Mitsubishi Electric Mr.SLIM PUZ-HA24NHA Service Manual
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Mitsubishi Electric Mr.SLIM PUZ-HA24NHA Service Manual

Mitsubishi Electric Mr.SLIM PUZ-HA24NHA Service Manual

Split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
[Model Name]
PUZ-HA24NHA
R410A
[Service Ref.]
PUZ-HA24NHA
Notes:
• This manual describes service
data of the outdoor units only.
CONTENTS
1. REFERENCE MANUAL ····························· 2
2. SAFETY PRECAUTION ····························· 2
3. FEATURES ············································· 6
4. SPECIFICATIONS ···································· 7
5. DATA······················································ 8
6. OUTLINES AND DIMENSIONS ················· 10
7. WIRING DIAGRAM ································· 11
8. WIRING SPECIFICATIONS ······················ 12
9. REFRIGERANT SYSTEM DIAGRAM ············ 16
10. TROUBLESHOOTING ····························· 17
11. EASY MAINTENANCE FUNCTION ············ 70
12. FUNCTION SETTING ······························ 72
14. DISASSEMBLY PROCEDURE ·················· 87
PARTS CATALOG (OCB721)
October 2019
No. OCH721
REVISED EDITION-A
Revision:
• Some descriptions have
been modified
in REVISED EDITION-A.
OCH721 is void.

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Summary of Contents for Mitsubishi Electric Mr.SLIM PUZ-HA24NHA

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS October 2019 No. OCH721 SERVICE MANUAL REVISED EDITION-A R410A Revision: [Service Ref.] [Model Name] • Some descriptions have been modified PUZ-HA24NHA in REVISED EDITION-A. PUZ-HA24NHA OCH721 is void. Notes: • This manual describes service data of the outdoor units only. CONTENTS 1.

  • Page 2: Reference Manual

    REFERENCE MANUAL INDOOR UNIT Model name Service Ref. Service manual No. PLA-A24EA7 PLA-A24EA7 OCH640/OCB640 PKA-A24KA7 PKA-A24KA7.TH OCH639/OCB639 PCA-A24KA7 PCA-A24KA7.TH OCH638/OCB638 PEAD-A24AA7 PEAD-A24AA7 HWE1608A/BWE01629A PVA-A24AA7 PVA-A24AA7 MD-1404-K011/MD-1404-K012 SAFETY PRECAUTION 2-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. Preparation before the repair service.
  • 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 case of using the existing pipes for R22, be careful with Vacuum pump oil may flow back into refrigerant cycle and the following.
  • 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-HA24NHA HIGH HEATING CAPACITY High capacity compressor is equipped, which enables to keep Performance (Btu/h) 60%UP about the equal capacity to the rating even when outside temperature 30,000 HA24 is 5°F [−15°C]. 26,000Btu/h 20,000 16,500Btu/h -13°F -4°F 5°F 14°F 23°F 32°F [-25°C]...

  • Page 7: Specifications

    SPECIFICATIONS Service Ref. PUZ-HA24NHA Power supply Phase Single Cycle 60 Hz Voltage 208/230 V MOCP Breaker size External finish Munsell 3Y 7.8/1.1 Heat exchanger Plate fin coil Defrost method Reverse cycle Crankcase heater — Compressor Hermetic Model DNB28FBAMT Motor output R.L.A.

  • Page 8: Data

    DATA 5-1. REFILLING REFRIGERANT CHARGE (R410A: oz, kg) Service Ref. Piping length (one way) PUZ-HA24NHA 50 ft 60 ft 70 ft 80 ft 90 ft 100 ft 110 ft 120 ft 130 ft 140 ft 150 ft 160 ft 165 ft Factory 15 m 18 m...
  • Page 9 5-4. STANDARD OPERATION DATA Representative matching PLA-A24EA7 Mode COOLING HEATING Total Capacity Btu/h 24,000 26,000 Input 1,710 1,700 Indoor unit model PLA-A24EA7 Phase Single Cycle 60 Hz Voltage 208/230 V Current 0.49 A Outdoor unit model PUZ-HA24NHA Phase Single Cycle 60 Hz Voltage 208/230 V...

  • Page 10: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PUZ-HA24NHA Unit: mm<inch> OCH721A...

  • Page 11: Wiring Diagram

    WIRING DIAGRAM PUZ-HA24NHA OCH721A...

  • Page 12: Wiring Specifications

    WIRING SPECIFICATIONS 8-1. INDOOR UNIT POWER SUPPLIED FROM OUTDOOR UNIT The following connection patterns are available. The outdoor unit power supply patterns vary on models. 1:1 System A Outdoor unit power supply B Earth leakage breaker C Wiring circuit breaker or isolating switch D Outdoor unit E Indoor unit/outdoor unit connecting cords F Remote controller...
  • Page 13 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 Earth leakage breaker Wiring circuit breaker or isolating switch Outdoor unit Indoor unit/outdoor unit connecting cords...
  • Page 14 8-4. M-NET WIRING METHOD Points to notice: (1) Outside the unit, transmission wires should stay away from electric wires in order to prevent electromagnetic noise from making an influence on the signal communication. Place them at intervals of more than 5cm. Do not put them in the same conduit tube. (2) Terminal block (TB7) for transmission wires should never be connected to 208/230 V power supply.
  • Page 15 8-4-1. M-NET address setting In A-control models, M-NET address and refrigerant address should be set only for the outdoor unit. Similar to CITY MULTI series, there is no need to set the address of outdoor unit and remote controller. To construct a central control system, the setting of M-NET address should be conducted only upon the outdoor unit.

  • Page 16: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PUZ-HA24NHA Unit: mm (in) Thermistor TH7 (Ambient) Heat exchanger Thermistor Solenoid valve Ball valve Refrigerant (2-phase pipe) (4-way valve) GAS pipe connection Strainer [15.88(5/8) (#50) Charge plug Thermistor TH3 (High pressure) (Liquid) Charge plug Muffler High pressure Distributor (Low pressure) switch 63H...

  • Page 17: 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 18 10-2-1. Test run for wired remote controller <PAR-4xMAA, PAR-3xMAA ("x" represents 0 or later)> RETURN SELECT MENU HOLD MENU RETURN SELECT ON/OFF Function buttons PAR-4xMAA PAR-3xMAA Select "Service" from the Main menu, and press the [SELECT] button. Test run Test run Input maintenance info.
  • Page 19 <Error information> When an error occurs, the following screen will appear. Check the error status, stop the operation, and consult your dealer. PAR-4xMAA PAR-3xMAA Check code, error unit, refrigerant address, unit model name, and Error information Error information serial number will appear. (Date and time of occurrence of the er- Error code Error code ror will also appear on PAR-4xMAA.)
  • Page 20 <Checking the error information> PAR-4xMAA PAR-3xMAA Maintenance menu Main Main menu While no errors are occurring, page 2/2 of the error information Error information Restriction can be viewed by selecting "Error information" from the Mainte- Filter information Energy saving nance menu (PAR-4xMAA) or Main menu (PAR-3xMAA). Cleaning Night setback Filter information...
  • Page 21 10-2-2. Test run for wireless remote controller Test run [for IR wireless remote controller] 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 M". TEST COOL 1 Turn on the main power to the unit.
  • Page 22 10-3. HOW TO PROCEED "SELF-DIAGNOSIS" 10-3-1. Self-diagnosis <PAR-4xMAA, PAR-3xMAA ("x" represents 0 or later)> <PAR-4xMAA> PAR-4xMAA PAR-3xMAA Select "Service" from the Main menu, Diagnosis and press the [SELECT] button. Self check Test run Remote controller check Input maintenance info. Function setting Select "Check"...
  • Page 23 10-3-2. Remote controller check <PAR-4xMAA, PAR-3xMAA ("x" represents 0 or later)> If operations cannot be completed with the remote controller, diagnose the remote controller with this function. <PAR-4xMAA> PAR-4xMAA PAR-3xMAA Select "Service" from the Main menu, and press Diagnosis Self check Maintenance password the [SELECT] button.
  • Page 24 10-3-4. Malfunction-diagnosis method by IR wireless remote controller <In the 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> Refrigerant address [Procedure]...
  • Page 25 • 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 s 0.5 s 0.5 s. 0.5 s Approx.
  • Page 26 10-4. 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 1 No voltage is supplied to terminal 1 Check following items.
  • Page 27 Check code Abnormal points and detection method Cause judgment and action 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 28 Check code Abnormal points and detection method Cause judgment and action 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 3 Decreased airflow caused by dirt of indoor fan worked (*) during compressor operation.
  • Page 29 Check code Abnormal points and detection method Cause judgment and action Open/short circuit of outdoor unit 1 Disconnection or contact failure 1 Check connection of connector (TH4, TH33) temperature thermistor (TH4, TH33) of connectors (TH4, TH33) on on the outdoor controller circuit board. Check breaking of the lead wire for TH4 or TH33.
  • Page 30 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 "10-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS". codes Overvoltage error 1 Abnormal increase in power 1 Check the field facility for the power supply.
  • Page 31 Check code Abnormal points and detection method Cause judgment and action Compressor overcurrent interruption 1 Stop valve is closed. 1 Open stop valve. (When compressor locked) 2 Decrease of power supply voltage 2 Check facility of power supply. Abnormal if overcurrent of DC bus or 3 Looseness, disconnection or 3 Correct the wiring (U·V·W phase) to compressor is detected within 30 seconds...
  • Page 32 Check code Abnormal points and detection method Cause judgment and action Remote controller transmission error 1 Contact failure at transmission 1 Check disconnection or looseness of indoor (E0)/signal receiving error (E4) wire of remote controller unit or transmission wire of remote controller. 1 Abnormal if main or sub remote controller 2 All remote controllers are set 2 Set one of the remote controllers “main”.
  • Page 33 Check code Abnormal points and detection method Cause judgment and action Indoor/outdoor unit communication error 1 Contact failure of indoor/out- 1 Check disconnection or looseness of indoor/ (Signal receiving error) door unit connecting wire outdoor unit connecting wire of indoor or out- (Outdoor unit) 2 Defective communication circuit door units.
  • Page 34 Check code Abnormal points and detection method Cause judgment and action Abnormal refrigerant circuit 1 Abnormal operation of 4-way 1 When this error occurs, be sure to replace During Cooling, Dry, or Auto Cooling valve the 4-way valve. operation, the following conditions are 2 Disconnection of or leakage in 2 Check refrigerant pipes for disconnection or regarded as failures when detected for 1...
  • Page 35 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. 1. Transmitting side controller detects 1 The unit of former address abnormal if a message was transmitted does not exist as address 1 Turn off the power supply of outdoor unit...
  • Page 36 From the previous page. Check code Abnormal points and detection method Cause judgment and action Same as mentioned in "A7" of the previous 5. If displayed address or attribute is 1 During sequential operation of indoor unit and FRESH page. FRESH MASTER, MASTER of other refrigerant Indoor unit detects abnormality when...
  • Page 37 10-5. TROUBLESHOOTING OF PROBLEMS Phenomena Factor Countermeasure 1. Remote controller display does not 1 12 VDC is not supplied to remote controller. 1Check 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 2 12–15 VDC is supplied to remote controller, how- breaking or contact failure.
  • Page 38 Phenomena Factor Countermeasure 6. Remote controller display works 1 Refrigerant shortage 1 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 39 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 40 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 of the indoor unit. 198 to 253 VAC? Check the voltage among L1 and L2 on the terminal block of the...
  • Page 41 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 of the indoor unit. 198 to 253 VAC? Not lighting.
  • Page 42 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 indoor unit. 10 to 16 VDC? •...
  • Page 43 • Before repair Frequent calls from customers Phone Calls From Customers How to Respond Note Unit does 1 The operating display of remote 1 Check if power is supplied to air conditioner. not operate controller does not come on. Nothing appears on the display unless power is at all.
  • Page 44 Phone Calls From Customers How to Respond Note The room cannot be cooled or heated sufficiently. 1 Check the set temperature of remote controller. The outdoor unit cannot be operated if the set temperature is not appropriate. The outdoor unit operates in the following modes. COOL: When the set temperature is lower than the room temperature.
  • Page 45 Phone Calls From Customers How to Respond Note Something 3 Air blows out for a while after However, this control is also 3 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 46 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 47 10-6. HOW TO CHECK THE PARTS PUZ-HA24NHA Parts name Checkpoints Thermistor (TH3) Disconnect the connector then measure the resistance with a tester. <Liquid> (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 48 Check method of DC fan motor (fan motor/outdoor controller circuit board) 1 Notes · High voltage is applied to the connector (CNF1) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNF1) for the motor with the power supply on. (It causes trouble of the outdoor controller circuit board and fan motor.) 2 Self check Symptom: The outdoor fan cannot rotate.
  • Page 49 10-7. HOW TO CHECK THE COMPONENTS <Thermistor feature chart> Low temperature thermistors • Thermistor <Liquid> (TH3) • Thermistor <2-phase pipe> (TH6) • Thermistor <Ambient> (TH7) Thermistor R0 = 15 kΩ ± 3% B constant = 3480 ± 2% =15exp{3480( 273+t – 273 )} t (°C): R =15exp{3480( 273+(T–...
  • Page 50 Linear expansion valve (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 51 (3) How to attach and detach the coil of linear expansion valve <Composition> Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Coil Main body 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 52 10-8. EMERGENCY OPERATION (1) When any check codes shown below is displayed on outdoor unit, or microprocessor for wired remote controller or indoor unit has a failure while no other problems are found, emergency operation will be available by setting the emergency opera- tion switch (SWE) ON and short-circuiting the connector (CN31) on outdoor controller board.
  • Page 53 (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 Remarks Operation data COOL HEAT Intake temperature (TH1) 81°F [27°C] 69°F [20.5°C] Indoor liquid temperature (TH2)
  • Page 54 10-9. TEST POINT DIAGRAM Outdoor controller circuit board PUZ-HA24NHA Demand control setting Manual defrost, detect CNDM Model select history record reset, 1 to 2: Input of low-level refrigerant address CN3S sound priority Water heater CN51 mode Water heater Comp protect 1 to 3: Input of external contact point Test operation...
  • Page 55 Outdoor power circuit board Brief Check of POWER MODULE PUZ-HA24NHA If they are short-circuited, it means that they are broken. Measure the resistance in the following points (connectors, etc.). 1. Check POWER MODULE 1 Check of DIODE circuit R – P1 S –...
  • Page 56 10-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS (1) Function of switches Type Action by the switch operation Switch Function Effective timing switch When compressor is working Manual defrost Start Normal in heating operation. Abnormal history clear Clear Normal off or operating 1 2 3 4 5 6 1 2 3 4 5 6...
  • Page 57 Action by the switch operation Type of Switch No. Function Effective timing Switch No function — — — Power failure Auto recovery No auto recovery When power supply ON automatic recovery * 3,4,5 No function — — — Mode select Following SW5-6 reference Mode select * Demand function...
  • Page 58 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 59 <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 60 Indication Error Outdoor controller board Detailed Check Contents Inspection method reference code* LED (Green) LED2 (Red) page 2 blinking 5 blinking Serial communication error 1 Check if connector (CN4) on outdoor controller board and outdoor P.33 <Communication between outdoor power board is not disconnected. controller board and outdoor power board>...
  • Page 61 <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”. Operation indicator SW2: Indicator change of self-diagnosis SW2 setting...
  • Page 62 SW2 setting Display detail Explanation for display Unit Pipe temperature/Liquid (TH3) −40–194 (−40–90°C) −40–194 (When the coil thermistor detects 0˚F or below, “–” and temperature are displayed by turns.) °F (Example) When −10˚F; [°C] 2 3 4 5 6 0.5 s 0.5 s Discharge temperature (TH4) 37–327 (3–164°C)
  • Page 63 SW2 setting Display detail Explanation for display Unit Pipe temperature/Liquid (TH3) on error −40–194 (–40–90°C) occurring (When the coil thermistor detects 0˚F or below, “–” −40–194 and temperature are displayed by turns.) °F (Example) When –15˚F; [°C] 0.5 s 0.5 s 2 3 4 5 6 Compressor temperature (TH4) or 37–327 (3–164°C)
  • Page 64 SW2 setting Display detail Explanation for display Unit 0–3 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 Code HA24N...
  • Page 65 SW2 setting Display detail Explanation for display Unit Indoor setting temperature 62–86 (17–30°C) °F 62–86 [°C] 2 3 4 5 6 Outdoor pipe temperature/2-phase −38–190 (−39–88°C) (TH6) (When the temperature is 0˚F or less, “–” and −38–190 temperature are displayed by turns.) °F [°C] 2 3 4 5 6...
  • Page 66 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 s 0.5 s demanded, a value from “0”...
  • Page 67 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 s 0.5 s 2 3 4 5 6 Indoor room temperature (TH1) on error...
  • Page 68 SW2 setting Display detail Explanation for display Unit 0–327 (0–182°C) Discharge superheat on error occurring (When the temperature is 100˚F or more, hundreds digit, tens digit and ones digit are 0–327 displayed by turns.) °F (Example) When 150°F; Cooling = TH4−TH6 [°C] 0.5 s 0.5 s...
  • Page 69 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 70: Easy Maintenance Function

    EASY MAINTENANCE FUNCTION 11-1. SMOOTH MAINTENANCE Maintenance data, such as the indoor/outdoor unit’s heat exchanger temperature and compressor operation current can be displayed with “Smooth maintenance”. This cannot be executed during test operation. Depending on the combination with the outdoor unit, this may not be supported by some models. PAR-4xMAA PAR-3xMAA Check menu...
  • Page 71 11-2. GUIDE FOR OPERATION CONDITION Check Points into the graph given below. Enter the temperature differences between Operation state is determined according to the plotted areas on the graph. For data measurements, set the fan speed to "Hi" before activat ing maintenance mode. Inspection item Result Classification...

  • Page 72: 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 4 setting the indoor unit number.) <Table 1>...
  • Page 73 12-1-1. Selecting functions using the wired remote controller <Service menu> Maintenance password is required PAR-4xMAA PAR-3xMAA Main Main menu Select "Service" from the Main menu, and press the [SELECT] button. Main Main menu Maintenance Initial setting Service *At the main display, the menu button and select "Service" to make Service the maintenance setting.
  • Page 74 <Function setting> PAR-4xMAA PAR-3xMAA <PAR-4xMAA> Select "Service" from the Main menu, and press Settings menu Test run Function setting the [SELECT] button. Input maintenance info. Function setting Check Select "Setting" from the Service menu, and press Self check Service menu: MENU the [SELECT] button.
  • Page 75 12-1-2. Selecting functions using the IR wireless remote controller (Type C) Functions can be selected with the IR wireless remote controller. Function selection using the IR wireless remote controller is available only for refrigerant system with wireless function. Refrigerant address cannot be specified by the IR wireless remote controller. [Flow of function selection procedure] Flow of function selection procedure The flow of the function selection procedure is shown below.
  • Page 76 12-2. Function selection of the IR wireless remote controller TEMPERATURE DISPLAY -C/-F SETTING (Change of temp mode from -F to -C) 1Press the set button with something sharp at the end. MODEL SELECT blinks. AUTO START 2Press the button. “°F” blinks. 3Press the button.

  • Page 77: Monitoring The Operation Data By The Remote Controller

    MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER 13-1. HOW TO "MONITOR THE OPERATION DATA" 13-1-1. <PAR-4xMAA, PAR-3xMAA ("x" represents 0 or later)> Details on the operation data including each thermistor temperature and error history can be confirmed with the remote controller. PAR-4xMAA PAR-3xMAA Select "Service"...
  • Page 78 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) 0–50 Compressor-Accumulated operating time 0–9999...
  • Page 79 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 –...
  • Page 80 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 81 Description Request content Unit Remarks (Display range) Indoor-Fan operating time 1 hour 0–9999 (After filter is reset) Indoor-Total operating time 0–9999 10 hours (Fan motor ON time) Indoor fan output value (Sj value) Fan control data – For indoor fan phase control 0–255 Indoor fan output value "...
  • Page 82 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 83 [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 84 [Contact demand capacity] (Request code: 61 ) Setting content Data display Display Setting value Setting content 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 input...
  • Page 85 [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 86 [Indoor unit – Model setting information] (Request code: 162) Data display Display Model setting state Display Model setting state PEAD-A·AA PEAD-A·AA See the table on the right. PVA-A·AA PLA-A·BA PEA-A·AA PCA-A·KA PKA-A·HA(L)/KA(L) PEAD-A·AA PEAD-A·AA [Indoor unit – Capacity setting information] (Request code: 163 ) Data display Display Capacity setting state...

  • Page 87: Disassembly Procedure

    DISASSEMBLY PROCEDURE PUZ-HA24NHA : Indicates the visible 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 88 OPERATING PROCEDURE PHOTOS/FIGURES Photo 5 4. Removing the thermistor <Liquid> (TH3) and thermistor Thermistor Electrical parts box <2-phase pipe> (TH6) <2-phase pipe> (TH6) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) Thermistor Controller <Ambient>...
  • Page 89 OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the 4-way valve coil (21S4), LEV coil (LEV(A), Photo 8 LEV(B)) 4-way valve coil 4-way valve 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 90 OPERATING PROCEDURE PHOTOS/FIGURES Photo 9 10. Removing the high pressure switch (63H) Lead wire of (1) Remove the service panel. (See Photo 1) high pressure switch (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 4) (4) Remove 3 right side panel fixing screws (5 ×...
  • Page 91 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) (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 92 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued: Oct. 2019 No. OCH721 REVISED EDITION-A Published: Sep. 2019 No. OCH721 Specifications are subject to change without notice. Made in Japan...

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