Mitsubishi Electric Mr. Slim PKA Series Service Manual
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Mitsubishi Electric Mr. Slim PKA Series Service Manual

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Indoor unit
[Model Name]
PKA-M35HA
PKA-M35HA-ER
PKA-M50HA
PKA-M50HA-ER
PKA-M35HAL
PKA-M35HAL-ER
PKA-M50HAL
PKA-M50HAL-ER
INDOOR UNIT
[Service Ref.]
PKA-M35HA
PKA-M35HA-ER
PKA-M50HA
PKA-M50HA-ER
PKA-M35HAL
PKA-M35HAL-ER
PKA-M50HAL
PKA-M50HAL-ER
R32/R410A
CONTENTS
1. REFERENCE MANUAL ................................... 2
2. SAFETY PRECAUTION ................................... 3
3. PARTS NAMES AND FUNCTIONS ................. 8
4. SPECIFICATIONS ........................................... 13
5. NOISE CRITERION CURVES ......................... 14
6. OUTLINES AND DIMENSIONS ...................... 15
7. WIRING DIAGRAM ......................................... 16
9. TROUBLESHOOTING .................................... 19
10. FUNCTION SETTING .................................... 35
11. SPECIAL FUNCTION ..................................... 36
12. DISASSEMBLY PROCEDURE ....................... 38
PARTS CATALOG (OCB660)
November 2018
No. OCH660
REVISED EDITION-A
Notes:
• Added
PKA-M35HA-ER,
PKA-M50HA-ER,
PKA-M35HAL-ER, and
PKA-M50HAL-ER
in REVISED EDITION-A.
OCH660 is void.

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Summary of Contents for Mitsubishi Electric Mr. Slim PKA Series

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS November 2018 No. OCH660 REVISED EDITION-A SERVICE MANUAL R32/R410A Notes: Indoor unit • Added [Model Name] [Service Ref.] PKA-M35HA-ER, PKA-M50HA-ER, PKA-M35HA PKA-M35HA PKA-M35HAL-ER, and PKA-M50HAL-ER PKA-M35HA-ER PKA-M35HA-ER in REVISED EDITION-A. OCH660 is void. PKA-M50HA PKA-M50HA PKA-M50HA-ER...

  • Page 2: Reference Manual

    REFERENCE MANUAL OUTDOOR UNIT’S SERVICE MANUAL Model name Service Ref. Service manual No. PUZ-ZM35/50VKA PUZ-ZM35/50VKA(-ET) OCH653 PUZ-ZM71VHA PUZ-ZM71VHA(-ET) OCB653 PUZ-ZM100VKA PUZ-ZM100VKA.UK PUZ-ZM140VKA PUZ-ZM140VKAR1.UK OCH654 PUZ-ZM100YKA PUZ-ZM100YKA.UK OCB654 PUZ-ZM140YKA PUZ-ZM140YKAR1.UK PUZ-M100VKA PUZ-M100VKA PUZ-M140VKA PUZ-M140VKA OCH707 OCB707 PUZ-M100YKA PUZ-M100YKA PUZ-M140YKA PUZ-M140YKA PUHZ-ZRP35/50VKA2 PUHZ-ZRP35/50VKA2(-ER/ET) OCH635 PUHZ-ZRP71VHA2...

  • 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 [1] Warning for service (1) Do not alter the unit. (2) For installation and relocation work, follow the instructions in the Installation Manual and use tools and pipe components specifically made for use with refrigerant specified in the outdoor unit installation manual. (3) Ask a dealer or an authorized technician to install, relocate and repair the unit.
  • Page 5 [4] Cautions for unit using R32 refrigerant Basic work procedures are the same as those for conventional units using refrigerant R410A. However, pay careful attention to the following points. (1) Information on servicing (1-1) Checks on the Area Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the risk of ignition is minimized.
  • 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 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; • the recovery process is supervised at all times by a competent person; •...

  • 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. Specifications Tool name · Use the existing fitting specifications . (UNF1/2) Gauge manifold · Use high-tension side pressure of 5.3MPa·G or over. Charge hose ·...
  • Page 9 3-2. Wireless remote controller (Option for HA model) CHECK TEST RUN display CHECK and TEST RUN display indicate that the unit is being checked or test-run. MODEL SELECT display Blinks when model is selected. display Lights up while the signal is transmitted to the indoor unit when the button is pressed.
  • Page 10 3-3. WIRED REMOTE CONTROLLER (OPTION) <PAR-33MAA> The functions which can be used are restricted according to each model. The main display can be displayed in 2 different modes: "Full" and "Basic." Display The initial setting is "Full." 1 Operation mode Appears when the On/Off timer or Night setback Indoor unit operation mode appears here.
  • Page 11 Menu structure Press the button. MENU Main menu Move the cursor to the desired item with the buttons, and press the SELECT button. Vane · Louver · Vent. (Lossnay) High power Timer ON/OFF timer Auto-OFF timer Weekly timer OU silent mode Restriction Temp.
  • Page 12 Setting and display items Setting details Vane · Louver · Vent. Use to set the vane angle. • Select a desired vane setting from 5 different settings. (Lossnay) Use to turn ON/OFF the louver. • Select a desired setting from "ON" and "OFF." Use to set the amount of ventilation.

  • Page 13: Specifications

    SPECIFICATIONS Service Ref. PKA-M35HA PKA-M35HA-ER PKA-M35HAL PKA-M35HAL-ER Mode Cooling Heating Power supply (phase, voltage, cycle) Single phase, 230V, 50Hz Input 0.04 0.03 Running current 0.40 0.30 External finish (Panel) Munsell 1.0Y 9.2/0.2 Plate fin coil Heat exchanger Line flow fan (direct) × 1 Fan Fan (drive) ×...

  • Page 14: Noise Criterion Curves

    NOISE CRITERION CURVES 5-1. SOUND LEVELS Sound level at anechoic room : Low-Middle-High Model Sound level dB (A) Main unit PKA-M35/50HA(L) 36 - 40 - 43 Wall 1.0m Measurement location * Measured in anechoic room. 5-2. NOISE CRITERION CURVES 70.0 High 65.0 60.0...

  • Page 15: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PKA-M35HA PKA-M50HA PKA-M35HAL PKA-M50HAL PKA-M35HA-ER PKA-M50HA-ER PKA-M35HAL-ER PKA-M50HAL-ER Unit : mm PKA-RP35,50HAL OCH660A...

  • Page 16: Wiring Diagram

    WIRING DIAGRAM PKA-M35HA PKA-M50HA PKA-M35HA-ER PKA-M50HA-ER OCH660A...
  • Page 17 PKA-M35HAL PKA-M50HAL PKA-M35HAL-ER PKA-M50HAL-ER OCH660A...

  • Page 18: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PKA-M35HA PKA-M50HA PKA-M35HAL PKA-M50HAL PKA-M35HA-ER PKA-M50HA-ER PKA-M35HAL-ER PKA-M50HAL-ER Strainer (#50) Heat exchanger Refrigerant GAS pipe connection (Flare) Thermistor TH2 Refrigerant flow in cooling (Pipe temperature/liquid) Refrigerant flow in heating Thermistor TH5 (Cond./ Eva.temperature) Refrigerant LIQUID pipe connection (Flare) Thermistor TH1 (Room temperature)

  • Page 19: Troubleshooting

    TROUBLESHOOTING 9-1. 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 or controller 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 20 9-2. MALFUNCTION-DIAGNOSIS METHOD BY 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] Refrigerant 1.
  • Page 21 • 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 22 ● If the unit cannot be operated properly after test run, refer to the following table to find the cause. Symptom Cause Wired remote controller LED 1, 2 (PCB in outdoor unit) For about 3 After LED 1, 2 are lit, LED 2 is turned •...
  • Page 23 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 refer to the out- 9-3. SELF-DIAGNOSIS ACTION TABLE door unit's service manual for the details. Abnormal point and detection method Countermeasure Check code...
  • Page 24 Abnormal point and detection method Countermeasure Check code Cause Freezing/overheating protection is work- (Cooling or drying mode) (Cooling or drying mode) 1 Clogged filter (reduced airflow) 1 Check clogs of the filter. 1 Freezing protection (Cooling mode) 2 Short cycle of air path 2 Remove shields.
  • Page 25 Abnormal point and detection method Countermeasure Check code Cause Pipe temperature thermistor/ 1–3 Check resistance value of thermistor. Condenser-Evaporator (TH5) 1 Defective thermistor For characteristics, refer to (P1). 1 The unit is in 3-minute resume protec- characteristics 2 Check contact failure of connector (CN44) 2 Contact failure of connector tion mode if short/open of thermistor is on the indoor controller board.
  • Page 26 Abnormal point and detection method Countermeasure Check code Cause Remote controller transmission error(E3)/signal receiving error(E5) 1 2 remote controllers are set as 1 Set a remote controller to main, and the 1 Abnormal if remote controller could not “main.” other to sub. find blank of transmission path for 6 sec- (In case of 2 remote con- onds and could not transmit.
  • Page 27 Abnormal point and detection method Countermeasure Check code Cause Forced compressor stop 1 Drain pump trouble 1 Check the drain pump. (due to water leakage abnormality) 1 The unit has a water leakage abnor- 2 Defective drainage 2 Check whether water can be drained. mality when the following conditions, a) ·...
  • Page 28 9-4. TROUBLESHOOTING OF PROBLEMS Note: Refer to the outdoor unit's service manual for the detail of remote controller. Phenomena Cause Countermeasure (1)LED2 on indoor controller board • When LED1 on indoor controller board is also off. is off. 1 Power supply of rated voltage is not supplied to out- 1 Check the voltage of outdoor power door unit.
  • Page 29 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. 1 Connection failure of indoor/outdoor unit connecting is blinking. 1 Check indoor/outdoor unit connecting wire wire for connection failure.
  • Page 30 9-5. EMERGENCY OPERATION 9-5-1. When wireless remote controller fails or its battery is exhausted When the remote controller cannot be used When the batteries of the remote controller run out or the remote controller malfunctions, the emergency operation can be done using the emergency buttons.
  • Page 31 9-6. HOW TO CHECK THE PARTS PKA-M35HA PKA-M50HA PKA-M35HAL PKA-M50HAL PKA-M35HA-ER PKA-M50HA-ER PKA-M35HAL-ER PKA-M50HAL-ER Parts name Check points Room temperature Disconnect the connector then measure the resistance with a tester. thermistor (TH1) Pipe temperature Refer to “9-6-1. Thermistor”. thermistor/liquid(TH2) Condenser/evaporator temperature thermistor (TH5) Vane motor (MV) Measure the resistance between the terminals using a tester.
  • Page 32 9-6-2. DC Fan motor (fan motor/indoor controller circuit board) Check method of DC fan motor (fan motor/indoor controller circuit board) 1 Notes · High voltage is applied to the connector (CNMF) for the fan motor. Pay attention to the service. ·...
  • Page 33 9-7. TEST POINT DIAGRAM Indoor controller board PKA-M35HA PKA-M50HA PKA-M35HAL PKA-M50HAL PKA-M35HA-ER PKA-M50HA-ER PKA-M35HAL-ER PKA-M50HAL-ER CNMF Connect to the fan motor (MF) 1–3 : 310–340 V DC 4–3 : 15 V DC 5–3 : 0–6.5 V DC 6–3 : 0 or 15 V DC CN105 CN01 Connect to the...
  • Page 34 9-8. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE Each function is controlled by the DIP switch and the jumper wire on the indoor controller board. ■ The black square ( ) indicates a switch position. Jumper wire Setting by the dip switch and jumper wire Remarks Functions MODELS...

  • Page 35: Function Setting

    FUNCTION SETTING 10-1. 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. (1) Functions available when setting the unit number to 00 Refer to the service manual that comes with each outdoor unit.

  • Page 36: Special Function

    SPECIAL FUNCTION 11-1. ROTATION FUNCTION(AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION) Connect optional wired remote controller through Terminal Block kit (PAC-SH29TC-E) to PKA type. 11-1-1. Operation (1) Rotation function (and Back-up function) • Outline of functions · Main and sub unit operate alternately according to the interval of rotation setting. Main and sub unit should be set by refrigerant address.
  • Page 37 • System constraint · This function is available only in cooling mode. Ex.) Set temp. by R/C = 20: [2nd stage cut-in function]··· Request code number "322–324" Set point = 26: Room temp. ] Set point Room temp. < Set point -4: When request code number is “323”.

  • Page 38: Disassembly Procedure

    DISASSEMBLY PROCEDURE PKA-M35HA PKA-M50HA PKA-M35HAL PKA-M50HAL PKA-M35HA-ER PKA-M50HA-ER PKA-M35HAL-ER PKA-M50HAL-ER Be careful when removing heavy parts. : Indicates the visible parts in the photos/figures. OPERATION PROCEDURE PHOTOS & FIGURES 1. Removing the lower side of the indoor unit from the Figure 1 installation plate (1) Remove the front panel.
  • Page 39 OPERATION PROCEDURE PHOTOS & FIGURES 3. Removing the indoor controller board and wireless Photo 3 controller board Electrical box cover (top) Electrical box Screw (side cover) cover (side) Screw (top cover) (1) Remove the front panel. (Refer to procedure 2.) (2) Remove the room temp.
  • Page 40 OPERATION PROCEDURE PHOTOS & FIGURES Electrical box cover (side) 5. Removing the nozzle assembly (with vane and vane Photo 8 Electrical box cover (top) motor) and drain hose Screw (side cover) Screw (top cover) (1) Remove the front panel (Refer to procedure 2.). (2) Remove the electrical box cover.
  • Page 41 OPERATION PROCEDURE PHOTOS & FIGURES 9. Removing the heat exchanger Photo 14 Electrical box cover (side) Electrical box cover (top) (1) Remove the front panel (Refer to procedure 2.) and the Heat exchanger Screw (side cover) corner panel at right lower side. Screw (top cover) Water cover (2) Remove the electrical box (Refer to procedure 4.) and the...
  • Page 42 HEAD OFFICE : TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2017 MITSUBISHI ELECTRIC CORPORATION Issued: Nov. 2018 No. OCH660 REVISED EDITION-A Published: Mar. 2017 No. OCH660 Specifications are subject to change without notice. Made in Japan...

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