Table of Contents
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SPLIT-TYPE AIR CONDITIONERS
SERVICE MANUAL
Models
MUZ-SF25VE
MUZ-SF25VEH
MUZ-SF35VE
MUZ-SF35VEH
MUZ-SF25VE MUZ-SF25VEH
MUZ-SF35VE MUZ-SF35VEH
MUZ-SF42VE MUZ-SF42VEH
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
MUZ-SF42VE
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E1
MUZ-SF42VEH
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E1
MUZ-SF50VE
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E1
MUZ-SF50VEH
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E1
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 5
4. NOISE CRITERIA CURVES ······························ 6
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 ····································· 28
12. DISASSEMBLY INSTRUCTIONS ···················· 45
PARTS CATALOG (OBB629)
No. OBH629
HFC
utilized
R410A
Indoor unit service manual
MSZ-SF•VE Series (OBH600)
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E1
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E1
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E1
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E1
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Table of Contents
Related Manuals for Mitsubishi Electric MUZ-SF25VE-E1
Summary of Contents for Mitsubishi Electric MUZ-SF25VE-E1
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Page 1: Table Of Contents
SPLIT-TYPE AIR CONDITIONERS OUTDOOR UNIT No. OBH629 SERVICE MANUAL utilized R410A Models MUZ-SF25VE MUZ-SF42VE MUZ-SF25VEH MUZ-SF42VEH MUZ-SF35VE MUZ-SF50VE MUZ-SF35VEH MUZ-SF50VEH Indoor unit service manual MSZ-SF•VE Series (OBH600) CONTENTS MUZ-SF25VE MUZ-SF25VEH MUZ-SF35VE MUZ-SF35VEH 1. TECHNICAL CHANGES ··································· 3 MUZ-SF42VE MUZ-SF42VEH 2. PART NAMES AND FUNCTIONS ····················· 4 3. - Page 2 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.
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Page 3: Technical Changes
TECHNICAL CHANGES MUZ-SF25VE - MUZ-SF25VEH - MUZ-SF35VE - MUZ-SF35VEH - MUZ-SF42VE - MUZ-SF42VEH - MUZ-SF50VE - MUZ-SF50VEH - 1. New model OBH629... -
Page 4: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-SF25VE MUZ-SF25VEH MUZ-SF35VE MUZ-SF35VEH MUZ-SF42VE MUZ-SF42VEH Air inlet (back and side) Piping Drain hose Air outlet Drain outlet MUZ-SF50VE MUZ-SF50VEH Air inlet (back and side) Piping Drain hose Air outlet Drain outlet ACCESSORIES MUZ-SF25VE MUZ-SF35VE MODELS MUZ-SF42VE MUZ-SF50VE Drain socket... -
Page 5: Specification
SPECIFICATION MUZ-SF25VE MUZ-SF35VE MUZ-SF42VE MUZ-SF50VE Outdoor model MUZ-SF25VEH MUZ-SF35VEH MUZ-SF42VEH MUZ-SF50VEH Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (0.9 - 3.4) 3.5 (1.1 - 3.8) 4.2 (0.8 - 4.5) 5.0 (1.4 - 5.4) Capacity Rated frequency (Min.-Max.) Heating 3.2 (1.0 - 4.1) 4.0 (1.3 - 4.6) -
Page 6: Noise Criteria Curves
Specifi cations and rated conditions of main electric parts Model MUZ-SF25VE MUZ-SF25VEH MUZ-SF35VE MUZ-SF35VEH MUZ-SF42VE MUZ-SF42VEH MUZ-SF50VE MUZ-SF50VEH 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... - Page 7 MUZ-SF42VE MUZ-SF42VEH MUZ-SF50VE MUZ-SF50VEH FUNCTION SPL(dB(A)) LINE FUNCTION SPL(dB(A)) 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 Test conditions Cooling: Dry-bulb temperature 35°C...
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Page 8: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-SF25VE MUZ-SF25VEH MUZ-SF35VE MUZ-SF35VEH Unit: mm MUZ-SF42VE MUZ-SF42VEH REQUIRED SPACE 100 mm or more Drain hole ø42 (MUZ-SF25/35/42VE) Drain hole ø33 (MUZ-SF25/35/42VEH) 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-SF25VE MUZ-SF35VE MUZ-SF25VEH MUZ-SF35VEH OBH629... - Page 10 MUZ-SF42VE MUZ-SF50VE MUZ-SF42VEH MUZ-SF50VEH OBH629...
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Page 11: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-SF25VE MUZ-SF25VEH MUZ-SF35VE MUZ-SF35VEH 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... - Page 12 MUZ-SF50VE MUZ-SF50VEH 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 temperature exchanger thermistor Defrost ther RT62 thermistor RT61 Compressor Outdoor heat exchanger Capillary tube temperature thermistor ø3.0×ø2.0×200(×4) RT68...
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Page 13: Performance Curves
PERFORMANCE CURVES MUZ-SF25VE MUZ-SF25VEH MUZ-SF35VE MUZ-SF35VEH MUZ-SF42VE MUZ-SF42VEH MUZ-SF50VE MUZ-SF50VEH 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: Obh629
Total input (Cooling : at Rated frequency 11.8 13.3 10.7 12.0 10.8 Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 20.3 23.8 32.1 31.6 18.8 21.9 29.6 29.2 17.2 20.1 27.2 26.7 15.6 18.3... -
Page 15: Obh629
8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-SF25VE MUZ-SF25VEH 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: Outdoor Unit
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: Outdoor Unit
Outdoor unit current MUZ-SF25VE MUZ-SF25VEH MUZ-SF35VE MUZ-SF35VEH MUZ-SF42VE MUZ-SF42VEH Ambient temperature(°C) Ambient temperature (°C) Ambient temperature (°C) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) MUZ-SF50VE MUZ-SF50VEH 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... -
Page 18: Obh629
PERFORMANCE DATA COOL operation a t Rated frequency MUZ-SF25VE MUZ-SF25VEH CAPACITY: 2.5 kW SHF: 0.92 INPUT: 600 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: Obh629
PERFORMANCE DATA COOL operation a t Rated frequency MUZ-SF25VE MUZ-SF25VEH CAPACITY: 2.5 kW SHF: 0.92 INPUT: 600 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: Obh629
PERFORMANCE DATA COOL operation a t Rated frequency MUZ-SF35VE MUZ-SF35VEH CAPACITY: 3.5 kW SHF: 0.80 INPUT: 1080 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: Obh629
PERFORMANCE DATA COOL operation a t Rated frequency MUZ-SF35VE MUZ-SF35VEH CAPACITY: 3.5 kW SHF: 0.80 INPUT: 1080 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.43 2.13 0.62 1058 3.15 1.95 0.62 1123 2.91 1.80 0.62 1166 3.61... -
Page 22: Obh629
PERFORMANCE DATA COOL operation a t Rated frequency MUZ-SF42VE MUZ-SF42VEH CAPACITY: 4.2 kW SHF: 0.72 INPUT: 1340 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.94 2.66 0.54 1072 4.73 2.55 0.54 1126 4.54 2.45 0.54 1179... -
Page 23: Obh629
PERFORMANCE DATA COOL operation a t Rated frequency MUZ-SF42VE MUZ-SF42VEH CAPACITY: 4.2 kW SHF: 0.72 INPUT: 1340 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.12 2.22 0.54 1313 3.78 2.04 0.54 1394 3.49 1.88 0.54 1447 4.33... -
Page 24: Obh629
PERFORMANCE DATA COOL operation a t Rated frequency MUZ-SF50VE MUZ-SF50VEH CAPACITY: 5.0 kW SHF: 0.70 INPUT: 1660 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.06 0.52 1328 5.63 2.93 0.52 1394 5.40 2.81 0.52 1461... -
Page 25: Obh629
PERFORMANCE DATA COOL operation a t Rated frequency MUZ-SF50VE MUZ-SF50VEH CAPACITY: 5.0 kW SHF: 0.70 INPUT: 1660 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.55 0.52 1627 4.50 2.34 0.52 1726 4.15 2.16 0.52 1793 5.15... -
Page 26: Obh629
PERFORMANCE DATA HEAT operation at Rated frequency MUZ-SF25VE MUZ-SF25VEH CAPACITY: 3.2 kW INPUT: 780 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-SF25VE MUZ-SF25VEH MUZ-SF35VE MUZ-SF35VEH MUZ-SF42VE MUZ-SF42VEH MUZ-SF50VE MUZ-SF50VEH 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-SF25VE MUZ-SF25VEH MUZ-SF35VE MUZ-SF35VEH MUZ-SF42VE MUZ-SF42VEH MUZ-SF50VE MUZ-SF50VEH 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-SF25/35/42 MUZ-SF50... -
Page 29: 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 30: 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 31: Outdoor Unit
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) —... -
Page 32: 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 33: Obh629
11-4. TROUBLE CRITERION OF MAIN PARTS MUZ-SF25VE MUZ-SF25VEH MUZ-SF35VE MUZ-SF35VEH MUZ-SF42VE MUZ-SF42VEH MUZ-SF50VE MUZ-SF50VEH 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 34: Obh629
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 35: Obh629
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 36: Obh629
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 37: Obh629
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: Obh629
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 39: Obh629
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. -
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: Obh629
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 42: 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 43: Obh629
O Check of defrost heater MUZ-SF•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 44: Obh629
11-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-SF25VE MUZ-SF25VEH MUZ-SF35VE MUZ-SF35VEH MUZ-SF42VE MUZ-SF42VEH MUZ-SF50VE MUZ-SF50VEH Heater connector (CN722) Smoothing Smoothing Smoothing R.V.coil MUZ-SF25/35VEH capacitor (C63) capacitor capacitor (CN721) DB61 MUZ-SF42/50VEH Back side of unit MUZ-SF42/50 (C62) (C61) 230 VAC 260 - 370 VDC Fuse (F701) -
Page 45: 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 46: Obh629
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 47: Obh629
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 48: Obh629
12-2. MUZ-SF50VE MUZ-SF50VEH 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. -
Page 49: Obh629
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 50: Obh629
OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 6 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat ture thermistor and ambient temperature thermistor exchanger tempera- Ambient tem- ture thermistor (1) Remove the cabinet and panels. (Refer to 1.) perature thermistor (2) Disconnect the lead wire to the reactor and the following... -
Page 51: Obh629
OBH629... -
Page 52: Obh629
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Nov. 2012. No. OBH629 New publication, effective Nov. 2012 Made in Japan Specifications are subject to change without notice.