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SERVICE MANUAL

Wireless type
Models

MCFZ-A12WV -

(WH)

MCFZ-A18WV -

(WH)

MCFZ-A24WV -

(WH)

(When installed on the ceiling)

(When installed on the floor)

FLOOR AND CEILING TYPE AIR CONDITIONERS

CONTENTS

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

2. SPECIFICATION·················································4

3. NOISE CRITERIA CURVES ·······························5

4. OUTLINES AND DIMENSIONS ·························6

5. WIRING DIAGRAM ············································6

6. REFRIGERANT SYSTEM DIAGRAM ················8

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

8. TROUBLESHOOTING······································10

9. DISASSEMBLY INSTRUCTIONS ····················19

10. PARTS LIST······················································21

11. OPTIONAL PARTS ···········································23

Indication of
model name
MCFZ-A12WV -
MCFZ-A18WV -
MCFZ-A24WV -

NOTE:

• This service manual describes technical data of indoor units.
• As for outdoor units MUZ-A12YV -

and MUZ-A12YVH -

refer to the service manual OB328 REVISED EDITION-A.

• As for outdoor units MUZ-A18YV -

and MUZ-A24YV -

refer to the service manual OB346 REVISED EDITION-A.

Revision A:

●

MCFZ-A18WV-

and MCFZ-A24WV-

have been added.

Please void OB344.

No. OB344

REVISED EDITION-A

OB344A--1.qxp 04.6.14 1:04 PM Page 1

Содержание MCFZ-A12WV

Страница 1: ...RVICE FUNCTIONS 8 8 TROUBLESHOOTING 10 9 DISASSEMBLY INSTRUCTIONS 19 10 PARTS LIST 21 11 OPTIONAL PARTS 23 Indication of model name MCFZ A12WV MCFZ A18WV MCFZ A24WV E1 E1 E1 NOTE This service manual describes technical data of indoor units As for outdoor units MUZ A12YV and MUZ A12YVH refer to the service manual OB328 REVISED EDITION A As for outdoor units MUZ A18YV and MUZ A24YV refer to the serv...

Страница 2: ...e controller Remote controller holder Fixing screw for 3 5 o 16mm Black Battery AAA for remote controller Drain hose Drain pipe cover Knockout cover Screw for 4 o 10mm 2 2 1 1 2 2 1 1 1 2 Q ty Remote controller ON OFF FAN TOO WARM TOO COOL VANE MODE ECONO COOL STOP START HR MIN AMPM CLOCK C AM RESET CLOCK I FEEL COOL DRY AUTO HEAT ON OFF TOO COOL PM AM TOO WARM Open the front lid Signal transmitti...

Страница 3: ...OOL PM AM TOO WARM Open the front lid Signal transmitting section Operation display section OPERATE STOP ON OFF button TEMPERATURE buttons OPERATION SELECT button FAN SPEED CONTROL button OFF TIMER button ON TIMER button RESET button ECONO COOL button VANE CONTROL button CLOCK SET button HR button MIN button TIME SET button Indication of remote controller model is on back ...

Страница 4: ...0 25 5 48 45W 42W 1 320 1 190 1 060 3 10 10 KG04C MCFZ A12WV E1 Single phase 230V 50Hz 780 636W 492W 10 0 30 66 96 0 30 RB4V25 AC WHT BLK 182 2 BLK YLW 68 9 YLW BLU 47 5 BLU BRN 31 5 BRN RED 22 9 1 100 O 650 O 180 25 5 46 41W 35W 1 240 1 060W 845W 3 10 10 KG04B NOTE Test conditions are based on ISO 5151 Cooling Indoor Dry bulb temperature 27 C Wet bulb temperature 19 C Outdoor Dry bulb temperature...

Страница 5: ...50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz Test conditions Cooling Dry bulb temperature 27 Wet bulb temperature 19 Heating Dry bulb temperature 20 Wet bulb temperature 15 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE High SPEED 48 SPL dB A LINE 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 ...

Страница 6: ...N CN F11 NR11 C11 2 1 3 2 7 8 LDFH LDFL LDFM LDC12 LDC11 LDCOM BLK BLU YLW 6 5 4 ORN RED WHT 2 3 1 GRN YLW BLK MF BLU BRN YLW ORN RED WHT 2 112 CN 2 RT12 BLU GRN YLW BRN SR141 LDFVL GRN YLW BLU WHT RED 230V TB2 PE TB1 CIRCUIT BREAKER N L N 230V 50Hz POWER SUPPLY 52C 3 4 MODEL WIRING DIAGRAM MCFZ A12WV E1 SYMBOL SR141 SR143 TB1 TB2 X144 52C SYMBOL MV NR11 RT11 RT12 NAME NAME NAME INDOOR FAN CAPACIT...

Страница 7: ...N 230V BRN SR141 LDFVL TB2 PE CIRCUIT BREAKER HIC1 F11 NR11 MODELS WIRING DIAGRAM SYMBOL SR141 SR143 TB1 TB2 X144 SYMBOL MV NR11 RT11 RT12 NAME NAME NAME INDOOR FAN CAPACITOR FUSE 3 15A DC DC CONVERTER INDOOR FAN MOTOR INNER FUSE VANE MOTOR VARISTOR ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR SOLID STATE RELAY TERMINAL BLOCK RELAY 1 About the outdoor side electric wiring refer to the outdoo...

Страница 8: ...int as shown below 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 MCFZ A12WV MCFZ A18WV MCFZ A24WV E1 E1 E1 Remote controller model KG04B MCFZ A12WV KG04C MCFZ A18 A24WV NOTE For remodelling take out the batteries and press the OPERATE STOP ON OFF button twice or 3 times at first After fini...

Страница 9: ...3 minutes for the compressor to start running NOTE The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller If main power is turned OFF or a power failure occurs while AUTO START STOP timer is active the timer setting is cancelled If the unit has been off with the remote controller before power failure the auto restart function ...

Страница 10: ...mality indication is flashing on and off before starting service work 2 If the electronic control P C board is supposed to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 3 When troubleshooting refer to the flow chart and the check table on page 11 and 12 4 How to replace batteries Weak batteries may cause the remote controller malfunc...

Страница 11: ...ture indoor coil thermistor Check room temperature thermistor and indoor coil thermistor Refer to Test point diagram and voltage on page 17 or 18 4 time flash Cause Indoor unit Trouble of indoor unit control system Replace the indoor electronic control P C board Refer to D How to check mis wiring and serial signal error When outdoor unit doesn t work on page 15 or 16 Unit doesn t operate normal op...

Страница 12: ...w to check mis wiring and serial signal error on page 15 or 16 6 Abnormal point Outdoor unit does not operate Room tempera ture thermistor 2 time flash 2 5 second OFF Detect Indoor coil room temperature thermistor short or open circuit every 8 seconds during operation Refer to the characteristics of indoor coil thermistor and room temperature thermistor on page 17 or 18 4 time flash 2 5 second OFF...

Страница 13: ... the resistance between the terminals with a tester Part temperature 10 C 30 C Room temperature thermistor RT11 Part name Indoor coil thermistor RT12 Indoor fan motor MF INNER FUSE 145 i 2 CUT OFF Check method and criterion Measure the resistance with a tester Part temperature 10 C 30 C Figure Normal 8kΩ 20kΩ Abnormal Open or short circuit Vane motor MV Measure the resistance between the terminals...

Страница 14: ... start type within the range of 1m Is the voltage approx 4V DC Replace the indoor electronic control P C board Replace the receiver P C board Replace the remote controller Reinstall the unit away from lights Attach a filter on receiving section of the indoor unit Is LCD display on remote controller visible Remove the batteries then set them back and press the RESET button Refer to 10 Check if the ...

Страница 15: ...nnecting wire Turn ON the power supply Indoor unit Press the EMERGENCY OPERATION switch Is there amplitude of 5 to 10V DC between outdoor terminal block N and 3 after 3 minutes for confirmation of serial signal 1 Turn OFF the power supply 2 Disconnect the connector CN61 between the compressor and the power transistor module 3 Turn ON the power supply 4 Press the EMERGENCY OPERATION switch No Yes N...

Страница 16: ... Procedure of release of failure mode 1 Press the EMERGENCY OPERATION switch 2 Turn OFF the power supply Indoor outdoor unit 3 Press the RESET button on the remote controller Start No Turn ON the power supply Indoor outdoor unit Press once EMERGENCY OPERATION switch Is there any mis wiring poor contact or wire disconnection w2 Make them sure Yes After 3 minutes mis wiring is indicated 0 5 second O...

Страница 17: ...OLTAGE MCFZ A12WV E1 Indoor electronic control P C board Fan motor power supply 230V AC 7 6 5 4 3 2 1 Med High Fuse F11 250V AC 3 15A Power supply input 230V AC 12V DC 5V DC Time short point JPG and JPS Refer to page 8 Indoor coil thermistor RT12 Room temperature thermistor RT11 Very Low Low Release of Auto restart function Solder jumper wire to the JR07 Refer to page 9 Room temperature thermistor...

Страница 18: ...MCFZ A18WV MCFZ A24WV E1 E1 Indoor electronic control P C board Fan motor power supply 230V AC 7 6 5 4 3 2 1 Med High Fuse F11 250V AC 3 15A Power supply input 230V AC 12V DC 5V DC Time short point JPG and JPS Refer to page 8 Indoor coil thermistor RT12 Room temperature thermistor RT11 Very Low Low Release of Auto restart function Solder jumper wire to the JR07 Refer to page 9 Room temperature the...

Страница 19: ... box Terminal block MCFZ A12WV MCFZ A18WV MCFZ A24WV INDOOR UNIT E1 E1 E1 Electronic control P C board Slide the sleeve and check if there is a locking lever or not 1Slide the sleeve 2Pull the terminal while pushing the locking lever 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 ...

Страница 20: ...he drain pan and remove the screws Photo 7 9 Remove the screws under the drain pan Photo 8 10 Remove the drain pan 11 Remove the indoor heat exchanger Photo 5 Photo 6 Photo 7 Photo 8 Screws Insulation and screws Screws Screws 2 Removing the indoor fan motor 1 Remove the grille Refer to 1 1 2 2 Remove the fan casing upper 3 Disconnect the connector of the indoor fan motor 4 Disconnect the ground wi...

Страница 21: ...CATCH WH 9 52 12 7 15 88 6 35 3PCS SET 1 1 2 1 1 1 2 2 1 1 1 1 1 1 1 3 1 1 2 1 1 1 2 2 1 1 1 1 1 1 1 3 1 1 2 1 1 1 2 2 1 1 1 1 1 1 1 3 MV MCFZ A12WV E02 227 303 E02 179 971 E02 179 100 E02 179 010 E02 179 000 E02 215 700 E02 179 237 E02 179 238 E02 151 666 E02 179 667 E02 138 666 E02 179 972 E02 138 667 E02 179 231 E02 227 235 E02 823 620 E02 824 620 E02 227 040 E02 179 142 No Part No Remarks Part...

Страница 22: ...CONTROLLER REMOTE CONTROLLER REMOTE CONTROLLER HOLDER SW THERMO P C BOARD E1 WH Q ty unit MCFZ A12WV E02 179 500 E02 179 505 E02 228 300 E02 229 300 E02 684 300 E02 842 375 E02 826 375 E02 823 375 E02 227 468 E02 327 307 E02 842 452 E02 875 452 E02 876 452 E02 215 328 E02 820 385 E02 127 382 No Part No Remarks Part name Symbol in Wiring Diagram E1 WH MCFZ A18WV E1 WH MCFZ A24WV 2PCS SET RB4V25 RB4...

Страница 23: ...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 deodorizing filter together Separate the deodorizing filter gray sponge type from the air filter Remove the air filter and the air cleaning filter toge...

Страница 24: ...change without notice C C Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Jun 2004 No OB344 REVISED EDITION A 6 Distributed in Apr 2004 No OB344 6 Made in Japan HEAD OFFICE MITSUBISHI DENKI BLDG 2 2 3 MARUNOUCHI CHIYODA KU TOKYO100 8310 JAPAN ...

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