Service manual

ManualsBrandsMitsubishi Electric ManualsDomestic AppliancesMCF-18TN

SERVICE MANUAL

CONTENTS

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

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

3. OUTLINES AND DIMENSIONS ·························6

4. WIRING DIAGRAM ············································8

5. REFRIGERANT SYSTEM DIAGRAM··············10

6. PERFORMANCE CURVES ······························11

7. MICROPROCESSOR CONTROL ····················14

8. SERVICE FUNCTIONS ····································23

9. TROUBLESHOOTING······································24

10. DISASSEMBLY INSTRUCTIONS·····················35

11. PARTS LIST······················································41

12. OPTIONAL PARTS···········································46

Wireless type

Models

MCFH-18TN-

(WH)

·MUCFH-18TN-

MCFH-24TN-

(WH)

·MUCFH-24TN-

S1S1

No. OB286

(When installed on the ceiling)

(When installed on the floor)

FLOOR AND CEILING TYPE AIR CONDITIONERS

OB286-1.qxp 02.7.23 11:04 AM Page 1

Summary of content (48 pages)

PAGE 1
OB286-1.qxp 02.7.23 11:04 AM Page 1 FLOOR AND CEILING TYPE AIR CONDITIONERS No. OB286 SERVICE MANUAL Wireless type Models MCFH-18TNMCFH-24TN- S1 (WH) S1 (WH) ·MUCFH-18TN·MUCFH-24TN- S1 S1 (When installed on the floor) CONTENTS (When installed on the ceiling) 1. PART NAMES AND FUNCTIONS······················2 2. SPECIFICATION·················································4 3. OUTLINES AND DIMENSIONS ·························6 4.
PAGE 2
OB286-1.qxp 1 02.7.23 11:04 AM Page 2 PART NAMES AND FUNCTIONS MCFH-18TN - MCFH-24TN - S1 S1 INDOOR UNIT ACCESSORIES (When installed on the floor) Vertical vanes Horizontal vane Operation indicator lamp Receiving section Front panel Air cleaning filter (white bellows type)(option) Air inlet 1 Installation plate Unit fixing screw 2 5 o 12mm 3 Wireless remote controller Remote controller 4 mounting hardware Fixing screw for 4 5 3.
PAGE 3
OB286-1.qxp 02.7.23 11:04 AM MCFH-18TN - S1 Page 3 MCFH-24TN - S1 REMOTE CONTROLLER Signal transmitting section Operation display section PM OPERATE /STOP (ON /OFF)button AM TOO ON/OFF WARM TOO COOL TEMPERATURE buttons Open the front lid. CLOCK PM AM TOO ON/OFF WARM VANE CONTROL button TOO COOL FAN STOP VANE START I FEEL COOL FAN SPEED CONTROL button OFF-TIMER button HEAT DRY ON-TIMER button MODE HR. OPERATION SELECT button MIN. HR. button MIN.
PAGE 4
OB286-1.qxp 2 02.7.23 11:04 AM Page 4 SPECIFICATION Model Function Power supply MCFH-18TN - S1 Cooling Heating Single phase, 220V, 60Hz SSA 385/386 W1 Capacity Electrical data Current Input JIS C 9612 (ISO 5151) Capacity Capacity Dehumidification Air flowW2 (High/Med.
PAGE 5
OB286-1.qxp 02.7.23 11:04 AM Page 5 MCFH-24TN - S1 Cooling Heating Single phase, 220V, 60Hz Model Function Power supply SSA 385/386 W1 Capacity Electrical data Current Input JIS C 9612 (ISO 5151) Capacity Capacity Dehumidification Air flowW2 (High/Med.
PAGE 6
OB286-1.qxp 02.7.23 11:04 AM 3 Page 6 OUTLINES AND DIMENSIONS MCFH-18TN - S1 MCFH-24TN - S1 Unit : mm 114 INDOOR UNIT (When installed on the floor) 50c 16 906 112.8 616.5 50cm or more 650 50cm or more 80.8 93 77 mo (When installed on the ceiling) rm 180 1100 58 Gas line 15.88 19 Liquid line 6.35 (MCFH-18) 9.52 (MCFH-24) 162 S1 100mm or more MUCFH-18TN - 143 113 50cm or more 42.
PAGE 7
02.7.23 11:04 AM MUCFH-24TN - Page 7 S1 Unit : mm 200 Outdoor Unit-Necessary surrounding clearance 17 185 15 Air outlet Front opening 500 Air intake Note:Allow adequate upper clearance 10 10 39.5 27.
PAGE 8
OB286-1.qxp 02.7.23 11:04 AM 4 Page 8 WIRING DIAGRAM MCFH-18TN - S1 MODEL WIRING DIAGRAM INDOOR UNIT TB GRN/YLW N BLU L 2 N WIRES 3 12V 4 3 C11 TRANS CN 101 CN 104 CN 113 CN 151 WHT 1 ORN 2 RED 3 BLK 4 YLW 5 YLW BLU BLU 6 BRN BRN 7 8 LDFL LDFVL ELECTRONIC CONTROL P.C.
PAGE 9
OB286-1.qxp 02.7.23 11:04 AM Page 9 MCFH-24TN - S1 MODEL WIRING DIAGRAM INDOOR UNIT TB GRN/YLW N BLU L BRN 4 3 2 1 2 CN 104 CN 101 CN 151 CN 113 LDFM LDFL SR143 SR142 SR141 F11 LDFVL ELECTRONIC CONTROL P.C. BOARD 4 6 SYMBOL C11 F11 HIC1 MF MV 5 SW/THERMO P.C.BOARD RT11 DISP/ RECEIVER P.C.BOARD MV NR11 RED WHT BLK ORN WHT RED C2 ORN 1 2 3 CN711 CN662 CN661 BLK YLW 6 5 4 3 2 1 CN721 1 2 3 SR62 SR61 X62 COM X62 NO 21S4 TAB52 X52 BLU CN730 DEICER P.C.
PAGE 10
OB286-1.qxp 5 02.7.23 11:04 AM Page 10 REFRIGERANT SYSTEM DIAGRAM Unit:mm MCFH-18TN - S1 MUCFH-18TN - S1 INDOOR UNIT OUTDOOR UNIT Refrigerant pipe [15.88 (Option) (with heat insulator) Indoor heat Distributor exchanger Flared connection 4-way valve Muffler Stop valve (with service port) Indoor coil thermistor RT12 Discharge pressure regurator open 2.55MPa Compressor (26.0kgf/F) Accumulator Room temperature thermistor RT11 Outdoor heat exchanger Strainer Capillary tube [3.0 o [1.
PAGE 11
OB286-1.qxp 02.7.23 11:04 AM Page 11 MAX. REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE MCFH-18TN MCFH-24TN - S1 S1 Piping size O.D. : mm (in.) Gas Liquid {6.35(1/4) {15.88(5/8) {9.52(3/8) Length : m(ft.) A Model MUCFH-18TN MUCFH-24TN - S1 15(49) S1 5m(16ft) w It does not matter which unit is higher. Max. Height difference * A: Refrigerant piping Max.
PAGE 12
OB286-1.qxp 02.7.23 11:04 AM Page 12 How to measure the indoor air wet-bulb/dry-bulb temperature difference 1. Attach at least 2 sets of wet and-dry-bulb thermometers to the indoor air inlet as shown in the figure, and at least 2 sets of wet and-dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high. 2. Attach at least 2 sets of wet and-dry-bulb thermometers to the outdoor air intake.
PAGE 13
02.7.23 11:04 AM Page 13 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). f [Gauge]) The conversion factor is : 1(MPa [Gauge]) =10.2(kgf/f MUCFH-18TN- MUCFH-24TN- S1 7 6 0.6 6 0.6 5 0.5 5 0.5 4 0.
PAGE 14
OB286-1.qxp 7 02.7.23 11:04 AM Page 14 MICROPROCESSOR CONTROL MCFH-18TN MCFH-24TN - S1 S1 MUCFH-18TN MUCFH-24TN - S1 S1 WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section PM OPERATE /STOP (ON /OFF)button AM TOO ON/OFF WARM TOO COOL 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.
PAGE 15
OB286-1.qxp 02.7.23 11:04 AM Page 15 (4) The initial set temperature is decided by the initial room temperature.
PAGE 16
OB286-1.qxp 02.7.23 11:04 AM Page 16 Operation chart Example ON ON OFF OFF Compressor Outdoor fan (continuously at set speed) ON Indoor fan 3. Outdoor fan control Ambient temperature Outdoor fan speed is controlled according to the temperature of ambient temperature thermistor RT63 temperature thermistor RT63. Outdoor fan Low operation : When the outside temperature decreases to 23°C or less. Outdoor fan speed Low Until when the outside temperature goes to 27°C or more.
PAGE 17
OB286-1.qxp 02.7.23 11:04 AM Page 17 (2) Cold air prevention control The fan runs at set speed when the indoor coil thermistor RT12 temperature exceeds 22°C. The fan operates at Very Low when the temperature is below 18°C. But the fan stops when the indoor fan operates at Very Low and the temperature is 15°C or less. Released Cold Air Prevention 18°C 22°C NOTE : If the temperature of RT12 reads from 18°C to 22°C at the air conditioner starting and also after defrosting, this control works.
PAGE 18
OB286-1.qxp 02.7.23 11:04 AM Page 18 4. Defrosting Defrosting of outdoor heat exchanger is controlled by DEICER P.C. board, with detection by the defrost thermistor RT61. (1) Defrost starting conditions When all conditions of a) ~ c) are satisfied, the defrosting operation starts. a) Under the heat operation, the compressor cumulative operation time exceeds 40 minutes without the defrosting operation working. b) The defrost thermistor RT61 reads - 3°C or less.
PAGE 19
02.7.23 11:04 AM Page 19 7-2. COOL OPERATION (1) Press OPERATE/STOP (ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with the OPERATION SELECT button. (3) Press the TEMPERATURE buttons. (TOO WARM or TOO COOL button) The setting range is 16 ~ 31°C w Indoor fan continues to operate regardless of thermostat’s OFF-ON w Coil frost prevention is as same as COOL mode of “I FEEL CONTROL” 7-3. DRY OPERATION (1) Press OPERATE/STOP (ON/OFF) button.
PAGE 20
OB286-1.qxp 02.7.23 11:04 AM Page 20 (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 12 3 4 Vane angle is fixed to position 1. 5 4 2.In HEAT operation Vane angle is fixed to position 4. (5) STOP (operation OFF) and ON-TIMER standby. When the following cases occur, the vane returns to the closed position. (a).
PAGE 21
OB286-1.qxp 02.7.23 11:04 AM Page 21 7-6. TIMER OPERATION 1. How to set the timer (1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner. (2) Check that the current time is set correctly. NOTE : Timer operation will not work without setting the current time. Initially “AM0:00” blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK SET button. (3) Press TIMER CONTROL button to select the operation. “ON-TIMER” button...
PAGE 22
OB286-1.qxp 02.7.23 11:04 AM Page 22 7-7. EMERGENCY-TEST OPERATION In case of test run operation or emergency operation, use the EMERGENCY OPERATION switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of remote controller run down. The unit will start and the OPERATION INDICATOR lamp will light. The first 30 minutes of operation is the test run operation. This operation is for servicing.
PAGE 23
OB286-1.qxp 02.7.23 11:04 AM 8 Page 23 SERVICE FUNCTIONS MCFH-18TN MCFH-24TN - S1 S1 MUCFH-18TN MUCFH-24TN - S1 S1 8-1. COMPULSORY DEFROSTING MODE FOR SERVICE By short circuit of the connector JP607 and R853(MUCFH-18TN)/ JPG1 and R871(MUCFH-24TN) on the outdoor deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction. (Refer to page 33 or 34.) Defrost thermistor RT61 must read below -3°C. 8-2.
PAGE 24
OB286-1.qxp 02.7.23 11:04 AM Page 24 Table 1 1 unit operation 2 units operation 3 units operation 4 units operation No. 1 unit No modification Same as at left Same as at left Same as at left No. 2 unit – Solder J1 Same as at left Same as at left No. 3 unit – – Solder J2 Same as at left No.
PAGE 25
OB286-1.qxp 02.7.23 11:04 AM Page 25 9-2. Instruction of troubleshooting Start Indoor unit operates. Outdoor unit doesn't operate normally. Indoor unit operates. Outdoor unit doesn't operate. Outdoor unit doesn't operate even in Test Run operation. Outdoor unit operates in only Test Run operation. Refer to D "Check of outdoor unit" on page 28 or 29. Check room temperature thermistor. Refer to "Test point diagram and voltage" on page 32. Flash on and off at 0.
PAGE 26
OB286-1.qxp 02.7.23 11:04 AM Page 26 2. Trouble criterion of main parts MCFH-18TN MCFH-24TN Part name Room temperature thermistor (RT11) Indoor coil thermistor (RT12) Defrost thermistor (RT61) Ambient temperature thermistor (RT63) Compressor (MC) INNER PROTECTOR 165i 8: ON 102i15: OFF S1 S1 MUCFH-18TN MUCFH-24TN - S1 S1 Check method and criterion Figure Measure the resistance with a tester.
PAGE 27
OB286-1.qxp 02.7.23 11:04 AM Page 27 Indoor fan motor does not operate. A Check of indoor fan motor Turn OFF power supply. Check connector (Fan motor) visually. No Yes Is soldered point of the connector correctly soldered? Are lead wires connected? No Yes Re-connect the lead wires. Re-solder it. Disconnect lead wires from connector (Fan motor) on indoor electronic control P.C. board. Measure resistance between lead wires No.1 and No.4 and then No.3 and No.4 of the fan motor.
PAGE 28
OB286-1.qxp 02.7.23 11:04 AM Page 28 The unit doesn’t 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. Replace the indoor electronic control P.C. board. Be sure to check both fuse and varistor in any case.
PAGE 29
OB286-1.qxp 02.7.23 11:04 AM Start Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch. 3-minute time delay works. Test run operation operates for 30 minutes. Compressor doesn't operate. Is there 5V DC between No J101 + - J401 on the deicer P.C. board? w1 Yes Is there 220V AC between CN730 1 - 3 on the deicer P.C. board? w1 Yes No Make the connection of wiring correct. Replace the deicer P.C. board.
PAGE 30
OB286-1.qxp 02.7.23 11:04 AM Page 30 Compressor and / or outdoor fan motor does not stop. E Check of outdoor unit 1 Turn OFF the power supply. 2 After 30 seconds, turn ON the power supply again. 3 Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch. 4 Operate the unit for 1 minute or more and stop it by pressing the EMERGENCY OPERATION switch again.
PAGE 31
OB286-2.qxp 02.7.23 11:06 AM Page 31 When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second or flashes once. Outdoor unit doesn’t operate. G How to check mis-wiring and serial signal error (when outdoor unit does not work) Start 1. Turn OFF the power supply. 2. Turn ON the power supply. 3. Press the EMERGENCY OPERATION switch. 3 min.
PAGE 32
OB286-2.qxp 02.7.23 11:06 AM Page 32 TEST POINT DIAGRAM AND VOLTAGE MCFH-18TN - S1 MCFH-24TN - S1 Indoor electronic control P.C. board Fan motor power supply 220V AC Very Low Med. Low 7 5 6 High 4 3 2 1 8 Fuse 250V AC 3.
PAGE 33
OB286-2.qxp 02.7.23 11:06 AM Page 33 Power supply input 220V AC + CN661 1-2 Defrost thermistor (RT61) (Refer to page 30.) } } } R601 5~10V DC } Fan motor CN721 1-3 R.V. coil 220V AC } MUCFH-18TN - S1 Outdoor deicer P.C. board Fuse 2A/250V Defrost interval time short pin (JP607,R853) (Refer to page 23.) + J9 J8 } 5V DC (Refer to page 31.) + } } 12V DC + 52C 12V DC 33 Jumper wire for change in defrost setting (JPC, JPE) (Refer to page 23.
PAGE 34
OB286-2.qxp 02.7.23 11:06 AM Page 34 MUCFH-24TN - S1 Outdoor deicer P.C. board Defrost thermistor (RT61) Ambient temperature thermistor (RT63) 100 Resistance(k") 90 80 70 60 50 40 30 20 10 0 -20 -10 0 10 20 30 40 Temperature(:) Defrost interval time short pin (JPG1,R871) (Refer to page 23.) CN661 1-2 Defrost temperature thermistor (RT61) (Refer to page 30.) CN662 3-4 Ambient temperature thermistor (RT63) (Refer to page 30.) Fan motor CN721 1-3 R.V. coil } 220V AC + } 12V DC Fuse 3.
PAGE 35
OB286-2.qxp 02.7.23 11:07 AM 10 Page 35 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. (1) Slide the sleeve and check if there is a locking lever or not.
PAGE 36
OB286-2.qxp 02.7.23 11:07 AM Page 36 OPERATING PROCEDURE PHOTOS 3. Removing the indoor heat exchanger. Photo 5 (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 37
OB286-2.qxp 02.7.23 11:07 AM Page 37 10-2. MUCFH-18TN - S1 OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet (1) Remove the screws of the cabinet. (2) Hold the down of the cabinet on the both side to remove the cabinet. Photo 1 Photo 2 Screws Service panel Screws 2. Removing the deicer P.C. board Photo 3 (1) Remove the service panel and the cabinet. (2) Disconnect all the connectors and the terminals on the deicer P.C. board. (3) Remove the deicer P.C. board. Screws Deicer P.C.
PAGE 38
OB286-2.qxp 02.7.23 11:07 AM Page 38 OPERATING PROCEDURE PHOTOS Photo 4 3. Removing the outdoor fan motor (1) Remove the cabinet. (Refer to 1) (2) Disconnect the connector remove the clamp of fan motor lead wire. (3) Remove the propeller fun nut and remove the propeller fan. (4) Remove screws fixing the fan motor. Propeller fan Set screws of the outdoor fan motor Lead clamps Outdoor fan motor Propeller fan nut Set screws of the outdoor fan motor 4.
PAGE 39
OB286-2.qxp 02.7.23 11:07 AM Page 39 10-3. MUCFH-24TN - S1 OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet (1) Remove the screws of the top panel and the top panel. (2) Remove the screw of the service panel. To remove the service panel, pull it down toward you and unhook the catches on the both sides. (3) Remove the screw of the cover panel. To remove the cover panel. (4) Remove the screws of the cabinet. Open the cabinet to a 45-degree angle.
PAGE 40
OB286-2.qxp 02.7.23 11:07 AM Page 40 OPERATING PROCEDURE PHOTOS 4. Removing the heat exchanger and compressor (1) Remove the screws of the rear panel. Remove the screws of the valve bed and the valve bed. (The valve bed is fixed by the catches on the right and left sides. Lift it to remove.) Open the rear panel to the rear to remove. NOTE : All panels are fixed by catches, and must be removed by up and down. (2) Remove the screws of the side panel and the side panel.
PAGE 41
OB286-2.qxp 02.7.23 11:07 AM 11 Page 41 PARTS LIST MCFH-18TN - S1 (WH) MCFH-24TN - S1 (WH) 11-1. INDOOR UNIT STRUCTURAL PARTS 15 1 14 13 2 12 3 11 4 10 9 5 7 8 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 42
OB286-2.qxp 02.7.23 11:07 AM Page 42 MCFH-18TN - S1 (WH) MCFH-24TN - S1 (WH) 11-2. INDOOR UNIT ELECTRICAL PARTS 11-3. ACCESSORY PARTS AND REMOTE CONTROLLER 7 8 6 11 12 5 1 3 4 2 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 Part No.
PAGE 43
OB286-2.qxp 02.7.23 11:07 AM Page 43 MUCFH-18TN - S1 11-4. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS DEFROST THERMISTOR 17 16 18 15 1 2 14 13 12 11 10 3 4 5 7 6 8 9 Part numbers that are circled are 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 24 25 Part No.
PAGE 44
OB286-2.qxp 02.7.23 11:07 AM Page 44 MUCFH-24TN - S1 11-5.
PAGE 45
OB286-2.qxp 02.7.23 11:07 AM Page 45 MUCFH-24TN - S1 11-5. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. No. Part No.
PAGE 46
OB286-2.qxp 12 02.7.23 11:07 AM Page 46 OPTIONAL PARTS 12-1. REFRIGERANT PIPES The air conditioner has flared connections its indoor and outdoor sides. Please use the optional extension pipe as follows. Model MCFH-18TNMUCFH-18TN- MCFH-24TNMUCFH-24TN- S1 S1 S1 S1 , Part No. Pipe length MAC-670PI MAC-671PI MAC-672PI MAC-673PI MAC-674PI MAC-860PI MAC-861PI MAC-862PI MAC-863PI MAC-864PI 3m 5m 7m 10m 15m 3m 5m 7m 10m 15m 12-2. AIR CLEANING FILTER Cross-section Pipe size O.D mm (in.
PAGE 47
OB286-2.qxp 02.7.
PAGE 48
OB286-2.qxp 02.7.23 11:07 AM Page 48 HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C Copyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Oct. 2001. No.OB286 272 Made in Japan New publication, effective Oct. 2001 Specifications subject to change without notice.