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Mitsubishi Electric MUZ-DM50VA-ER1 Service Manual
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Mitsubishi Electric MUZ-DM50VA-ER1 Service Manual

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OUTDOOR UNIT
SERVICE MANUAL
Models
MUZ-DM50VA
MUZ-DM60VA
MUZ-DM71VA
MUZ-DM50VA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
-
ER1
-
ER1
-
ER1
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. NOISE CRITERIA CURVES ··························6
5. OUTLINES AND DIMENSIONS ·····················8
6. WIRING DIAGRAM ·····································9
7. REFRIGERANT SYSTEM DIAGRAM ··········· 10
8. PERFORMANCE CURVES ························ 12
9. ACTUATOR CONTROL ····························· 24
10. SERVICE FUNCTIONS ······························ 25
11. TROUBLESHOOTING ······························· 26
12. DISASSEMBLY INSTRUCTIONS ················· 44
PARTS CATALOG (OBB781)
Revision A:
• "6. WIRING DIAGRAM" has been corrected.
Please void OBH781.
No. OBH781
HFC
utilized
REVISED EDITION-A
R410A
Indoor unit service manual
MSZ-DM•VA Series (OBH780)

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Summary of Contents for Mitsubishi Electric MUZ-DM50VA-ER1

  • Page 1: Table Of Contents

    Revision A: • "6. WIRING DIAGRAM" has been corrected. Please void OBH781. OUTDOOR UNIT No. OBH781 utilized REVISED EDITION-A SERVICE MANUAL R410A Models MUZ-DM50VA MUZ-DM60VA MUZ-DM71VA Indoor unit service manual MSZ-DM•VA Series (OBH780) CONTENTS 1. TECHNICAL CHANGES ······························2 2. PART NAMES AND FUNCTIONS ··················3 3.

  • 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: Part Names And Functions

    PART NAMES AND FUNCTIONS MUZ-DM50VA Air inlet (Back and side) Piping Drain hose Air outlet Drain outlet MUZ-DM60VA MUZ-DM71VA Air inlet (back and side) Piping Drain hose Air outlet Drain outlet ACCESSORIES Drain socket OBH781A...

  • Page 4: Specification

    SPECIFICATION Outdoor model MUZ-DM50VA MUZ-DM60VA MUZ-DM71VA Power supply Single phase, 230 V, 50 Hz Cooling 5.0 (1.3 - 5.0) 6.1 (1.7-7.1) 7.1 (1.8-7.1) Capacity Rated frequency (Min.-Max.) Heating 5.4 (1.4 - 6.5) 6.8 (1.5-8.4) 8.1 (1.5-8.5) Breaker Capacity Cooling 2,050 1,900 2,330 Power input 1 (Set)
  • Page 5 Specifi cations and rated conditions of main electric parts Model MUZ-DM50VA MUZ-DM60VA MUZ-DM71VA Item 600 μF/ 620 μF 420 V Smoothing capacitor (C61, C62, C63) Diode module (DB61) 15 A 600 V 25 A 600 V (F61) T20AL250V Fuse (F701, F801, F901) T3.15AL250V (IC700) 20 A 600 V...

  • Page 6: Noise Criteria Curves

    NOISE CRITERIA CURVES MUZ-DM50VA Test conditions FUNCTION SPL(dB(A)) LINE Cooling : Dry-bulb temperature 35°C Heating : Dry-bulb temperature 7°C Wet-bulb temperature 6°C COOLING HEATING OUTDOOR UNIT MICROPHONE NC-70 NC-60 NC-50 NC-40 NC-30 NC-20 NC-10 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz OBH781A...
  • Page 7 MUZ-DM60VA MUZ-DM71VA 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 Heating: Dry-bulb temperature 7°C Wet-bulb temperature 6°C...

  • Page 8: Outlines And Dimensions

    OUTLINES AND DIMENSIONS REQUIRED SPACE MUZ-DM50VA *1 100 mm or more when front and sides of the unit are clear Drain hole ø42 Air in Air in *2 When any 2 sides of left, right 2 - 10 X 21 Oval hole and rear of the unit are clear Air out Service panel...

  • Page 9: Wiring Diagram

    WIRING DIAGRAM MUZ-DM50VA MUZ-DM60VA MUZ-DM71VA OBH781A...

  • Page 10: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MUZ-DM50VA Unit : mm 4-way valve Refrigerant pipe ø12.7 (with heat insulator) Muffler Outdoor heat Stop valve exchanger temperature (with service port) Outdoor thermistor Muffler Discharge heat Flared connection RT68 exchanger temperature thermistor RT62 Compressor Defrost thermistor RT61 Capillary tube ø...
  • Page 11 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: m Piping size O.D: mm Model Max. Length Max. Height difference Liquid MUZ-DM50VA 12.7 6.35 MUZ-DM60VA 15.88 MUZ-DM71VA 9.52 Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A : g) Refrigerant piping length (one way) Outdoor unit Model...

  • Page 12: Performance Curves

    PERFORMANCE CURVES MUZ-DM50VA MUZ-DM60VA MUZ-DM71VA 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 13 8-1. CAPACITY AND INPUT CURVES MUZ-DM50VA MUZ-DM60VA MUZ-DM71VA Cooling capacity (at Rated frequency) 11.4 10.4 10.5 Outdoor intake air Dry-bulb temperature (°C) Total input (Cooling :at Rated frequency) Outdoor intake air Dry-bulb temperature (°C) Heating capacity Total input (at Rated frequency) (Heating at Rated frequency) 24.7 22.6...
  • Page 14 8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-DM50VA Correction of Cooling capacity Correction of Cooling total input Correction of Heating total input Correction of Heating capacity (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ-DM60VA...
  • Page 15 8-3. 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 16 Outdoor unit current MUZ-DM50VA MUZ-DM60VA MUZ-DM71VA (°C) (°C) (°C) 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 8-3.) Outdoor unit current...
  • Page 17 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-DM50VA CAPACITY: 5.0 kW SHF: 0.70 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 18 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-DM50VA CAPACITY: 5.0 kW SHF: 0.70 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 19 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-DM60VA CAPACITY: 6.1 kW SHF: 0.82 INPUT: 1900 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 7.17 4.59 0.64 1520 6.86 4.39 0.64 1596 6.59 4.22 0.64 1672 6.34...
  • Page 20 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-DM60VA CAPACITY: 6.1 kW SHF: 0.82 INPUT: 1900 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 5.98 3.83 0.64 1862 5.49 3.51 0.64 1976 5.06 3.24 0.64 2052 6.28 3.27...
  • Page 21 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-DM71VA CAPACITY: 7.1 kW SHF: 0.77 INPUT: 2330 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 8.34 4.92 0.59 1864 7.99 4.71 0.59 1957 7.67 4.52 0.59 2050 7.38...
  • Page 22 PERFORMANCE DATA COOL operation a t Rated frequency MUZ-DM71VA CAPACITY: 7.1 kW SHF: 0.77 INPUT: 2330 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 6.96 4.11 0.59 2283 6.39 3.77 0.59 2423 5.89 3.48 0.59 2516 7.31 3.44...
  • Page 23 PERFORMANCE DATA HEAT operation at Rated frequency MUZ-DM50VA CAPACITY: 5.4 kW INPUT: 1480 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 3.40 4.10 1154 4.81 1302 5.51 1406 6.21 1495 6.86 1539 7.56 1569 3.24 1036 3.89...

  • Page 24: Actuator Control

    ACTUATOR CONTROL MUZ-DM50VA MUZ-DM60VA MUZ-DM71VA 9-1. 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 25: Service Functions

    SERVICE FUNCTIONS MUZ-DM50VA MUZ-DM60VA MUZ-DM71VA 10-1. CHANGE IN DEFROST SETTING <JS> When the JS wire of the inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to 11-6-1.) Defrost fi nish temperature (°C) Jumper wire MUZ-DM50VA MUZ-DM60/71VA Soldered (Initial setting)

  • Page 26: Troubleshooting

    TROUBLESHOOTING MUZ-DM50VA MUZ-DM60VA MUZ-DM71VA 11-1. 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 27 11-2. 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 (11-3.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which does not recur.
  • Page 28 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 29 NOTE: Blinking patterns of this mode differ from the ones of 3. Table of outdoor unit failure mode recall function TROUBLESHOOTING CHECK TABLE (11-3.). The upper lamp of Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR (Failure mode/protection)
  • Page 30 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (11-3.). The upper lamp of Indoor/outdoor Outdoor unit OPERATION Abnormal point LED indication unit failure Condition Remedy failure mode INDICATOR (Failure mode/protection) (Outdoor P.C. board) mode recall recall function lamp function...
  • Page 31 11-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition 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, or failure of sor.
  • Page 32 Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 7-time fl ash Low discharge tem- Temperature of discharge temperature thermistor has been • Refer to 11-5. "Check of LEV". operates. 2.5 seconds OFF perature protection 50°C or less for 20 minutes. •...
  • Page 33 11-4. TROUBLE CRITERION OF MAIN PARTS Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a tester. Outdoor heat exchanger Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for temperature thermistor the chart of thermistor.
  • Page 34 11-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector (CN61) between compressor and the power module (IC700). See 11-5. “Check of open phase”. Check the voltage between terminals. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. See 11-5.
  • Page 35 C Check of compressor Refer to 11-5. “Check of compressor winding”. Replace the compressor. Is the compressor normal? Refer to 11-5. “Check of compressor operation time”. Refer to 11-5. “Check of compressor start failure”. Does the compressor operate continuously? D Check of compressor winding ●...
  • Page 36 F Check of compressor start failure Make sure that is normal. •Electrical circuit check . Contact of the compressor connector (Including CN61) . Output voltage of inverter P.C. board and balance of them (See 11-5. ) . Direct current voltage between DB61(+) and (-) on the inverter P.C. board .
  • Page 37 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 11-4. In case CN721 is not connected or R.V. coil is open, voltage is generated between the terminal pins of the connector although any signal is not being transmitted to R.V.
  • Page 38 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 11-4.) Disconnect CN932 from the inverter P.C.
  • Page 39 250 - 370 V DC J Check of power supply Disconnect the connector (CN61) DB61 between compressor and power module. Turn ON power supply and press Rectify indoor/outdoor connecting wire. EMERGENCY OPERATION switch. Inverter P.C. board (Solder side) Is there voltage 230 V AC Replace the indoor Does the upper lamp of OPERATION between the indoor terminal...
  • Page 40 L How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the Check the power supply. power supply? 1. Turn ON the power supply. 2. Press the emergency operation switch. Has the relay 52C been turned on 3 minuets later ? [The relay will be turned on in 3 to 7 seconds by bridging the timer short mode point (Refer to the indoor unit service manual.).] Initializing the determination of the power...
  • Page 41 M Check of 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 42 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 43 11-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board Smoothing Smoothing Smoothing R.V.coil capacitor capacitor capacitor (CN721) DB61 Back side of unit (C63) (C62) (C61) 230 V AC 250 - 370 V DC Fuse (F701) T3.15AL250V Fuse (F801) 230 V AC T3.15AL250V Fuse (F901) T3.15AL250V...

  • Page 44: 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 45 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the cabinet and the panels. (Refer to 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 46 OPERATING PROCEDURE PHOTOS 5. Removing the outdoor fan motor Photo 6 (1) Remove the cabinet and the panels. (Refer to 1.) (2) Disconnect the following connectors: <Inverter P.C. board> Outdoor heat CN931, CN932 (Fan motor) exchanger tempera- (3) Remove the fan motor lead wire from where it is fastened on ture thermistor the separator.
  • Page 47 12-3. MUZ-DM60VA MUZ-DM71VA NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. Screws of the top panel (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
  • Page 48 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 Screws of the terminal (1) Remove the cabinet and panels. (Refer to 1.) Screw of the heat sink block support and the (2) Disconnect the lead wire to the reactor and the following con- support and the separator back panel nectors:...
  • Page 49 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 6 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat ture thermistor exchanger tempera- ture thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
  • Page 50 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2017 MITSUBISHI ELECTRIC CORPORATION Issued: Aug. 2017. No. OBH781 REVISED EDITION-A Published: Jul. 2017. No. OBH781 Made in Japan Specifications are subject to change without notice.

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Muz-dm60va-er1Muz-dm71va-er1

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