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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-FT25VGHZ
MUZ-FT35VGHZ
MUZ-FT50VGHZ
MUZ-FT25VGHZ
HFC
utilized
R32
-
E1
,
ET1
,
SC1
-
E1
,
ET1
,
SC1
-
E1
,
ET1
,
SC1
Indoor unit service manual
MSZ-FT∙VG Series (OBH864)
CONTENTS
1. TECHNICAL CHANGES ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 2
USING REFRIGERANT R32 ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 3
3. PART NAMES AND FUNCTIONS ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 5
4. SPECIFICATION ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 6
5. NOISE CRITERIA CURVES ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 8
6. OUTLINES AND DIMENSIONS∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 9
8. REFRIGERANT SYSTEM DIAGRAM ∙∙∙∙∙∙∙∙∙∙∙∙∙ 13
9. PERFORMANCE CURVES ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 15
10. ACTUATOR CONTROL ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 27
11. SERVICE FUNCTIONS ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 28
12. TROUBLESHOOTING ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 29
13. DISASSEMBLY INSTRUCTIONS ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 49
PARTS CATALOG (OBB865)
No. OBH865
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Table of Contents
Related Manuals for Mitsubishi Electric MUZ-FT25VGHZ-E1
Summary of Contents for Mitsubishi Electric MUZ-FT25VGHZ-E1
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Page 1: Table Of Contents
OUTDOOR UNIT No. OBH865 SERVICE MANUAL utilized Models MUZ-FT25VGHZ MUZ-FT35VGHZ MUZ-FT50VGHZ Indoor unit service manual MSZ-FT∙VG Series (OBH864) CONTENTS 1. TECHNICAL CHANGES ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 2 2. SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32 ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 3 3. PART NAMES AND FUNCTIONS ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙ 5 4. -
Page 2: Technical Changes
Use the specified 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: Servicing Precautions For Units
SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32 Servicing precautions for units using refrigerant R32 WARNING This unit uses a flammable refrigerant. If refrigerant leaks and comes in contact with fire or heating part, it will create harmful gas and there is risk of fire. Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer. - Page 4 5. Detection of Flammable Refrigerants Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used. 6. Leak Detection Methods Electronic leak detectors may be used to detect refrigerant leaks but, in the case of flammable refrigerants, the sensitivity may not be adequate, or may need recalibration.
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Page 5: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-FT25VGHZ Air inlet (Back and side) Piping Air outlet Drain hose Drain outlet MUZ-FT35VGHZ MUZ-FT50VGHZ Air inlet (back and side) Piping Air outlet Drain hose Drain outlet OBH865... -
Page 6: Specification
SPECIFICATION Outdoor model MUZ-FT25VGHZ MUZ-FT35VGHZ MUZ-FT50VGHZ Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (0.8 - 3.5) 3.5 (0.8 - 4.0) 5.0 (0.8 - 5.2) Capacity Rated (Min.-Max.) Heating 3.2 (0.9 - 6.2) 4.0 (0.9 - 6.6) 5.0 (0.9 - 7.8) Breaker Capacity Cooling 1,630... - Page 7 Specifications and rated conditions of main electric parts Model MUZ-FT25VGHZ MUZ-FT35VGHZ MUZ-FT50VGHZ Item Smoothing capacitor (C61, C62, C63) 600 µF/ 620 µF 420 V (DB61) 15 A 600 V 25A 600 V Diode module (DB65) 25A 600V Fuse (F701, F801, F901) T3.15AL250V Defrost heater 230 V 60 W...
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Page 8: Noise Criteria Curves
NOISE CRITERIA CURVES MUZ-FT35VGHZ MUZ-FT25VGHZ 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 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz BAND CENTER FREQUENCIES, Hz MUZ-FT50VGHZ FUNCTION SPL(dB(A)) LINE... -
Page 9: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-FT25VGHZ Unit: mm OBH865... - Page 10 MUZ-FT35VGHZ MUZ-FT50VGHZ Unit: mm OBH865...
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Page 11: Wiring Diagram ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙11
WIRING DIAGRAM MUZ-FT25VGHZ - MUZ-FT35VGHZ - MUZ-FT50VGHZ - OBH865... - Page 12 MUZ-FT25VGHZ - MUZ-FT35VGHZ - MUZ-FT50VGHZ - OBH865...
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Page 13: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit: mm MUZ-FT25VGHZ Refrigerant pipe ø9.52 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature Outdoor thermistor Muffler Discharge heat RT68 Flared connection exchanger temperature thermistor RT62 Ambient Compressor temperature thermistor RT65 Defrost thermistor RT61 Strainer #100... - Page 14 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 MUZ-FT25VGHZ MUZ-FT35VGHZ 9.52 6.35 MUZ-FT50VGHZ Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R32: g) Refrigerant piping length (one way) Outdoor unit Model...
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Page 15: Performance Curves
PERFORMANCE CURVES MUZ-FT25VGHZ MUZ-FT35VGHZ MUZ-FT50VGHZ 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 16 9-1. CAPACITY AND INPUT CURVES Cooling capacity (at Rated frequency) 11.2 Indoor intake air Wet-bulb 10.3 temperature( ) Outdoor intake air Dry-bulb temperature(°C) Total input (Cooling : at Rated frequency) Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 15.9...
- Page 17 9-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-FT25VGHZ 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)
- Page 18 9-4. 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 9-3.) Outdoor low pressure MUZ-FT25VGHZ MUZ-FT35VGHZ (kgf/cm [Gauge])(MPa [Gauge]) (kgf/cm...
- Page 19 Outdoor unit current MUZ-FT25VGHZ MUZ-FT35VGHZ MUZ-FT50VGHZ Ambient temperature(°C) Ambient temperature(°C) Ambient temperature(°C) Ambient humidity(%) Ambient humidity(%) 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 9-3.) Outdoor unit current MUZ-FT25VGHZ MUZ-FT35VGHZ...
- Page 20 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FT25VGHZ CAPACITY: 2.5 kW SHF: 0.95 INPUT: 580 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 21 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FT25VGHZ CAPACITY: 2.5 kW SHF: 0.95 INPUT: 580 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 22 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FT35VGHZ CAPACITY: 3.5 kW SHF: 0.8 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 4.29...
- Page 23 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FT35VGHZ CAPACITY: 3.5 kW SHF: 0.8 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 1.68...
- Page 24 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FT50VGHZ CAPACITY: 5.0 kW SHF: 0.69 INPUT: 1630 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.00 0.51 1304 5.63 2.87 0.51 1369 5.40 2.75 0.51 1434 5.20...
- Page 25 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-FT50VGHZ CAPACITY: 5.0 kW SHF: 0.69 INPUT: 1630 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.50 0.51 1597 4.50 2.30 0.51 1695 4.15 2.12 0.51 1760 5.15 2.01...
- Page 26 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-FT25VGHZ CAPACITY: 3.2 kW INPUT: 760 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT 0.80 1.22 1.60 2.02 2.43 2.85 3.26 3.68 4.06 4.48 0.74 1.12 1.50...
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Page 27: Actuator Control
ACTUATOR CONTROL MUZ-FT25VGHZ MUZ-FT35VGHZ MUZ-FT50VGHZ 10-1. 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-FT25VGHZ MUZ-FT35VGHZ MUZ-FT50VGHZ 11-1. 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 12-6.1) Defrost finish temperature (°C) Jumper wire MUZ-FT25/35VGHZ MUZ-FT50VGHZ Soldered (Initial setting) -
Page 29: Troubleshooting
TROUBLESHOOTING MUZ-FT25VGHZ MUZ-FT35VGHZ MUZ-FT50VGHZ 12-1. 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 12-2. 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 (12-3.) 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. Check if outdoor unit is abnormal according to the following procedures. Make sure that the remote controller is set to the failure mode recall function. 1.
- Page 32 3. Outdoor unit failure recall mode table NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.). Upper lamp of Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure INDICATOR Condition Remedy failure mode (Failure mode/protection) (Outdoor P.C.
- Page 33 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.). Upper lamp of Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure INDICATOR Condition Remedy failure mode (Failure mode/protection) (Outdoor P.C. board) mode recall lamp recall function (Indoor unit)
- Page 34 12-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Con- Symptom LED indication Condition Remedy dition Outdoor unit 1-time blink 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 35 Abnormal point/ Con- Symptom LED indication Condition Remedy dition Outdoor unit 7-time blink Low discharge tem- Temperature of discharge temperature thermistor has been • Refer to 12-5. "Check of LEV". operates. 2.5 seconds OFF perature protection 50°C or less for 20 minutes. •...
- Page 36 12-4. TROUBLE CRITERION OF MAIN PARTS MUZ-FT25VGHZ MUZ-FT35VGHZ MUZ-FT50VGHZ Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a tester. Refer to 12-6. “Test point diagram and voltage”, 1. “Inverter P.C. Fin temperature board”, for the chart of thermistor. thermistor (RT64) Ambient temperature thermistor (RT65)
- Page 37 12-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700). See 12-5. “Check of open phase”. Check the voltage between terminals. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. See 12-5.
- Page 38 D Check of compressor winding ● Disconnect the connector between the compressor and the power module (IC700), 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 39 G Check of outdoor thermistors Disconnect the connector of thermistor in the inverter 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 12-6.1.) board.
- Page 40 H Check of R.V. coil First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 12-4. 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 41 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 12-4.) Disconnect CN932 from the inverter P.C.
- Page 42 J Check of power supply Disconnect the connector between the compressor and the power module (IC700). Turn ON power supply and press EMERGENCY OPERATION Rectify indoor/outdoor switch. connecting wire. Does the upper lamp of Is there voltage 230VAC Replace the indoor OPERATION INDICATOR lamp on between the indoor terminal electronic control P.C.
- Page 43 K Check of LEV (Expansion valve) FT25/35/50VG - FT25/35/50VGK - FT25/35/50VGK - 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.
- Page 44 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 12-5. .) 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 45 M How to check miswiring and serial signal error 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 in the indoor unit.
- Page 46 N Check of the outdoor refrigerant circuit The operation has stopped to prevent the diesel explosion caused by air trapped in the refrigerant circuit. Close the stop Has the operation stopped during pump down? valve, and disconnect the power plug or turn the breaker OFF. CAUTION: Do not start the operation again to prevent hazards.
- Page 47 O 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 48 12-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-FT25VGHZ MUZ-FT35VGHZ MUZ-FT50VGHZ Smoothing Smoothing Smoothing R.V.coil Defrost Back side of unit capacitor capacitor capacitor (CN721) heater (C61) (C62) (C63) 230 V AC (CN722) DB61 230 V AC 260 - 370 V DC Fuse (F701) Fuse (F801) T3.15AL250V...
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Page 49: 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 2 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 50 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 4 Screw of the P.B. support board and the separator (1) Remove the cabinet and panels. (Refer to section 1.) Screws of Screw of the heat sink (2) Disconnect the lead wire to the reactor and the following the terminal block support and the separator support and...
- Page 51 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing R.V. coil Photo 7 (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: Outdoor heat <Inverter P.C. board> exchanger tempera- CN721 (R.V. coil) ture thermistor (3) Remove the R.V. coil. 4.
- Page 52 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the compressor and 4-way valve Photo 9 Discharge pipe Suction pipe (1) Remove the cabinet and panels. (Refer to section 1.) (2) Remove the inverter assembly. (Refer to section 2.) brazed part brazed part (3) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 kg/cm...
- Page 53 13-2. MUZ-FT35VGHZ MUZ-FT50VGHZ NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 Screws of the top panel (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
- Page 54 OPERATING PROCEDURE PHOTOS/FIGURES Screw of the P.B. support 2. Removing the inverter assembly and inverter P.C. Photo 3 and the separator board Screw of the heat sink (1) Remove the cabinet and panels. (Refer to section 1.) Screws of (2) Disconnect the lead wire to the reactor and the following con- support and the separator the terminal block nectors:...
- Page 55 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing R. V. coil Photo 6 Screw of the R.V. coil (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN721 (R.V. coil) (3) Remove the R.V. coil. Discharge temperature thermistor Ambient temperature Photo 7...
- Page 56 (7) Detach the brazed part of pipes connected with 4-way valve. Brazed parts of 4-way valve HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2020 MITSUBISHI ELECTRIC CORPORATION Published: Jun. 2020. No. OBH865 Made in Japan...