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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-AP20VG
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E1
ET1
ER1
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CONTENTS
1. TECHNICAL CHANGES ······························2
USING REFRIGERANT R32 ·························3
3. PART NAMES AND FUNCTIONS ··················5
4. SPECIFICATION ········································6
5. NOISE CRITERIA CURVES ··························7
6. OUTLINES AND DIMENSIONS ·····················8
7. WIRING DIAGRAM ·····································9
8. REFRIGERANT SYSTEM DIAGRAM ··········· 10
9. PERFORMANCE CURVES ························ 11
10. ACTUATOR CONTROL ····························· 18
11. SERVICE FUNCTIONS ······························ 19
12. TROUBLESHOOTING ······························· 20
13. DISASSEMBLY INSTRUCTIONS ················· 40
PARTS CATALOG (OBB839A)
Revision A:
• MUZ-AP20VG-
have been added.
ER1
OBH839 is void.
No. OBH839A
HFC
utilized
R32
Indoor unit service manual
MSZ-AP•VG Series (OBH838)
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Table of Contents
Related Manuals for Mitsubishi Electric MUZ-AP20VG-E1
Summary of Contents for Mitsubishi Electric MUZ-AP20VG-E1
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Page 1: Table Of Contents
Revision A: • MUZ-AP20VG- have been added. OBH839 is void. OUTDOOR UNIT No. OBH839A utilized SERVICE MANUAL Models MUZ-AP20VG Indoor unit service manual MSZ-AP•VG Series (OBH838) CONTENTS 1. TECHNICAL CHANGES ······························2 2. SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R32 ·························3 3. -
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 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-AP20VG Air inlet (Back and side) Piping Air outlet Drain hose Drain outlet ACCESSORIES MODELS MUZ-AP20VG Drain socket OBH839A... -
Page 6: Specification
SPECIFICATION 1 Measured under rated operating frequency. Outdoor model MUZ-AP20VG Power supply Single phase, 230 V, 50 Hz Cooling 2.0 (0.6 - 2.7) Capacity Rated (Min.-Max.) Heating 2.5 (0.5 - 3.5) Breaker Capacity Cooling Power input 1 (Set) Heating Cooling Running current 1 (Set) Heating Cooling... -
Page 7: Noise Criteria Curves
Specifications and rated conditions of main electric parts Model MUZ-AP20VG Item Smoothing (C62, C63) 600 µF/ 620 µF 420 V capacitor Diode module (DB61) 15 A 600 V Diode module (DB65) 25 A 600 V (F61) 25A 250V Fuse (F62) 15A 250V (F701, F801, F901) T3.15AL250V... -
Page 8: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-AP20VG Unit: mm OBH839A... -
Page 9: Wiring Diagram
WIRING DIAGRAM MUZ-AP20VG - OBH839A... -
Page 10: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUZ-AP20VG Unit: mm 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 RT65 Defrost thermistor... -
Page 11: Performance Curves
PERFORMANCE CURVES MUZ-AP20VG 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 12 Total input (Cooling : at Rated frequency Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 22.4 20.7 18.9 17.2 15.5 13.8 12.1 10.3 Outdoor intake air Wet-bulb temperature (°C) Total input (Heating : at Rated frequency 22.4 20.7...
- Page 13 9-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-AP20VG 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) of compressor (Hz)
- Page 14 Outdoor unit current MUZ-AP20VG 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 9-3.) Outdoor unit current MUZ-AP20VG Ambient temperature (°C) OBH839A...
- Page 15 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-AP20VG CAPACITY: 2.0 kW SHF: 0.8 INPUT: 460 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 2.35 1.46 0.62 2.25 1.40 0.62 2.16 1.34 0.62 2.08 1.29 0.62 2.45...
- Page 16 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-AP20VG CAPACITY: 2.0 kW SHF: 0.8 INPUT: 460 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 1.96 1.22 0.62 1.80 1.12 0.62 1.66 1.03 0.62 2.06 1.03 0.50 1.92 0.96...
- Page 17 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-AP20VG CAPACITY: 2.5 kW INPUT: 600 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 1.58 1.90 2.23 2.55 2.88 3.18 3.50 1.50 1.80 2.13 2.43 2.75 3.05 3.36 1.35 1.68...
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Page 18: Actuator Control
ACTUATOR CONTROL MUZ-AP20VG 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 19: Service Functions
SERVICE FUNCTIONS MUZ-AP20VG 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 finish temperature (°C) Soldered (Initial setting) None (Cut) 11-2. -
Page 20: Troubleshooting
TROUBLESHOOTING MUZ-AP20VG 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 21 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 22 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 23 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 24 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 blink Discharge temperature...
- Page 25 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 26 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. perature protection 50°C or less for 20 minutes. • Check refrigerant circuit and refrig- 2.5 seconds OFF erant amount.
- Page 27 12-4. TROUBLE CRITERION OF MAIN PARTS 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 28 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 29 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>> Refer to 12-4. 0 [Ω] ················Abnormal [short] Infinite [Ω] ·······Abnormal [open] NOTE: Be sure to zero the ohmmeter before measurement.
- Page 30 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 31 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 32 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 33 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 230 V AC Replace the indoor OPERATION INDICATOR lamp on between the indoor terminal...
- Page 34 K Check of LEV (Expansion valve) MSZ-AP·VG 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 35 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 36 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 37 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 38 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 39 12-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-AP20VG R.V.coil Smoothing Smoothing (CN721) DB61 capacitor capacitor Back side of unit 230 V AC 260 - 370 V DC (C63) (C62) 230 V AC Fuse (F901) Fuse (F801) Fuse (F701) T3.15AL250V T3.15AL250V T3.15AL250V...
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Page 40: 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 41 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly, inverter P.C. board Photo 4 (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 42 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing outdoor fan motor Photo 7 (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 43 OBH839A...
- Page 44 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued: Dec. 2019. No. OBH839 REVISED EDITION-A Published: Apr. 2019. No. OBH839 Made in Japan Specifications are subject to change without notice.