Mitsubishi Electric PKA Series Service Manual
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Mitsubishi Electric PKA Series Service Manual

Wall mounted mr.slim pka-rp35hal; pka-rp50hal; r410a
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS

SERVICE MANUAL

Indoor unit
[Model names]
[Service Ref.]
PKA-RP35HAL
PKA-RP35HAL
PKA-RP50HAL
PKA-RP50HAL
INDOOR UNIT
CONTENTS
1. REFERENCE MANUAL ................................... 2
2. SAFETY PRECAUTION ................................... 3
3. PART NAMES AND FUNCTIONS ................... 4
4. SPECIFICATIONS ............................................ 6
5. NOISE CRITERION CURVES .......................... 7
6. OUTLINES AND DIMENSIONS ....................... 8
7. WIRING DIAGRAM .......................................... 9
9. TROUBLESHOOTING .................................... 11
10. SPECIAL FUNCTION ..................................... 26
11. DISASSEMBLY PROCEDURE ....................... 29
PARTS CATALOG (OCB453)
March 2009
No. OCH453
NOTE:
• This manual describes
only service data of the
indoor units.
• RoHS compliant products
have <G> mark on the
spec name plate.

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Summary of Contents for Mitsubishi Electric PKA Series

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS March 2009 No. OCH453 SERVICE MANUAL Indoor unit [Model names] [Service Ref.] NOTE: • This manual describes PKA-RP35HAL PKA-RP35HAL only service data of the indoor units. • RoHS compliant products PKA-RP50HAL PKA-RP50HAL have <G>...

  • Page 2: Reference Manual

    REFERENCE MANUAL OUTDOOR UNIT’S SERVICE MANUAL Service Manual No. Service Ref. PUHZ-RP35/50/60/71VHA4 OCH451 PUHZ-RP100/125/140VKA OCB451 PUHZ-RP100/125/140/200/250YKA PU(H)-P71/100VHA#2.UK OC379 PU(H)-P71/100/125/140YHA#2.UK PUHZ-P100/125/140VHA3.UK OCH415/OCB415 PUHZ-P200/250YHA3 OCH424/OCB424 PUHZ-HRP71/100VHA2 OCH425/OCB425 PUHZ-HRP100/125YHA2...

  • Page 3: Safety Precaution

    SAFETY PRECAUTION 2-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. 2-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilising 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: Part Names And Functions

    Unit Gravimeter [3] Service tools Use the below service tools as exclusive tools for R410A refrigerant. Tool name Specifications Gauge manifold · Only for R410A · Use the existing fitting specifications . (UNF1/2) · Use high-tension side pressure of 5.3MPa·G or over. Charge hose ·...

  • Page 5: Wireless Remote Controller

    Wireless remote controller 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. display SET TEMP.

  • Page 6: Specifications

    SPECIFICATIONS Service Ref. PKA-RP35HAL Mode Cooling Heating Power supply (phase, cycle, voltage) Single phase, 50Hz, 230V Input 0.04 0.03 Running current 0.40 0.30 External finish (Panel) Munsell 1.0Y 9.2/0.2 Heat exchanger Plate fin coil Fan (drive) Line flow fan (direct) Fan motor output 0.030 Airflow (Low-Middle-High)

  • Page 7: Noise Criterion Curves

    NOISE CRITERION CURVES 5-1. SOUND LEVELS Sound level at anechoic room : Low-Middle-High Sound level dB (A) PKA-RP35, 50HAL 36 - 40 - 43 1.0m Measurement location * Measured in anechoic room. 5-2. NOISE CRITERION CURVES 70.0 High 65.0 60.0 NC-60 55.0 50.0...

  • Page 8: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PKA-RP35HAL PKA-RP50HAL Unit : mm PKA-RP35,50HAL...

  • Page 9: Wiring Diagram

    WIRING DIAGRAM PKA-RP35HAL PKA-RP50HAL [Explanation of symbols] Symbol Name Symbol Name Indoor controller board Vane motor CN2L Connector (LOSSNAY) Fan motor CN32 Connector ( Remote switch) Switch board CN41 Connector (HA terminal-A) SWE2 Emergency operation CN51 Connector (Centrally control) Terminal block(Indoor unit Power (option)) CN90 Connector (Remote operation adapter) Terminal block (Indoor/outdoor connecting line)

  • Page 10: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PKA-RP35HAL PKA-RP50HAL 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) Strainer (#50) Distributor with strainer (#50/#50)

  • Page 11: Troubleshooting

    TROUBLESHOOTING 9-1. 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 or controller board of outdoor unit. Actions to be taken for service and the trouble reoccurrence at field are summarized in the table below. Check the contents below before investigating details.
  • Page 12 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] 1.
  • Page 13 • 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 flash pattern Approx. 2.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.
  • Page 14 • On wireless remote controller The continuous buzzer sounds from receiving section of indoor unit. Blink of operation lamp • On wired remote controller Check code displayed in the LCD. • If the unit cannot be operated properly after test run, refer to the following table to find the cause. Symptom Cause Wired remote controller...

  • Page 15: Self-Diagnosis Action Table

    Note: Refer to the manual of outdoor unit for the details of display 9-3. SELF-DIAGNOSIS ACTION TABLE such as F, U, and other E. Abnormal point and detection method Countermeasure Error Code Cause 1 Defective thermistor 1–3 Check resistance value of thermistor. Room temperature thermistor (TH1) 1 The unit is in 3-minute resume characteristics...
  • Page 16 Abnormal point and detection method Countermeasure Error 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 17 Abnormal point and detection method Countermeasure Error Code Cause 1 Defective thermistor Pipe temperature thermistor/ 1–3 Check resistance value of thermistor. Condenser-Evaporator (TH5) characteristics 1 The unit is in 3-minute resume protec- For characteristics, refer to (P1) above. 2 Contact failure of connector 2 Check contact failure of connector (CN44) tion mode if short/open of thermistor is (CN44) on the indoor controller...
  • Page 18 Abnormal point and detection method Countermeasure Error Code Cause 1 Contact failure, short circuit or, Indoor/outdoor unit communication * Check LED display on the outdoor control error (Signal receiving error) circuit board. (Connect A-control service miswiring (converse wiring) of 1 Abnormal if indoor controller board tool, PAC-SK52ST.) indoor/outdoor unit connecting cannot receive any signal normally for 6...

  • Page 19: Troubleshooting By Inferior Phenomena

    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. is off. 1 Power supply of rated voltage is not supplied to out- 1 Check the voltage of outdoor power door unit.
  • Page 20 Note: Refer to the manual of outdoor unit 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 wire is blinking. Connection failure of indoor/outdoor unit connecting for connection failure.

  • Page 21: Emergency Operation

    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 22 9-6. HOW TO CHECK THE PARTS PKA-RP35HAL PKA-RP50HAL Parts name Check points Room temperature Disconnect the connector then measure the resistance using a tester. thermistor (TH1) (At the ambient temperature 10 ~30 ) Liquid pipe temperature Normal Abnormal thermistor (TH2) Refer to the thermistor.
  • Page 23 9-6-2. DC Fan motor (fan motor/indoor controller circuit board) Check method of DC fan motor (fan motor/indoor controller circuit board) Notes · High voltage is applied to the connecter (CNMF) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNMF) for the motor with the power supply on. board and fan motor.) (It causes trouble of the indoor controller circuit Self check...
  • Page 24 9-7. TEST POINT DIAGRAM Indoor controller board PKA-RP35HAL PKA-RP50HAL CNMF Connect to the fan motor (MF) 1-3 : DC310~340V 4-3 : DC15V 5-3 : DC0~6.5V 6-3 : DC0 or DC15V CN01 Connect to the Terminal block (TB4) 1-3 : 220-240VAC Emergency FUSE operation connector...
  • Page 25 9-8. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE Each function is controlled by the dip switch and the jumper wire on control P.C. board. (Marks in the table below) Jumper wire ( : Short : Open) Jumper wire Setting by the dip switch and jumper wire Functions Remarks MODELS...

  • Page 26: Special Function

    SPECIAL FUNCTION 10-1. ROTATION FUNCTION(AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION) Optional wired remote controller with terminal bed (PAR-21MAAT-E) are necessary for PKA type. 10-1-1. Operation (1) Rotation function (and Back-up function) • Outline of functions · Main and sub unit operate alternately according to the interval of rotation setting. w Main and sub unit should be set by refrigerant address.
  • Page 27 • System constraint · This function is available only in cooling mode. [2nd stage cut-in function]··· Request code number "322~324" Ex.) Set temp. by R/C = 20: Set point = 26: Room temp. Set point Room temp. < Set point -4 When request code number is “323”.
  • Page 28 (2) Setting method of each function by wired remote controller B: Refrigerant address C: Data display area D: Request code display area 1. Stop operation( ). 2. Press the button ( ) for 3 seconds so that [Maintenance mode] appears on the screen ( ). TEST After a while, [00] appears in the refrigerant address number display area.(at 3.

  • Page 29: Disassembly Procedure

    DISASSEMBLY PROCEDURE PKA-RP35HAL PKA-RP50HAL Be careful when removing heavy parts. OPERATION PROCEDURE PHOTOS & ILLUSTRATIONS 1. REMOVING THE LOWER SIDE OF THE INDOOR Figure 1 UNIT FROM THE INSTALLATION PLATE (1) Remove the front panel. (2) Insert the screw driver to the corner hole at both left and right side as shown in the figure 1.

  • Page 30: Operation Procedure

    OPERATION PROCEDURE PHOTOS 3. REMOVING THE INDOOR CONTROLLER BOARD Photo 3 AND WIRELESS CONTROLLER BOARD Electrical box cover (top) Electrical box Screw (side cover) cover (side) Screw (top cover) (1) Remove the front panel. (Refer to 2.) (2) Remove the room temp. thermistor TH1. (see Photo 3) (3) Remove the electrical box covers (screw 4 ×...
  • Page 31 OPERATION PROCEDURE PHOTOS Electrical box cover (side) 5. REMOVING THE NOZZLE ASSEMBLY (with VANE Photo 8 Electrical box cover (top) and VANE MOTOR) AND DRAIN HOSE Screw (side cover) Screw (top cover) (1) Remove the front panel (Refer to 2.). (2) Remove the electrical box cover.
  • Page 32 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN New publication, effective Mar. 2009 CCopyright 2009 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Specifications subject to change without notice Distributed in Mar. 2009 No.OCH453 PDF 7 Made in Japan...

This manual is also suitable for:

PkaPka-rp35halPka-rp50hal

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