Table of Contents
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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-BT20VG
MUZ-BT25VG
MUZ-BT35VG
MUZ-BT50VG
MUZ-BT20VG
MUZ-BT25VG
MUZ-BT35VG
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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 ··························8
6. OUTLINES AND DIMENSIONS ·····················9
7. WIRING DIAGRAM ··································· 10
8. REFRIGERANT SYSTEM DIAGRAM ··········· 12
9. PERFORMANCE CURVES ························ 14
10. ACTUATOR CONTROL ····························· 28
11. SERVICE FUNCTIONS ······························ 29
12. TROUBLESHOOTING ······························· 30
13. DISASSEMBLY INSTRUCTIONS ················· 51
PARTS CATALOG (OBB850)
Revision A:
• MUZ-BT20/25/35/50VG -
added.
OBH850 is void.
No. OBH850
HFC
utilized
REVISED EDITION-A
R32
Indoor unit service manual
MSZ-BT∙VG Series (OBH849)
have been
ER1
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Table of Contents
Related Manuals for Mitsubishi Electric MUZ-BT20VG
Summary of Contents for Mitsubishi Electric MUZ-BT20VG
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Page 1: Table Of Contents
Revision A: • MUZ-BT20/25/35/50VG - have been added. OBH850 is void. OUTDOOR UNIT No. OBH850 utilized REVISED EDITION-A SERVICE MANUAL Models MUZ-BT20VG MUZ-BT25VG MUZ-BT35VG MUZ-BT50VG Indoor unit service manual MSZ-BT∙VG Series (OBH849) MUZ-BT20VG CONTENTS MUZ-BT25VG 1. TECHNICAL CHANGES ······························2 MUZ-BT35VG 2. -
Page 2: Technical Changes
Do not touch the hot or cold areas in the refrigeration cycle. When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to touch the live parts. TECHNICAL CHANGES MUZ-BT20VG - MUZ-BT25VG - MUZ-BT35VG - MUZ-BT50VG - 1. -
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-BT20VG MUZ-BT25VG MUZ-BT35VG Air inlet Air inlet (back and side) (back and side) Piping Piping Drain hose Drain hose Air outlet Air outlet Drain outlet Drain outlet MUZ-BT50VG Air inlet (Back and side) Piping Drain hose... -
Page 6: Specification
SPECIFICATION Outdoor model MUZ-BT20VG MUZ-BT25VG MUZ-BT35VG MUZ-BT50VG Power supply Single phase, 230 V, 50 Hz Cooling 2.0(0.5-2.9) 2.5(0.5-3.0) 3.5 (0.9 - 3.5) 5.0 (1.3 - 5.0) Capacity Rated (Min.- Max.) Heating 2.5(0.7-3.2) 3.15(0.7-3.5) 3.6(0.9-4.1) 5.4 (1.4 - 6.5) Breaker Capacity... - Page 7 Specifications and rated conditions of main electric parts Model MUZ-BT20VG MUZ-BT25VG MUZ-BT35VG MUZ-BT50VG Item (C61) — 600 µF/ 620 µF 420 V Smoothing (C62) 800 µF 420 V 600 µF/ 620 µF 420 V capacitor (C63) — 600 µF/ 620 µF 420 V...
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Page 8: Noise Criteria Curves
NOISE CRITERIA CURVES MUZ-BT20VG MUZ-BT25VG 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... -
Page 9: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-BT20VG MUZ-BT25VG MUZ-BT35VG Unit: mm MUZ-BT20VG MUZ-BT25/35VG only MUZ-BT25VG MUZ-BT35VG MUZ-BT50VG OBH850A... -
Page 10: Wiring Diagram
WIRING DIAGRAM MUZ-BT20VG - MUZ-BT25VG - MUZ-BT35VG - MUZ-BT20VG - MUZ-BT25VG - MUZ-BT35VG - SİGORTA 230V 50Hz GÜÇ KAYNAĞI İNVERTER BASKILI DEVRE KARTI NOTLAR : 1. İç ünite elektronik kablolaması için iç ünite elektronik kablo devre şemasını referans alınız. LED Göstergeleri ile Arıza Giderme 2. - Page 11 MUZ-BT50VG - MUZ-BT50VG - OBH850A...
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Page 12: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit: mm MUZ-BT20VG MUZ-BT25VG MUZ-BT35VG 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... - Page 13 12 m 13 m 14 m 15 m 20 m MUZ-BT20VG MUZ-BT25VG MUZ-BT35VG MUZ-BT50VG Calculation: X g = 20 g/m × (Refrigerant piping length (m) – 7) NOTE: Refrigerant piping exceeding 7 m requires additional refrigerant charge according to the calculation.
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Page 14: Performance Curves
PERFORMANCE CURVES MUZ-BT20VG MUZ-BT25VG MUZ-BT35VG MUZ-BT50VG 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 15 Total input (Cooling : at Rated frequency Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 13.7 17.3 19.8 25.0 12.7 16.0 18.3 23.1 11.6 16.7 14.6 21.2 10.6 13.3 15.2 19.3 12.0 13.7 17.3...
- Page 16 9-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-BT20VG 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 17 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-BT20VG MUZ-BT25VG (kgf/cm [Gauge])(MPa [Gauge]) (kgf/cm [Gauge])(MPa [Gauge]) Ambient temperature(°C) Ambient temperature(°C)
- Page 18 Outdoor unit current MUZ-BT50VG MUZ-BT35VG MUZ-BT20VG MUZ-BT25VG Ambient temperature(°C) Ambient temperature (°C) Ambient temperature (°C) Ambient temperature (°C) Ambient humidity(%) 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...
- Page 19 Rated frequency PERFORMANCE DATA COOL operation a MUZ-BT20VG CAPACITY: 2.0 kW SHF: 0.99 INPUT: 450 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 2.35 1.90 0.81 2.25 1.82 0.81 2.16 1.75 0.81 2.08 1.68...
- Page 20 Rated frequency PERFORMANCE DATA COOL operation a MUZ-BT20VG CAPACITY: 2.0 kW SHF: 0.99 INPUT: 450 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 1.96 1.59 0.81 1.80 1.46 0.81 1.66 1.34 0.81 2.06 1.42 0.69...
- Page 21 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-BT25VG CAPACITY: 2.5 kW SHF: 0.92 INPUT: 700 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 3.06...
- Page 22 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-BT25VG CAPACITY: 2.5 kW SHF: 0.92 INPUT: 700 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 1.49...
- Page 23 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-BT35VG CAPACITY: 3.5 kW SHF: 0.84 INPUT: 1240 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 1042 3.78 2.49 0.66 1091 3.64 2.40...
- Page 24 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-BT35VG CAPACITY: 3.5 kW SHF: 0.84 INPUT: 1240 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.43 2.26 0.66 1215 3.15 2.08 0.66 1290 2.91 1.92 0.66 1339 3.61 1.95...
- Page 25 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-BT50VG CAPACITY: 5.0 kW SHF: 0.73 INPUT: 2050 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.23 0.55 1640 5.63 3.09 0.55 1722 5.40 2.97 0.55 1804 5.20...
- Page 26 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-BT50VG CAPACITY: 5.0 kW SHF: 0.73 INPUT: 2050 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.70 0.55 2009 4.50 2.48 0.55 2132 4.15 2.28 0.55 2214 5.15 2.21...
- Page 27 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-BT20VG CAPACITY: 2.50kW INPUT: 550 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...
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Page 28: Actuator Control
ACTUATOR CONTROL MUZ-BT20VG MUZ-BT25VG MUZ-BT35VG MUZ-BT50VG 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. -
Page 29: Service Functions
SERVICE FUNCTIONS MUZ-BT20VG MUZ-BT25VG MUZ-BT35VG MUZ-BT50VG 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... -
Page 30: Troubleshooting
TROUBLESHOOTING MUZ-BT20VG MUZ-BT25VG MUZ-BT35VG MUZ-BT50VG 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 31 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 32 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 33 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 Left OPERTAION Abnormal point LED indication unit failure INDICATOR lamp Condition Remedy failure mode (Failure mode/protection) (Outdoor P.C.
- Page 34 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.). Indoor/outdoor Left OPETATION Outdoor unit Abnormal point LED indication unit failure INDICATOR lamp Condition Remedy failure mode (Failure mode/protection) (Outdoor P.C. board) mode recall (Indoor unit) recall function function 10-time blink...
- Page 35 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 36 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 37 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 38 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”. Replace the inverter P.C. board. Are the voltages balanced? Check the compressor. See 12-5.
- Page 39 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 40 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 41 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 42 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 terminal of outdoor fan motor normal? (Refer to 12-4.) Disconnect CN932 from the inverter P.C.
- Page 43 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 left OPERATION Is there voltage 230 V AC Replace the indoor INDICATOR lamp on the indoor unit between the indoor terminal electronic control P.C.
- Page 44 K Check of LEV (Expansion valve) Turn ON the power supply. <Preparation of the remote controller> While pressing both Operation select button and 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. Make sure that the indicators on the LCD screen shown in the right figure are all displayed. Then re- lease the buttons.
- Page 45 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 46 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 47 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 48 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 49 12-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-BT20VG MUZ-BT25VG MUZ-BT35VG Back side of unit Fuse (F62) Fuse (F801) 15A 250V R.V. coil/21S4 T3.15AL250V (CN721) Smoothing DB61 Fuse (F701) 230 V AC capacitor 250 V - 370 V DC T3.15AL250V...
- Page 50 1. Inverter P.C. board MUZ-BT50VG R.V.coil/21S4 Smoothing Smoothing Smoothing (CN721) DB61 Back side of unit capacitor capacitor (C61) capacitor 230 V AC 260 - 370 V DC (C62) (C63) 230 V AC Fuse (F801) Fuse (F901) Fuse (F701) T3.15AL250V T3.15AL250V T3.15AL250V Fuse (F62) Fuse (F61)
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Page 51: Disassembly Instructions
Locking lever lever. Connector 13-1. MUZ-BT20VG MUZ-BT25VG MUZ-BT35VG : Indicates the visible parts in the photos. NOTE: Turn OFF the power supply before disassembly. : Indicates the invisible parts in the photos. OPERATING PROCEDURE PHOTOS Photo 1 1. - Page 52 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. Photo 4 Screw of the heat Screw of the P.C. sink support and board Screws of the terminal board support and the separator (1) Remove the cabinet and the panels. (Refer to section 1.) block support and the the motor support (2) Disconnect the lead wire to the reactor and the follow-...
- Page 53 OPERATING PROCEDURE PHOTOS Photo 7 4. Removing the discharge temperature thermistor, the defrost thermistor, the ambient temperature thermistor and the outdoor heat exchanger tem- perature thermistor (1) Remove the cabinet and the panels. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the follow- ing connectors: <Inverter P.C.
- Page 54 OPERATING PROCEDURE PHOTOS 6. Removing the compressor and the 4-way valve Suction pipe Photo 10 brazed part R.V. coil (1) Remove the cabinet and the panels. (Refer to section 1.) (2) Remove the inverter assembly. (Refer to section 2.) (3) Remove the screws of the reactor and remove the reactor.
- Page 55 13-2. MUZ-BT50VG NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 Screws of (1) Remove the screw fixing the service panel. Screws of the top panel the top panel (2) Pull down the service panel and remove it. (3) Disconnect the power supply cord and indoor/outdoor connecting wire.
- Page 56 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 57 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 58 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued: Dec. 2019. No. OBH850 REVISED EDITION-A Published: Oct. 2019. No. OBH850 Made in Japan Specifications are subject to change without notice.
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