Service manual

ManualsBrandsMitsubishi ManualsDomestic AppliancesMCF-A12

SERVICE MANUAL

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 ············································6

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

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

9. TROUBLESHOOTING······································10

10. DISASSEMBLY INSTRUCTIONS·····················15

11. PARTS LIST······················································17

12. OPTIONAL PARTS···········································19

Wireless type

Models

MCF-A12WV -

(WH)

MCF-A18WV -

(WH)

MCF-A24WV -

(WH)

No. OB338

REVISED EDITION-A

(When installed on the ceiling)

(When installed on the floor)

FLOOR AND CEILING TYPE AIR CONDITIONERS

Indication of

model name

MCF-A12WV -

MCF-A18WV -

MCF-A24WV -

NOTE:

• This service manual describes technical data of indoor units

• As for outdoor units MUCF-A18WV - and MUCF-A24WV - , refer to the service manual OB339.

• As for outdoor unit MU-A12YV - , refer to the service manual OB330 REVISED EDITION-A.

E1E1

Revision A:

● Power input of SPECIFICATION has modified.

● Model name of remote controller has been

corrected.

Please void OB338.

OB338A--1.qxp 04.4.5 11:56 AM Page 1

Summary of content (20 pages)

PAGE 1
OB338A--1.qxp 04.4.5 11:56 AM Page 1 Revision A: FLOOR AND CEILING TYPE AIR CONDITIONERS ● Power input of SPECIFICATION has modified. ● Model name of remote controller has been corrected. Please void OB338. No. OB338 REVISED EDITION-A SERVICE MANUAL Wireless type Models MCF-A12WV MCF-A18WV MCF-A24WV - E1 (WH) E1 (WH) E1 (WH) (When installed on the floor) CONTENTS Indication of model name MCF-A12WV MCF-A18WV MCF-A24WV - (When installed on the ceiling) E1 E1 E1 1.
PAGE 2
OB338A--1.qxp 04.4.5 11:56 AM Page 2 Revision A: •Power input of SPECIFICATION has modified. •Model name of remote controller has been corrected. SPECIFICATION, SERVICE FUNCTION and PARTS LIST have modified. 1 TECHNICAL CHANGES MCF-13NV - E4 ➔ MCF-A12WV - E1 MCF-18NV - E3 ➔ MCF-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.
PAGE 3
OB338A--1.qxp 04.4.5 11:56 AM MCF-A12WV - E1 Page 3 MCF-A18WV - MCF-A24WV - 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 FAN SPEED CONTROL button TOO COOL FAN STOP VANE START OFF-TIMER button I FEEL COOL FAN ON-TIMER button DRY MODE HR. ECONO COOL MIN.
PAGE 4
OB338A--1.qxp 3 04.4.5 11:56 AM Page 4 SPECIFICATION Indoor model Function 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(at 20:) Dimensions WOHOD Weight Air direction Sound level (High/Med.W/LowW) Fan speed (High/Med.
PAGE 5
OB338A--1.qxp 04.4.5 11:56 AM 4 Page 5 NOISE CRITERIA CURVES NOISE CRITERIA CURVES MCF-A12WV - E1 MCF-A18WV - FAN SPEED SPL(dB(A)) High 44 FAN SPEED SPL(dB(A)) LINE High OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.
PAGE 6
OB338A--1.qxp 04.4.5 11:56 AM 5 Page 6 OUTLINES AND DIMENSIONS MCF-A24WV - Unit: mm E1 114 MCF-A12WV - E1 MCF-A18WV - E1 INDOOR UNIT (When installed on the floor) 80.8 500mm or more 906 16 112.8 650 616.5 500mm or more 93 77 500 mm (When installed on the ceiling) or m 143 500mm or more 113 42.5 1000mm or more 170 ore 180 1100 58 19 Gas line [12.7 (MCF-A12/A18WV) [15.88 (MCF-A24WV) 162 Liquid line [6.
PAGE 7
OB338A--1.qxp 04.4.5 11:56 AM 7 Page 7 REFRIGERANT SYSTEM DIAGRAM MCF-A12WV - MCF-A18WV - E1 INDOOR UNIT INDOOR UNIT Refrigerant pipe [12.7 (with heat insulator) Indoor heat Distributor exchanger Unit : mm E1 Refrigerant pipe [12.7 (with heat insulator) 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.
PAGE 8
OB338A--1.qxp 8 04.4.5 11:56 AM Page 8 SERVICE FUNCTIONS MCF-A12WV - E1 MCF-A18WV - E1 MCF-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 14.) 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.
PAGE 9
OB338A--1.qxp 04.4.5 11:56 AM Page 9 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.
PAGE 10
OB338A--1.qxp 9 04.4.5 11:56 AM Page 10 TROUBLESHOOTING MCF-A12WV - E1 MCF-A18WV - E1 MCF-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 servicing.
PAGE 11
OB338A--1.qxp 04.4.5 11:56 AM Page 11 9-2. Instruction of troubleshooting Start Indoor unit operates. Outdoor unit doesn't operate. Outdoor unit operates in only Test Run operation. Outdoor unit doesn't operate even in Test Run operation. Check room temperature thermistor. Refer to "Test point diagram and voltage" on page 14. Check of wiring diagram of outdoor unit.
PAGE 12
OB338A--1.qxp 04.4.5 11:56 AM Page 12 2. Trouble criterion of main parts MCF-A12WV - E1 MCF-A18WV - E1 Indoor coil thermistor (RT12) Figure Check method and criterion Part name Room temperature thermistor (RT11) MCF-A24WV - E1 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.
PAGE 13
OB338A--1.qxp 04.4.5 11:56 AM Page 13 Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote controller. B Check of remote controller and receiver P.C. board w Check if the remote controller is exclusive for this air conditioner. Switch on the remote controller No Is LCD display on remote controller visible? Replace the batteries.(Refer to page 10.) (not clear) Yes Remove batteries and then set them back and press the RESET button.
PAGE 14
OB338A--1.qxp 04.4.5 11:56 AM Page 14 TEST POINT DIAGRAM AND VOLTAGE MCF-A12WV - E1 MCF-A18WV - E1 MCF-A24WV - E1 Indoor electronic control P.C. board Fan motor power supply 230V AC 5 4 3 2 1 Fuse (F11) 250V AC 3.15A Varistor (NR11) Power supply input 230V AC + – – + } 5V DC } 12V DC Release of “AUTO RESTART FUNCTION” Solder jumper wire to the JR07. (Refer to page 9.) Room temperature thermistor (RT11) Time short point JPG and JPS (Refer to page 8.
PAGE 15
OB338A--1.qxp 04.4.5 11:56 AM 10 Page 15 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.
PAGE 16
OB338A--1.qxp 04.4.5 11:56 AM Page 16 PHOTOS OPERATING PROCEDURE 3. Removing the indoor heat exchanger. (1) Remove the grille. (Refer to 1(1) (2).) (2) Remove the screws on both side and in front of the front panel. (Photo 5) (3) Remove the screws of the nozzle assembly. (Photo 6) (4) Remove the electronic box. (Refer to 1.) (5) Remove the indoor fan motor. (Refer to 2.) (6) Remove the screws of the motor support . (7) Remove the fan casing.
PAGE 17
OB338A--1.qxp 04.4.5 11:56 AM 11 Page 17 PARTS LIST MCF-A12WV MCF-A18WV MCF-A24WV - E1 E1 E1 (WH) (WH) (WH) 11-1. INDOOR UNIT STRUCTURAL PARTS 15 14 13 1 12 11 2 10 3 9 4 8 5 7 6 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.
PAGE 18
OB338A--1.qxp 04.4.5 11:56 AM MCF-A12WV MCF-A18WV MCF-A24WV - E1 E1 E1 Page 18 (WH) (WH) (WH) 11-3. ACCESSORY AND REMOTE CONTROLLER 11-2. INDOOR UNIT ELECTRICAL PARTS 9 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.
PAGE 19
OB338A--1.qxp 04.4.5 11:56 AM 12 Page 19 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.
PAGE 20
OB338A--1.qxp 04.4.5 11:56 AM Page 20 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Apr. 2004. No.OB338 REVISED EDITION-A 6 Distributed in Mar. 2004. No.OB338 6 Made in Japan New publication, effective Apr. 2004 Specifications subject to change without notice.