Table of Contents
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
Wireless type
Models
MSH-18RV -
MSH-24RV -
MSH-30RV -
MSH-18RV -
E1
MSH-24RV -
E1
•Refer to the Service Manual OB185 REVISED EDITION C when MSH-18RV-
with MXZ-32NV-
or MXZ-32NV-
E1
•Refer to the Service Manual OB227 REVISED EDITION-B when MSH-18RV-
with MXZ-32RV-
as multi system units.
E1
•Refer to the Service Manual OB254 when MSH-18RV-
multi system units.
· MUH-18RV -
( WH )
E1
· MUH-18RV -
· MUH-24RV -
( WH )
E1
· MUH-30RV -
( WH )
E1
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················2
3. SPECIFICATION·················································6
4. NOISE CRITERIA CURVES ·······························8
5. OUTLINES AND DIMENSIONS ······················ 10
6. WIRING DIAGRAM ··········································13
7. REFRIGERANT SYSTEM DIAGRAM ··············17
8. PERFORMANCE CURVES ······························20
9. MICROPROCESSOR CONTROL ····················36
10. SERVICE FUNCTIONS·····································50
11. TROUBLESHOOTING ······································52
12. DISASSEMBLY INSTRUCTIONS·····················71
13. PARTS LIST······················································79
14. OPTIONAL PARTS···········································88
as multi system units.
E2
is connected with MXZ-32SV-
E1
Revision:
MUH-18RV-
has been added.
E2
MUH-18RV-
MUH-18RV-
E1
•Path of outdoor heat exchanger has changed.
is connected
E1
is connected
E1
E2
No. OB272
REVISED EDITION-A
E1
E2
E1
E1
as
E1
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Table of Contents
Related Manuals for Mitsubishi MSH-18RV
Summary of Contents for Mitsubishi MSH-18RV
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Page 1: Table Of Contents
10. SERVICE FUNCTIONS·····································50 11. TROUBLESHOOTING ······································52 12. DISASSEMBLY INSTRUCTIONS·····················71 13. PARTS LIST······················································79 14. OPTIONAL PARTS···········································88 •Refer to the Service Manual OB185 REVISED EDITION C when MSH-18RV- is connected with MXZ-32NV- or MXZ-32NV- as multi system units. •Refer to the Service Manual OB227 REVISED EDITION-B when MSH-18RV-... -
Page 2: Technical Changes
TECHNICAL CHANGES MSH-18NV - MSH-18RV - MSH-24NV - MSH-24RV - 1. Remote controller has changed. • SLEEP MODE function has removed. • ECONO COOL operation has added. • SWING button is removed, but SWING MODE function is available by VANE CONTROL button. -
Page 3: Outdoor Unit
Air inlet Piping Drainage hose Air outlet Drain outlet ACCESSORIES Indoor unit MSH-18RV- MSH-30RV- MSH-24RV- Installation plate Installation plate fixing screw 4 o 25 mm Remote controller mouting hardware Fixing screw for 3 o 3.5 o 1.6 mm (Black) Battery (AAA) for remote controller... -
Page 4: Remote Controller
REMOTE CONTROLLER MSH-18RV - MSH-24RV - 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 5 REMOTE CONTROLLER MSH-30RV - 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 VANE button FAN SPEED CONTROL button STOP (Horizontal vane button) I FEEL COOL OFF-TIMER button VANE START...
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Page 6: Specification
SPECIFICATION W1. Refer to the Service Manual OB185 REVISED EDITION C when MSH-18RV- is connected with MXZ-32NV- or MXZ-32NV- as multi system units. Refer to the Service Manual OB227 REVISED EDITION-B when MSH-18RV- is connected with MXZ-32RV- as multi system units. - Page 7 Indoor model MSH-30RV - Cooling Heating Function Single phase Power supply 220-240V, 50Hz Capacity — Dehumidification K /h 960/822 /684 960/834 /732 Air flow(High/Med. /Low ) Power outlet 15.3-15.5 16.3-15.8 Running current Power input 3,300-3,460 3,520-3,560 Auxiliary heater A(kW) — Power factor 98-93 98-94...
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Page 8: Noise Criteria Curves
NOISE CRITERIA CURVES MSH-18RV- MSH-24RV- 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 MSH-30RV- NOTCH SPL(dB(A)) LINE High Test conditions, Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5: NC-70 NC-60 NC-50 NC-40 NC-30 APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz MUH-30RV- NOTCH...
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Page 10: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: mm MSH-18RV - MSH-24RV - 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 11: Indoor Unit
MSH-30RV - Unit: mm INDOOR UNIT Installation plate Indoor unit 1068 414.5 414.5 Wall hole [ 75 1100 Installation plate Liquid line [ 9.52- 0.5m Gas line [ 19-0.43m Insulation [ 50 O.D Air in [ 32 I.D Drain hose [ 16 Air out (Connected part O.D) Insulation [ 28... - Page 12 MUH-24RV- Unit: mm MUH-30RV- OUTDOOR UNIT Outdoor Unit-Necessary surrounding clearance Air intake Note:Allow adequate upper clearance Air intake Front opening Air outlet Terminal block for power line(MUH-30RV only) Terminal block for indoor and outdoor unit connection Service space Outlet guide installation hole Handle for moving Service panel...
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Page 13: Wiring Diagram
WIRING DIAGRAM MSH-18RV - MODEL WIRING DIAGRAM INDOOR UNIT TO OUTDOOR UNIT CONNECTING RT12 HIC1 IC141 CN201 200-240V~ TRANS CN211 POWER SUPPLY CORD ~/N 220-240V RT11 ELECTRONIC CONTROL P.C. BOARD 50Hz CIRCUIT BREAKER GRN/YLW DISPLAY RECEIVER FOR MULTI SYSTEM P.C. BOARD P.C. - Page 14 MUH-18RV - MODEL WIRING DIAGRAM OUTDOOR UNIT 21S4 RT61 CN730 CN661 CN721 CN720 SR61 TAB21 220-240V~ TRANS CN711 TAB20 DEICER P.C. BOARD SYMBOL NAME SYMBOL NAME SYMBOL NAME COMPRESSOR CAPACITOR COMPRESOR (INNER PROTECTOR) TERMINAL BLOCK OUTDOOR FAN CAPACITOR OUTDOOR FAN MOTOR (INNER PROTECTOR) R.V.
- Page 15 MSH-24RV - MODEL WIRING DIAGRAM INDOOR UNIT TO OUTDOOR UNIT CONNECTING RT12 HIC1 IC141 RT11 CN201 220-240V~ TRANS CN211 POWER SUPPLY CORD ELECTRONIC CONTROL P.C. BOARD ~/N 220-240V 50Hz CIRCUIT BREAKER DISPLAY RECEIVER GRN/YLW P.C. BOARD P.C. BOARD REMOTE CONTROLLER NAME NAME NAME...
- Page 16 MSH-30RV - MODEL WIRING DIAGRAM INDOOR UNIT RT13 TO OUTDOOR UNIT HIC1 RT12 CONNECTING CN112 CN201 NR11 TRANS SR141 220-240V ~ TAB12 CN211 RT11 ELECTRONIC CONTROL P.C. BOARD DISPLAY RECEIVER P.C.BOARD P.C.BOARD REMOTE CONTROLLER SYMBOL NAME SYMBOL SYMBOL NAME NAME INDOOR FAN CAPACITOR VANE MOTOR(VERTICAL) SR141...
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Page 17: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit:mm MSH-18RV - MUH-18RV - MUH-18RV - OUTDOOR UNIT INDOOR UNIT 4- way valve Refrigerant pipe [15.88 (with heat insulator) Muffler Indoor coil Indoor thermistor Strainer Stop valve RT12 heat Outdoor exchanger (with service port) Distributor heat... - Page 18 MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Piping size O.D : mm Length of connecting pipe : m Max. length : m Model Outdoor unit Indoor unit Liquid MSH-18RV - MUH-18RV - 6.35 MUH-18RV - Gas 0 Gas 0.43 15.88 Liquid 0.5 Liquid 0...
- Page 19 ADDITIONAL REFRIGERANT CHARGE(R22 : g) Refrigerant piping length (one way) Model Outdoor unit precharged MSH-18RV - MUH-18RV - 1,650 MUH-18RV - Calculation : Xg=50g/m (Refrigerant piping length (m)–7) Refrigerant piping length (one way) Model Outdoor unit precharged MSH-24RV - 2,400...
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Page 20: Performance Curves
PERFORMANCE CURVES MSH-18RV - MUH-18RV - MUH-18RV - MSH-24RV - MUH-24RV - MSH-30RV - MUH-30RV - 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 21 28.0 29.8 39.2 25.9 27.5 36.2 23.7 25.2 33.2 21.6 22.9 30.2 19.4 20.6 27.2 17.2 18.3 24.1 15.1 16.1 21.1 12.9 13.8 18.1 NOTE:The above curves are for the heating operation without any frost. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation 1 1 Both indoor and outdoor unit are under the same temperature/humidity condition.
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Page 22: Heat Operation
MUH-30RV - MUH-30RV - (kgf/F[Gauge])(MPa[Gauge]) 240V 220V 220-240V 18 20 30 32 35(:) 18 20 30 32 35(:) Ambient temperature(˚C) Ambient temperature(˚C) Ambient humidity(%) Ambient humidity(%) HEAT operation Condition indoor:Dry bulb temperature 20.0°C Wet bulb temperature 14.5°C Outdoor:Dry bulb temperature 7,15,20°C Wet bulb temperature 6,12,14.5°C MUH-18RV - MUH-24RV -... - Page 23 PERFORMANCE DATA COOL operation MSH-18RV - : MUH-18RV - MUH-18RV - (220V) CAPACITY : 5.1(KW) SHF : 0.66 INPUT : 2030(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 5.99 2.88...
- Page 24 PERFORMANCE DATA COOL operation MSH-18RV - : MUH-18RV - MUH-18RV - (220V) CAPACITY : 5.1(KW) SHF : 0.66 INPUT : 2030(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 4.23 2.03...
- Page 25 PERFORMANCE DATA COOL operation MSH-18RV - : MUH-18RV - MUH-18RV - (240V) CAPACITY : 5.1(KW) SHF : 0.66 INPUT : 2120(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 5.99 2.88...
- Page 26 PERFORMANCE DATA COOL operation MSH-18RV - : MUH-18RV - MUH-18RV - (240V) CAPACITY : 5.1(KW) SHF : 0.66 INPUT : 2120(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 5.00 2.40...
- Page 27 PERFORMANCE DATA COOL operation MSH-24RV - : MUH-24RV - (220V) CAPACITY : 6.0(KW) SHF : 0.65 INPUT : 2720(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 7.05 3.31 0.47 2176 6.75 3.17...
- Page 28 PERFORMANCE DATA COOL operation MSH-24RV - : MUH-24RV - (220V) CAPACITY : 6.0(KW) SHF : 0.65 INPUT : 2720(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 5.88 2.76 0.47 2666 5.40 2.54...
- Page 29 PERFORMANCE DATA COOL operation MSH-24RV - : MUH-24RV - (240V) CAPACITY : 6.0(KW) SHF : 0.65 INPUT : 2750(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 7.05 3.31 0.47 2200 6.75 3.17...
- Page 30 PERFORMANCE DATA COOL operation MSH-24RV - : MUH-24RV - (240V) CAPACITY : 6.0(KW) SHF : 0.65 INPUT : 2750(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 0.47 2860 5.19 2.44 0.47 2915...
- Page 31 PERFORMANCE DATA COOL operation MSH-30RV - : MUH-30RV - (220V) CAPACITY : 8.3(KW) SHF : 0.62 INPUT : 3300(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 9.75 4.29 0.44 2640 9.34 4.11 0.44 2772...
- Page 32 PERFORMANCE DATA COOL operation MSH-30RV - : MUH-30RV - (220V) CAPACITY : 8.3(KW) SHF : 0.62 INPUT : 3300(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 8.13 3.58 0.44 3234 7.47 3.29 0.44 3432...
- Page 33 PERFORMANCE DATA COOL operation MSH-30RV - : MUH-30RV - (240V) CAPACITY : 8.3(KW) SHF : 0.62 INPUT : 3460(W) OUTDOOR DB(:) INDOOR INDOOR SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT DB(:) WB(:) 9.75 4.29 0.44 2768 9.34 4.11 0.44 2906...
- Page 34 PERFORMANCE DATA COOL operation MSH-30RV - : MUH-30RV - (240V) CAPACITY : 8.3(KW) SHF : 0.62 INPUT : 3460(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT SHC SHF INPUT 8.13 3.58 0.44 3391 7.47 3.29 0.44 3598...
- Page 35 PERFORMANCE DATA HEAT operation MSH-18RV - : MUH-18RV - MUH-18RV - (220V) CAPACITY : 5.4(KW) INPUT : 1980(W) OUTDOOR WB(:) INDOOR DB(:) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 3.40 1287 4.10 1544 4.81 1742 5.51 1881 6.21 2000 6.86 2059 7.56...
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Page 36: Microprocessor Control
MICROPROCESSOR CONTROL MSH-18RV - MUH-18RV - MUH-18RV - MSH-24RV - MUH-24RV - MSH-30RV - MUH-30RV - WIRELESS REMOTE CONTROLLER MSH-18RV - MSH-24RV - MSH-30RV - Signal transmitting section Signal transmitting section Operation display section Operation display section OPERATE /STOP (ON /OFF)button... - Page 37 • Once the mode is fixed, the mode does not change by room temperature afterwards. • Under the ON-TIMER ( ) operation, mode is determined according to the room temperature at the set time the operation starts. • When the system is stopped on the remote controller, and restarted within 2 hours in “I FEEL CONTROL” ( ) mode, the system operates in previous mode automatically regardless of the room temperature.
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Page 38: High
9-1-1. COOL mode of “I FEEL CONTROL” 1. Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button. Difference between room In AUTO the fan speed is as follows. temperature and set temperature during operation Initial temperature difference Fan Speed Room temperature minus set temperature : 3 degrees or more·····························High... - Page 39 1. Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button. However, in AUTO fan operation, fan speed becomes Low. 2. The operation of the compressor and indoor/ outdoor fan Compressor operates by room temperature control and time control. Set temperature is controlled to fall 2°C from initial room temperature.
- Page 40 <MSH-18/24RV> During heating operation, the outdoor fan motor is controlled by the temperature of indoor coil thermistor RT12 for excess rise protection of compressor discharge pressure. (MSH-18RV) Outdoor fan OFF : 60°C Outdoor fan ON : 56°C Outdoor fan (MSH-24RV) Outdoor fan OFF : 52°C High pressure protection Outdoor fan ON : 48°C...
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Page 41: High
NOTE1 • When the indoor coil thermistor RT12 reads above 18°C, indoor fan operates at Very Low for 30 seconds. • When the indoor coil thermistor RT12 reads 18°C or less, the indoor fan stops. NOTE2 •Refer to the Service Manual OB185 REVISED EDITION C when MSH-18RV- is connected with... - Page 42 Dry · · · · · · · · OFF NOTE1 The 4-way valve reverses for 5 seconds right before start-up of the compressor. NOTE2 •Refer to the Service Manual OB185 REVISED EDITION C when MSH-18RV- is connected with MXZ-32NV- or MXZ-32NV- as multi system units.
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Page 43: High
9-5. INDOOR 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(MSH-18/24RV)/ SR141(MSH-30RV) and adjusts fan motor electric current to make the current rotational frequency close to the target rotational frequency. - Page 44 (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 45 (10) LONG MODE ( ) <MSH-30RV> By pressing the LONG button fan speed becomes faster than setting fan speed on the remote controller, and the hori- zontal vane moves to the position for LONG mode. The remote controller displays “ ”.
- Page 46 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 47: Continuous
Emergency operation continues until the EMERGENCY OPERATION switch is pressed once or twice or the unit receives any signal from the remote controller. In case of latter normal operation will start. NOTE : Do not press the EMERGENCY OPERATION switch during normal operation. MSH-18RV - MSH-24RV - • The following indication does not depend on the shape of lamp. -
Page 48: High
9-9. LEV control <MSH-30RV> LEV (Expansion valve) is controlled by “Thermostat ON” commands given from the unit. Controlled range Minimum : 54 pulse, Maximum : 500 pulse Drive speed 30 ~ 90 pulse / second Opening set The setting is always in opening direction. (When closing LEV, open the LEV to adjust to set opening after closing the LEV at once.) Opening in stop : 150 pulse... - Page 49 2 When the temperature difference RT between indoor coil thermistor (main) RT12 and indoor coil thermistor (sub) RT13 in the indoor unit is 2: or more for a fixed time at cool or dry operation, the target discharge temperature is changed.
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Page 50: Service Functions
10-1. COMPULSORY DEFROSTING MODE FOR SERVICE By short circuit of the connector JP607 and R853(MSH-18RV)/ JPG1 and R871(MSH-24/30RV) on the outdoor deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction. (Refer to page 69 or 70.) Defrost thermistor RT61 must read below -3°C. - Page 51 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 52: Troubleshooting
TROUBLESHOOTING MSH-18RV - MUH-18RV - MUH-18RV - MSH-24RV - MUH-24RV - MSH-30RV - MUH-30RV - 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 53 11-2. Instruction of troubleshooting MSH-18RV Start Indoor unit Indoor unit Indoor unit operates. OPERATION INDICATOR operates. doesn't receive Outdoor unit lamp on the indoor unit is Outdoor unit the signal from doesn't operate flashing on and off. doesn't remote controller.
- Page 54 MSH-24/30RV Start Indoor unit Indoor unit Indoor unit operates. OPERATION INDICATOR operates. doesn't receive Outdoor unit lamp on the indoor unit is Outdoor unit the signal from doesn't operate flashing on and off. doesn't remote controller. normally. operate. Outdoor unit Unit doesn't Indoor unit Outdoor unit...
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Page 55: Normal Operation
1. Troubleshooting check table MSH-18RV • 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 56 MSH-24/30RV • The following indication does not depend on the shape of lamp. flashing · Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible Operation Indicator abnormalities. · The OPERATION INDICATOR lamp (on the left-hand side) is lighting during normal operation. Before taking measures, make sure that the symptom reappears, for accurate troubleshooting.
- Page 57 2. Trouble criterion of main parts MSH-18RV - MUH-18RV - MUH-18RV - MSH-24RV - MUH-24RV - 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...
- Page 58 MSH-30RV - MUH-30RV - Part name Check method and criterion Figure Room temperature Measure the resistance with a tester. thermistor(RT11) (Part temperature 10˚C ~ 30˚C) Normal Abnormal Indoor coil thermistor Open or short-circuit (RT12(main), RT13(sub)) 8 k" ~ 20 k" Measure the resistance with a tester.
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Page 59: A Check Of Indoor Fan Motor
When OPERATION INDICATOR lamp flashes 3-time. Indoor fan motor doesn’t operate. Check of indoor fan motor Turn OFF the power supply. Check connector CN211 visually. Are lead wires connected? Is soldered point normal? Re-solder 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(MSH-18/24RV). -
Page 60: Check Of Indoor Electronic Control P.c. Board
Replace the varistor. Replace the fan motor. Compressor and/ or outdoor fan motor doesn’t operate. Check of outdoor unit MSH-18RV Start Press the EMERGENCY OPERATION switch. 3-minute time delay works. Test run operation operates for 30 minutes. Check the voltage to the terminal block of outdoor Check the outdoor DEICER P.C.board at first, then check... - Page 61 MSH-24RV 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 220-240V AC Is there 5V DC between Make the connection between CN730 1-3 on J101 - J401...
- Page 62 MSH-30RV Turn ON the power supply. Is there 220-240V AC Check the outdoor power supply to between on the and connection of wiring. outdoor terminal block Compressor does not operate. Is there 5V DC between Is there 220-240V AC Make the connection between CN730 1-3 on J101 - J401...
- Page 63 Compressor and / or outdoor fan motor doesn’t stop. <MSH-24/30RV> 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.
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Page 64: How To Check Mis-Wiring And Serial Signal Error
52C contactor turns ON, is there 220-240V AC between Rectify in-out connecting wire. the outdoor terminal block Is there 5V DC between J8 – (MSH-18RV)/ Check and rectify the fuse and the varistor J101 -J401 (MSH-24RV) on the deicer P.C. - Page 65 When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. How to check mis-wiring <MSH-30RV> w Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self -check to be displayed in 3 seconds. Start •...
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Page 66: Check Of Lev (Expansion Valve)
When OPERATION INDICATOR lamp flashes 10-time. Heating/ Cooling doesn't operate. Check of LEV (Expansion valve) <MSH-30RV> 1 During pressing OPERATION SELECT button on remote controller, press RESET button. 2 First, release RESET button. 1 During pressing OPERATION SELECT (Confirm all displays of remote controller.) button on remote controller, press 3 Then release OPERATION SELECT button. - Page 67 TEST POINT DIAGRAM AND VOLTAGE MSH-18RV - MSH-24RV - Indoor electronic control P.C. board Fan motor power supply Fuse(F11) 250V AC 3.15A Power supply input 220-240V AC C144 5V DC C144 Room temperature thermistor(RT11) Indoor coil thermistor(RT12) Timer short mode point (JPS, JPG) (Refer to page 50.)
- Page 68 TEST POINT DIAGRAM AND VOLTAGE MSH-30RV - Indoor electronic control P.C. board Fan motor power supply Power supply input 220-240V AC 5V DC Fuse (F11) 250V AC 3.15A Room temperature thermistor(RT11) Indoor coil PS132 thermistor(RT12(main)) Indoor coil thermistor(RT13(sub)) Emergency operation switch Timer short mode point (JPS, JPG)
- Page 69 MUH-18RV - MUH-18RV - Outdoor deicer P.C. board R601 5~10V DC(Refer to page 64.) R.V. coil Outdoor fan motor 220-240V AC 220-240V AC 220-240V AC CN661 1-2 Defrost thermistor (RT61) (Refer to page 66.) Fuse 2A/250V Defrost interval time short pin (JP607,R853) (Refer to page 50.) 5V DC...
- Page 70 MUH-24RV - MUH-30RV - Outdoor deicer P.C. board Defrost thermistor (RT61) Ambient temperature thermistor (RT63) Discharge temperature thermistor(RT62) -20 -10 10 20 30 40 0 10 20 30 40 50 60 70 80 90 100 110 120 Temperature(:) Temperature(:) CN661 1-2 <MSH-30RV only>...
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Page 71: Disassembly Instructions
2Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 12-1. MSH-18RV - MSH-24RV - 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 72 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Photo 3 (1) Remove the front panel. (Refer to 1) (2) Remove the electrical cover. (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 73 12-2. MSH-30RV - INDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the front panel Photo 1 (1) Remove the screws caps of the front panel. Front panel Remove the screws. (2) Pull the panel down to your side slightly and unhook the catches at the top.
- Page 74 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box Photo 3 Screws of the ground wire (1) Remove the front panel. (Refer to 1) (2) Remove the electrical cover. (Refer to 2) (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 control P.C.
- Page 75 12-3. MUH-18RV - MUH-18RV - 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...
- Page 76 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 Set screws of the lead wire. outdoor fan motor Lead clamps propeller fan (3) Remove the propeller fan nut and remove the propeller fan.
- Page 77 12-4. MUH-24RV - MUH-30RV - NOTE: These photos use MUH-30RV - OUTDOOR UNIT MUH-24RV - is almost the same as MUH-30RV - 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.
- Page 78 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 79: Parts List
PARTS LIST MSH-18RV - (WH) MSH-24RV - (WH) 13-2. INDOOR UNIT 13-1. INDOOR UNIT HEAT EXCHANGER STRUCTURAL PARTS Optional parts (See back cover.) 13-1. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. Symbol... - Page 80 MSH-18RV - (WH) MSH-24RV - (WH) 13-3. INDOOR UNIT 13-4. ACCESSORY AND FUNCTIONAL PARTS 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 81 MUH-18RV - MUH-18RV - 13-5. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS DEFROST THERMISTOR Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring Part No. Part Name Remarks MUH-18RV- MUH-18RV- Diagram E02 140 233 BACK PANEL E02 141 232 CABINET...
- Page 82 MUH-24RV - 13-6. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 15 16...
- Page 83 MUH-24RV - 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-24RV - Diagram E02 214 297 TOP PANEL E02 578 309 AMBIENT TEMPERATURE THRMISTOR RT63...
- Page 84 MSH-30RV - (WH) 13-7. INDOOR UNIT STRUCTURAL PARTS 13-8. INDOOR UNIT HEAT EXCHANGER CATCH Optional parts SCREW (See back cover.) 13-7. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. Q'ty/unit Symbol in Wiring Part No.
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Page 85: Electrical Parts
MSH-30RV - (WH) 13-10. ACCESSORY AND 13-9. INDOOR UNIT FUNCTIONAL PARTS AND REMOTE CONTROLLER ELECTRICAL PARTS SLEEVE BEARING ROOM TEMPERATURE THERMISTOR VARISTOR 15 16 FUSE 13-9. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol in Wiring... - Page 86 MUH-30RV - 13-11. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS...
- Page 87 MUH-30RV - 13-11. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. Q'ty/unit Symbol Remarks Part No. Part Name in Wiring MUH-30RV - Diagram E02 214 297 TOP PANEL E02 528 309 THERMISTOR RT62, RT63...
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Page 88: Optional Parts
Deodorizing filter (Gray sponge type) DEODORIZING FILTER and AIR CLEANING FILTER can be attached on either side. HEAD OFFICE: MITSUBISHI DENKI BLDG.,2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN C C Copyright 2001 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jan. 2002. No.OB272 REVISED EDITION-A 272 New publication, effective Jan.