Mitsubishi Electric Mr.SLIM PCA-A24GA Service Manual
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Mitsubishi Electric Mr.SLIM PCA-A24GA Service Manual

Mitsubishi Electric Mr.SLIM PCA-A24GA Service Manual

Split-type, heat pump air conditioners and split-type, air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS

SERVICE MANUAL

Indoor unit
[Model names]
PCA-A24GA
PCA-A30GA
PCA-A36GA
PCA-A42GA
INDOOR UNIT
TEMP.
REMOTE CONTROLLER
[Service Ref.]
PCA-A24GA
PCA-A24GA
1
PCA-A24GA
2
PCA-A30GA
PCA-A30GA
1
PCA-A30GA
2
PCA-A36GA
PCA-A36GA
1
PCA-A36GA
2
PCA-A42GA
PCA-A42GA
1
PCA-A42GA
2
Model name
indication
ON/OFF
CONTENTS
1. TECHNICAL CHANGES ··································2
2. REFERENCE MANUAL ······································2
3. SAFETY PRECAUTION···································3
4. PART NAMES AND FUNCTIONS ···················5
5. SPECIFICATIONS ············································8
6. NOISE CRITERION CURVES ··························9
7. OUTLINES AND DIMENSIONS ·····················10
8. WIRING DIAGRAM············································12
9. REFRIGERANT SYSTEM DIAGRAM ··················14
10. TROUBLESHOOTING ···································15
11. SPECIAL FUNCTION ·····································26
12. DISASSEMBLY PROCEDURE ······················29
13. PARTS LIST ···················································34
14. RoHS PARTS LIST ········································37
3 3 2 2 3
October 2007
No. OC368
REVISED EDITION-C
Revision:
• PCA-A24/30/36/42GA
2
are added in REVISED
EDITION-C.
• Some descriptions have
been modified.
• Please void OC368
REVISED EDITION-B
.
NOTE:
• This manual describes
only service data of the
indoor units.
• RoHS compliant products
have <G> mark on the
spec name plate.
• For servicing RoHS com-
pliant products, refer to
the RoHS PARTS LIST.

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Summary of Contents for Mitsubishi Electric Mr.SLIM PCA-A24GA

  • Page 1: Table Of Contents

    October 2007 No. OC368 REVISED EDITION-C SERVICE MANUAL Revision: Indoor unit • PCA-A24/30/36/42GA [Model names] [Service Ref.] are added in REVISED EDITION-C. PCA-A24GA PCA-A24GA • Some descriptions have PCA-A24GA been modified. PCA-A24GA • Please void OC368 PCA-A30GA PCA-A30GA REVISED EDITION-B PCA-A30GA...

  • Page 2: Technical Changes

    TECHNICAL CHANGES PCA-A24GA PCA-A24GA PCA-A30GA PCA-A30GA PCA-A36GA PCA-A36GA PCA-A42GA PCA-A42GA • Indoor controller board(I.B) has been changed(11.SPECIAL FUNCTION is added). PCA-A24GA PCA-A24GA PCA-A30GA PCA-A30GA PCA-A36GA PCA-A36GA PCA-A42GA PCA-A42GA • Indoor controller board(I.B) has been changed. REFERENCE MANUAL 2-1. OUTDOOR UNIT SERVICE MANUAL Service Manual No.

  • Page 3: Safety Precaution

    SAFETY PRECAUTION 3-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminals, 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 Indoor Unit Left/right guide vanes Change the direction of airflow from the horizontal blower. Air outlet Long-life filter Removes dust and foreign matter from air coming in through the grille (Recommended cleaning interval : Approx. every 2,500 operating hours) Air intake Up/down guide vanes Intake grille...
  • Page 6 Wired remote controller Display Section Day-of-Week “Sensor” indication For purposes of this explanation, Shows the current day of the week. Displayed when the remote controller all parts of the display are shown sensor is used. as lit. During actual operation, only the relevant items will be lit.

  • Page 7: Wireless Remote Controller

    Wireless remote controller display CHECK TEST RUN Indicate that the unit is being checked or test-run. display display MODEL SELECT 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 PCA-A24GA, PCA-A24GA , PCA-A24GA Service Ref. Power supply(phase, cycle, voltage) Single phase, 60Hz, 208/230V Max. Fuse Size Min.Circuit Ampacity External finish Munsell 0.70Y 8.59/0.97 Plate fin coil Heat exchanger Sirocco fan (direct) o 3 Fan(drive) o No. Fan motor output 0.070...

  • Page 9: Noise Criterion Curves

    Remote controller & built-in Noise level(Low-Medium2-Medium1-High) 40-41-43-45 mm(in.) Field drain pipe O.D. 26(1-1/32) mm(in.) Dimensions 1,310(51-9/16) mm(in.) 680(26-25/32) mm(in.) 270(10-5/8) kg(lbs) Weight 37(82) NOISE CRITERION CURVES PCA-A24GA PCA-A36GA PCA-A36GA PCA-A24GA NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High PCA-A30GA PCA-A42GA PCA-A42GA PCA-A30GA Medium1...

  • Page 10: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PCA-A24GA PCA-A24GA PCA-A24GA Unit : inch(mm) PCA-A30GA PCA-A30GA PCA-A30GA NOTES: Use M10 or W3/8 screw for anchor bolt. MODEL 24/30 5 Liquid pipe 3/8 inch 5-1/2(140) 2-3/4(70) 4 Gas pipe 5/8 inch 48-13/16(1240) (Suspension bolt pitch) 3-7/16(87)
  • Page 11 PCA-A36GA PCA-A36GA PCA-A36GA Unit : inch(mm) PCA-A42GA PCA-A42GA PCA-A42GA NOTES: Use M10 or W3/8 screw for anchor bolt. 5-1/2(140) 2-3/4(70) MODEL 36/42 5 Liquid pipe 3/8 inch 4 Gas pipe 5/8 inch 48-13/16(1240) (Suspension bolt pitch) 3-7/16(87) 50-13/16(1290) 5/8(16) 7-3/16(182) liquid Air outlet 47-13/16(1214)

  • Page 12: Wiring Diagram

    WIRING DIAGRAM PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA [LEGEND] SYMBOL NAME SYMBOL NAME SYMBOL NAME INDOOR POWER BOARD CAPACITOR<FAN MOTOR> WIRELESS REMOTE CONTROLLER BOARD(OPTION) INDOOR CONTROLLER BOARD FAN MOTOR RECEIVING UNIT FUSE FUSE (6.3A/250V) VANE MOTOR BUZZER VARISTOR TERMINAL BLOCK<INDOOR/OUTDOOR...
  • Page 13 PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA [LEGEND] SYMBOL NAME SYMBOL NAME SYMBOL NAME INDOOR POWER BOARD LED2 POWER SUPPLY<R.B> WIRELESS REMOTE CONTROLLER BOARD(OPTION) INDOOR CONTROLLER BOARD LED3 TRANSMISSION<INDOOR-OUTDOOR> RECEIVING UNIT FUSE FUSE (6.3A/250V) CAPACITOR<FAN MOTOR> BUZZER LED1 VARISTOR FAN MOTOR LED<RUN INDICATOR >...

  • Page 14: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA 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)

  • Page 15: 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 16: Self-Diagnosis Action Table

    Note: Refer to the manual of outdoor unit for the details of display 10-2. 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 preven- characteristics...
  • Page 17 Abnormal point and detection method Countermeasure Error Code Cause Freezing/overheating protection is (Cooling or drying mode) (Cooling or drying mode) working 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 18 Abnormal point and detection method Countermeasure Error Code Cause Pipe temperature thermistor / 1 Defective thermistor 1–3 Check resistance value of thermistor. Condenser-Evaporator (TH5) characteristics For characteristics, refer to (P1) above. 2 Check contact failure of connector (CN29) 1 The unit is in 3-minute resume protec- 2 Contact failure of connector on the indoor controller board.
  • Page 19 Abnormal point and detection method Countermeasure Error Code Cause ∗ Check LED display on the outdoor control cir- Indoor/outdoor unit communication 1 Contact failure, short circuit or, error (Signal receiving error) cuit board. (Connect A-control service tool, miswiring (converse wiring) of 1 Abnormal if indoor controller board PAC-SK52ST.) indoor/outdoor unit connecting...

  • Page 20: Troubleshooting By Inferior Phenomena

    10-3. 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. 1 Power supply of rated voltage is not supplied to out- 1 Check the voltage of outdoor power is off.
  • Page 21 Note: Refer to the manual of the outdoor unit for the detail of remote controller. Phenomena Cause Countermeasure (1)LED2 on indoor controller board • When LED1 on indoor controller board is lit. 1 Reconfirm the setting of refrigerant 1 Mis-setting of refrigerant address for outdoor unit is off.
  • Page 22 (5) After emergency operation has been deactivated, set the switches etc. to their original positions. (6) Movement of the vanes does not work in emergency operation, therefore you have to slowly set them manually to the appropriate position. 10-5. HOW TO CHECK THE PARTS PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA...
  • Page 23 5.4kΩ -20 -10 10 20 30: (86˚F) 4.3kΩ 50 68 86 104 122 ˚F Temperature 40:(104˚F) 3.0kΩ 10-6.TEST POINT DIAGRAM 10-6-1. Power board PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA CN2S Connect to the indoor controller board (CN2D) Between 1 to 3 12.6-13.7V DC (Pin1 (+))
  • Page 24 10-6-2. Indoor controller board PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA CN2D LED1 LED2 LED3 Connect to the indoor Power supply (I.B) Power supply (R.B) Transmission (Indoor/outdoor) power board (CN2S) (12.5~13.7V DC) CN22 Connect to the terminal...
  • Page 25 Setting by the dip switch and jumper wire Remarks Functions For service board Model 1 2 3 4 5 settings Service board MODELS Capacity PCA-A24GA 1 2 3 4 5 settings PCA-A24GA PCA-A24GA PCA-A30GA 1 2 3 4 5 PCA-A30GA PCA-A30GA PCA-A36GA...

  • Page 26: 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) wThe setting of main/sub unit depends on the refrigerant address.(The setting of dip switch on the outdoor unit) Refrigerant address"00"...
  • Page 27 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 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 running the air-conditioner(1). button (2) for 3 seconds so that [Maintenance mode] appears on the screen (at A ). 2.

  • Page 29: Disassembly Procedure

    DISASSEMBLY PROCEDURE PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 1. Removing the air intake grille Figure 1 (1) Slide the intake grille holding 2 knobs backward to open the intake grille.
  • Page 30 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 3. Removing the fan motor <MF> Photo 2 (1) Remove the intake grille. (2) Disconnect the fan motor connector. Motor Set screws Screws (3) Remove the screw for removing the motor support at both left and right side. (4) Loosen the set screws at the fan motor side of the con- necting joint.
  • Page 31 OPERATING PROCEDURE PHOTOS 6. Removing the vane motor <MV> Photo 4 (1) Remove the air intake grille. (See the figure 1) Relay connector of (2) Remove the left side panel. (See the figure 3) Screw the vane motor (3) Remove the relay connector of vane motor. (4) Remove the electrical box.
  • Page 32 OPERATING PROCEDURE PHOTOS 9. Removing the drain pan Photo 8 (1) Remove the air intake grille. (See the figure 1) (2) Remove the beam. (3) Remove the side panels of right and left. (See the figure 3) (4) Remove the under panel. Remove the screws of the right and left side drain pan.
  • Page 33 OPERATING PROCEDURE PHOTOS 12. Removing the heat exchanger Photo 11 (1) Remove the air intake grille. (See the figure 1) (2) Remove the beam. (3) Remove the side panel (right and left). (See the figure 3) (4) Disconnect the relay connector of the pipe thermistor. (5) Remove the under panel.

  • Page 34: Parts List

    PARTS LIST (non-RoHS compliant) FAN AND FUNCTIONAL PARTS PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA Q'ty/set Wiring Recom- Remarks PCA-A Parts No. Parts Name Specifications Diagram mended 24/30 36/42 (Drawing No.) Symbol Q'ty MOTOR LEG MOTOR LEG PIECE(MOTOR) FAN MOTOR D09C4P70MS FAN MOTOR...
  • Page 35 STRUCTURAL PART PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA 9 10 Part numbers that are circled are not shown in the figure. Q'ty/set Wiring Recom- PCA-A Remarks Parts No. Parts Name Specifications Diagram mended 24/30 36/42 (Drawing No.) Symbol Q'ty LEFT SIDE PANEL...
  • Page 36 ELECTRICAL PARTS PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA TEMP. ON/OFF Q'ty/ set Wiring Recom- PCA-A Remarks Parts No. Parts Name Specifications Diagram mended 24/30 36/42 (Drawing No.) Symbol Q'ty T7W E18 255 4= 440V CAPACITOR T7W E19 255 5= 440V CAPACITOR T7W E56 310...

  • Page 37: Rohs Parts List

    RoHS PARTS LIST FAN AND FUNCTIONAL PARTS PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA Q'ty/set Wiring Recom- Remarks PCA-A Parts Name Specifications Parts No. Diagram mended 24/30 (Drawing No.) 36/42 Q'ty Symbol , GA MOTOR LEG MOTOR LEG PIECE(MOTOR)
  • Page 38 STRUCTURAL PART PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA 9 10 Part numbers that are circled are not shown in the figure. Q'ty/set Wiring Recom- PCA-A Remarks Parts No. Parts Name Specifications 24/30 Diagram mended 36/42 24/30 36/42 (Drawing No.)
  • Page 39 ELECTRICAL PARTS PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA TEMP. ON/OFF Part number that is circled is not shown in the figure. Q'ty/ set Wiring Recom- PCA-A Remarks Parts No. Parts Name Specifications Diagram mended 24/30 36/42 24/30 36/42 (Drawing No.)
  • Page 40 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in Oct. 2007 No.OC368 REVISED EDITION-C PDF 9 Distributed in Jun. 2007 No.OC368 REVISED EDITION-B PDF 9 Distributed in Aug. 2006 No.OC368 REVISED EDITION-A PDF 9 Distributed in Feb.

This manual is also suitable for:

Mr.slim pca-a36gaMr.slim pca-a30gaMr.slim pca-a42ga

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