Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Model
MSH-C18TV -
MSH-C24TV -
MSH-C18TV -
E1
MSH-C24TV -
E1
· MUH-C18TV -
( WH )
E1
· MUH-C24TV -
( WH )
E1
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················5
4. NOISE CRITERIA CURVES ·······························8
5. OUTLINES AND DIMENSIONS ························ 9
6. WIRING DIAGRAM···········································11
7. REFRIGERANT SYSTEM DIAGRAM ··············13
8. PERFORMANCE CURVES ······························15
9. MICROPROCESSOR CONTROL ····················23
10. SERVICE FUNCTIONS·····································33
11. TROUBLESHOOTING ······································35
12. DISASSEMBLY INSTRUCTIONS·····················47
13. PARTS LIST······················································53
14. OPTIONAL PARTS···········································58
No. OB279
HFC
utilized
R407C
E1
E1
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Summary of Contents for Mitsubishi Electric MSH-C18TV
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Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS No. OB279 utilized SERVICE MANUAL R407C Wireless type Model MSH-C18TV - · MUH-C18TV - ( WH ) MSH-C24TV - · MUH-C24TV - ( WH ) CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················5 3. -
Page 2: Technical Changes
TECHNICAL CHANGES MSH-C18SV - MSH-C18TV - 1. Rated voltage has changed to 230V. 2. Remote controller has changed. • SLEEP MODE function has been removed. • ECONO COOL operation has added. • SWING button has been removed, but SWING MODE function has available by VANE CONTROL button. -
Page 3: Specification·················································7
INFORMATION FOR THE AIR CONDITIONER WITH R-407C REFRIGERANT This room air conditioner adopts HFC refrigerant (R407C) which will never destroy the ozone layer. Pay attention to following points. 1 Take sufficient care not to allow water and other contaminations to enter the R407C refrigerant during storage and installation, since it is more susceptible to contaminations than HCFC (R22) refrigerant. - Page 4 1.Tools dedicated for the air conditioner with R407C refrigerant The following tools are required for R407C refrigerant. Some R22 tools can be substituted for R407C tools. Do not use tools that are used with R22 refrigerant in order to avoid mixing oils. Description R407C tools Can R22 tools be used?
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Page 5: Muh-C18Tv- E1
PART NAMES AND FUNCTIONS INDOOR UNIT MSH-C18TV - MSH-C24TV - Front panel (When the grille is open) OUTDOOR UNIT MUH-C18TV - MUH-C24TV - Air inlet (back and side) Air outlet Air inlet Piping Drainage hose Air outlet Drain outlet ACCESSORIES... -
Page 6: Remote Controller
REMOTE CONTROLLER MSH-C18TV - MSH-C24TV - Signal transmitting section Operation display section OPERATE /STOP (ON /OFF)button ON/OFF WARM COOL TEMPERATURE buttons Open the front lid. CLOCK ON/OFF WARM COOL FAN SPEED CONTROL button VANE CONTROL button STOP I FEEL COOL... -
Page 7: High
SPECIFICATION Indoor model MSH-C18TV - MSH-C24TV - Cooling Heating Function Cooling Heating Single phase Single phase Power supply 230V, 50Hz 230V, 50Hz Capacity — — Dehumidification Air flow(High) K /h Power outlet Running current 12.8 13.7 2,110 2,180 Power input... -
Page 8: Heating : Dry-Bulb Temperature 20: Wet-Bulb Temperature 15.5
NOISE CRITERIA CURVES MSH-C18TV- MSH-C24TV- NOTCH SPL(dB(A)) LINE NOTCH SPL(dB(A)) LINE High High Test conditions, Test conditions, Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5: Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5:... -
Page 9: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: mm MSH-C18TV - MSH-C24TV - Indoor unit 4holes 11 20 INDOOR UNIT Wall hole [75 Installation plate 1015 Installation plate Liquid line [8-0.5m Gas line [12-0.43m Air in Insulation [50 O.D [28 I.D Drain hose [16... -
Page 10: Outdoor Unit
MUH-C24TV- Unit: mm OUTDOOR UNIT Outdoor Unit-Necessary surrounding clearance Air intake Note:Allow adequate upper clearance Air intake Front opening Air outlet Terminal block for indoor and outdoor unit connection Service space Outlet guide installation hole Handle for moving Service panel Handle for moving Refrigerant-pipe flared connection [15.88... -
Page 11: Wiring Diagram
WIRING DIAGRAM MSH-C18TV - MODEL WIRING DIAGRAM INDOOR UNIT TO OUTDOOR UNIT CONNECTING RT12 HIC1 IC141 CN201 230V~ TRANS CN211 POWER SUPPLY CORD ~/N 230V RT11 ELECTRONIC CONTROL P.C. BOARD 50Hz GRN/YLW CIRCUIT BREAKER DISPLAY RECEIVER P.C. BOARD P.C. BOARD... -
Page 12: Indoor Unit
MSH-C24TV - MODEL WIRING DIAGRAM INDOOR UNIT TO OUTDOOR UNIT CONNECTING RT12 HIC1 IC141 RT11 CN201 230V~ TRANS CN211 POWER SUPPLY CORD ELECTRONIC CONTROL P.C. BOARD ~/N 230V 50Hz CIRCUIT BREAKER DISPLAY RECEIVER GRN/YLW P.C. BOARD P.C. BOARD REMOTE CONTROLLER SYMBOL NAME SYMBOL... -
Page 13: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit:mm MSH-C18TV - MUH-C18TV - OUTDOOR UNIT INDOOR UNIT 4- way valve Refrigerant pipe [15.88 (with heat insulator) Muffler Indoor coil Indoor thermistor Strainer Stop valve heat RT12 Outdoor exchanger (with service port) Distributor heat Defrost Flared connection... -
Page 14: High
MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Piping size O.D : mm Length of connecting pipe : m Model Max. length : m Outdoor unit Indoor unit Liquid MSH-C18TV - 6.35 MUH-C18TV - Gas 0.43 Gas 0 15.88 Liquid 0 Liquid 0.5 MSH-C24TV - 9.52... -
Page 15: Performance Curves
PERFORMANCE CURVES MSH-C18TV - MUH-C18TV - MSH-C24TV - MUH-C24TV - The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions, since operating conditions vary according to the areas where these units are installed. The following information has been pro- vided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve. - Page 16 31.1 36.1 28.7 33.3 26.3 30.5 24.0 27.7 21.6 25.0 19.2 22.2 16.8 19.4 14.4 16.6 NOTE:The above curves are for the heating operation without any frost and defrosting. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation 1 1 Both indoor and outdoor unit are under the same temperature/humidity condition. Relative humidity(%) Dry-bulb temperature 2 2 Air flow should be set at MAX.
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Page 17: Heat Operation
HEAT operation MUH-C18TV - Condition indoor:Dry bulb temperature 20.0°C Wet bulb temperature 14.5°C Outdoor:Dry bulb temperature 7,15,20°C 230V Wet bulb temperature 6,12,14.5°C Ambient temperature(˚C) MUH-C24TV - 230V Ambient temperature(˚C) - Page 18 PERFORMANCE DATA COOL operation MSH-C18TV - : MUH-C18TV - (230V) CAPACITY : 5.2(KW) SHF : 0.68 INPUT : 2110(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 6.11 3.06 0.50 1688 5.85...
- Page 19 PERFORMANCE DATA COOL operation MSH-C18TV - : MUH-C18TV - (230V) CAPACITY : 5.2(KW) SHF : 0.68 INPUT : 2110(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 2237 4.32 2.16 2279 5.10...
- Page 20 PERFORMANCE DATA COOL operation MSH-C24TV - : MUH-C24TV - (230V) CAPACITY : 6.3(KW) SHF : 0.67 INPUT : 2850(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 7.40 3.63 0.49 2280 7.09 3.47...
- Page 21 PERFORMANCE DATA COOL operation MSH-C24TV - : MUH-C24TV - (230V) CAPACITY : 6.3(KW) SHF : 0.67 INPUT : 2850(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 6.17 3.03 0.49 2793 5.67 2.78...
- Page 22 PERFORMANCE DATA HEAT operation MSH-C18TV - : MUH-C18TV - (230V) CAPACITY : 6.0(KW) INPUT : 2180(W) OUTDOOR WB(:) INDOOR DB(:) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 3.78 1417 4.56 1700 5.34 1918 6.12 2071 6.90 2202 7.62 2267 8.40 2311 3.60...
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Page 23: Microprocessor Control
MICROPROCESSOR CONTROL MSH-C18TV - MUH-C18TV - WIRELESS REMOTE CONTROLLER MSH-C24TV - MUH-C24TV - Signal transmitting section Once the operation mode are set, the same operation mode can be repeated by simply turning the OPERATE/STOP (ON/OFF) button ON. Operation display section Indoor unit receives the signal with a beep tone. -
Page 24: Continuous
(4) The initial set temperature is decided by the initial room temperature. Model Initial room temperature Initial set temperature 26: or more COOL mode of "I FEEL CONTROL" Initial room temperature 25: to 26: minus 2: Initial room temperature DRY mode of 23: to 25: "I FEEL CONTROL"... -
Page 25: Continuous
Operation chart Example Compressor Outdoor fan (continuously at set speed) Indoor fan 3. Outdoor fan control <MSH-C24TV only> Outdoor fan speed is controlled according to the temperature of ambient temperature Ambient temperature thermistor RT63. thermistor RT63 temperature Outdoor fan Low operation : When the outside temperature decreases to 28°C or less. Outdoor fan speed High Until the outside temperature goes to 31°C or more. - Page 26 9-1-3. HEAT mode of “I FEEL CONTROL” 1. Indoor fan speed control Difference between room (1) In AUTO the fan speed is as follows. temperature and set temperature Initial temperature difference Fan speed during operation Set temperature minus room temperature: 2 degrees or more ·············································· High Set temperature minus room temperature: Between 1 and 2 degrees···································...
- Page 27 The defrost thermistor RT61 reads -2.7°C or less (MSH-C18TV) / -2.0°C or less (MSH-C24TV). c) After releasing the high pressure protection 4 minutes and 15 seconds (MSH-C18TV) / 10 seconds (MSH-C24TV) have elapsed. (2) Releasing conditions of defrost When the condition d) or e) is satisfied, the defrosting operation stops.
- Page 28 5. R.V. coil control Heating · · · · · ON Cooling · · · · · OFF Dry · · · · · · · · OFF NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor. (HEAT) (COOL / DRY) 5 sec.
- Page 29 9-5. FAN MOTOR CONTROL (1) Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feed back the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (High,Med.,Low), the microprocessor controls IC141 and adjusts fan motor electric current to make the current rotational frequency close to the target rotational frequency.
- Page 30 (5) STOP (operation OFF) and ON-TIMER standby. When the following cases occur, the horizontal vane returns to the closed position. (a) When the OPERATE/STOP (ON/OFF) button is pressed (POWER OFF). (b) When the operation is stopped by the emergency operation. (c) When the ON-TIMER is on standby.
- Page 31 9-7. 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.
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Page 32: Continuous
9-8. 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. -
Page 33: Service Functions
MUH-C24TV - 10-1. COMPULSORY DEFROST MODE FOR SERVICE By short circuit of the JP607 and R853(MSH-C18TV)/JPG1 and R871(MSH-C24TV) on the outdoor deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction. (Refer to page 45 or 46.) Defrost thermistor RT61 must read below -2.7°C(MSH-C18TV)/ -2.0°C(MSH-C24TV). - Page 34 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 Same as at left No. 2 unit – Solder J1 Same as at left No.
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Page 35: Troubleshooting
TROUBLESHOOTING MSH-C18TV - MUH-C18TV - MSH-C24TV - MUH-C24TV - 11-1. 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 36 11-2. Instruction of troubleshooting 1<The case of the trouble of the serial signal> When the power is turned off and then turned on again, the indication shows “the trouble of mis- Start wiring.” Indoor unit Indoor unit Indoor unit OPERATION INDICATOR operates.
- Page 37 1. Troubleshooting check table •The following indication does not depend on the shape of lamp. flashing · Flashing of the OPERATION INDICATOR lamp (on the left-hand side) Operation Indicator indicates possible abnormalities. · The OPERATION INDICATOR lamp (on the left-hand side) is lighting during normal operation.
- Page 38 2. Trouble criterion of main parts MSH-C18TV - MUH-C18TV - MSH-C24TV - MUH-C24TV - Part name Check method and criterion Figure Room Measure the resistance with a tester. temperature (Part temperature 10°C ~ 30°C) thermistor(RT11) Normal Abnormal Indoor coil Open or short-circuit 8kΩ...
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Page 39: Check Of Indoor Fan Motor
Check of indoor fan motor Indoor fan motor does not operate. Turn OFF the power supply. Check connector CN211 visually. Are lead wires connected? Is soldered point normal? Re-solver it. Re-connect the lead wires. Disconnect lead wires from connector CN211 on the indoor electronic control P.C. board. Measure resistance between lead wires No.1 and No.4 and then No.1 and No.2. -
Page 40: Check Of Indoor Electronic Control P.c. Board
Replace the varistor. Replace the fan motor. Check of outdoor unit Compressor and / or outdoor fan motor doesn’t operate.(Only indoor fan operates.) MSH-C18TV Start Press the EMERGENCY OPERATION switch. 3-minute time delay works. Test run operation operates for 30 minutes. - Page 41 MSH-C24TV Start Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch. Test run operation operates for 30 minutes. Compressor doesn't operate. Is there 5V DC between Is there 230V AC between J101 - J401 on the deicer Make the connection CN730 1-3 on the deicer P.C.
- Page 42 Check of R.V. coil Unit operates COOL mode even if it is set HEAT mode. w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit. Disconnect the TAB52 on the deicer P.C. board. Turn ON the power supply and operate the indoor unit in HEAT mode by pressing the EMERGENCY OPERATION switch.
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Page 43: How To Check Mis-Wiring And Serial Signal Error
52C contactor turns ON, is there 230V AC between the Rectify in-out connecting wire. outdoor terminal block Is there 5V DC between J8 – (MSH-C18TV) / Check and rectify the fuse and the varistor J401 - J101 (MSH-C24TV) on the deicer P.C. - Page 44 TEST POINT DIAGRAM AND VOLTAGE MSH-C18TV - MSH-C24TV - Fan motor CN211 Fuse(F11)250V AC 3.15A Power supply input 230V AC C144 5V DC C144 Room temperature thermistor(RT11) Indoor coil thermistor(RT12) Timer short mode point Emergency operation switch 12V DC JP41...
- Page 45 MUH-C18TV - Outdoor deicer P.C. board R601 5~10V DC Fan motor (Refer to page 43.) R.V. coil CN711 230V AC 230V AC 230V AC CN661 Defrost thermistor(RT61) (Refer to page 43.) Fuse (F61) 2A/250V Defrost interval time short pin (JP607, R853) (Refer to page 33.) 5V DC (Refer to page...
- Page 46 MUH-C24TV - Outdoor deicer P.C. board Defrost thermistor (RT61) Ambient temperature thermistor (RT63) -20 -10 10 20 30 40 Temperature(:) CN661 1-2 CN662 3-4 Defrost ther- Ambient tempera- mistor (RT61) ture thermistor Fan motor Varistor (Refer to (RT63) CN711 NR62 page 43.) (Refer to page 43.) R.V.
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Page 47: Disassembly Instructions
2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 12-1. MSH-C18TV - MSH-C24TV - INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel Photo 1 (1) Remove the screw caps at the down of the front panel. - Page 48 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Photo 3 (1) Remove the front panel. (Refer to 1) Screw of the (2) Remove the electrical cover. ground wire (3) Disconnect the connector of the indoor coil thermistor. (4) Disconnect the motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic con- trol P.C.
- Page 49 12-2. MUH-C18TV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the cabinet. (2) Hold the down of the cabinet on the both side to remove the cabinet. Photo 2 Screws Service panel Screws 2.
- Page 50 OPERATING PROCEDURE PHOTOS 3. Removing the outdoor fan motor (1) Remove the cabinet. (Refer to 1) Photo 4 (2) Disconnect the connector remove the clamp of fan motor lead wire. Set screws of the (3) Remove the propeller fan nut and remove the propeller fan. Propeller fan Lead clamps outdoor fan motor...
- Page 51 12-3. MUH-C24TV - OUTDOOR UNIT OPERATING PROCEDURE PHOTOS Screws of the top panel Photo 1 1. Removing the cabinet (1) Remove the screws of the top panel and the top panel. 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.
- Page 52 OPERATING PROCEDURE PHOTOS Photo 5 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 Screws fixed by the catches on the right and left sides. Lift it to remove.) Open the rear panel to the rear to remove.
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Page 53: Parts List
PARTS LIST MSH-C18TV - (WH) MSH-C24TV - (WH) 13-2. INDOOR UNIT 13-1. INDOOR UNIT HEAT EXCHANGER STRUCTURAL PARTS Optional parts (See page 58.) 13-1. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. Symbol... - Page 54 MSH-C18TV - (WH) MSH-C24TV - (WH) 13-3. INDOOR UNIT 13-4. ACCESSORY PARTS FUNCTIONAL PARTS AND REMOTE CONTROLLER AND ELECTRICAL PARTS SLEEVE BEARING INDOOR COIL ROOM TEMPERATURE THERMISTOR THERMISTOR 13-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration.
- Page 55 MUH-C18TV - DEFROST THERMISTOR 13-5. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Part No. Part Name Remarks MUH-C18TV- Diagram E02 140 233 BACK PANEL E02 141 232 CABINET E02 141 521...
- Page 56 MUH-C24TV - 13-6. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS...
- Page 57 MUH-C24TV - 13-6. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol Part No. Part Name Remarks in Wiring MUH-C24TV - Diagram E02 214 297 TOP PANEL AMBIENT TEMPERATURE THRMISTOR E02 578 309 RT63...
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Page 58: Accessory Parts
Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. DO NOT reuse AIR CLEANING FILTER even if it is washed. DO NOT remove or attach AIR CLEANING FILTER during unit operation. Part No. Model MSH-C18TV- MAC-1100FT MSH-C24TV- Air cleanig filter (White bellows type) 14-2. DEODORIZING FILTER DEODORIZING FILTER removes ammonia and hydrogen sulphide emitted from tobacco, and odor of pets. - Page 60 HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD New publication, effective Feb. 2001 Distributed in Feb. 2001. No.OB279 PDF 248 Specifications subject to change without notice. Made in Japan...