Table of Contents
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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
PCA-A30GA
PCA-A30GA
PCA-A36GA
PCA-A36GA
PCA-A42GA
PCA-A42GA
Model name
indication
ON/OFF
Revision:
• WIRING DIAGRAM has been
• Some descriptions have been
1
• Please void OC368
NOTE:
1
• This manual describes only
• RoHS compliant products have
1
• For servicing RoHS compli-
1
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 ··················13
10. TROUBLESHOOTING ···································14
11. DISASSEMBLY PROCEDURE·······················26
12. PARTS LIST ···················································31
13. RoHS PARTS LIST ········································34
3 3 2 2 3
June 2007
No. OC368
REVISED EDITION-B
changed in REVISED EDI-
TION-B.
modified.
REVISED
EDITION-A
.
service data of the indoor
units.
<G> mark on the spec name
plate.
ant products, refer to the RoHS
PARTS LIST.
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric PCA-A24GA
Summary of Contents for Mitsubishi Electric PCA-A24GA
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Page 1: Table Of Contents
No. OC368 REVISED EDITION-B SERVICE MANUAL Revision: Indoor unit • WIRING DIAGRAM has been [Model names] [Service Ref.] changed in REVISED EDI- TION-B. PCA-A24GA • Some descriptions have been PCA-A24GA modified. PCA-A24GA REVISED • Please void OC368 PCA-A30GA EDITION-A 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 has been changed. 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 PUY-A12/18/24/30/36/42NHA 2-2. TECHNICAL DATA BOOK 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.
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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.
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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 Service Ref. Power supply(phase, cycle, voltage) Single phase, 60Hz, 208/230V Max. Fuse Size Min.Circuit Ampacity Munsell 0.70Y 8.59/0.97 External finish Plate fin coil Heat exchanger Sirocco fan (direct) o 3 Fan(drive) o No. Fan motor output 0.070 Fan motor 0.53... -
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 NOTCH SPL(dB) LINE NOTCH SPL(dB) LINE High High PCA-A42GA PCA-A30GA Medium1 Medium1 PCA-A36GA PCA-A24GA Medium2... -
Page 10: Outlines And Dimensions
OUTLINES AND DIMENSIONS PCA-A24GA PCA-A24GA Unit : inch(mm) PCA-A30GA PCA-A30GA NOTES: Use M10 or W3/8 screw for anchor bolt. MODEL 24/30 5 Liquid pipe 3/8F 5-1/2(140) 2-3/4(70) 4 Gas pipe 5/8F 48-13/16(1240) (Suspension bolt pitch) 3-7/16(87) 50-13/16(1290) 5/8(16) 7-3/16(182) liquid... - Page 11 PCA-A36GA PCA-A36GA Unit : inch(mm) 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 3/8F 4 Gas pipe 5/8F 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) 7-13/16(198) 51-9/16(1310) 9-5/8(245)
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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: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM 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) Pipe temperature thermistor/liquid Room temperature... -
Page 14: 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 inferior phenomenon reoccurrence at field are summarized in the table below. Check the contents below before investigating details. -
Page 15: 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 16 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 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 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 18 Abnormal point and detection method Countermeasure Error Code Cause Indoor/outdoor unit communication 1 Contact failure, short circuit or, Check LED display on the outdoor control cir- 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...
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Page 19: 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 20 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 21 10-4. WHEN WIRED REMOTE CONTROLLER OR INDOOR UNIT MICROCOMPUTER TROUBLES 1. If there is not any other problem when trouble occurs, emergency operation starts as the indoor controller board switch (SWE) is set to ON. During the emergency operation the indoor unit operates with Indoor fan at high speed. 2.
- Page 22 10-5. HOW TO CHECK THE PARTS PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA Parts name Check points Room temperature Disconnect the connector then measure the resistance using a tester. thermistor (TH1) (At the ambient temperature 10:(50˚F)~30:(86˚F)) Pipe temperature thermistor...
- Page 23 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 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 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) CN3C Transmission (Indoor/outdoor) CN22 (0~24V DC) Connect to the terminal...
- Page 25 Functions For service board Model 1 2 3 4 5 settings Service board MODELS Capacity 1 2 3 4 5 PCA-A24GA settings PCA-A24GA 1 2 3 4 5 PCA-A30GA PCA-A30GA 1 2 3 4 5 PCA-A36GA PCA-A36GA 1 2 3 4 5...
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Page 26: Disassembly Procedure
DISASSEMBLY PROCEDURE 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. (2) When the intake grille left open, push the stoppers on the rear 2 hinges to pull out the intake grille. - Page 27 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 28 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 29 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 30 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.
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Page 31: 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 32 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 33 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...
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Page 34: Rohs Parts List
RoHS PARTS LIST FAN AND FUNCTIONAL PARTS 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 36/42 (Drawing No.) Symbol Q'ty MOTOR LEG MOTOR LEG PIECE(MOTOR) T7W 40J 762 FAN MOTOR D09C4P70MS... - 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 REMOTE CONTROLLER PAR-21MAA HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in Jun. 2007 No.OC368 REVISED EDITION-B PDF 9 Distributed in Aug. 2006 No.OC368 REVISED EDITION-A PDF 9 New publication, effective Jun. 2007 Specifications subject to change without notice.