#100) Strainer Strainer Refrigerant LIQUID pipe 6.35A({1/4) Stop valve Linear expansion valve...
  • Page 27 1. Refrigerant recovering (pump down) Perform the following procedures to recover the refrigerant when moving the indoor unit or the outdoor unit. 1Turn on the power supply (circuit breaker). wWhen power is supplied, make sure that “CENTRALLY CONTROLLED” is not displayed on the remote controller. If“CEN- TRALLY 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 altemately. 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. TEST RUN 2 Press the button twice continuously.
  • Page 31 10-3. HOW TO PROCEED "SELF-DIAGNOSIS" 10-3-1. When a Problem Occurs During Operation If a problem occurs in the air conditioner, the indoor and outdoor units will stop, and the problem is shown in the remote controller display. 1[CHECK] and the refrigerant address are displayed on the temperature display, and the error code and unit number are displayed alternately as shown below.
  • 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 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 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 Judgment and action Error Code Case 1 No voltage is supplied to terminal 1 Check following items.
  • Page 36 Error Code Abnormal point and detection method Case Judgment and action 1 Disconnection or contact failure 1 Check connection of 63H connector on 63H connector open Abnormal if 63H connector circuit is open of 63H connector on outdoor outdoor controller circuit board. for 3 minutes continuously after power sup- controller circuit board Refer to 10-9.
  • Page 37 <Abnormalities detected while unit is operating> <Abnormalities detected while unit is operating> Abnormal point and detection method Judgment and action Error Code Case 1 Short cycle of indoor unit 1~6Check indoor unit and repair the defect. High pressure (High-pressure switch 2 Clogged filter of indoor unit 63H worked) 3 Decreased airflow caused by...
  • Page 38 Abnormal point and detection method Judgment and action Error Code Case 1 Disconnection or contact 1 Check connection of connector (TH4) on the Open/short circuit of discharge temperature thermistor (TH4) failure of connector (TH4) on outdoor controller circuit board. Check breaking of the lead wire for Abnormal if open (3: [37˚F] or less) or the outdoor controller circuit thermistor (TH4).
  • Page 39 Abnormal point and detection method Judgment and action Error Code Case 1 Failure in the operation of 1 Check or replace the DC fan motor. Outdoor fan motor The outdoor fan motor is considered to be the DC fan motor 2 Failure in the outdoor circuit 2 Check the voltage of the outdoor circuit abnormal if the rotational frequency of fan...
  • Page 40 Abnormal point and detection method Judgment and action Error Code Case 1 Stop valve of outdoor unit is 1 Check stop valve. Low pressure (63L worked) Abnormal if 63L is worked (under- closed during operation. 2 Disconnection or loose connection 2~4 Turn the power off and on again to check 0.03MPa) during compressor operation.
  • Page 41 Abnormal point and detection method Judgment and action Case Error Code 1 Set a remote controller to main, and the Remote controller transmission 1 2 remote controller are set as error(E3)/signal receiving error(E5) other to sub. 1 Abnormal if remote controller could not “main.”...
  • Page 42 Abnormal point and detection method Judgment and action Error Code Case 1 Slight temperature difference Pipe temperature 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 Error Code Abnormal point and detection method Case Judgment and action 1 Data of transmission proces- Communication error with communica- Turn off the power supply of outdoor unit and indoor unit and FRESH MASTER or LOSSNAY tion processor sor or unit processor is not at the same time for 2 minutes or more, and transmitted normally because Defective communication between unit...
  • Page 44 From the previous page. Error Code Abnormal point and detection method Case Judgment and action 1 During group operation with 4. If displayed address or attribute is Same as mentioned in “A7” of the previous page. remote controller, indoor unit of multi- refrigerant system, if indoor unit transmit Indoor unit detects abnormality when to remote controller while out-...
  • Page 45 Error Code Abnormal point and detection method Case Judgment and action 1 Transmitting condition is 1 Check transmission waveform or noise on M-NET NO RESPONSE Abnormal if a message was transmitted repeated fault because of transmission wire. 2 Turn off the power supply of outdoor unit and noise and the like.
  • Page 46 Factor Phenomena Countermeasure 1The pair number settings of the wireless remote 1Check the pair number settings. 4. Even controlling by the wireless remote controller no beep is heard controller and indoor controller board are mis- and the unit does not start operat- matched.
  • 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 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller 1 LED1 : 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 49 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller 2 LED1 : 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 Symptoms: Nothing is displayed on the remote controller 3 LED1 : 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 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 52 Phone Calls From Customers How to Respond Note 1 Check the set temperature of remote controller. The room cannot be cooled or heated sufficiently. 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 3 Air blows out for a while after 3 This is not a malfunction. Something However, this control is also 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 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;...
  • Page 55 10-6. HOW TO CHECK THE PARTS PUZ-A18/24/30/36/42NHA2 PUZ-A18/24/30/36/42NHA2-BS PUY-A12/18/24/30/36/42NHA2 PUY-A12/18/24/30/36/42NHA2-BS 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> 160k"~410k" Thermistor (TH6) <Outdoor 2-phase pipe>...
  • 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. Give attention to the service. · Do not pull out the connector (CNF1, 2) for the motor with the power supply on. (It causes trouble of the outdoor controller circuit board and fan motor.) 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 indoor 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 indoor 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> 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 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 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 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 fluid pipe temperature (TH2)
  • Page 64 10-9. TEST POINT DIAGRAM <CAUTION> TEST POINT1 is high voltage. Outdoor controller circuit board PUZ-A18/24/30/36/42NHA2 PUZ-A18/24/30/36/42NHA2-BS PUY-A12/18/24/30/36/42NHA2 PUY-A12/18/24/30/36/42NHA2-BS CN51 Demand control setting Forced defrost, detect history record reset, refrigerant address External signal output • Compressor operating signal • Abnormal signal Model select CNDM Test operation...
  • Page 65 Outdoor noise filter circuit board PUZ-A18NHA2 PUZ-A18NHA2-BS PUY-A12/18NHA2 PUY-A12/18NHA2-BS LI, NI Voltage of 208/230V AC is input. Connect to the 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 Outdoor noise filter circuit board PUZ-A24NHA2 PUZ-A24NHA2-BS PUY-A24NHA2 PUY-A24NHA2-BS EI, E2 Connect to the earth CNAC1, CNAC2 Connect to 208/230V AC the earth (Connect to the outdoor controller circuit board (CNAC)) Primary current (Connect to the outdoor power circuit board (CN5)) CN52C 52C relay signal...
  • Page 67 Outdoor noise filter circuit board PUZ-A30/36/42NHA2 PUZ-A30/36/42NHA2-BS PUY-A30/36/42NHA2 PUY-A30/36/42NHA2-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 controller circuit board...
  • Page 68 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-A18NHA2 Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken.
  • Page 69 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-A30/36/42NHA2 Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken. PUZ-A30/36/42NHA2-BS 1.
  • Page 70 Active filter module PUZ-A30/36/42NHA2 PUZ-A30/36/42NHA2-BS PUY-A30/36/42NHA2 PUY-A30/36/42NHA2-BS Connect to the outdoor power circuit board (TABP2) L1, L2 Connect to the DCL (Reactor) Non-connect Upper side Lower side Non-connect Connect to the outdoor power circuit board (TABP1) – Connect to the outdoor power circuit board Connect to the outdoor power cir- (TABN1) cuit board (CNAF)
  • Page 71 10-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS (1) Function of switches Type Action by the switch operation Function Effective timing Switch switch When compressor is working Forced defrost w1 Start Normal in heating operation. w1 Abnormal history clear Clear Normal Off or operating 1 2 3 4 5 6...
  • Page 72 Action by the switch operation Type of Switch Function Effective timing Switch No function — — — Power failure Auto recovery No auto recovery When power supply ON automatic recovery w2 No function — — — 3,4,5 Model select Following SW5-6 reference Power consumption SW7-1 SW7-2...
  • 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 reference code LED1 (Green) LED2 (Red) page 1Check if stop valves are open. 3 blinking 1 blinking P.37 Abnormality of shell thermostat 2Check if connectors (TH4, 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’. Operation indicator SW2 : Indicator change of self diagnosis SW2 setting...
  • Page 77 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; 2 3 4 5 6 0.5 secs.
  • Page 78 SW2 setting Display detail Explanation for display Unit 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; 0.5 secs.
  • Page 79 SW2 setting Display detail Explanation for display 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 Capacity Code Code...
  • Page 80 SW2 setting Display detail Explanation for display Unit Indoor setting temperature 62~86 (17~30:) 62~86 ˚F 2 3 4 5 6 Outdoor pipe temperature / Cond./ -38~190 (-39~88:) Eva. (TH6) (When the temperature is 0˚F or less, “–” and -38~190 temperature are displayed by turns.) ˚F 2 3 4 5 6 Outdoor outside temperature (TH7)
  • Page 81 SW2 setting Display detail Explanation for display Unit 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%; M-NET and capacity save mode is 0.5 secs.
  • Page 82 SW2 setting Display detail Explanation for display Unit 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; Pulse 0.5 secs. 0.5secs.
  • Page 83 SW2 setting Display detail Explanation for display Unit 0~327 (0~182degC) Discharge superheat on error occurring (When the temperature is 100degF or more, hundreds digit, tens digit and ones digit are 0~327 displayed by turns.) degF (Example) When 150degF; Cooling = TH4-TH6 0.5 secs.
  • Page 84 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 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 ●...
  • 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 Inspection item Result Check Points 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) M"...

  • 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 1 to 0 . Setting number Refrigerant address Unit number...
  • Page 91 [Operating Procedure] 1 Check the setting items provided by function selection. If settings for a mode are changed by function selection, the functions of that mode will be changed accordingly. Check all the current settings according to steps 2 to 7 , fill in the "Check" column in Table 1, then change them as necessary. For initial settings, refer to the indoor unit's installation manual. 2 Switch off the remote controller.
  • 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 :/-F SETTING (Change of temp mode from -F to :) 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 button for 3 seconds so that [Maintenance mode] appears on the screen (at A).
  • 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. Refer to 13-2-1.Detail Contents in Request Code. Compressor-Frequency control state – 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 1 Actuator output state 2...
  • 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 input...
  • 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 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 [Indoor unit – Capacity setting information] (Request code 163 ) Data display Display Capacity setting state...

  • Page 106: Disassembly Procedure

    DISASSEMBLY PROCEDURE PUZ-A18NHA2 PUZ-A18NHA2-BS OPERATING PROCEDURE PHOTOS Top panel 1. Removing the top panel, service panel, front panel and Photo 1 Top panel fixing screws 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.) (3) Remove the front panel. (See photo 1.) Controller circuit Electrical parts box board (C.B.) (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-A24/30/36NHA2 PUZ-A24/30/36NHA2-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 ✕ 10) and slide the hook on the right downward to remove the service panel.
  • Page 112 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 parts box (TH6) (3) Disconnect the connectors, TH6 and TH7 (red), on the circuit board controller circuit board in the electrical parts box.
  • Page 113 OPERATING PROCEDURE PHOTOS 7. Removing the 4-way valve coil (21S4), Photo 7 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 10. Removing the bypass valve Photo 9 (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.
  • Page 115 OPERATING PROCEDURE PHOTOS Reactor fixing screw 13. Removing the reactor (DCL) (A30, 36) Photo 12 (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-A42NHA2 PUZ-A42NHA2-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 ✕ 10) 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 parts box (TH6) 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 ✕...
  • 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 ✕ 10) in the rear of the unit and remove the right side panel.
  • Page 120 Accumulator leg (MC) fixing screws HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. New publication, effective Nov. 2007 Specifications subject to change without notice Distributed in Nov. 2007 No.OCH429 PDF 9...

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