Table of Contents
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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-AP25VG
MUZ-AP35VG
MUZ-AP42VG
MUZ-AP50VG
MUZ-AP25VG
MUZ-AP35VG
MUZ-AP42VG
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
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E1
ET1
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E1
ET1
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E1
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ET1
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E1
ET1
MUZ-AP25VGH
MUZ-AP35VGH
MUZ-AP42VGH
HFC
utilized
R32
MUZ-AP25VGH
MUZ-AP35VGH
MUZ-AP42VGH
MUZ-AP50VGH
Indoor unit service manual
MSZ-AP•VG(K) Series (OBH788)
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. SERVICING PRECAUTIONS FOR UNITS
USING REFRIGERANT R32 ····························· 3
3. PART NAMES AND FUNCTIONS ····················· 5
4. SPECIFICATION ················································ 6
5. NOISE CRITERIA CURVES ······························ 7
6. OUTLINES AND DIMENSIONS ························ 9
7. WIRING DIAGRAM ·········································· 10
8. REFRIGERANT SYSTEM DIAGRAM ············· 13
9. PERFORMANCE CURVES ····························· 15
10. ACTUATOR CONTROL ··································· 29
11. SERVICE FUNCTIONS ···································· 30
12. TROUBLESHOOTING ····································· 31
13. DISASSEMBLY INSTRUCTIONS ···················· 51
PARTS CATALOG (OBB789)
No. OBH789
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Table of Contents
Troubleshooting
Related Manuals for Mitsubishi Electric MUZ-AP25VG - E1
Summary of Contents for Mitsubishi Electric MUZ-AP25VG - E1
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Page 1: Outdoor Unit
OUTDOOR UNIT No. OBH789 utilized SERVICE MANUAL Models MUZ-AP25VG MUZ-AP25VGH MUZ-AP35VG MUZ-AP35VGH MUZ-AP42VG MUZ-AP42VGH MUZ-AP50VG MUZ-AP50VGH Indoor unit service manual MSZ-AP•VG(K) Series (OBH788) MUZ-AP25VG MUZ-AP25VGH CONTENTS MUZ-AP35VG MUZ-AP35VGH 1. TECHNICAL CHANGES ··································· 2 MUZ-AP42VG MUZ-AP42VGH 2. SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32 ·····························... -
Page 2: Technical Changes
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: Using Refrigerant R32
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 re-calibration.
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Page 5: Part Names And Functions
PART NAMES AND FUNCTIONS MUZ-AP25VG MUZ-AP50VG MUZ-AP35VG MUZ-AP50VGH MUZ-AP42VG MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH Air inlet Air inlet (back and side) (back and side) Piping Piping Air outlet Air outlet Drain hose Drain hose Drain outlet Drain outlet ACCESSORIES MUZ-AP25VG MUZ-AP35VG MODELS MUZ-AP42VG MUZ-AP50VG Drain socket... -
Page 6: Specification
SPECIFICATION 1 Measured under rated operating frequency. MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG Outdoor model MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH MUZ-AP50VGH Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (0.9 - 3.4) 3.5 (1.1 - 3.8) 4.2 (0.9 - 4.5) 5.0 (1.4 - 5.4) Capacity Rated frequency (Min.-Max.) Heating... -
Page 7: Noise Criteria Curves
Specifi cations and rated conditions of main electric parts MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- MUZ- Model Item AP25VG AP25VGH AP35VG AP35VGH AP42VG AP42VGH AP50VG AP50VGH 600 μF/ 620 μF 420 V (C61) — Smoothing 600 μF/ 620 μF 420 V capacitor (C62, C63) Diode module... -
Page 8: Table Of Contents
MUZ-AP42VG MUZ-AP50VG MUZ-AP42VGH MUZ-AP50VGH 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 Wet-bulb temperature 24°C... -
Page 9: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG Unit: mm MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH (MUZ-AP25/35/42VG) (MUZ-AP25/35/42VGH) MUZ-AP50VG MUZ-AP50VGH (MUZ-AP50VG) (MUZ-AP50VGH) OBH789... -
Page 10: Wiring Diagram
WIRING DIAGRAM MUZ-AP25VG - MUZ-AP35VG - MUZ-AP25VGH - MUZ-AP35VGH - OBH789... - Page 11 MUZ-AP42VG - MUZ-AP42VGH - OBH789...
- Page 12 MUZ-AP50VG - MUZ-AP50VGH - OBH789...
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Page 13: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-AP25VG MUZ-AP35VG Unit: mm MUZ-AP25VGH MUZ-AP35VGH Refrigerant pipe ø9.52 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler RT68 Discharge heat Flared connection temperature exchanger thermistor RT62 Ambient Compressor temperature thermistor... - Page 14 MUZ-AP50VG Unit: mm MUZ-AP50VGH Refrigerant pipe ø 9.52 Muffler 4-way valve (with heat insulator) Muffler Stop valve (with service port) Outdoor Outdoor heat Flared connection Discharge heat Ambient exchanger temperature exchanger temperature temperature thermistor thermistor thermistor RT62 RT65 RT68 Defrost thermistor RT61 Compressor...
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Page 15: Performance Curves
PERFORMANCE CURVES MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH MUZ-AP50VGH 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 Total input (Cooling : at Rated frequency Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 16.2 20.3 25.2 27.1 15.0 18.7 23.3 25.0 13.7 17.2 21.3 22.9 12.5 15.6 19.4 20.8 11.2 14.0 17.5...
- Page 17 9-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-AP25VG MUZ-AP25VGH 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)
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Page 18: Cool Operation
9-3. 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 19: Heat Operation
Outdoor unit current MUZ-AP42VG MUZ-AP35VG MUZ-AP25VG MUZ-AP35VGH MUZ-AP42VGH MUZ-AP25VGH Ambient temperature(°C) Ambient temperature (°C) Ambient temperature (°C) Ambient humidity(%) Ambient humidity(%) Ambient humidity(%) MUZ-AP50VG MUZ-AP50VGH 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 20 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-AP25VG MUZ-AP25VGH 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 21 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-AP25VG MUZ-AP25VGH 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 22 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-AP35VG MUZ-AP35VGH CAPACITY: 3.5 kW SHF: 0.88 INPUT: 990 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.11 2.88 0.70 3.94 2.76 0.70 3.78 2.65 0.70 3.64 2.55 0.70...
- Page 23 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-AP35VG MUZ-AP35VGH CAPACITY: 3.5 kW SHF: 0.88 INPUT: 990 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.43 2.40 0.70 3.15 2.21 0.70 1030 2.91 2.03 0.70 1069 3.61 2.09...
- Page 24 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-AP42VG MUZ-AP42VGH CAPACITY: 4.2 kW SHF: 0.77 INPUT: 1300 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.94 2.91 0.59 1040 4.73 2.79 0.59 1092 4.54 2.68 0.59 1144...
- Page 25 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-AP42VG MUZ-AP42VGH CAPACITY: 4.2 kW SHF: 0.77 INPUT: 1300 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.12 2.43 0.59 1274 3.78 2.23 0.59 1352 3.49 2.06 0.59 1404 4.33...
- Page 26 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-AP50VG MUZ-AP50VGH CAPACITY: 5.0 kW SHF: 0.74 INPUT: 1550 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.29 0.56 1240 5.63 3.15 0.56 1302 5.40 3.02 0.56 1364...
- Page 27 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-AP50VG MUZ-AP50VGH CAPACITY: 5.0 kW SHF: 0.74 INPUT: 1550 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.74 0.56 1519 4.50 2.52 0.56 1612 4.15 2.32 0.56 1674 5.15...
- Page 28 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-AP25VG MUZ-AP25VGH 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...
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Page 29: Actuator Control
ACTUATOR CONTROL MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH MUZ-AP50VGH 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 30: Service Functions
SERVICE FUNCTIONS MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH MUZ-AP50VGH 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.) Jumper wire Defrost fi... -
Page 31: Troubleshooting
TROUBLESHOOTING MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH MUZ-AP50VGH 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 32 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 33 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 34 3. Table of outdoor unit failure mode recall function NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.). Indoor/outdoor Outdoor unit Abnormal point LED indication unit failure Upper lamp Condition Remedy failure mode (Indoor unit) (Failure mode/protection) (Outdoor P.C.
- Page 35 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.). Indoor/outdoor Outdoor unit Upper 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 10-time fl...
- Page 36 12-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Con- Symptom LED indication Condition Remedy dition 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 37 Abnormal point/ Con- Symptom LED indication Condition Remedy dition Outdoor unit 7-time fl ash 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 38 12-4. TROUBLE CRITERION OF MAIN PARTS Part name Check method and criterion Figure Defrost thermistor (RT61) Fin temperature thermistor (RT64) Measure the resistance with a tester. Ambient temperature Refer to 12-6. “Test point diagram and voltage”, 1. “Inverter P.C. thermistor (RT65) board”, for the chart of thermistor.
- Page 39 12-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700). Check the voltage between terminals. See 12-5. “Check of open phase”. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. See 12-5.
- Page 40 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 41 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 42 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 43 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 44 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. Replace the indoor Does the upper lamp of Is there voltage 230 V AC OPERATION INDICATOR lamp on between the indoor terminal electronic control P.C.
- Page 45 K Check of LEV (Expansion valve) MSZ-AP·VG(K) 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 2 buttons for another 3 seconds.
- Page 46 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 47 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 48 N Check of the outdoor refrigerant circuit The unit occasionally stops when the Was the operation started with Has the operation stopped stop valve is opened or closed during the stop valve closed, and was during pump down? operation. Open the stop valve and it opened during operation? start the cooling operation again.
- Page 49 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 50 12-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-AP25VG MUZ-AP35VG MUZ-AP42VG MUZ-AP50VG MUZ-AP25VGH MUZ-AP35VGH MUZ-AP42VGH MUZ-AP50VGH R.V.coil Defrost heater Smoothing Smoothing Smoothing (CN721) (CN722) DB61 capacitor Back side of unit capacitor (C61) capacitor 230 V AC (MUZ-AP•VGH) 260 - 370 V DC (C62) (MUZ-AP42/50) (C63)
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Page 51: Disassembly Instructions
DISASSEMBLY INSTRUCTIONS <Detaching method of the terminal with locking mechanism > The terminal which has the locking mechanism can be detached as shown below. There are following 2 types 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 52 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the cabinet and panels. (Refer to section 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 53 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 6 (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> Ambient temperature CN931, CN932 (Fan motor) thermistor (3) Remove the propeller fan nut. (4) Remove the propeller fan.
- Page 54 13-2. MUZ-AP50VG MUZ-AP50VGH NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 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 55 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly and inverter P.C. Photo 3 Screw of the P.B. support board and the separator (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following con- Screw of the heat sink nectors: support and the separator...
- Page 56 OPERATING PROCEDURE PHOTOS 3. Removing R. V. coil Photo 6 (1) Remove the cabinet and panels. (Refer to section 1.) Screw of the R.V. coil (2) Disconnect the following connectors: <Inverter P.C. board> CN721 (R.V. coil) (3) Remove the R.V. coil. Discharge temperature thermistor Outdoor heat Photo 7...
- Page 57 OPERATING PROCEDURE PHOTOS 6. Removing the compressor and 4-way valve Photo 9 (1) Remove the cabinet and panels. (Refer to section 1.) Discharge pipe Suction pipe (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 58 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2017 MITSUBISHI ELECTRIC CORPORATION Published: Dec. 2017. No. OBH789 Made in Japan Specifications are subject to change without notice.