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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-DW25VF
MUZ-DW35VF
MUZ-DW50VF
MUZ-DW25VF
MUZ-DW35VF
Revision A:
6. OUTLINES AND DIMENSIONS for MUZ-
DW25/35VF -
OBH906 is void.
-
E1
ER1
ET1
,
,
-
E1
ER1
ET1
,
,
-
E1
ER1
ET1
,
,
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 ····························· 26
11. SERVICE FUNCTIONS ······························ 27
12. TROUBLESHOOTING ······························· 28
13. DISASSEMBLY INSTRUCTIONS ················· 49
PARTS CATALOG (OBB906)
,
,
has been corrected.
E1
ER1
ET1
No. OBH906
HFC
utilized
REVISED EDITION-A
R32
Indoor unit service manual
MSZ-DW∙VF Series (OBH905)
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Table of Contents
Related Manuals for Mitsubishi Electric MUZ-DW25VF-E1
Summary of Contents for Mitsubishi Electric MUZ-DW25VF-E1
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Page 1: Table Of Contents
Revision A: 6. OUTLINES AND DIMENSIONS for MUZ- DW25/35VF - has been corrected. OBH906 is void. OUTDOOR UNIT No. OBH906 utilized REVISED EDITION-A SERVICE MANUAL Models MUZ-DW25VF MUZ-DW35VF MUZ-DW50VF Indoor unit service manual MSZ-DW∙VF Series (OBH905) CONTENTS 1. TECHNICAL CHANGES ······························2 2. -
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-DW25VF MUZ-DW35VF Air inlet (back and side) Piping Drain hose Air outlet Drain outlet MUZ-DW50VF Air inlet (back and side) Piping Air outlet Drain hose Drain outlet ACCESSORIES MUZ-DW25VF MODELS MUZ-DW35VF MUZ-DW50VF Drain socket OBH906A... -
Page 6: Specification
SPECIFICATION Outdoor model MUZ-DW25VF MUZ-DW35VF MUZ-DW50VF Power supply Single phase, 230 V, 50 Hz Cooling 2.5(0.5-2.9) 3.4(0.9-3.4) 5.0(1.3-5.0) Capacity Rated (Min.- Max.) 3.15(0.7-3.5) 3.6(0.9-3.7) 5.4(1.4-6.5) Heating Breaker Capacity Cooling 1,210 2,050 Power input *1 (Set) Heating 1,550 Cooling Running current *1 (Set) Heating Cooling Power factor *1 (Set) - Page 7 Specifications and rated conditions of main electric parts Model MUZ-DW25VF MUZ-DW35VF MUZ-DW50VF Item (C61) — 600/620 µF 420 V Smoothing (C62) 800 µF 420 V 600/620 µF 420 V capacitor (C63) — 600/620 µF 420 V (DB61) 15 A 600 V 25 A 600 V Diode module (DB65)
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Page 8: Noise Criteria Curves
NOISE CRITERIA CURVES MUZ-DW25VF MUZ-DW35VF 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 MUZ-DW50VF FUNCTION SPL(dB(A)) -
Page 9: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUZ-DW25VF MUZ-DW35VF Unit: mm MUZ-DW25VF MUZ-DW35VF only MUZ-DW35VF MUZ-DW50VF OBH906A... -
Page 10: Wiring Diagram
WIRING DIAGRAM MUZ-DW25VF - MUZ-DW35VF - MUZ-DW25VF - MUZ-DW35VF - SİGORTA 230V 50Hz GÜÇ KAYNAĞI İNVERTER BASKILI DEVRE KARTI NOTLAR : 1. İç ünite elektronik kablolaması için iç ünite elektronik kablo devre şemasını referans alınız. 2. Sadece bakır besleme kablosu kullanın. 3. - Page 11 MUZ-DW50VF - MUZ-DW50VF - İNVERTER SİGORTA 230V 50Hz BASKILI GÜÇ DEVRE KARTI KAYNAĞI NOTLAR : 1. İç ünite elektronik kablolaması için iç ünite elektronik kablo devre şemasını referans alınız. 2. Sadece bakır besleme kablosu kullanın. 3. Sembolleri gösterir. :Terminal bloğu :Konnektör SEMBOL PARÇA ADI...
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Page 12: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit: mm MUZ-DW25VF MUZ-DW35VF Refrigerant pipe ø9.52 4-way valve (with heat insulator) Muffler Outdoor heat exchanger temperature Stop valve thermistor (with service port) Outdoor Muffler RT68 Discharge heat Flared connection temperature exchanger thermistor RT62 Ambient Compressor temperature thermistor RT65 Defrost... - Page 13 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-DW25VF MUZ-DW35VF 9.52 6.35 MUZ-DW50VF 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 14: Performance Curves
PERFORMANCE CURVES MUZ-DW25VF MUZ-DW35VF MUZ-DW50VF 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) 20.0 22.0 28.0 18.5 20.3 25.9 16.9 18.6 23.7 15.4 16.9 21.6 13.8 15.2 19.4 12.3 13.5 17.2 10.8...
- Page 16 9-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-DW25VF Correction of Cooling capacity Correction of Heating input Correction of Cooling input Correction of Heating capacity 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 17 9-3. HOW TO OPERATE FIXED-FREQUENCY OPERATION <Test run operation> 1. Press the 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 18 Outdoor unit current MUZ-DW50VF MUZ-DW25VF MUZ-DW35VF 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-DW25VF MUZ-DW35VF...
- Page 19 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-DW25VF CAPACITY: 2.5 kW SHF: 0.86 INPUT: 800 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 2.94 2.00 0.68 2.81 1.91 0.68 2.70 1.84 0.68 2.60 1.77 0.68 3.06...
- Page 20 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-DW25VF CAPACITY: 2.5 kW SHF: 0.86 INPUT: 800 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 2.45 1.67 0.68 2.25 1.53 0.68 2.08 1.41 0.68 2.58 1.44 0.56 2.40 1.34...
- Page 21 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-DW35VF CAPACITY: 3.4 kW SHF: 0.78 INPUT: 1210 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.00 2.40 0.60 3.83 2.30 0.60 1016 3.67 2.20 0.60 1065 3.54 2.12...
- Page 22 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-DW35VF CAPACITY: 3.4 kW SHF: 0.78 INPUT: 1210 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.33 2.00 0.60 1186 3.06 1.84 0.60 1258 2.82 1.69 0.60 1307 3.50 1.68...
- Page 23 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-DW50VF CAPACITY: 5.0 kW SHF: 0.7 INPUT: 2050 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.06 0.52 1640 5.63 2.93 0.52 1722 5.40 2.81 0.52 1804 5.20...
- Page 24 t Rated frequency PERFORMANCE DATA COOL operation a MUZ-DW50VF CAPACITY: 5.0 kW SHF: 0.7 INPUT: 2050 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.55 0.52 2009 4.50 2.34 0.52 2132 4.15 2.16 0.52 2214 5.15 2.06...
- Page 25 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-DW25VF CAPACITY: 3.15kW INPUT: 850 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 1.98 2.39 2.80 3.21 3.62 4.00 4.41 1.89 2.27 2.68 3.06 3.47 3.84 4.24 1.70 2.11 2.49...
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Page 26: Actuator Control
ACTUATOR CONTROL MUZ-DW25VF MUZ-DW35VF MUZ-DW50VF 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 27: Service Functions
SERVICE FUNCTIONS MUZ-DW25VF MUZ-DW35VF MUZ-DW50VF 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 Soldered (Initial setting) None (Cut) 11-2. -
Page 28: Troubleshooting
TROUBLESHOOTING MUZ-DW25VF MUZ-DW35VF MUZ-DW50VF 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 29 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 30 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 31 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 Upper OPERATION Abnormal point LED indication unit failure INDICATOR lamp Condition Remedy failure mode (Failure mode/protection) (Outdoor P.C.
- Page 32 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (12-3.). Indoor/outdoor Upper OPERATION 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 33 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 2.5 seconds within 1 minute after the compressor gets started. sor.
- Page 34 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 35 12-4. TROUBLESHOOTING CRITERION OF MAIN PARTS Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a multimeter. 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 36 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 37 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 38 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 39 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 40 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 41 J Check of power supply Disconnect the connector between the compressor and the power module (IC700). Turn ON power supply and Rectify indoor/outdoor press the emergency operation switch. connecting wire. Does the upper OPERATION Is there voltage 230 V AC Replace the indoor electronic control P.C.
- Page 42 K Check of LEV (Expansion valve) Turn ON the power supply. <Preparation of the remote controller> While pressing both Operation select button and TOO COOL 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 43 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 44 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. • Turn OFF inverter-controlled lighting equipment. • Turn OFF the power supply and then turn ON again. •...
- Page 45 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 46 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 47 12-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-DW25VF MUZ-DW35VF Back side of unit R.V. coil/21S4 Fuse (F901) (CN721) Smoothing Fuse (F801) DB61 T3.15AL250V 230 V AC capacitor (C62) T3.15AL250V Fuse (F701) 250 V - 370 V DC T3.15AL250V Fuse (F62) Fuse (F61)
- Page 48 1. Inverter P.C. board MUZ-DW50VF Smoothing Smoothing Smoothing R.V.coil Back side of unit capacitor capacitor capacitor (CN721) (C61) (C62) (C63) 230 V AC DB61 230 V AC 260 - 370 V DC Fuse (F701) Fuse (F801) T3.15AL250V T3.15AL250V Fuse (F62) 15 A 250V Output to drive compressor...
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Page 49: 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 50 OPERATING PROCEDURE PHOTOS/FIGURES 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 51 OPERATING PROCEDURE PHOTOS/FIGURES 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 52 OPERATING PROCEDURE PHOTOS/FIGURES 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 53 13-2. MUZ-DW50VF NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES Screws of 1. Removing the cabinet Photo 1 the top panel (1) Remove the screws fixing the service panel. Screws of the top panel (2) Pull down the service panel and remove it. (3) Disconnect the power supply and indoor/outdoor con- Back panel necting wire.
- Page 54 OPERATING PROCEDURE PHOTOS/FIGURES 2. Removing the inverter assembly and inverter P.C. Photo 4 Screw of the P.B. support and the separator board (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 con- the terminal block support and the separator nectors:...
- Page 55 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 56 Brazed parts of 4-way valve temperature thermistor HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2021 MITSUBISHI ELECTRIC CORPORATION Issued: Dec. 2021. No. OBH906 REVISED EDITION-A Published: Oct. 2021. No. OBH906 Made in Japan Specifications are subject to change without notice.