Service manual

ManualsBrandsMitsubishi ManualsDomestic AppliancesMSC-GA20VB

SPLIT-TYPE, AIR CONDITIONERS

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

CONTENTS

1. TECHNICAL CHANGES ····································3

2. PART NAMES AND FUNCTIONS······················3

3. SPECIFICATION·················································5

4. NOISE CRITERIA CURVES·······························5

5. OUTLINES AND DIMENSIONS ·························6

6. WIRING DIAGRAM ············································7

7. REFRIGERANT SYSTEM DIAGRAM················8

8. SERVICE FUNCTIONS ······································8

9. TROUBLESHOOTING······································11

10. DISASSEMBLY INSTRUCTIONS·····················18

11. PARTS LIST······················································20

12. RoHS PARTS LIST···········································22

13. OPTIONAL PARTS ·························BACK PAGE

MSC-GA20VB -

MSC-GA25VB -

MSC-GA35VB -

SERVICE MANUAL

Wireless type

Models

INDOOR UNIT

NOTE:

This service manual describes technical data of the indoor units.

RoHS compliant products have <G> mark on the spec name plate.

For servicing of RoHS compliant products, refer to the RoHS PARTS LIST (RoHS compliant).

Outdoor unit service manual

MU-GA•VB Series (OB386)

MUH-GA•VB Series (OB387)

MUX-A•VB Series (OB384)

MXZ-A•WV Series (OB319)

No. OB385

REVISED EDITION-B

Revision B:

• Indoor heat exchanger of MSC-GA35VB -

has been changed.

Please void OB385 REVISED EDITION-A.

OB385B.qxp 07.5.21 4:41 PM Page 1

Summary of content (24 pages)

PAGE 1
OB385B.qxp 07.5.21 4:41 PM Page 1 Revision B: SPLIT-TYPE, AIR CONDITIONERS SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS • Indoor heat exchanger of MSC-GA35VB E1 has been changed. Please void OB385 REVISED EDITION-A. INDOOR UNIT No. OB385 SERVICE MANUAL REVISED EDITION-B Wireless type Models MSC-GA20VB MSC-GA25VB MSC-GA35VB - E1 E1 E1 Outdoor unit service manual MU-GA•VB Series (OB386) MUH-GA•VB Series (OB387) MUX-A•VB Series (OB384) MXZ-A•WV Series (OB319) CONTENTS 1.
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OB385B.qxp 07.5.21 4:41 PM Page 2 Revision A: • RoHS PARTS LIST has been added. Revision B: • Indoor heat exchanger of MSC-GA35VB - E1 has been changed.
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OB385B.qxp 07.5.21 4:41 PM 1 Page 3 TECHNICAL CHANGES MSC-A07YV - E1 ➔ MSC-GA20VB - E1 1. Indication of capacity has been changed. (BTU base ➔ kW) 2. P.C. board has been changed. 3. Air cleaning filter has been changed to optional parts. 4. Fan motor has been changed. 5. Fan motor capacitor has been changed. 6. Color of indoor unit has been changed. MSC-A09YV - E1 ➔ MSC-GA25VB - E1 1. Indication of capacity has been changed. (BTU base ➔ kW) 2. P.C. board has been changed. 3.
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OB385B.qxp 07.5.21 4:41 PM Page 4 MSC-GA20VB MSC-GA25VB MSC-GA35VB ACCESSORIES 1 Installation plate 1 2 Installation plate fixing screw 4 o 25 mm 5 3 Remote controller holder 1 4 Fixing screw for 3 3.
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07.5.21 4:41 PM 3 Page 5 SPECIFICATION Indoor model Function Indoor unit power supply Special remarks Fan motor Electrical data Capacity Air flow(High/Med.w/Low w) Power outlet Running current Power input Power factor Fan motor current Model Winding resistance(at 20:) Dimensions WOHOD Weight Air direction Sound level(High/Med.w/Loww ) Fan speed(High/Med.
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OB385B.qxp 07.5.22 7:48 AM MSC-GA35VB Page 6 SPL(dB(A)) FAN SPEED FUNCTION High COOLING 40 HEATING 39 Test conditions. Cooling : DB27: Heating : DB20: LINE WB19: WB -: 90 OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR 80 70 NC-70 60 NC-60 50 NC-50 INDOOR UNIT WALL 40 NC-40 1m 30 NC-30 20 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE 0.8m NC-20 MICROPHONE 10 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz 5 133.5 231.
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Page 7 MSC-GA35VB 161.5 161.5 2.5 41 81.5 326 42 Indoor unit 258 218.5 Installation plate 783 Unit: mm 17.5 07.5.21 4:41 PM 81.5 326 Wall hole [65 Air in 242 5 Installation plate 7 or more 815 278 58 Liquid line [6.35-0.5m Gas line [9.52-0.43m Insulation [37 O.D [21 I.D 90 149 606 { 30 60 19 110 Air out 244 Power supply cord Lead to right 1.0m Lead to left 0.
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OB385B.qxp 7 07.5.21 5:14 PM Page 8 REFRIGERANT SYSTEM DIAGRAM MSC-GA20VB MSC-GA25VB MSC-GA35VB Refrigerant pipe [9.52 (with heat insulator) Indoor heat exchanger Unit:mm Indoor coil thermistor RT12 Flared connection Room temperature thermistor RT11 Flared connection Refrigerant flow in cooling 8 Refrigerant pipe [6.35 (with heat insulator) SERVICE FUNCTIONS MSC-GA20VB MSC-GA25VB MSC-GA35VB 8-1.
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OB385B.qxp 07.5.21 4:41 PM Page 9 Remote controller model : KM04F J1 J2 The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1. After modification, press the RESET button. Table 1 No. 1 unit No. 2 unit No. 3 unit No.
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OB385B.qxp 07.5.21 4:41 PM Page 10 8-4. MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER AND AUTO RESTART FUNCTION 1. MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER SW2-1 sets the AUTO RESTART FUNCTION ON / OFF. The indoor units for MU & MUX type and MUH & MXZ type SW2-2 switches over the MU & MUX type / MUH & MXZ type. are common specifications. Set switch according to the When the units are shipped from the factory, SW2 is as follows. type of outdoor unit.
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OB385B.qxp 07.5.21 4:41 PM 9 Page 11 TROUBLESHOOTING MSC-GA20VB MSC-GA25VB MSC-GA35VB 9-1. Cautions on troubleshooting 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring. 2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller.
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OB385B.qxp 07.5.21 4:41 PM Page 12 9-2. Instruction of troubleshooting MSC-GA20VB MSC-GA25VB MSC-GA35VB Start Indoor unit operates. Outdoor unit doesn't operate normally. Indoor unit operates. Outdoor unit doesn't operate. Outdoor unit operates only in Test Run operation.w2 Outdoor unit doesn't operate even in Test Run operation.w2 Check room temperature thermistor. Refer to 9-6. "Test point diagram and voltage".
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OB385B.qxp 07.5.21 4:41 PM Page 13 9-3. Troubleshooting check table • The following indication does not depend on the shape of lamp. flashing Operation Indicator · Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible abnormalities. · The OPERATION INDICATOR lamp (on the left-hand side) is lighting during normal operation. ❈ Before taking measures, make sure that the symptom reappears, for accurate troubleshooting. Self check table No.
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OB385B.qxp 07.5.21 4:41 PM Page 14 9-4. Trouble criterion of main parts MSC-GA20VB MSC-GA25VB MSC-GA35VB Figure Check method and criterion Part name Room temperature thermistor (RT11) Measure the resistance with a tester.
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OB385B.qxp 07.5.21 4:41 PM Page 15 Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn’t operate with the remote controller. B Check of remote controller and receiver P.C. board wCheck the remote controller is exclusive for this air conditioner. Switch on the remote controller. Is LCD display on the remote controller displayed? No Replace the batteries. (Refer to 9-1-4.) (not clear) Yes Remove batteries, then set them back and press the RESET button.
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OB385B.qxp 07.5.21 4:41 PM Page 16 When OPERATION INDICATOR lamp flashes 0.5-second intervals or 1-time. Outdoor unit does not operate. D How to check mis-wiring and serial signal error w 1 Set the switch(SW2-2) on indoor electronic control P.C. board to MU or MUX type, when the outdoor unit is MU or MUX type. If the setting is MUH or MXZ type, the unit does not work. Start w 2 Short circuit of JPG and JPS on the indoor electronic control P.C.
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07.5.21 4:41 PM Page 17 9-6. Test point diagram and voltage Fuse F11 250V AC 3.15A Power supply input 230V AC } MSC-GA20VB MSC-GA25VB MSC-GA35VB Indoor electronic control P.C. board R132 } Indoor fan motor 230V AC Safety device of fan by horizontal vane CN1R1 Room temperature thermistor RT11 Indoor coil thermistor RT12 Varistor (NR11) J12 12V DC { } + – J33 J33 – + SW2 (Refer to 8-4.) 1sets the Auto restart function ON/OFF. 2switches over MU&MUX type/ MUH & MXZ type.
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OB385B.qxp 10 07.5.21 4:41 PM Page 18 DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. (1) Slide the sleeve and check if there is a locking lever or not.
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OB385B.qxp 07.5.21 4:41 PM Page 19 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box (1) (2) (3) (4) (5) (6) (7) Remove the front panel. (Refer to 1.) Remove the electrical cover. (Refer to 2.) Remove the V.A. clamp. (Refer to 2.) Remove the cord clamp. (Refer to 2.) Remove the terminal block. (Refer to 2.) Remove the screw of earth wire. (Refer to 2.
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OB385B.qxp 07.5.21 4:41 PM 11 Page 20 PARTS LIST (non-RoHS compliant) MSC-GA20VB MSC-GA25VB MSC-GA35VB 11-2. ACCESSORY AND REMOTE CONTROLLER 11-1. INDOOR UNIT STRUCTURAL PARTS 1 (W) 10 9 8 (W) 7 2 Optional parts (See 13. Optional parts.) 3 4 5 (W) These figures show about MSC-GA35VB. 6 (W) 11-1. INDOOR UNIT STRUCTURAL PARTS Symbol No. 1 2 3 4 5 6 7 8 Part No.
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OB385B.qxp 07.5.21 4:41 PM Page 21 PARTS LIST (non-RoHS compliant) MSC-GA20VB MSC-GA25VB MSC-GA35VB 11-4. INDOOR UNIT HEAT EXCHANGER 11-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS 18 17 20 (W) 15 16 14 2 1 3 12 21 13 4 11 22 5 6 7 8 9 10 (W) This figure shows MSC-GA35VB. 11-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Part number that is circled is not shown in the illustration. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Part No.
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OB385B.qxp 07.5.21 4:41 PM 12 Page 22 ROHS PARTS LIST (RoHS compliant) MSC-GA20VB MSC-GA25VB MSC-GA35VB 12-2. ACCESSORY AND REMOTE CONTROLLER 12-1. INDOOR UNIT STRUCTURAL PARTS 1 (W) 10 9 8 (W) 7 2 Optional parts (See 13. Optional parts.) 3 4 5 (W) These figures show about MSC-GA35VB. 6 (W) No. 1 2 3 4 5 6 7 8 RoHS 12-1. INDOOR UNIT STRUCTURAL PARTS G G G G G G G G G G G Symbol Part No.
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07.5.21 4:55 PM Page 23 ROHS PARTS LIST (RoHS compliant) MSC-GA20VB MSC-GA25VB MSC-GA35VB 12-4. INDOOR UNIT HEAT EXCHANGER 12-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS 18 17 20 (W) 15 16 14 2 1 3 12 21 13 4 11 22 5 6 7 8 9 10 (W) This figure shows MSC-GA35VB. 12-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS Part number that is circled is not shown in the illustration. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 RoHS OB385B.
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OB385B.qxp 13 07.5.21 4:41 PM Page 24 OPTIONAL PARTS AIR CLEANING FILTER ● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity. ● Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible. ● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. ● DO NOT reuse AIR CLEANING FILTER even if it is washed.