Mitsubishi Electric MUZ-FH25VEHZ Service Manual

Outdoor unit

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OUTDOOR UNIT

SERVICE MANUAL

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MUZ-FH25VEHZ

MUZ-FH35VEHZ

MUZ-FH50VEHZ

MUZ-FH25VEHZ

MUZ-FH35VEHZ

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RoHS compliant products have <G> mark on the spec name plate.

Indoor unit service manual

MSZ-FH•VE Series (OBH623)

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 ···················· 48

PARTS CATALOG (OBB625)

• MUZ-FH50VEHZ-

has been added.

No. OBH625

REVISED EDITION-A

Table of Contents

Troubleshooting

Summary of Contents for Mitsubishi Electric MUZ-FH25VEHZ

Page 1: Table Of Contents
SPLIT-TYPE AIR CONDITIONERS OUTDOOR UNIT No. OBH625 SERVICE MANUAL REVISED EDITION-A utilized R410A Models MUZ-FH25VEHZ MUZ-FH35VEHZ MUZ-FH50VEHZ Indoor unit service manual MSZ-FH•VE Series (OBH623) CONTENTS 1. TECHNICAL CHANGES ··································· 3 2. PART NAMES AND FUNCTIONS ····················· 3 3. SPECIFICATION ················································ 4 4.
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-FH25VEHZ - MUZ-FH35VEHZ - MUZ-FH50VEHZ - 1. New model PART NAMES AND FUNCTIONS MUZ-FH25VEHZ MUZ-FH35VEHZ Air inlet (back and side) Piping Drain hose Air outlet Drain outlet MUZ-FH50VEHZ Air inlet (back and side) Piping Drain hose Air outlet...
Page 4: Specification
SPECIFICATION Outdoor model MUZ-FH25VEHZ MUZ-FH35VEHZ Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (0.8 - 3.5) 3.5 (0.8 - 4.0) Capacity Rated frequency (Min.-Max.) Heating 3.2 (1.0 - 6.3) 4.0 (1.0 - 6.6) Breaker Capacity Cooling Power input 1 (Total)
Page 5 Outdoor model MUZ-FH50VEHZ 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-FH25VEHZ MUZ-FH35VEHZ 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 Defrost heater 230 V 130 W...
Page 7: Noise Criteria Curves
NOISE CRITERIA CURVES MUZ-FH25VEHZ MUZ-FH35VEHZ 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...
Page 8: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-FH25VEHZ Unit: mm REQUIRED SPACE MUZ-FH35VEHZ 100 mm or more Drain hole ø33 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...
Page 9: Wiring Diagram
WIRING DIAGRAM MUZ-FH25VEHZ MUZ-FH35VEHZ OBH625A...
Page 10 MUZ-FH50VEHZ OBH625A...
Page 11: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit: mm MUZ-FH25VEHZ MUZ-FH35VEHZ 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...
Page 12 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFEFRENCE Refrigerant piping: m Piping size O.D: mm Model Max. Length A Max. Height difference B Liquid MUZ-FH25/35 9.52 6.35 MUZ-FH50 12.7 6.35 Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: g) Refrigerant piping length (one way) Outdoor unit Model...
Page 13: Performance Curves
PERFORMANCE CURVES MUZ-FH25VEHZ MUZ-FH35VEHZ MUZ-FH50VEHZ 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-FH25VEHZ 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)
Page 16: Cool Operation
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-FH25VEHZ MUZ-FH35VEHZ MUZ-FH50VEHZ (kgf/cm [Gauge])(MPa [Gauge]) (kgf/cm [Gauge])(MPa [Gauge]) (kgf/cm [Gauge])(MPa [Gauge]) Ambient temperature(°C)
Page 17 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FH25VEHZ 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...
Page 18 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FH25VEHZ 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...
Page 19 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FH35VEHZ 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-FH35VEHZ 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-FH50VEHZ 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-FH50VEHZ 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-FH25VEHZ 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...
Page 24: Actuator Control
ACTUATOR CONTROL MUZ-FH25VEHZ MUZ-FH35VEHZ MUZ-FH50VEHZ 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.
Page 25: Service Functions
SERVICE FUNCTIONS MUZ-FH25VEHZ MUZ-FH35VEHZ MUZ-FH50VEHZ 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...
Page 26: Troubleshooting
TROUBLESHOOTING MUZ-FH25VEHZ MUZ-FH35VEHZ MUZ-FH50VEHZ 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: 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 28 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 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: 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 31 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-FH25VEHZ MUZ-FH35VEHZ MUZ-FH50VEHZ 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.
Page 33: A How To Check Inverter/Compressor
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”. Replace the inverter P.C. board. Are the voltages balanced? 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.
Page 40 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 •...
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 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-FH25VEHZ MUZ-FH35VEHZ Smoothing Smoothing R.V.coil Heater connector capacitor capacitor (CN721) DB61 (CN722) Back side of unit (C62) (C61) 230 VAC 260 - 370 VDC Fuse (F701) T3.15AL250V Fuse (F801) 230 VAC T3.15AL250V...
Page 46 MUZ-FH50VEHZ 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 47 2. Relay P.C. board MUZ-FH50VEHZ CN60 To inverter P.C. board CN681 (CN680) L68B(-) 10 VDC L68A(+) OBH625A...
Page 48: Disassembly Instructions
Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 12-1. MUZ-FH25VEHZ MUZ-FH35VEHZ NOTE: Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screw fixing the service panel.
Page 49 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 50 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> Outdoor heat CN931, CN932 (Fan motor) exchanger tempera- (3) Remove the propeller nut. ture thermistor (4) Remove the propeller.
Page 51 12-2. MUZ-FH50VEHZ 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 52 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 and relay P.C. board Screws of the Screw of the (1) Remove the cabinet and panels. (Refer to 1.) relay panel P.B. support Earth wires (2) Disconnect the lead wire to the reactor and the following con- nectors: <Inverter P.C.
Page 53 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 5 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat Ambient exchanger temperature ture thermistor and ambient temperature thermistor temperature 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 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. OBH625 REVISED EDITION-A New publication, effective Mar. 2013 Distributed in Jul. 2012. No. OBH625 Specifications are subject to change without notice.

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Mitsubishi Electric MUZ-FH25VEHZ Service Manual

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OUTDOOR UNIT

SERVICE MANUAL

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