Mitsubishi Electric Mr. SLIM PCA-M71HA2 Service Manual
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Mitsubishi Electric Mr. SLIM PCA-M71HA2 Service Manual

Split-type, heat pump air conditioners; split-type, air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Indoor unit
[Model Name]
PCA-M71HA2
PCA-M71HA2-ET
PCA-M71HA2-ER
Model name
indication
[Service Ref.]
PCA-M71HA2
PCA-M71HA2-ET
PCA-M71HA2-ER
INDOOR UNIT
REVISED EDITION-A
R32/R410A
Revision:
• Wiring diagram has been updated
in REVISED EDITION-A.
OCH753 is void.
Notes:
• This manual describes
CONTENTS
1. REFERENCE MANUAL ······················· 2
2. SAFETY PRECAUTION ······················· 3
3. PARTS NAMES AND FUNCTIONS ········ 8
4. SPECIFICATIONS ······························ 9
5. NOISE CRITERION CURVES ··············· 9
6. OUTLINES AND DIMENSIONS ··········· 10
7. WIRING DIAGRAM ··························· 11
9. TROUBLESHOOTING ······················· 12
10. SPECIAL FUNCTION ························ 22
11. DISASSEMBLY PROCEDURE ············ 24
12. REMOTE CONTROLLER ··················· 28
PARTS CATALOG (OCB753)
January 2022
No. OCH753
service data of the
indoor units only.

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  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS January 2022 No. OCH753 REVISED EDITION-A SERVICE MANUAL R32/R410A Indoor unit Revision: [Model Name] [Service Ref.] • Wiring diagram has been updated PCA-M71HA2 in REVISED EDITION-A. PCA-M71HA2 OCH753 is void. PCA-M71HA2-ET PCA-M71HA2-ET PCA-M71HA2-ER Notes: •...

  • Page 2: Reference Manual

    REFERENCE MANUAL 1-1. OUTDOOR UNIT’S SERVICE MANUAL Service Manual No. Model Name Service Ref. Parts Catalog No. OCH635 PUHZ-ZRP71VHA2 PUHZ-ZRP71VHA2(-ET/-ER) OCB635 PUHZ-ZRP140VKA3 PUHZ-ZRP140VKA3(R1).UK OCH645 PUHZ-ZRP140YKA3 PUHZ-ZRP140YKA3(R1/R2).UK OCB645 OCH680 PUHZ-ZRP250YKA3 PUHZ-ZRP250YKA3.UK OCB680 PUZ-ZM71VHA PUZ-ZM71VHA3.UK ― PUZ-ZM140VKA2 PUZ-ZM140VKA2.UK OCH771 PUZ-ZM140YKA2 PUZ-ZM140YKA2.UK OCB771 OCH775 PUZ-ZM250YKA2 PUZ-ZM250YKA2.UK...

  • Page 3: Safety Precaution

    SAFETY PRECAUTION MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT This mark is for R32 refrigerant only. Refrigerant type is written on nameplate of outdoor unit. WARNING Read the OPERATION MANUAL carefully before operation. Service personnel are required to carefully read the OPERATION MANUAL and INSTALLATION MANUAL before operation. Further information is available in the OPERATION MANUAL, INSTALLATION MANUAL, and the like.
  • Page 4 Use the specified refrigerant only. Charge refrigerant from liquid phase of gas cylinder. Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when If the refrigerant is charged from gas phase, composition the unit is being used, serviced, or disposed of.
  • Page 5 [3] Additional refrigerant charge When charging directly from cylinder (1) Check that cylinder for R32/R410A available on the market is a syphon type. (2) Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.) [4] Cautions for unit using R32 refrigerant Basic work procedures are the same as those for conventional units using refrigerant R410A.
  • Page 6 (3) Repair to intrinsically Safe Components Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible voltage and current permitted for the equipment in use. Intrinsically safe components are the only types that can be worked on while live in the presence of a flammable atmos- phere.
  • Page 7 a) Become familiar with the equipment and its operation. b) Isolate system electrically. c) Before attempting the procedure, ensure that: • mechanical handling equipment is available, if required, for handling refrigerant cylinders; • all personal protective equipment is available and being used correctly; •...

  • Page 8: Parts Names And Functions

    Unit Electronic weighing scale [5] Service tools Use the below service tools as exclusive tools for R32/R410A refrigerant. Refer to the spec name plate on outdoor unit for the type of refrigerant being used. Tool name Specifications · Use the existing fitting specifications . (UNF1/2) Gauge manifold ·...

  • Page 9: Specifications

    SPECIFICATIONS Service Ref. PCA-M71HA2(-ET/ER) Mode Cool Heat Power supply (phase, frequency, voltage) Single phase, 50 Hz, 230 V Input 0.10 Running current 0.43 Starting current 0.86 External finish Stainless steel Heat exchanger Plate fin coil Fan (drive) × No. Sirocco fan (direct) × 2 Fan motor output 0.04 Airflow (Low-High)

  • Page 10: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: mm OCH753A...

  • Page 11: Wiring Diagram

    WIRING DIAGRAM OCH753A...

  • Page 12: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM Strainer Heat exchanger Refrigerant GAS pipe connection (Flare) Condenser/evaporator temperature thermistor (TH5) Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection (Flare) Pipe temperature thermistor/liquid Room temperature (TH2) thermistor (TH1) Strainer Distributor with strainer TROUBLESHOOTING 9-1.
  • Page 13 9-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER Refer to "12-8. SELF-DIAGNOSIS" to search for the error history. Check code [Output pattern A] Errors detected by indoor unit Check code Symptom Remark Intake sensor error Pipe (TH2) sensor error Pipe (TH5) sensor error E6, E7 Indoor/outdoor unit communication error Freezing/Overheating safeguard operation...
  • Page 14 Note: Errors to be detected in outdoor unit, such as codes starting with F, U or E (excluding E0 to E7), are not covered in this document. Please 9-3. SELF-DIAGNOSIS ACTION TABLE refer to the outdoor unit's service manual for the details. Check Code Abnormal point and detection method Cause Judgment and action...
  • Page 15 Check Code Abnormal point and detection method Cause Judgment and action Pipe temperature Slight temperature difference – Check pipe <liquid or condenser/evapora- <Cool mode> between indoor room tor> temperature with room temperature Detected as abnormal when the pipe tem- temperature and pipe <liquid display on remote controller and outdoor perature is not in the cooling range 3 min- or condenser/ evaporator>...
  • Page 16 Check Code Abnormal point and detection method Cause Judgment and action Remote controller transmission 2 remote controllers are set as Set a remote controller to main, and the error(E3)/signal receiving error(E5) “main.” other to sub. Abnormal if remote controller could not (In the case of 2 remote con- find blank of transmission path for 6 trollers)
  • Page 17 9-4. TROUBLESHOOTING BY INFERIOR PHENOMENA Note: Refer to the manual of outdoor unit for the detail of remote controller. Phenomena Cause Countermeasure (1) LED2 on indoor controller board • When LED1 on indoor controller board is also off. Power supply of rated voltage is not supplied to Check the voltage of outdoor power is off.
  • Page 18 Note: Refer to the outdoor unit's service manual for the detail of remote controller. Phenomena Cause Countermeasure (2) LED2 on indoor controller board • When LED1 on indoor controller board is also blinking. Check indoor/outdoor unit connecting is blinking. Connection failure of indoor/outdoor unit connecting wire for connection failure.
  • Page 19 9-6. HOW TO CHECK THE PARTS Parts name Checkpoints Room temperature Disconnect the connector then measure the resistance with a multimeter. thermistor (TH1) (At the ambient temperature 10 to 30°C) Pipe temperature thermistor/liquid (TH2) Refer to the <Thermistor Characteristic Graph> below. Condenser/evaporator temperature thermistor (TH5)
  • Page 20 9-7. TEST POINT DIAGRAM Indoor controller board LED2 CN44 Power supply : Pipe temperature thermistor/Liquid (R.B) : Condenser/evaporator temperature thermistor CN22 FUSE Remote controller (6.3 A 250 V) connecting wire – (10.4 – 14.6 VDC) CN20 CN3C Room temperature Transmission thermistor (TH1) (Indoor/outdoor) (0–24 VDC)
  • Page 21 9-8. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE Each function is controlled by the DIP switch and the jumper wire on controller board. SW1 and SW2 are equipped only for service parts. Model setting and capacity setting are preset in the nonvolatile memory of the controller board of the unit. ■...

  • Page 22: Special Function

    SPECIAL FUNCTION 10-1. ROTATION FUNCTION (AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION) Note that this function is not available for SUZ, MXZ, and PUMY models. 10-1-1. Operation (1) Rotation function (and Back-up function) • Outline of functions · Main and sub unit operate according to the interval of rotation setting. Main and sub unit should be set by refrigerant address.
  • Page 23 • System constraint · This function is available only in cool mode. [2nd stage cut-in function] E.g.) Set temp. by R/C = 20˚C Set point = 26˚C Room temp. ] Set point Room temp. < Set point −4°C Start operation Sub unit start operation Sub unit stop Main...

  • Page 24: Disassembly Procedure

    DISASSEMBLY PROCEDURE : Indicates the visible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the oil filter Figure 1 (1) Slide the oil filter towards you to remove. (See Figure 1) Oil filter 2. Removing the terminal block box cover Photo 1 Filter rails (1) Remove the oil filter.
  • Page 25 OPERATING PROCEDURE PHOTOS/FIGURES Photo 4 4. Removing the fan motor (1) Remove the oil filter. (See Figure 1) (2) Remove the control box cover. (See Photo 2) Filter rail (3) Remove the room temperature thermistor connector (CN20) on the indoor controller board. (See Photo 3) (4) Remove a filter rail that is the nearest to the control box.
  • Page 26 OPERATING PROCEDURE PHOTOS/FIGURES Photo 8 6. Removing the pipe temperature thermistor Relay connector (1) Remove the oil filter. (See Figure 1) (2) Remove the fan guard. (See Photo 1) (3) Remove the terminal block box cover. (4) Remove the white relay connector (2P) in the terminal block box.
  • Page 27 OPERATING PROCEDURE PHOTOS/FIGURES Photo 13 9. Removing the guide vane (1) Remove the oil filter. (See Figure 1) Guide vanes (2) Remove the 2 filter rails. (See Photo 1, 4) (3) Remove the under panel. (See Photo 11) (4) Remove the drain pan. (See Photo 12) (5) Remove the 2 screws (4 ×...

  • Page 28: Remote Controller

    REMOTE CONTROLLER 12-1. REMOTE CONTROLLER FUNCTIONS <PAR-41MAA> Controller interface The functions of the function buttons change depending on the screen. Refer to the button function guide that appears at the bottom of the LCD for the functions they serve on a given screen. When the system is centrally controlled, the button function guide that corresponds to the locked button will not appear.
  • Page 29 Display The main display can be displayed in two different modes: ˝Full˝ and ˝Basic˝. The initial setting is ˝Full˝. To switch to the ˝Basic˝ mode, change the setting on the Main display setting. (Refer to operation manual included with remote controller.) <Full mode>...
  • Page 30 Menu structure Main menu Press the button. Move the cursor to the desired item with the buttons, and press the button. Operation Vane · 3D i-See · Vent. (Lossnay) High power Comfort Manual vane angle 3D i-See sensor Vertical air direction Horizontal air direction Timer menu Timer...
  • Page 31 Continue from the previous page. Maintenance menu Error information Filter information Cleaning Auto descending panel Descending operation Descending adjustment Service menu Test run menu Test run Drain pump test run Maintenance information Collect model names and serial No. Model name input Serial No.
  • Page 32 Main menu list Main Setting and display items Setting details menu Operation Vane · 3D i-See · Vent. Vane: Use to set the vertical air direction. (Vane.Vent. (Lossnay)) Louver: Use to set the horizontal air direction. 3D i-See sensor: This setting is available only for the air conditioners that support easy setting function of motion sensing air direction.
  • Page 33 Main Setting and display items Setting details menu Initial Basic Main/Sub When connecting 2 remote controllers, one of them needs to be designated as setting setting a sub controller. Clock Use to set the current time. Daylight Set the daylight saving time. saving time Administrator The administrator password is required to make the settings for the following...
  • Page 34 <PAR-SL97A-E> Controller interface Transmission area Transmission indicator Remote controller display Timer indicator *For explanation purposes, all of the items that appear in the display are shown. *All items are displayed when the Reset button is pressed. Operation areas ON/OFF button Temperature setting buttons Fan Speed button (Changes fan speed) Timer Off button...
  • Page 35 <PAR-SL101A-E> Controller interface Transmission area Remote controller display Set Temperature buttons OFF/ON button Mode button (Changes operation mode) Fan Speed button (Changes fan speed) Airflow button (Changes up/ i-see button* down airflow direction) Timer ON button Menu button Timer OFF button SET/SEND button Weekly timer ON/OFF button* CANCEL button...
  • Page 36 12-2. ERROR INFORMATION When an error occurs, the following screen will appear. Check the error status, stop the operation, and consult your dealer. 1. Check code, error unit, refrigerant address, date and time of occur- Error information rence, model name, and serial number will appear. Error code The model name and serial number will appear only if the informa- Error unit...
  • Page 37 • Checking the error information Maintenance menu While no errors are occurring, page 2/2 of the error information can be Error information viewed by selecting ˝Error information˝ from the Maintenance menu. Filter information Errors cannot be reset from this screen. Cleaning Main menu: Cursor...
  • Page 38 12-3. SERVICE MENU Maintenance password is required 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Main Main menu *At the main display, the menu button and select ˝Service˝ to make the maintenance setting. Service 2. When the Service menu is selected, a window will appear asking for the pass- Service menu word.
  • Page 39 12-4. TEST RUN 12-4-1. PAR-41MAA 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Test run Input maintenance info. Settings Check Select ˝Test run˝ with the F1 or F2 button, and press the [ Others ] button. 2.
  • Page 40 12-4-2. PAR-SL97A-E Measure an impedance between the power supply terminal block on the outdoor unit and ground with a 500 V Megger and check that it is equal to or greater than 1.0 MΩ. TEST RUN 1. Turn on the main power to the unit. TEST RUN 2.
  • Page 41 12-5. FUNCTION SETTING 12-5-1. PAR-41MAA Settings menu 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Function setting Rotation setting Select ˝Setting˝ from the Service menu, and press the [ ] button. Service menu: Select ˝Function setting˝, and press the [ ] button.
  • Page 42 Pattern 2 Function setting Ref. address Grp. (1/8) 4. Toggle through the pages with the F3 or F4 button. Mode 1 Mode 2 Mode 3 5. Select the mode number with the F1 or F2 button, and then press the [ Mode 4 button.
  • Page 43 12-5-2. PAR-SL97A-E Functions can be selected with the wireless remote controller. Function selection using wireless remote controller is available only for refriger- ant system with wireless function. Refrigerant address cannot be specified by the wireless remote controller. [Flow of function selection procedure] Flow of function selection procedure The flow of the function selection procedure is shown below.
  • Page 44 12-5-3. PAR-SL101A-E 1. Going to the function select mode Press the button between of 5 seconds. (Start this operation from the status of remote controller display turned off.) [CHECK] is lit and ˝00˝ blinks. (Fig. 1) Press the button to set the ˝50˝. Direct the wireless remote controller toward the receiver of the indoor unit and press the button.
  • Page 45 12-6. ROTATION SETTING Setting method of each function by wired remote controller ■ PAR-4xMAA ("x" represents 1 or later) Settings menu Stop operation Function setting Rotation setting Select "Service" from the Main menu, and press the [ ] button. Service menu: Cursor Select "Settings"...
  • Page 46 12-7. ERROR HISTORY 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Test run Input maintenance info. Settings Check Others Select ˝Check˝ with the F1 or F2 button, and press the [ button. Select ˝Error history˝ with the F1 or F2 button, and press the [ ] button.
  • Page 47 5. Preliminary error history Preliminary error hist. Error Unt# dd/mm/yy Select "Preliminary error hist." from the Error history menu, and press the ] button. 32 preliminary error history records will appear. Error history menu: Page Delete 4 records are shown per page, and the top record on the first page indicates the latest error record.
  • Page 48 12-8. SELF-DIAGNOSIS 12-8-1. PAR-41MAA 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Diagnosis Self check Select ˝Check˝ from the Service menu, Remote controller check and press the [ ] button. Service menu: Select ˝Diagnosis˝ from the Check menu, Cursor and press the [ ] button.
  • Page 49 12-8-2. PAR-SL97A-E When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop. < Malfunction-diagnosis method at maintenance service> Refrigerant [Procedure] address display 1. Press the CHECK button twice. CHECK •...
  • Page 50 12-9. REMOTE CONTROLLER CHECK If operations cannot be completed with the remote controller, diagnose the remote controller with this function. 1. Select ˝Service˝ from the Main menu, Diagnosis and press the [ ] button. Self check Remote controller check Select ˝Check˝ from the Service menu, and press the [ ] button.
  • Page 51 12-10. SMOOTH MAINTENANCE 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Check menu Error history Diagnosis Smooth maintenance Request code Select ˝Check˝ with the F1 or F2 button, and press the [ ] button. Service menu: Cursor Select ˝Smooth maintenance˝...
  • Page 52 ■ Refrigerant address Single refrigerant system Multi refrigerant system (group control) In the case of single refrigerant system, the refrigerant address Up to 16 refrigerant systems (16 outdoor units) can be con- is ˝00˝ and no operation is required. nected as a group by 1 remote controller. To check or set the Simultaneous twin, triple units belong to this category refrigerant addresses.
  • Page 53 OCH753A...
  • Page 54 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN ©Copyright 2021 MITSUBISHI ELECTRIC CORPORATION Issued: Jan. 2022 No. OCH753 REVISED EDITION-A Published: Sep. 2021 No. OCH753 Specifications are subject to change without notice. Made in Japan...

This manual is also suitable for:

Mr. slim pca seriesMr. slim pca-m71ha2-etMr. slim pca-m71ha2-erMr. slim pca-m71 ha rvs

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