Service manual

ManualsBrandsMitsubishi ManualsAir ConditionerMCFH-A18WV

SERVICE MANUAL

Wireless type

Models

MCFH-A12WV-

(WH)

MCFH-A18WV-

(WH)

MCFH-A24WV-

(WH)

No. OB336

(When installed on the ceiling)

(When installed on the floor)

FLOOR AND CEILING TYPE AIR CONDITIONERS

NOTE:

• This manual describes technical data of indoor units

• As for outdoor units MUCFH-A18/A24WV- , refer to the service manual OB337.

• As for outdoor unit MUH-A12YV- , refer to the service manual OB331.

• As for outdoor units MXZ-A18/A26/A32WV- , refer to the service manual OB319.

CONTENTS

1. TECHNICAL CHANGES ····································2

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

3. SPECIFICATION·················································4

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

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

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

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

8. SERVICE FUNCTIONS ······································9

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

10. DISASSEMBLY INSTRUCTIONS·····················19

11. PARTS LIST······················································21

12. OPTIONAL PARTS···········································23

Indication of

model name

MCFH-A12WV-

MCFH-A18WV-

MCFH-A24WV-

OB336--1.qxp 04.1.6 11:12 AM Page 1

Summary of content (24 pages)

PAGE 1
OB336--1.qxp 04.1.6 11:12 AM Page 1 FLOOR AND CEILING TYPE AIR CONDITIONERS No. OB336 SERVICE MANUAL Wireless type Models MCFH-A12WVMCFH-A18WVMCFH-A24WV- E1 (WH) E1 (WH) E1 (WH) CONTENTS (When installed on the floor) Indication of model name MCFH-A12WVMCFH-A18WVMCFH-A24WV- (When installed on the ceiling) E1 E1 E1 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················2 3. SPECIFICATION·················································4 4.
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OB336--1.qxp 1 04.1.6 11:13 AM Page 2 TECHNICAL CHANGES MCFH-13NV- E4 ➔ MCFH-A12WV- E1 MCFH-18NV- E3 ➔ MCFH-A18WV- E1 1. Rated voltage has changed. (220-240V ➔ 230V) 2. Indoor electronic control P.C. board has changed. 3. Horizontal vane has changed. 4. Terminal block has changed. 5. Indoor heat exchanger has changed. 6. Remote controller has changed. Econo cool operation has been added. 7. Indoor fan motor has changed. (RB4V25-AB ➔ RB4V25-AC) 1. Rated voltage has changed. (220-240V ➔ 230V) 2.
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OB336--1.qxp 04.1.6 11:13 AM MCFH-A12WV MCFH-A18WV MCFH-A24WV - Page 3 E1 E1 E1 REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE /STOP (ON /OFF)button PM AM TOO ON/OFF WARM TOO COOL TEMPERATURE buttons Open the front lid. Indication of remote controller model is on back. CLOCK PM AM TOO ON/OFF WARM VANE CONTROL button TOO COOL FAN STOP VANE START I FEEL COOL HEAT DRY MODE HR. ECONO COOL MIN.
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OB336--1.qxp 3 04.1.6 11:13 AM Page 4 SPECIFICATION MCFH-A12WV- Indoor model Function Cooling Power supply Special remarks Fan motor Electrical data Capacity Air flow(High/Med.W/LowW) Power outlet Running current Power input Auxiliary heater Power factor Fan motor current Model Winding resistance(at20:) Dimensions WOHOD Weight Air direction Sound level(High/Med.W/LowW) Fan speed(High/Med.
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04.1.6 11:13 AM 4 Page 5 NOISE CRITERIA CURVES MCFH-A12WV - MCFH-A18WV - E1 SPEED SPL(dB(A)) High 46 Test conditions, Cooling : DB 27: WB 19:\ Heating : DB 20: WB 15: OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.
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OB336--1.qxp 04.1.6 11:13 AM 5 Page 6 OUTLINES AND DIMENSIONS E1 Unit: mm E1 E1 114 MCFH-A12WV MCFH-A18WV MCFH-A24WV INDOOR UNIT 80.8 906 16 112.8 (When installed on the floor) 93 77 m o (When installed on the ceiling) rm 113 180 1100 58 19 Liquid line 6.35 162 50cm or more 42.5 100cm or more 170 ore Wireless remote controller 6 143 50c 616.5 50cm or more 650 50cm or more Gas line 12.7 (MCFH-A12/A18WV) 15.
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04.1.6 11:13 AM 6 Page 7 WIRING DIAGRAM MCFH-A12WV MCFH-A18WV MCFH-A24WV - MODELS WIRING DIAGRAM E1 E1 E1 INDOOR UNIT TB1 PE POWER SUPPLY ~/N 230V 50Hz GRN/YLW N BLU L N TB2 CN 112 TRANS LDCOM LDC11 C11 LDC12 LDFH X144 LDFM SR143 LDFL SR142 LDFVL SR141 BLU F11 CN CN 101 113 3 CN 151 4 5 REMOTE CONTROLLER NAME DISP/ RECEIVER P.C.BOARD ELECTRONIC CONTROL P.C BOARD WHT ORN RED BLK YLW BLU BRN NAME VANE MOTOR FUSE (3.
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OB336--1.qxp 7 04.1.6 11:13 AM Page 8 REFRIGERANT SYSTEM DIAGRAM Unit : mm MCFH-A12WV- MCFH-A18WV- E1 E1 INDOOR UNIT INDOOR UNIT Refrigerant pipe [12.7 (with heat insulator) Indoor heat Distributor exchanger Indoor heat Distributor exchanger Flared connection Indoor coil thermistor RT12 Flared connection Indoor coil thermistor RT12 Room temperature thermistor RT11 Room temperature thermistor RT11 Flared connection Refrigerant pipe [6.
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OB336--1.qxp 04.1.6 11:13 AM 8 Page 9 SERVICE FUNCTIONS MCFH-A12WV - E1 MCFH-A18WV - E1 MCFH-A24WV - E1 8-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. The time will be shortened as follows. (Refer to page 18.) 3-minutes time delay : 3-minutes → 3-seconds Set time : 1 minute ➔ 1-second Set time : 3 minute ➔ 3-second (It takes 3 minutes for the compressor to start operation.
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OB336--1.qxp 04.1.6 11:13 AM Page 10 8-3. AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are memorized by the indoor electronic control P.C. board. The “AUTO RESTART FUNCTION” sets to work the moment power has restored after power failure.Then, the unit will restart automatically. However if the unit is operated in “I FEEL CONTROL” mode before power failure, the operation is not memorized.
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OB336--1.qxp 04.1.6 11:13 AM 9 Page 11 TROUBLESHOOTING MCFH-A12WV - E1 MCFH-A18WV - E1 MCFH-A24WV - E1 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 the following during service.
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OB336--1.qxp 04.1.6 11:13 AM Page 12 9-2. Instruction of troubleshooting Start Indoor unit operates. Outdoor unit doesn't operate. Outdoor unit operates in only Test Run operation. Check room temperature thermistor. Refer to "Test point diagram and voltage" on page 18. Flash on and off at 0.5second interval Cause: Indoor/ Outdoor unit • Mis-wiring or trouble of serial signal Refer to E "How to check miswiring and serial signal error (When outdoor unit doesn't work)" on page 17.
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OB336--1.qxp 04.1.6 11:13 AM Page 13 1. Troubleshooting check table OPERATION INDICATOR lamp Before taking measures, make sure that the symptom reappears, for accurate troubleshooting. Self check table NO. Abnormal point 1 Mis-wiring or Serial signal Indication 0.5-second ON 2 Room temperature thermistor Check point Outdoor unit does not run. ● Check wiring (visual check and conductivity check). When serial signal stops for 4 ● Check indoor electronic control to 5 seconds. P.C.board.
PAGE 14
OB336--1.qxp 04.1.6 11:13 AM Page 14 2. Trouble criterion of main parts MCFH-A12WV - E1 MCFH-A18WV - Indoor coil thermistor (RT12) MCFH-A24WV - E1 Check method and criterion Part name Room temperature thermistor (RT11) E1 Figure Measure the resistance with a tester. (Part temperature 10°C ~ 30°C) Normal Abnormal 8kΩ ~ 20kΩ Open or short-circuit Measure the resistance between the terminals with a tester.
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OB336--1.qxp 04.1.6 11:13 AM Page 15 Indoor fan does not operate. A Check of indoor fan motor No Turn OFF power supply. Check connector (Fan motor) visually. Yes No Is soldered point of the connector correctly soldered? Are lead wires connected? Yes Reconnect the lead wires. Resolder it. Disconnect lead wires from connector (Indoor fan motor). Measure resistance between lead wires No.1 and No.4 and then No.3 and No.4 of the indoor fan motor.
PAGE 16
OB336--1.qxp 04.1.6 11:13 AM Page 16 The unit does not operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch. C Check of indoor electronic control P.C. board Replace the fuse. Yes No Is fuse(F11)blown? Check both “parts side”and “pattern side” of indoor electronic control P.C. board visually. Be sure to check both fuse and varistor in any case. Is varistor(NR11)burnt? Trouble of the indoor electronic control P.C. board.
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OB336--1.qxp 04.1.6 11:13 AM Page 17 When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit does not operate. E How to check mis-wiring and serial signal error (when outdoor unit does not work) w 1 Short circuit of JPG and JPS on the electronic control P.C. board enables self-check to be displayed in 3 seconds. Start Yes Repair wiring. Is there mis-wiring, poor contact, or wire disconnection? No 1.
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OB336--1.qxp 04.1.6 11:13 AM Page 18 TEST POINT DIAGRAM AND VOLTAGE MCFH-A12WV - E1 MCFH-A18WV - E1 MCFH-A24WV - E1 Indoor electronic control P.C. board Fan motor power supply 230V AC 7 5 6 4 3 2 1 8 Fuse (F11) 250V AC 3.15A Varistor (NR11) Power supply input 230V AC R132 about 20V DC (Refer to page 17.) + – – + } 5V DC } 12V DC Solder jumper wire to the JR07 on the indoor electronic control P.C. board. (Refer to page 10.
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OB336--1.qxp 04.1.6 11:13 AM 10 Page 19 DISASSEMBLY INSTRUCTIONS <"Terminal with lock mechanism" Detaching points> In case of terminal with lock mechanism, detach the terminal as shown below. There are two types ( Refer to (1) and (2)) of the terminal with lock mechanism. The terminal with no lock mechanism can be removed by pulling it out. Check the shape of the terminal and work. Slide the sleeve and check if there is a locking lever or not. Sleeve Locking lever 1Slide the sleeve.
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OB336--1.qxp 04.1.6 11:13 AM Page 20 OPERATING PROCEDURE PHOTOS Photo 4 2. Removing the indoor fan motor (1) (2) (3) (4) (5) Remove the grille. (Refer to 1(1) (2).) Remove the fan casing.(upper) Disconnect the connector of the indoor fan motor. Disconnect the ground wire of the fan motor. Remove the screws of the motor band and remove the catch. (6) Take out the sirocco fan and the indoor fan motor. Motor band Fan casing (upper) Indoor fan motor Screws 3. Removing the indoor heat exchanger.
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OB336--1.qxp 04.1.6 11:14 AM 11 Page 21 PARTS LIST MCFH-A12WV - E1 (WH) MCFH-A18WV - E1 (WH) MCFH-A24WV - E1 (WH) 11-1. INDOOR UNIT STRUCTURAL PARTS 15 14 13 1 12 11 2 10 3 9 4 8 5 6 7 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 Part No.
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OB336--1.qxp 04.1.6 11:14 AM Page 22 MCFH-A12WV - E1 (WH) MCFH-A18WV - E1 (WH) MCFH-A24WV - E1 (WH) 11-2. INDOOR UNIT ELECTRICAL PARTS 9 11-3. ACCESSORY AND REMOTE CONTROLLER 8 7 6 5 4 12 13 1 2 3 2 1 11-2. INDOOR UNIT ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. No. 1 2 3 4 5 6 7 8 9 10 11 Part No.
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OB336--1.qxp 04.1.6 11:14 AM 12 Page 23 OPTIONAL PARTS 12-1. AIR CLEANING FILTER ● If the air cleaning filter is clogged, it may lower the unit’s capacity or cause condensation at the air outlet . ● The air cleaning filter is disposable . The standard usable term is about 4 months . However , if the color of the filter turns to dark brown , replace soon . Remove the air filter and the air cleaning filter together. Separate the air cleaning filter (white bellows type) from the air filter. Part No.
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OB336--1.qxp 04.1.6 11:14 AM Page 24 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jan. 2004. No.OB336 6 Made in Japan New publication, effective Jan. 2004 Specifications subject to change without notice.