Table of Contents
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SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-EF25VE
MUZ-EF25VE
MUZ-EF25VEH
MUZ-EF25VEH
MUZ-EF35VE
MUZ-EF35VE
MUZ-EF25VE MUZ-EF25VEH
MUZ-EF35VE MUZ-EF35VEH
MUZ-EF42VE
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
• MUZ-EF25/35/42/50VE -
have been added.
Please void OBH590 REVISED EDITION-A.
MUZ-EF35VEH
-
E1
MUZ-EF35VEH
-
E2
MUZ-EF42VE
-
E1
MUZ-EF42VE
-
E2
MUZ-EF50VE
-
E1
MUZ-EF50VE
-
E2
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 5
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 ··································· 27
10. SERVICE FUNCTIONS ···································· 28
11. TROUBLESHOOTING ····································· 29
12. DISASSEMBLY INSTRUCTIONS ···················· 46
PARTS CATALOG (OBB590)
and MUZ-EF25/35VEH -
E2
No. OBH590
HFC
REVISED EDITION-B
utilized
R410A
Indoor unit service manual
MSZ-EF•VE Series (OBH589)
E2
-
E1
-
E2
-
E1
-
E2
-
E1
-
E2
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Table of Contents
Troubleshooting
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Related Manuals for Mitsubishi Electric MUZ-EF25VE - E1
Summary of Contents for Mitsubishi Electric MUZ-EF25VE - E1
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Page 1: Table Of Contents
Revision B: • MUZ-EF25/35/42/50VE - and MUZ-EF25/35VEH - have been added. SPLIT-TYPE AIR CONDITIONERS Please void OBH590 REVISED EDITION-A. OUTDOOR UNIT No. OBH590 SERVICE MANUAL REVISED EDITION-B utilized R410A Models MUZ-EF25VE MUZ-EF35VEH MUZ-EF25VE MUZ-EF35VEH MUZ-EF25VEH MUZ-EF42VE MUZ-EF25VEH MUZ-EF42VE MUZ-EF35VE MUZ-EF50VE MUZ-EF35VE MUZ-EF50VE Indoor unit service manual... -
Page 2: Revision B
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-EF25VE - MUZ-EF25VEH - MUZ-EF35VE - MUZ-EF35VEH - MUZ-EF42VE - MUZ-EF50VE - 1. New model MUZ-EF25VE - MUZ-EF25VE - MUZ-EF25VEH - MUZ-EF25VEH - MUZ-EF35VE - MUZ-EF35VE - MUZ-EF35VEH - MUZ-EF35VEH - MUZ-EF42VE - MUZ-EF42VE - MUZ-EF50VE - MUZ-EF50VE - 1. -
Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE Air inlet (back and side) Piping Drain hose Air outlet Drain outlet MUZ-EF50VE Air inlet (back and side) Piping Drain hose Air outlet Drain outlet ACCESSORIES MUZ-EF25VE MUZ-EF35VE MODELS MUZ-EF42VE MUZ-EF50VE Drain socket OBH590B... -
Page 5: Specification
SPECIFICATION MUZ-EF25VE MUZ-EF35VE Outdoor model MUZ-EF42VE MUZ-EF50VE MUZ-EF25VEH MUZ-EF35VEH Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (1.2 - 3.4) 3.5 (1.4 - 4.0) 4.2 (0.9 - 4.6) 5.0 (1.4 - 5.4) Capacity Rated frequency (Min.-Max.) Heating 3.2 (1.1 - 4.2) 4.0 (1.8 - 5.5) 5.4 (1.4 - 6.3) 5.8 (1.6 - 7.5) - Page 6 Specifi cations and rated conditions of main electric parts Model MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE MUZ-EF50VE Item (C61, C62) 620 μF 420 V Smoothing capacitor (C63) — 620 μF 420 V Diode module (DB61) 15 A 600 V 25 A 600 V (F61) T20AL250V Fuse...
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Page 7: Noise Criteria Curves
NOISE CRITERIA CURVES MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH 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-EF42VE MUZ-EF50VE... -
Page 8: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE Unit: mm REQUIRED SPACE 100 mm or more Drain hole ø42 (MUZ-EF25/35/42VE) Drain hole ø33 (MUZ-EF25/35VEH) 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... -
Page 9: Wiring Diagram
WIRING DIAGRAM MUZ-EF25VE MUZ-EF35VE MUZ-EF25VEH MUZ-EF35VEH OBH590B... - Page 10 MUZ-EF42VE MUZ-EF50VE OBH590B...
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Page 11: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-EF25VE MUZ-EF25VEH Unit: mm 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 Strainer... - Page 12 MUZ-EF50VE Unit: mm Muffler Refrigerant pipe ø 12.7 #100 4-way valve (with heat insulator) Stop valve (with service port) Outdoor Flared connection Discharge heat Ambient temperature exchanger temperature thermistor Defrost thermistor RT62 thermistor RT65 RT61 Compressor Outdoor heat exchanger temperature thermistor RT68 Flared connection...
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Page 13: Performance Curves
PERFORMANCE CURVES MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE MUZ-EF50VE 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 11.5 13.1 10.5 11.8 10.6 Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 17.6 20.6 27.8 28.7 16.2 19.0 25.7 26.5 14.9 17.4 23.5 24.3 13.5 15.8...
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Page 15: Muz-Ef42Ve
8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-EF25VE MUZ-EF25VEH Correction of Cooling capacity Correction of Cooling input Correction of Heating capacity Correction of Heating input The operational frequency The operational frequency The operational frequency The operational frequency of compressor (Hz) of compressor (Hz) of compressor (Hz) -
Page 16: Cool Operation
8-3. HOW TO OPERATE FIXED-FREQUENCY OPERATION <Test run operation> 1. Press EMERGENCY OPERATION switch to start COOL or HEAT mode (COOL: Press once, HEAT: Press twice). 2. Test run operation starts and continues to operate for 30 minutes. 3. Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode. 4. -
Page 17: Heat Operation
Outdoor unit current MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE Ambient temperature(°C) Ambient temperature (°C) Ambient temperature (°C) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) MUZ-EF50VE Ambient temperature (°C) Ambient humidity(%) HEAT operation Condition: Indoor Outdoor Dry bulb temperature (°C) 20.0 20.0 Wet bulb temperature (°C) 14.5 14.5 Operation: Test run operation (Refer to 8-3.) Outdoor unit current... - Page 18 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF25VE MUZ-EF25VEH CAPACITY: 2.5 kW SHF: 0.92 INPUT: 545 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 2.94 2.17 0.74 2.81 2.08 0.74 2.70 2.00 0.74 2.60 1.92 0.74...
- Page 19 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF25VE MUZ-EF25VEH CAPACITY: 2.5 kW SHF: 0.92 INPUT: 545 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 2.45 1.81 0.74 2.25 1.67 0.74 2.08 1.54 0.74 2.58 1.60 0.62 2.40...
- Page 20 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF35VE MUZ-EF35VEH CAPACITY: 3.5 kW SHF: 0.80 INPUT: 910 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.11 2.55 0.62 3.94 2.44 0.62 3.78 2.34 0.62 3.64 2.26 0.62...
- Page 21 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF35VE MUZ-EF35VEH CAPACITY: 3.5 kW SHF: 0.80 INPUT: 910 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.43 2.13 0.62 3.15 1.95 0.62 2.91 1.80 0.62 3.61 1.80 0.50 3.36...
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Page 22: Muz-Ef42Ve
PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF42VE CAPACITY: 4.2 kW SHF: 0.72 INPUT: 1280 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.94 2.66 0.54 1024 4.73 2.55 0.54 1075 4.54 2.45 0.54 1126 4.37... - Page 23 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF42VE CAPACITY: 4.2 kW SHF: 0.72 INPUT: 1280 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.12 2.22 0.54 1254 3.78 2.04 0.54 1331 3.49 1.88 0.54 1382 4.33 1.82...
- Page 24 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF50VE CAPACITY: 5.0 kW SHF: 0.71 INPUT: 1560 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.11 0.53 1248 5.63 2.98 0.53 1310 5.40 2.86 0.53 1373 5.20...
- Page 25 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-EF50VE CAPACITY: 5.0 kW SHF: 0.71 INPUT: 1560 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.60 0.53 1529 4.50 2.39 0.53 1622 4.15 2.20 0.53 1685 5.15 2.11...
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Page 26: Muz-Ef42Ve
PERFORMANCE DATA HEAT operation at Rated frequency MUZ-EF25VE MUZ-EF25VEH CAPACITY: 3.2 kW INPUT: 700 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... -
Page 27: Actuator Control
ACTUATOR CONTROL MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE MUZ-EF50VE 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 28: Service Functions
SERVICE FUNCTIONS MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE MUZ-EF50VE 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-EF25VE - MUZ-EF25VE -... -
Page 29: Troubleshooting
TROUBLESHOOTING MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE MUZ-EF50VE 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 30: Failure Mode Recall Function
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 31 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 32 3. Outdoor unit failure mode table The left lamp of Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR (Failure mode/protection) (Outdoor P.C. board) mode recall recall function lamp function (Indoor unit) None (Normal) —...
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Page 33: Troubleshooting Check Table
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 34 11-4. TROUBLE CRITERION OF MAIN PARTS MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE MUZ-EF50VE 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.
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Page 35: A How To Check Inverter/Compressor
11-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between compressor and the intelligent power module (IC700). Check the voltage between terminals. See 11-5. “Check of open phase”. Replace the inverter P.C. board. Are the voltages balanced? Check the compressor. See 11-5. - Page 36 D Check of compressor winding ●Disconnect the connector between the compressor and intelligent power module, 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 37 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 38 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 39 J Check of power supply Disconnect the connector between compressor and intelligent power module. Rectify indoor/outdoor Turn ON power supply and press connecting wire. EMERGENCY OPERATION switch. Does The left lamp of OPERATION Is there voltage 230 VAC Replace the indoor INDICATOR lamp on the indoor unit between the indoor terminal electronic control P.C.
- Page 40 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 seconds.
- Page 41 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 42 M How to check miswiring and serial signal error Turn the main 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 43 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 O Check of defrost heater MUZ-EF•VEH Check the following points before checking electric continuity. 1. Does the resistance of ambient temperature thermistor have the characteristics? Refer to 11-6.1. 2. Is the resistance of defrost heater normal? Refer to 11-4. 3. Does the heater protector remain conducted (not open)? 4.
- Page 45 11-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE MUZ-EF50VE Heater connector (CN722) Smoothing Smoothing Smoothing R.V.coil MUZ-EF25/35VEH capacitor (C63) capacitor capacitor (CN721) DB61 MUZ-EF42/50VE Back side of unit MUZ-EF42/50VE (C62) (C61) 230 VAC 260 - 370 VDC Fuse (F701) T3.15AL250V...
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Page 46: 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 47 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 Screws of the terminal block (2) Disconnect the lead wire to the reactor and the following con- support and the separator support and the back panel nectors:...
- Page 48 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 6 Ambient temperature (1) Remove the cabinet and panels. (Refer to 1.) thermistor (2) Disconnect the following connectors: <Inverter P.C. board> CN931, CN932 (Fan motor) (3) Remove the propeller nut. Outdoor heat (4) Remove the propeller.
- Page 49 12-2. MUZ-EF50VE 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 50 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 Screw of the terminal (1) Remove the cabinet and panels. (Refer to 1.) Screw of the heat sink block support and the (2) Disconnect the lead wire to the reactor and the following con- support and the separator back panel nectors:...
- Page 51 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 6 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat Ambient tem- ture thermistor and ambient temperature thermistor exchanger tempera- perature ture thermistor 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 52 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2010 MITSUBISHI ELECTRIC CORPORATION Distributed in Nov. 2012. No. OBH590 REVISED EDITION-B Distributed in Mar. 2011. No. OBH590 REVISED EDITION-A Distributed in Nov. 2010. No. OBH590 New publication, effective Nov. 2012 Made in Japan Specifications are subject to change without notice.
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