Service manual

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SERVICE MANUAL

FLOOR AND CEILING TYPE AIR CONDITIONERS

CONTENTS

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

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

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

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

5. OUTLINES AND DIMENSIONS ·························7

6. WIRING DIAGRAM ············································9

7. REFRIGERANT SYSTEM DIAGRAM··············12

8. PERFORMANCE CURVES······························14

9. MICROPROCESSOR CONTROL ····················28

10. SERVICE FUNCTIONS·····································34

11. TROUBLESHOOTING······································35

12. DISASSEMBLY INSTRUCTIONS·····················41

13. PARTS LIST······················································47

14. OPTIONAL PARTS ······················BACK COVER

Wireless type

Models

MCF-13NV-

(WH)

·MUCF-13NV-

MCF-18NV-

(WH)

·MUCF-18NV-

MCF-24NV-

(WH)

·MUCF-24NV-

E3E3

E4E4

No. OB270

(When installed on the ceiling)

(When installed on the floor)

W As for parts lists, all sub number’s series are included.

OB270--1.qxp 01.4.13 4:14 PM Page 1

Summary of content (52 pages)

PAGE 1
OB270--1.qxp 01.4.13 4:14 PM Page 1 FLOOR AND CEILING TYPE AIR CONDITIONERS No. OB270 SERVICE MANUAL Wireless type Models MCF-13NVMCF-18NVMCF-24NV- E4 (WH) E3 (WH) E3 (WH) ·MUCF-13NV·MUCF-18NV·MUCF-24NV- E4 E3 E3 (When installed on the floor) CONTENTS (When installed on the ceiling) 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················2 3. SPECIFICATION·················································4 4.
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OB270--1.qxp 1 4/13/01 2:59 PM Page 2 TECHNICAL CHANGES MCF-13NV- E3 · MUCF-13NV- E3 MCF-13NV- E4 · MUCF-13NV- E4 1. Remote controller has changed. SWING button is removed, but SWING MODE function is available by VANE CONTROL button. MCF-18NV- E2 · MUCF-18NV- E2 MCF-18NV- E3 · MUCF-18NV- E3 1. Remote controller has changed. SWING button is removed, but SWING MODE function is available by VANE CONTROL button. MCF-24NV- E2 · MUCF-24NV- E2 MCF-24NV- E3 · MUCF-24NV- E3 1.
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OB270--1.qxp 4/13/01 2:59 PM MUCF-13NV - Page 3 MUCF-18NV - E4 E3 MUCF-24NV - E3 OUTDOOR UNIT OUTDOOR UNIT Air inlet (back and side) Air inlet Piping Piping Drain hose Drain hose Air outlet Air outlet Drain outlet Drain outlet MCF-13NV - E4 MCF-18NV - E3 MCF-24NV - E3 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. Open the front lid.
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OB270--1.qxp 3 4/13/01 2:59 PM Page 4 SPECIFICATION Indoor model Function MCF-13NV - E4 Cooling Single phase 220-240V, 50Hz 3.7 1.6 678 10 6.3-6.3 1,310-1,380 Capacity Power supply Fan motor Electrical data Capacity kW Dehumidification R/h Air flow(High) K /h Power outlet A Running current A Power input W Auxiliary heater A(kW) Power factor % Starting current A Fan motor current A Coefficient of performance(C.O.P) Model Winding " resistance(at20:) 95-91 35-38 0.56-0.58 2.82-2.
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OB270--1.qxp 4/13/01 2:59 PM 4 Page 5 NOISE CRITERIA CURVES NOISE CRITERIA CURVES MCF-13NV - MUCF-13NV - E4 SPEED SPL(dB(A)) High 43-44 LINE Test conditions, Cooling : DB 27: OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.
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OB270--1.qxp 4/13/01 2:59 PM MCF-24NV - Page 6 MUCF-24NV - E3 SPEED SPL(dB(A)) High 48 LINE Test conditions, Cooling : DB 27: OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.
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OB270--1.qxp 4/13/01 2:59 PM 5 Page 7 OUTLINES AND DIMENSIONS MCF-18NV - E4 Unit: mm E3 E3 114 MCF-13NV MCF-24NV - INDOOR UNIT 80.8 16 906 112.8 (When installed on the floor) 50c 616.5 50cm or more 650 50cm or more 93 77 m o (When installed on the ceiling) rm 143 113 50cm or more 42.5 100cm or more 170 ore 180 1100 58 19 162 Liquid line [6.35 (MCF-13/18) [9.52 (MCF-24) Gas line [12.7 (MCF-13) [15.
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4/13/01 2:59 PM MUCF-18NV - E3 Page 8 MUCF-24NV - Unit: mm E3 100mm or more OB270--1.qxp OUTDOOR UNIT 100 mm or m or m ore 20 290 310 345 248 35 350 ore mm 100 ore rm mo m 500 35 0m or mo re Drainage 3holes [33 30 605 Service panel 30 157 100 292 20 m 50 133 500 850 35 161 74 8 Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35(MUCF-18) [9.52(MUCF-24) Gas refrigerant pipe joint Refrigerant pipe (flared) [15.
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OB270--1.qxp 4/13/01 2:59 PM 6 Page 9 WIRING DIAGRAM MODEL MCF-13NV- INDOOR UNIT E4 TB CIRCUIT BREAKER PE GRN/YLW N BLU CN 112 HIC1 L BRN 3 2 ~/N 220-240V 1 50Hz 3 NR11 POWER SUPPLY 4 52C SR143 N 220-240V~ 2 RT12 WHT LDC11 ORN 2 RED 3 BLK LDFH LDFM LDFL 1 4 YLW 5 BLU 6 7 CN 104 CN 101 BLU MF 8 ELECTRONIC CONTROL P.C BOARD GRN/YLW 5 6 MV 5 DISP/ RECEIVER P.C.
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OB270--1.qxp 4/13/01 2:59 PM Page 10 MODEL MCF-18NV- INDOOR UNIT E3 TB CIRCUIT BREAKER PE GRN/YLW N BLU L BRN 3 2 ~/N 220-240V 1 50Hz 4 3 52C RT12 WHT LDC11 ORN 2 RED 3 BLK LDFH 1 4 YLW 5 BLU 6 LDFM LDFL 7 CN 104 CN 101 5 WHT CN 151 CN 113 MF 8 ELECTRONIC CONTROL P.C BOARD GRN/YLW 6 5 DISP/ RECEIVER P.C.
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OB270--1.qxp 4/13/01 2:59 PM Page 11 MODEL MCF-24NV- INDOOR UNIT E3 TB CIRCUIT BREAKER PE GRN/YLW N BLU CN 112 HIC1 L BRN 3 2 ~/N 220-240V 1 50Hz 3 52C 3 BLU CN 101 CN 113 CN 104 CN 151 WHT LDCOM WHT LDC11 ORN 2 RED 3 BLK LDC12 LDFH 1 4 YLW 5 BLU 6 LDFM LDFL 5 WHT ORN RED BLK YLW BLU BRN 8 ELECTRONIC CONTROL P.C BOARD GRN/YLW 6 4 MV SW/THERMO P.C.BOARD AUTO RESTART ASSY RT11 SYMBOL NAME C11 INDOOR FAN MOTOR CAPACITOR F11 FUSE (3.
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OB270--1.qxp 7 4/13/01 2:59 PM Page 12 REFRIGERANT SYSTEM DIAGRAM Unit:mm MCF-13NV MUCF-13NV E4 INDOOR UNIT Refrigerant pipe [12.7 (With heat insulation) Indoor heat exchanger Indoor coil thermistor RT12 OUTDOOR UNIT Stop valve (with service port) Distributor Flared connection Stop valve [3.0✕[1.6✕ 300 Refrigerant flow MUCF-18NV E3 Refrigerant pipe {15.88 (With heat insulation) Indoor heat exchanger Indoor coil thermistor RT12 Strainer Capillary tube Refrigerant pipe [6.
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OB270--1.qxp 4/13/01 2:59 PM Page 13 MCF-24NV MUCF-24NV E3 INDOOR UNIT Refrigerant pipe {15.88 (With heat insulation) Indoor heat exchanger Indoor coil thermistor RT12 Distributor Unit:mm E3 OUTDOOR UNIT Accumulator Stop valve (with service port) Flared connection Outdoor heat exchanger Compressor Room temperature thermistor RT11 Capillary tube {3.0✕{2.0✕ 700 Stop valve Refrigerant pipe {9.52 (With heat insulation) Strainer Capillary tube Discharge {3.0✕{1.
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OB270--1.qxp 8 4/13/01 2:59 PM Page 14 PERFORMANCE CURVES The standard data contained in these specifications apply only to the operation of the air conditioner under normal condition. Operating conditions vary according to the areas where these units are installed. The following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
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OB270--1.qxp 4/13/01 2:59 PM Page 15 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation 1 Both indoor and outdoor units are under the same temperature/humidity condition. Dry Bulb temperature (˚C) 20 25 30 Relative humidity (%) 50 60 70 2 Air flow should be set at MAX.. 3 The unit of pressure has been changed to MPa on the international system of units(SI unit system). The converted score against the traditional unit system can be gotten according to the formula below.
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OB270--1.qxp 4/13/01 2:59 PM Page 16 PERFORMANCE DATA COOL operation(220V) MCF-13NV - E4 :MUCF-13NV - E4 CAPACITY : 3.7(kW) SHF : 0.70 INPUT : 1310(W) OUTDOOR DB(;) INDOOR INDOOR DB(;) WB(;) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 Q 4.
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OB270--1.qxp 4/13/01 2:59 PM Page 17 PERFORMANCE DATA COOL operation(220V) MCF-13NV - E4 :MUCF-13NV - E4 CAPACITY : 3.7(kW) SHF : 0.70 INPUT : 1310(W) OUTDOOR DB(;) INDOOR INDOOR DB(;) WB(;) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 Q 3.
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OB270--1.qxp 4/13/01 2:59 PM Page 18 PERFORMANCE DATA COOL operation(240V) MCF-13NV - E4 :MUCF-13NV - E4 CAPACITY : 3.7(kW) SHF : 0.70 INPUT : 1380(W) INDOOR INDOOR DB(;) WB(;) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 Q 4.35 4.53 4.35 4.
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OB270--1.qxp 4/13/01 2:59 PM Page 19 PERFORMANCE DATA COOL operation(240V) MCF-13NV - E4 :MUCF-13NV - E4 CAPACITY : 3.7(kW) SHF : 0.70 INPUT : 1380(W) INDOOR INDOOR DB(;) WB(;) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 Q 3.63 3.81 3.63 3.
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OB270--1.qxp 4/13/01 2:59 PM Page 20 PERFORMANCE DATA COOL operation(220V) MCF-18NV - E3 :MUCF-18NV - E3 CAPACITY : 5.0(kW) SHF : 0.67 INPUT : 1920(W) OUTDOOR DB(;) INDOOR INDOOR DB(;) WB(;) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 Q 5.
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OB270--1.qxp 4/13/01 2:59 PM Page 21 PERFORMANCE DATA COOL operation(220V) MCF-18NV - E3 :MUCF-18NV - E3 CAPACITY : 5.0(kW) SHF : 0.67 INPUT : 1920(W) INDOOR INDOOR DB(;) WB(;) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 Q 4.90 5.15 4.90 5.
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OB270--1.qxp 4/13/01 2:59 PM Page 22 PERFORMANCE DATA COOL operation(240V) MCF-18NV - E3 :MUCF-18NV - E3 CAPACITY : 5.0(kW) SHF : 0.67 INPUT : 2010(W) OUTDOOR DB(;) INDOOR INDOOR DB(;) WB(;) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 Q 5.
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OB270--1.qxp 4/13/01 2:59 PM Page 23 PERFORMANCE DATA COOL operation(240V) MCF-18NV - E3 :MUCF-18NV - E3 CAPACITY : 5.0(kW) SHF : 0.67 INPUT : 2010(W) OUTDOOR DB(;) INDOOR INDOOR DB(;) WB(;) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 Q 4.
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OB270--1.qxp 4/13/01 2:59 PM Page 24 PERFORMANCE DATA COOL operation(220V) MCF-24NV - E3 :MUCF-24NV - E3 CAPACITY : 6.4(kW) SHF : 0.63 INPUT : 2870(W) INDOOR INDOOR DB(;) WB(;) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 Q 7.52 7.84 7.52 7.
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OB270--1.qxp 4/13/01 2:59 PM Page 25 PERFORMANCE DATA COOL operation(220V) MCF-24NV - E3 :MUCF-24NV - E3 CAPACITY : 6.4(kW) SHF : 0.63 INPUT : 2870(W) INDOOR INDOOR DB(;) WB(;) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 Q 6.27 6.59 6.27 6.
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OB270--1.qxp 4/13/01 2:59 PM Page 26 PERFORMANCE DATA COOL operation(240V) MCF-24NV - E3 :MUCF-24NV - E3 CAPACITY : 6.4(kW) SHF : 0.63 INPUT : 2970(W) INDOOR INDOOR DB(;) WB(;) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 Q 7.52 7.84 7.52 7.
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OB270--1.qxp 4/13/01 2:59 PM Page 27 PERFORMANCE DATA COOL operation(240V) MCF-24NV - E3 :MUCF-24NV - E3 CAPACITY : 6.4(kW) SHF : 0.63 INPUT : 2970(W) INDOOR INDOOR DB(;) WB(;) 21 18 21 20 22 18 22 20 22 22 23 18 23 20 23 22 24 18 24 20 24 22 24 24 25 18 25 20 25 22 25 24 26 18 26 20 26 22 26 24 26 26 27 18 27 20 27 22 27 24 27 26 28 18 28 20 28 22 28 24 28 26 29 18 29 20 29 22 29 24 29 26 30 18 30 20 30 22 30 24 30 26 31 18 31 20 31 22 31 24 31 26 32 18 32 20 32 22 32 24 32 26 Q 6.27 6.59 6.27 6.
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OB270--1.qxp 4/13/01 2:59 PM 9 Page 28 MICROPROCESSOR CONTROL MCF-13NV MCF-24NV - E4 MCF-18NV - MUCF-13NV MUCF-24NV - E3 E3 WIRELESS REMOTE CONTROLLER Signal transmitting section E4 MUCF-18NV - E3 Once the operation mode are set, the same operation mode can be repeated by simply turning the OPERATE/STOP (ON/OFF) button ON. Indoor unit receives the signal with a beep tone.
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OB270--1.qxp 4/13/01 2:59 PM Page 29 (4) The initial set temperature is decided by the initial room temperature.
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OB270--1.qxp 4/13/01 2:59 PM Page 30 ON ON Compressor and Outdoor fan motor Indoor fan motor OFF OFF ON (continuously at set speed) —DRY mode of “I FEEL CONTROL”— The system for dry operation uses the same refrigerant circuit as the cooling circuit. The compressor and the indoor fan are controlled by the temperature. By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease. 1.
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OB270--2.qxp 4/13/01 3:03 PM 9-3. DRY ( Page 31 ) OPERATION (1) Press OPERATE/STOP button. Power monitor lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode. (3) The microprocessor reads the room temperature and determines the set temperature. Set temperature is as shown in the right chart. Thermostat (SET TEMP.)does not work. The other operations are same as DRY mode of “I FEEL CONTROL”. (4) DRY operation will not work when the room temperature is 13°C or below. 9-4.
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OB270--2.qxp 4/13/01 3:03 PM Page 32 (4) VANE AUTO ( ) mode In VANE AUTO mode, the microprocessor automatically determines the vane angle and operation to make the optimum room-temperature distribution. 1 1.In COOL and DRY operation 1 2 Vane angle is fixed to position 1. 2.In FAN operation 3 4 5 4 Vane angle is fixed to position 4.
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OB270--2.qxp 4/13/01 3:03 PM Page 33 PROGRAM TIMER ➝ ➝ ● The OFF timer and ON timer can be used in combination. ● “ ” and “ ” display show the order of the OFF timer and ON timer operation. (Example 2) The current time is 11:00 AM. (Example 1) The current timer is 8:00 PM. The unit turns on at 5:00 PM, and off at 9:00 PM. The unit turns off at 11:00 PM, and on at 6:00 AM. PM PM AM PM 9-7.
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OB270--2.qxp 4/13/01 3:03 PM 10 Page 34 SERVICE FUNCTIONS MCF-13NV - E4 MCF-24NV - E3 MCF-18NV - E3 MUCF-13NV - E4 MUCF-24NV - E3 MUCF-18NV - E3 10-1. 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 40.) 3-minute time delay : 3-minute → 3-second AUTO START : 1 hour → 1-minute AUTO STOP : 1 hour → 1-minute 10-2. P.C.
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OB270--2.qxp 4/13/01 3:03 PM 11 Page 35 TROUBLESHOOTING MCF-13NV - E4 MCF-18NV - E3 MCF-24NV - E3 MUCF-13NV - E4 MUCF-18NV - E3 MUCF-24NV - E3 11-1. CAUTIONS ON TROUBLESHOOTING 11-1-1. Before troubleshooting, check the followings: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring. 11-1-2. Take care the followings during servicing.
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OB270--2.qxp 4/13/01 3:03 PM Page 36 11-2. 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 40. When the remote controller is pressed or when the EMERGENCY OPERATION switch is pressed, the fan doesn't rotate, with Power monitor lamp on.
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OB270--2.qxp 4/13/01 3:03 PM Page 37 11-2-2. Trouble criterion of main parts MCF-13NV - E4 , MCF-18NV - E3 MCF-24NV - E3 MUCF-13NV - E4 , MUCF-18NV - E3 MUCF-24NV - E3 Part name Room temperature thermistor (RT11) Check method and criterion Figure Measure the resistance with a tester. (Part temperature 10°C ~ 30°C) Indoor coil thermistor (RT12) Normal Abnormal 8kΩ ~ 20kΩ Opened or short-circuited Measure the resistance between the terminals with a tester.
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OB270--2.qxp 4/13/01 3:03 PM Page 38 A Check of indoor fan motor Turn OFF power supply. Check connector (Fan motor) visually. Indoor fan does not operate. No No Yes Are lead wires connected? Is soldered point normal? Yes Reconnect the lead wires. Resolder it. Disconnect lead wires from connector (Fan motor). Measure resistance between lead wires No.1 and No.4 and then No.3 and No.4 of the fan motor.
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OB270--2.qxp 4/13/01 3:03 PM Page 39 C Check of indoor electronic control P.C. board The unit doesn’t operate with the remote controller. Also, the Operation indicator lamp doesn’t light up by pressing the EMERGENCY OPERATION switch. Replace the fuse. Yes No Is fuse(F11)blown? Check both “parts side”and “pattern side” of indoor electronic control P.C. board visually. Trouble of the indoor electronic control P.C. board. Be sure to check both fuse and varistor in any case.
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OB270--2.qxp 4/13/01 3:04 PM Page 40 TEST POINT DIAGRAM AND VOLTAGE MCF-13NV - E4 MCF-18NV - E3 MCF-24NV - E3 Indoor electronic control P.C. board Fan motor power supply 220-240V AC (Refer to page 38) 8 7 Med. Low High 5 6 4 3 2 1 Fuse 250V AC 3.15A Power supply input 220-240V AC + – + – } } 12V DC 5V DC JHA (Release of AUTO RESTART FUNCTION. Refer to page 34.
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OB270--2.qxp 4/13/01 3:04 PM 12 Page 41 DISASSEMBLY INSTRUCTIONS <"Terminal with lock mechanism" Detaching points> In the case of terminal with lock mechanism, detach the terminal as shown below. (1) (2) 1Slide the sleeve. 2Pull the terminal while pushing the locking lever. 12-1.MCF-13NV- E4 MCF-18NVINDOOR UNIT E3 1Hold the sleeve, and pull out the terminal slowly. MCF-24NV- E3 OPERATING PROCEDURE PHOTOS 1. Removing the electronic control P. C . board.
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OB270--2.qxp 4/13/01 3:04 PM Page 42 OPERATING PROCEDURE PHOTOS 3. Removing the indoor heat exchanger. Photo 5 (1) Remove the grill. (Refer to 1(1) (2)) (2) Remove the screws on both sides 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 .
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OB270--2.qxp 4/13/01 3:04 PM Page 43 12-2. MUCF-13NV - E4 OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet (1) (2) (3) (4) Remove the Remove the Remove the Remove the support. (5) Remove the the insides. (6) Remove the (7) Remove the screws securing the top panel. screw securing the service panel. screws securing the cabinet. screws securing the front panel and motor Photo 1 Screws for front panel and motor support service panel, and remove the screw from top panel. cabinet.
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OB270--2.qxp 4/13/01 3:04 PM Page 44 OPERATING PROCEDURE PHOTOS 3. Removing the propeller fan and the outdoor fan motor (1) Remove the cabinet. (Refer to 1.) (2) Remove the propeller fan nut. (3) Remove the propeller fan. NOTE : Loose the propeller fan in the rotating direction for removal. When attaching the propeller fan, align the mark on the propeller fan and the motor shaft cut section. Set the propeller fan in position by using the cut on the shaft and the mark on the propeller fan.
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OB270--2.qxp 4/13/01 3:04 PM Page 45 12-3. MUCF-18NV- E3 MUCF-24NV- E3 OPERATING PROCEDURE PHOTOS 1. Removing the cabinet (1) Remove the screws securing the cabinet. (2) Remove the screw securing the service panel. (3) Remove the service panel, and remove the screw from the insides. (4) Remove the cabinet. Photo 1 Photo 2 Screws Service panel Screw Screws 2. Removing the electrical parts (1) Remove the cabinet . (Refer to 1) (2) Remove the following parts .
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OB270--2.qxp 4/13/01 3:04 PM Page 46 OPERATING PROCEDURE PHOTOS 3. Removing the outdoor fan motor (1) Remove the cabinet. (Refer to 1) (2) Disconnect the connector to remove the clamp of fan motor lead wire. (3) Remove the propeller nut and remove the propeller. (4) Remove screws securing the fan motor. Photo 4 Propeller 4. Removing the compressor (1) (2) (3) (4) (5) (6) (7) (8) (9) Remove the cabinet. (Refer to 1) Remove the soundproof felt. Remove the terminal cover on the compressor.
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OB270--2.qxp 4/13/01 3:04 PM 13 Page 47 PARTS LIST 13-1. INDOOR UNIT STRUCTURAL PARTS MCF-13NV - E1 (WH) MCF-13NV MCF-18NV - E1 (WH) MCF-18NV MCF-24NV - E1 (WH) MCF-24NV - E2 E2 E2 (WH) MCF-13NV (WH) MCF-18NV (WH) MCF-24NV - 15 E3 E3 E3 (WH) MCF-13NV (WH) (WH) 14 (WH) E4 13 1 12 11 2 10 3 9 4 8 5 7 6 Part number that are circled is not shown in the illustration. No. Part No.
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OB270--2.qxp 4/13/01 3:05 PM Page 48 MCF-13NV - E1 (WH) MCF-13NV MCF-18NV - E1 (WH) MCF-18NV MCF-24NV - E1 (WH) MCF-24NV 13-2. INDOOR UNIT ELECTRICAL PARTS 9 8 7 (WH) MCF-13NV - E3 (WH) MCF-13NV - E4 (WH) (WH) MCF-18NV - E3 (WH) (WH) MCF-24NV - E3 (WH) 13-3. ACCESSORY AND REMOTE CONTROLLER PARTS E2 E2 E2 5 6 4 14 15 B A 1 2 C 3 13-2. INDOOR UNIT ELECTRICAL PARTS Part numbers that are circled is not shown in the illustration. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 Part No.
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OB270--2.qxp 4/13/01 3:05 PM Page 49 13-3. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS MUCF-13NV - E3 MUCF-13NV - E4 17 16 1 2 3 4 15 5 14 13 6 7 8 9 10 11 12 Part numbers that are 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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OB270--2.qxp 4/13/01 3:05 PM Page 50 13-4.
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OB270--2.qxp 4/13/01 3:05 PM Page 51 13-4. OUTDOOR UNIT STRUCTURAL PARTS Part numbers that are 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 20 21 22 23 Part No.
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OB270--2.qxp 14 4/13/01 3:05 PM Page 52 OPTIONAL PARTS 14-1. 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.