Mitsubishi Electric PLA-A12BA Service Manual
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Mitsubishi Electric PLA-A12BA Service Manual

Mitsubishi Electric PLA-A12BA Service Manual

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Indoor unit
[Model names]
PLA-A12BA
PLA-A18BA
PLA-A24BA
PLA-A30BA
PLA-A36BA
PLA-A42BA
Model name
indication
INDOOR UNIT
ON/OFF
TEMP
WIRELESS REMOTE
CONTROLLER
[Service Ref.]
PLA-A12BA PLA-A12BA
PLA-A18BA PLA-A18BA
PLA-A24BA PLA-A24BA
PLA-A30BA PLA-A30BA
PLA-A36BA PLA-A36BA
PLA-A42BA PLA-A42BA
TEMP.
ON/OFF
WIRED REMOTE
CONTROLLER
1
1
1
1
1
1
CONTENTS
1. TECHNICAL CHANGES .......................... 2
2. REFERENCE MANUAL ........................... 2
3. SAFETY PRECAUTION ........................ 3
5. SPECIFICATIONS ................................. 8
6. NOISE CRITERION CURVES ............. 10
8. WIRING DIAGRAM ................................ 13
10. TROUBLESHOOTING ........................ 16
11. SPECIAL FUNCTION .......................... 31
PARTS CATALOG (OCB420)
3 3 2 2 3
October 2007
No. OCH420
REVISED EDITION-A
Revision:
• PLA-A12/18/24/30/36/42BA
1
are added in REVISED
EDITION-A.
• Some descriptions have been
modified.
Please void OCH420.
•
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 PLA-A12BA

  • Page 1: Table Of Contents

    October 2007 No. OCH420 REVISED EDITION-A SERVICE MANUAL Indoor unit [Model names] [Service Ref.] Revision: • PLA-A12/18/24/30/36/42BA PLA-A12BA PLA-A12BA PLA-A12BA are added in REVISED PLA-A18BA PLA-A18BA PLA-A18BA EDITION-A. • Some descriptions have been PLA-A24BA PLA-A24BA PLA-A24BA modified. PLA-A30BA PLA-A30BA PLA-A30BA Please void OCH420.

  • Page 2: Technical Changes

    TECHNICAL CHANGES PLA-A12BA PLA-A12BA PLA-A18BA PLA-A18BA PLA-A24BA PLA-A24BA PLA-A30BA PLA-A30BA PLA-A36BA PLA-A36BA PLA-A42BA PLA-A42BA INDOOR CONTROLLER BOARD(I.B) has been changed(11. SPECIAL FUNCTION is added). REFERENCE MANUAL 2-1. OUTDOOR UNIT SERVICE MANUAL Service Manual No. Service Ref. PUZ-A18/24/30/36/42NHA PUZ-A18/24/30/36/42NHA-BS OC367 PUY-A12/18/24/30/36/42NHA...

  • Page 3: Safety Precaution

    SAFETY PRECAUTION 3-1. ALWAYS OBSERVE FOR SAFTY Before obtaining access to terminal, all supply circuits must be disconnected. 3-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilising refrigerant R410A Use new refrigerant pipes. Do not use refrigerant other than R410A. If other refrigerant (R22 etc.) is used, chlorine in refrige- rant can cause deterioration of refrigerant oil etc.
  • Page 4 [2] Additional refrigerant charge When charging directly from cylinder · Check that cylinder for R410A on the market is syphon type. · Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.) Unit Gravimeter [3] Service tools Use the below service tools as exclusive tools for R410A refrigerant.

  • Page 5: Part Names And Functions

    PART NAMES AND FUNCTIONS Drain pipe Filter Air outlet Liquid pipe Gas pipe i-see sensor (option) Vane Air intake (Intake grille)

  • Page 6: Wired Remote Controller

    Wired remote controller “Sensor” indication Display Section Day-of-Week Displayed when the remote controller sensor is used. Shows the current day of the week. For purposes of this explanation, all parts of the display are shown Time/Timer Display as lit. During actual operation, only “Locked”...

  • Page 7: Wireless Remote Controller

    Wireless remote controller CHECK TEST RUN display Indicate that the unit is being checked or test-run. MODEL SELECT display display Blinks when model is selected. Lights up while the signal is transmitted to the indoor unit when the button is pressed. Temperature setting display Indicates the desired temperature setting which is set.

  • Page 8: Specifications

    SPECIFICATIONS Service Ref. PLA-A12BA, PLA-A12BA Power supply (phase, cycle, voltage) Single phase,60Hz, 208/230V Max. Fuse Size Min. Circuit Ampacity External finish (Panel) Munsell 6.4Y 8.9/0.4 Heat exchanger Plate fin coil Fan (drive) Turbo fan (direct) Fan motor output 0.05 Fan motor F.L.A.

  • Page 9: Noise

    Service Ref. PLA-A30BA, PLA-A30BA Power supply (phase, cycle, voltage) Single phase,60Hz, 208/230V Max. Fuse Size Min. Circuit Ampacity External finish (Panel) Munsell 6.4Y 8.9/0.4 Heat exchanger Plate fin coil Fan (drive) Turbo fan (direct) Fan motor output 0.05 Fan motor F.L.A.

  • Page 10: Noise Criterion Curves

    NOISE CRITERION CURVES PLA-A12BA PLA-A18BA NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High PLA-A12BA PLA-A18BA Medium1 Medium1 Medium2 Medium2 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 HEARING FOR NC-20...
  • Page 11 PLA-A36BA PLA-A42BA NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High PLA-A36BA PLA-A42BA Medium1 Medium1 Medium2 Medium2 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 HEARING FOR NC-20 NC-20 CONTINUOUS CONTINUOUS NOISE NOISE 1000...

  • Page 12: Outlines And Dimensions

    OUTLINES AND DIMENSIONS INDOOR UNIT PLA-A12BA PLA-A18BA PLA-A24BA PLA-A30BA PLA-A36BA PLA-A42BA PLA-A12BA PLA-A18BA PLA-A24BA PLA-A30BA PLA-A36BA PLA-A42BA Ceiling hole Unit : inch(mm) 25/32 to 1-25/32(20~45) 25/32 to 1-25/32(20~45) 33-27/32 to 35-13/16(860~910) 31-7/8(810) Fresh air Suspension bolt pitch Detail connecting of Branch duct(Both aspects)

  • Page 13: Wiring Diagram

    WIRING DIAGRAM INDOOR UNIT PLA-A12BA PLA-A18BA PLA-A24BA PLA-A30BA PLA-A36BA PLA-A42BA [LEGEND] SYMBOL NAME SYMBOL NAME INDOOR CONTROLLER BOARD FAN MOTOR CN2L CONNECTOR (LOSSNAY) VANE MOTOR CN32 CONNECTOR (REMOTE SWITCH) TERMINAL BLOCK (INDOOR/OUTDOOR CONNECTING LINE) TERMINAL BLOCK (REMOTE CONTROLLER CN41 CONNECTOR (HA TERMINAL-A)
  • Page 14 INDOOR UNIT PLA-A12BA PLA-A18BA PLA-A24BA PLA-A30BA PLA-A36BA PLA-A42BA [LEGEND] SYMBOL NAME SYMBOL NAME INDOOR CONTROLLER BOARD FAN MOTOR CN2L CONNECTOR (LOSSNAY) VANE MOTOR CN24 CONNECTOR<BACK-UP HEATING> TERMINAL BLOCK (INDOOR/OUTDOOR CONNECTING LINE) CN30 CONNECTOR<LLC> TERMINAL BLOCK (REMOTE CONTROLLER CN32 CONNECTOR (REMOTE SWITCH)

  • Page 15: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PLA-A12BA PLA-A18BA PLA-A24BA PLA-A30BA PLA-A36BA PLA-A42BA PLA-A12BA PLA-A18BA PLA-A24BA PLA-A30BA PLA-A36BA PLA-A42BA Strainer (#50) Heat exchanger Refrigerant GAS pipe connection (Flare) Thermistor TH5 (Cond./ Eva. temperature) Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection...

  • Page 16: 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 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 17 10-2. 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 18: Continuous

    • 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 19: Continuous

    • 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. (Refer to the previous page, check code.) • If the unit cannot be operated properly after the test run, refer to the following table to find out the cause. Symptom Cause Wired remote controller...

  • Page 20: Continuous

    Note: Refer to the manual of outdoor unit for the details of display 10-3. SELF-DIAGNOSIS ACTION TABLE such as F, U, and other E. Abnormal point and detection method Countermeasure Error Code Cause Room temperature thermistor (TH1) Defective thermistor – Check resistance value of thermistor.
  • Page 21 Abnormal point and detection method Countermeasure Error Code Cause Freezing/overheating protection is work- (Cooling or drying mode) (Cooling or drying mode) Clogged filter (reduced airflow) Check clogs of the filter. Freezing protection (Cooling mode) Short cycle of air path Remove shields. The unit is in 6-minute resume prevention Low load (low temperature) mode if pipe <liquid or condenser/evapo-...

  • Page 22: Noise

    Abnormal point and detection method Countermeasure Error Code Cause Pipe temperature thermistor / Defective thermistor – Check resistance value of thermistor. Condenser-Evaporator (TH5) characteristics For characteristics, refer to (P1) above. The unit is in 3-minute resume protec- Check contact failure of connector (CN44) on Contact failure of connector the indoor controller board.

  • Page 23: Continuous

    Abnormal point and detection method Countermeasure Error Code Cause Remote controller transmission Set a remote controller to main, and the other to sub. error(E3)/signal receiving error(E5) 2 remote controllers are set as “main.” Abnormal if remote controller could not find blank of transmission path for 6 sec- (In case of 2 remote con- onds and could not transmit.
  • Page 24 10-4. 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. Power supply of rated voltage is not supplied to out- Check the voltage of outdoor power door unit.
  • Page 25 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 26: Continuous

    10-5. EMERGENCY OPERATION 10-5-1. When wireless remote controller troubles or its battery is exhausted When the remote controller cannot be used When the batteries of the remote controller run out or the remote control- ler malfunctions, the emergency operation can be done using the emer- gency buttons on the grille.
  • Page 27 10-6. HOW TO CHECK THE PARTS PLA-A12BA PLA-A18BA PLA-A24BA PLA-A30BA PLA-A36BA PLA-A42BA PLA-A12BA PLA-A18BA PLA-A24BA PLA-A30BA PLA-A36BA PLA-A42BA Parts name Check points Room temperature Disconnect the connector then measure the resistance with a tester. thermistor (TH1) (At the ambient temperature of 10˚C[50˚F]~30˚C[86˚F])
  • Page 28 10-6-1. Thermistor <Thermistor Characteristic graph> <Thermistor for lower temperature> Room temperature thermistor(TH1) Thermistor for Pipe temperature thermistor/liquid(TH2) lower temperature Condenser/evaporator temperature thermistor(TH5) Thermistor R =15k ± 3% Fixed number of B=3480 ± 2% t( )Rt=15exp { 3480( 273+t T-32 273+ -20 -10 0 10 20 30 40 50 -4 -14 32 50 68 86 104122 F Temperature...
  • Page 29 10-7.TEST POINT DIAGRAM Indoor controller board PLA-A12BA PLA-A18BA PLA-A24BA PLA-A30BA PLA-A36BA PLA-A42BA PLA-A12BA PLA-A18BA PLA-A24BA PLA-A30BA PLA-A36BA PLA-A42BA CN90 LED3 Connect to the wireless Transmission Vane motor output (MV) remote controller board (Indoor/outdoor) 12V pulse output (CNB) CN4Y i-see sensor...
  • Page 30 MODELS Service MODELS Service Capacity 1 2 3 4 5 1 2 3 4 5 PLA-A12BA PLA-A30BA settings 1 2 3 4 5 1 2 3 4 5 PLA-A18BA PLA-A36BA 1 2 3 4 5 1 2 3 4 5...

  • Page 31: Special Function

    SPECIAL FUNCTION 11-1. ROTATION FUNCTION(AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION) 11-1-1. Operation (1) Rotation function(and Back-up function) Outline of functions · Operating the unit of main and sub alternately according to the interval setting. (Rotation function) The setting of main/sub unit depends on the refrigerant address.(The setting of dip switch on the outdoor unit) Refrigerant address"00"...
  • Page 32 11-1-2.How to perform the operation of rotation function(Back-up function, 2nd stage cut-in function) Set by wired remote controller.(Maintenance monitor) NOTICE It is necessary to set the same content to both main unit and sub unit. Every time indoor controller board is replaced for servicing, it is necessary to set each function. (1) Request Code List Rotation setting Setting No.
  • Page 33 (2) Setting method of each function by wired remote controller B: Refrigerant address C: Data display area D: Request code display area 1. Stop running the air-conditioner( ). 2. Press the TEST button ( ) for 3 seconds so that [Maintenance mode] appears on the screen (at After a while, [00] appears in the refrigerant address number display area.(at 3.

  • Page 34: Disassembly Procedure

    DISASSEMBLY PROCEDURE PLA-A12BA PLA-A18BA PLA-A24BA PLA-A30BA PLA-A36BA PLA-A42BA PLA-A12BA PLA-A18BA PLA-A24BA PLA-A30BA PLA-A36BA PLA-A42BA Be careful on remov- ing heavy parts. OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 1. Removing the air intake grille Figure 1 (1) Slide the knob of air intake grille toward the arrow Filter open the air intake grille.
  • Page 35 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 5. Removing the fan and fan motor (MF) Coil plate Photo 3 (1) Remove the electrical box. (See photo 2) (2) Remove the bell mouth (3 screws). (See photo 2) (3) Remove the turbo fan nut. (4) Pull out the turbo fan.
  • Page 36 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN New publication, effective Oct. 2007 Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Specifications subject to change without notice. Distributed in Oct. 2007 No.OCH420 REVISED EDITION-A PDF 9 Distributed in Jul.

This manual is also suitable for:

Pla-a18baPla-a24baPla-a30baPla-a36baPla-a42ba

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