Table of Contents
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SPLIT-TYPE AIR CONDITIONERS
SERVICE MANUAL
Models
MUZ-FH25VE
MUZ-FH35VE
MUZ-FH25VE
MUZ-FH35VE
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
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E1
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E1
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E1
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 7
5. OUTLINES AND DIMENSIONS ························ 8
6. WIRING DIAGRAM ············································ 9
7. REFRIGERANT SYSTEM DIAGRAM ··············11
8. PERFORMANCE CURVES ····························· 13
9. ACTUATOR CONTROL ··································· 24
10. SERVICE FUNCTIONS ···································· 25
11. TROUBLESHOOTING ····································· 26
12. DISASSEMBLY INSTRUCTIONS ···················· 47
PARTS CATALOG (OBB624)
• MUZ-FH50VE-
has been added.
E1
Please void OBH624.
No. OBH624
HFC
REVISED EDITION-A
utilized
R410A
Indoor unit service manual
MSZ-FH•VE Series (OBH623)
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Table of Contents
Related Manuals for Mitsubishi Electric MUZ-FH25VE - E1
Summary of Contents for Mitsubishi Electric MUZ-FH25VE - E1
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Page 1: Table Of Contents
Revision A: • MUZ-FH50VE- has been added. Please void OBH624. SPLIT-TYPE AIR CONDITIONERS OUTDOOR UNIT No. OBH624 SERVICE MANUAL REVISED EDITION-A utilized R410A Models MUZ-FH25VE MUZ-FH35VE MUZ-FH50VE Indoor unit service manual MSZ-FH•VE Series (OBH623) CONTENTS 1. TECHNICAL CHANGES ··································· 3 2. -
Page 2: Revision A
Use the specifi ed refrigerant only Never use any refrigerant other than that specified. Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of. Correct refrigerant is specified in the manuals and on the spec labels provided with our products. We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions. -
Page 3: Technical Changes
TECHNICAL CHANGES MUZ-FH25VE - MUZ-FH35VE - MUZ-FH50VE - 1. New model PART NAMES AND FUNCTIONS MUZ-FH25VE MUZ-FH35VE Air inlet (back and side) Piping Drain hose Air outlet Drain outlet MUZ-FH50VE Air inlet (back and side) Piping Drain hose Air outlet Drain outlet ACCESSORIES MUZ-FH25VE... -
Page 4: Specification
SPECIFICATION Outdoor model MUZ-FH25VE MUZ-FH35VE Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (1.4 - 3.5) 3.5 (0.8 - 4.0) Capacity Rated frequency (Min.-Max.) Heating 3.2 (1.8 - 5.5) 4.0 (1.0 - 6.3) Breaker Capacity Cooling Power input 1 (Total) Heating Cooling Running current 1... - Page 5 Outdoor model MUZ-FH50VE Power supply Single phase, 230 V, 50 Hz Cooling 5.0 (1.9 - 6.0) Capacity Rated frequency (Min. - Max.) Heating 6.0 (1.7 - 8.7) Breaker Capacity Cooling 1,380 Power input 1 (Total) Heating 1,480 Cooling Running current 1 (Total) Heating Cooling...
- Page 6 Specifi cations and rated conditions of main electric parts Model MUZ-FH25VE MUZ-FH35VE Item Smoothing (C61, C62) 600 μF/ 620 μF 420 V capacitor Diode module (DB61) 15 A 600 V (F61) T20AL250V Fuse (F701, F801, F901) T3.15AL250V (IC700) 15 A 600 V Power module (IC932) 8A600V...
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Page 7: Noise Criteria Curves
NOISE CRITERIA CURVES MUZ-FH25VE MUZ-FH35VE FUNCTION SPL(dB(A)) FUNCTION SPL(dB(A)) LINE LINE COOLING COOLING HEATING HEATING NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 NC-10 NC-10 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz BAND CENTER FREQUENCIES, Hz MUZ-FH50VE Test conditions... -
Page 8: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: mm MUZ-FH25VE REQUIRED SPACE MUZ-FH35VE 100 mm or more Drain hole ø42 Air in Air in 2 holes 10 X 21 Service panel Air out 22.3 Liquid refrigerant pipe joint Handle Refrigerant pipe (flared) ø6.35 Gas refrigerant pipe joint Refrigerant pipe (flared) ø9.52 170.5 302.5... -
Page 9: Wiring Diagram
WIRING DIAGRAM MUZ-FH25VE MUZ-FH35VE OBH624A... - Page 10 MUZ-FH50VE OBH624A...
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Page 11: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-FH25VE Unit: mm MUZ-FH35VE Refrigerant pipe ø9.52 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature thermistor Outdoor Muffler RT68 Discharge heat Flared connection exchanger temperature thermistor RT62 Ambient Compressor temperature thermistor RT65 Defrost thermistor RT61 Capillary tube... - Page 12 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: m Piping size O.D: mm Model Max. Length A Max. Height difference B Liquid 9.52 6.35 MUZ-FH25/35 12.7 6.35 MUZ-FH50 Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: g) Refrigerant piping length (one way) Outdoor unit Model...
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Page 13: Performance Curves
PERFORMANCE CURVES MUZ-FH25VE MUZ-FH35VE MUZ-FH50VE The standard specifications apply only to the operation of the air conditioner under normal conditions. Since operating condi- tions 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. - Page 14 Total input (Cooling : at Rated frequency 11.4 10.3 Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 15.9 19.8 26.9 14.6 18.3 24.8 13.4 16.8 22.7 12.2 15.2 20.7 11.0 13.7 18.6 12.2 16.5...
- Page 15 8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-FH25VE Correction of Heating capacity Correction of Heating input Correction of Cooling capacity Correction of Cooling input The operational frequency The operational frequency The operational frequency The operational frequency of compressor (Hz) of compressor (Hz) of compressor (Hz) of compressor (Hz)
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Page 16: Cool Operation
8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Dry-bulb temperature (°C) Relative humidity (%) Both indoor and outdoor unit are under the same temperature/ humidity condition. Operation: TEST RUN OPERATION (Refer to 8-3.) Outdoor low pressure MUZ-FH50VE MUZ-FH25VE MUZ-FH35VE (kgf/cm [Gauge])(MPa [Gauge]) - Page 17 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FH25VE CAPACITY: 2.5 kW SHF: 0.95 INPUT: 485 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 2.94 2.26 0.77 2.81 2.17 0.77 2.70 2.08 0.77 2.60 2.00 0.77 3.06...
- Page 18 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FH25VE CAPACITY: 2.5 kW SHF: 0.95 INPUT: 485 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 2.45 1.89 0.77 2.25 1.73 0.77 2.08 1.60 0.77 2.58 1.67 0.65 2.40 1.56...
- Page 19 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FH35VE CAPACITY: 3.5 kW SHF: 0.84 INPUT: 820 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.11 2.71 0.66 3.94 2.60 0.66 3.78 2.49 0.66 3.64 2.40 0.66 4.29...
- Page 20 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FH35VE CAPACITY: 3.5 kW SHF: 0.84 INPUT: 820 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.43 2.26 0.66 3.15 2.08 0.66 2.91 1.92 0.66 3.61 1.95 0.54 3.36 1.81...
- Page 21 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FH50VE CAPACITY: 5.0 kW SHF: 0.73 INPUT: 1380 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.23 0.55 1104 5.63 3.09 0.55 1159 5.40 2.97 0.55 1214 5.20...
- Page 22 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FH50VE CAPACITY: 5.0 kW SHF: 0.73 INPUT: 1380 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.70 0.55 1352 4.50 2.48 0.55 1435 4.15 2.28 0.55 1490 5.15 2.21...
- Page 23 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-FH25VE CAPACITY: 3.2 kW INPUT: 580 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 2.02 2.43 2.85 3.26 3.68 4.06 4.48 1.92 2.30 2.72 3.10 3.52 3.90 4.30 1.73 2.14...
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Page 24: Actuator Control
ACTUATOR CONTROL MUZ-FH25VE MUZ-FH35VE MUZ-FH50VE 9-1. OUTDOOR FAN MOTOR CONTROL The fan motor turns ON/OFF, interlocking with the compressor. [ON] The fan motor turns ON 5 seconds before the compressor starts up. [OFF] The fan motor turns OFF 15 seconds after the compressor has stopped running. 5 seconds 15 seconds Compressor... -
Page 25: Service Functions
SERVICE FUNCTIONS MUZ-FH25VE MUZ-FH35VE MUZ-FH50VE 10-1. CHANGE IN DEFROST SETTING Changing defrost finish temperature <JS> To change the defrost finish temperature, cut/solder the JS wire of the outdoor inverter P.C. board. (Refer to 11-6-1.) Defrost fi nish temperature (°C) Jumper wire MUZ-FH25/35VE MUZ-FH50VE Soldered (Initial setting) -
Page 26: Troubleshooting
TROUBLESHOOTING MUZ-FH25VE MUZ-FH35VE MUZ-FH50VE 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 miswiring. 2. Take care of the following during servicing 1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug. -
Page 27: Outdoor Unit
11-2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (11-3.) disappears, the memorized failure details can be recalled. 1. -
Page 28: Outdoor Unit
2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Confi rm if outdoor unit is abnormal according to the following procedures. Confi rm that the remote controller is in the failure mode recall function. 1. -
Page 29: Outdoor Unit
3. Outdoor unit failure mode table Indoor/outdoor Outdoor unit POWER lamp Abnormal point LED indication unit failure Condition Remedy failure mode (Indoor unit) (Failure mode/protection) (Outdoor P.C. board) mode recall recall function function None (Normal) — — — — — 1-time fl... -
Page 30: Outdoor Unit
11-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time fl ash every Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of compres- does not op- 2.5 seconds within 1 minute after the compressor gets started. sor. -
Page 31: Outdoor Unit
Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 7-time fl ash Low discharge tem- Temperature of discharge temperature thermistor has been • Refer to 11-5. "Check of LEV". operates. 2.5 seconds OFF perature protection 50°C or less for 20 minutes. •... - Page 32 11-4. TROUBLE CRITERION OF MAIN PARTS MUZ-FH25VE MUZ-FH35VE MUZ-FH50VE Part name Check method and criterion Figure Defrost thermistor (RT61) Fin temperature thermistor (RT64) Measure the resistance with a tester. Ambient temperature Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C. thermistor (RT65) board”, for the chart of thermistor.
- Page 33 11-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700) (MUZ-FH25/35)/IGBT module (IC700) (MUZ-FH50). Check the voltage between terminals. See 11-5. “Check of open phase”. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor.
- Page 34 D Check of compressor winding ● Disconnect the connector between the compressor and the power module (IC700) (MUZ-FH25/35)/IGBT module (IC700) (MUZ-FH50), and measure the resistance between the compressor terminals. <<Measurement point>> at 3 points BLK-WHT Measure the resistance between the lead wires at 3 points. BLK-RED WHT-RED <<Judgement>>...
- Page 35 G Check of outdoor thermistors Disconnect the connector of thermistor in the outdoor P.C. board (see below table), and measure the resistance of thermistor. Replace the thermistor except RT64. Is the resistance of thermistor normal? When RT64 is abnormal, replace the inverter P.C. (Refer to 11-6.1.) board.
- Page 36 H Check of R.V. coil MUZ-FH25/35 First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 11-4. In case CN721 is disconnected or R.V. coil is open, voltage is generated between the terminal pins of the connector although no signal is being transmitted to R.V.
- Page 37 I Check of outdoor fan motor Disconnect the connectors CN931 and CN932 from the inverter P.C. board. Check the connection between the connector CN931 and CN932. Is the resistance between each ter- minal of outdoor fan motor normal? (Refer to 11-4.) Disconnect CN932 from the inverter P.C.
- Page 38 J Check of power supply Disconnect the connector between the compressor and the power module (IC700) (MUZ-FH25/35)/IGBT module (IC700) (MUZ-FH50). Rectify indoor/outdoor Turn ON power supply and press connecting wire. EMERGENCY OPERATION switch. Is there voltage 230 VAC Replace the indoor Does POWER lamp on the indoor between the indoor terminal electronic control P.C.
- Page 39 K Check of LEV (Expansion valve) Turn ON the power supply. <Preparation of the remote controller> While pressing both OPERATION SELECT button and TEMP button on the remote controller at the same time, press RESET button. First, release RESET button. Hold down the other two buttons for another 3 sec- onds.
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Page 40: Outdoor Unit
L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 11-5. .) Is the fuse (F901) blown on the in- verter P.C. board? Check the connection of the connectors (CN931, CN932) of the outdoor fan motor. If the connection is poor, make it correct. Operate the outdoor unit by starting EMERGENCY OPERATION. - Page 41 M How to check miswiring and serial signal error MUZ-FH25/35 Turn the power supply OFF. Is there rated voltage in the power supply? Check the power supply. Check for incorrect indoor-outdoor connecting wiring. Was the indoor unit ever connected to the Multi (MXZ) series and operated (turned on)? The connection information to the Multi series is stored...
- Page 42 MUZ-FH50 Turn the power supply OFF. NOTE: Refer to the indoor unit service manual. Is there rated voltage in the power supply? Check the power supply. Check for incorrect indoor-outdoor connecting wiring. Was the indoor unit ever connected to the Multi •...
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Page 43: Outdoor Unit
N Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 3 m, or is the the indoor unit, and/or the antennas and the distance between the antennas and the outdoor unit. - Page 44 11-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-FH25VE MUZ-FH35VE Smoothing Smoothing R.V.coil capacitor capacitor (CN721) DB61 Back side of unit (C62) (C61) 230 VAC 260 - 370 VDC Fuse (F701) T3.15AL250V Fuse (F801) 230 VAC T3.15AL250V Fuse (F901) T3.15AL250V Output to drive outdoor...
- Page 45 MUZ-FH50VE Fuse (F601) T3.15AL250V R.V. coil (CN602) 230VAC Heater (CN601) 230VAC Signal of out- door fan motor (CN931) LEV connector (CN724) Output to drive outdoor fan motor Defrost thermistor (CN932) /RT61 (CN671) Discharge temperature thermistor/RT62 Fuse (F901) (CN671) T3.15AL250V Outdoor heat exchanger temperature thermistor /RT68 (CN671) Ambient temperature...
- Page 46 2. Relay P.C. board MUZ-FH50VE CN60 To inverter P.C. board CN681 (CN680) L68B(-) 10 VDC L68A(+) OBH624A...
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Page 47: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types (refer to (1) and (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. - Page 48 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the cabinet and panels. (Refer to 1.) Screws of the heat sink Ambient temperature (2) Disconnect the lead wire to the reactor and the following con- support and the separator thermistor nectors:...
- Page 49 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 6 (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931, CN932 (Fan motor) (3) Remove the propeller nut. (4) Remove the propeller. Outdoor heat (5) Remove the screws fixing the fan motor.
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Page 50: Muz-Fh50Ve
12-2. MUZ-FH50VE NOTE: Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. Screws of the top panel (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover. (4) Remove the service panel. - Page 51 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 and relay P.C. board (1) Remove the cabinet and panels. (Refer to 1.) Screws of the (2) Disconnect the lead wire to the reactor and the following con- relay panel Inverter P.C.
- Page 52 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 5 Ambient defrost thermistor, outdoor heat exchanger tempera- Outdoor heat temperature exchanger ture thermistor and ambient temperature thermistor thermistor temperature thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
- Page 53 OBH624A...
- Page 54 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Mar. 2013. No. OBH624 REVISED EDITION-A New publication, effective Mar. 2013 Distributed in Oct. 2012. No. OBH624 Specifications are subject to change without notice.