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OUTDOOR UNIT
SERVICE MANUAL
Models
MUFZ-KJ25VE
MUFZ-KJ35VE
MUFZ-KJ50VE
MUFZ-KJ25VE
MUFZ-KJ35VE
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
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E1
E2
ER1
ER2
ET1
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E1
E2
ER1
ER2
ET1
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E1
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ET1
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CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS ····················· 3
3. SPECIFICATION ················································ 4
4. NOISE CRITERIA CURVES ······························ 6
5. OUTLINES AND DIMENSIONS ························ 7
6. WIRING DIAGRAM ············································ 8
7. REFRIGERANT SYSTEM DIAGRAM ············· 12
8. PERFORMANCE CURVES ····························· 14
9. ACTUATOR CONTROL ··································· 25
10. SERVICE FUNCTIONS ···································· 26
11. TROUBLESHOOTING ····································· 27
12. DISASSEMBLY INSTRUCTIONS ···················· 50
PARTS CATALOG (OBB667)
Revision D:
• MUFZ-KJ25VE -
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E2
ER2
KJ35VE -
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E2
ER2
ET2
KJ50VE -
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E2
ER2
ET2
Please void OBH667 REVISED EDITION-C.
No. OBH667
HFC
REVISED EDITION-D
utilized
R410A
ET2
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ET2
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ET2
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Indoor unit service manual
MFZ-KJ•VE Series (OBH666)
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, MUFZ-
ET2
and MUFZ-
have been added.
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Table of Contents
Related Manuals for Mitsubishi Electric MFZ-KJ VE Series
Summary of Contents for Mitsubishi Electric MFZ-KJ VE Series
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Page 1: Table Of Contents
Revision D: • MUFZ-KJ25VE - , MUFZ- KJ35VE - and MUFZ- KJ50VE - have been added. Please void OBH667 REVISED EDITION-C. OUTDOOR UNIT No. OBH667 SERVICE MANUAL REVISED EDITION-D utilized R410A Models MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE Indoor unit service manual MFZ-KJ•VE Series (OBH666) CONTENTS 1. -
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
MUFZ-KJ25VE - MUFZ-KJ25VE - MUFZ-KJ35VE - MUFZ-KJ35VE - MUFZ-KJ50VE - MUFZ-KJ50VE - 1. Model name has been changed. MUFZ-KJ25VE - MUFZ-KJ25VE - MUFZ-KJ35VE - MUFZ-KJ35VE - MUFZ-KJ50VE - MUFZ-KJ50VE - 1. Model name has been changed. PART NAMES AND FUNCTIONS MUFZ-KJ25VE MUFZ-KJ35VE Air inlet... -
Page 4: Specification
SPECIFICATION Outdoor model MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (0.5 - 3.4) 3.5 (0.5 - 3.7) 5.0 (1.6 - 5.7) Capacity Rated frequency (Min.-Max.) Heating 3.4 (1.2 - 4.6) 4.3 (1.2 - 5.5) 6.0 (2.2 - 8.2) Breaker Capacity Cooling... - Page 5 Specifi cations and rated conditions of main electric parts Model MUFZ-KJ25VE MUFZ-KJ35VE Item Smoothing (C61, C62) 600 μF/ 620 μF 420 V capacitor Diode module (DB61) 15 A 600 V (F61) T20AL250V Fuse (F701, F801, F901) T3.15AL250V (IC700) 15 A 600 V Power module (IC932) 8A600V...
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Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES MUFZ-KJ25VE MUFZ-KJ35VE FUNCTION SPL(dB(A)) FUNCTION SPL(dB(A)) LINE 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... -
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: mm MUFZ-KJ25VE REQUIRED SPACE MUFZ-KJ35VE *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 and rear of the unit are clear 2 holes 10 X 21 Service panel Air out... -
Page 8: Wiring Diagram
WIRING DIAGRAM MUFZ-KJ25VE - MUFZ-KJ35VE - OBH667D... - Page 9 MUFZ-KJ25VE - MUFZ-KJ35VE - OBH667D...
- Page 10 MUFZ-KJ50VE - OBH667D...
- Page 11 MUFZ-KJ50VE - OBH667D...
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Page 12: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUFZ-KJ25VE Unit: mm MUFZ-KJ35VE Refrigerant pipe ø9.52 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature (with service port) thermistor Outdoor Muffler Discharge RT68 heat Flared connection exchanger temperature 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 9.52 6.35 MUFZ-KJ25/35 12.7 6.35 MUFZ-KJ50 Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: g) Refrigerant piping length (one way) Outdoor unit Model...
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Page 14: Performance Curves
PERFORMANCE CURVES MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE 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 10.8 12.2 11.0 Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 22.9 29.0 28.0 21.2 26.8 25.9 19.4 24.5 23.7 17.6 22.3 21.6 15.9 20.1 19.4 14.1...
- Page 16 8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUFZ-KJ25VE Correction of Heating capacity Correction of Heating input Correction of Cooling capacity Correction of Cooling 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 17 8-4. OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT 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 8-3.) Outdoor low pressure MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE (kgf/cm [Gauge])(MPa [Gauge])
- Page 18 PERFORMANCE DATA COOL operation a t Rated frequency MUFZ-KJ25VE CAPACITY: 2.5 kW SHF: 0.85 INPUT: 540 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 2.94 1.97 0.67 2.81 1.88 0.67 2.70 1.81 0.67 2.60 1.74 0.67 3.06...
- Page 19 PERFORMANCE DATA COOL operation a t Rated frequency MUFZ-KJ25VE CAPACITY: 2.5 kW SHF: 0.85 INPUT: 540 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 2.45 1.64 0.67 2.25 1.51 0.67 2.08 1.39 0.67 2.58 1.42 0.55 2.40 1.32...
- Page 20 PERFORMANCE DATA COOL operation a t Rated frequency MUFZ-KJ35VE CAPACITY: 3.5 kW SHF: 0.73 INPUT: 940 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 4.11 2.26 0.55 3.94 2.17 0.55 3.78 2.08 0.55 3.64 2.00 0.55 4.29...
- Page 21 PERFORMANCE DATA COOL operation a t Rated frequency MUFZ-KJ35VE CAPACITY: 3.5 kW SHF: 0.73 INPUT: 940 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 3.43 1.89 0.55 3.15 1.73 0.55 2.91 1.60 0.55 1015 3.61 1.55 0.43 3.36...
- Page 22 PERFORMANCE DATA COOL operation a t Rated frequency MUFZ-KJ50VE CAPACITY: 5.0 kW SHF: 0.71 INPUT: 1410 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT INPUT 5.88 3.11 0.53 1128 5.63 2.98 0.53 1184 5.40 2.86 0.53 1241 5.20...
- Page 23 PERFORMANCE DATA COOL operation a t Rated frequency MUFZ-KJ50VE CAPACITY: 5.0 kW SHF: 0.71 INPUT: 1410 W OUTDOOR DB (°C) INDOOR INDOOR DB (°C) WB (°C) INPUT INPUT INPUT 4.90 2.60 0.53 1382 4.50 2.39 0.53 1466 4.15 2.20 0.53 1523 5.15 2.11...
- Page 24 PERFORMANCE DATA HEAT operation at Rated frequency MUFZ-KJ25VE CAPACITY: 3.4 kW INPUT: 770 W OUTDOOR WB (°C) INDOOR DB (°C) INPUT INPUT INPUT INPUT INPUT INPUT INPUT 2.14 2.58 3.03 3.47 3.91 4.32 4.76 2.04 2.45 2.89 3.30 3.74 4.15 4.57 1.84 2.28...
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Page 25: Actuator Control
ACTUATOR CONTROL MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE 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 26: Service Functions
SERVICE FUNCTIONS MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE 10-1. 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 11-6-1.) Jumper wire Defrost fi nish temperature (°C) Soldered (Initial setting) None (Cut) 10-2. -
Page 27: Troubleshooting
TROUBLESHOOTING MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE 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 28 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. 1.
- Page 29 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Check if the 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 30 3. Outdoor unit failure mode table Left lamp of the 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 (Indoor unit) None (Normal) —...
- Page 31 Left lamp of the 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 (Indoor unit) • Refer to 11-5. "How 11-time fl ash Bus-bar voltage (DC) 8-time fl...
- Page 32 11-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition • Reconnect the connector of the Outdoor unit 1-time fl ash every Outdoor power sys- Overcurrent protection cut-out operates 3 consecutive times compressor. does not op- 2.5 seconds within 1 minute after the compressor gets started.
- Page 33 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 34 11-4. TROUBLE CRITERION OF MAIN PARTS MUFZ-KJ25VE MUFZ-KJ35VE MUFZ-KJ50VE Part name Check method and criterion Figure Defrost thermistor (RT61) Fin temperature thermistor (RT64) Measure the resistance with a tester. Ambient temperature Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C. thermistor (RT65) board”, for the chart of thermistor.
- Page 35 11-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700)(MUFZ-KJ25/35)/ IGBT module (IC700)(MUFZ-KJ50). Check the voltage between terminals. See 11-5. “Check of open phase”. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor.
- Page 36 D Check of compressor winding ● Disconnect the connector between the compressor and the power module (IC700)(MUFZ-KJ25/35)/ IGBT module (IC700)(MUFZ-KJ50), 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 37 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 11-6.1.) board.
- Page 38 H Check of R.V. coil MUFZ-KJ25/35 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 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 39 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 40 J Check of power supply Disconnect the connector between the compressor and the power module (IC700) (MUFZ-KJ25/35)/IGBT module (IC700) (MUFZ-KJ50). Rectify indoor/outdoor Turn ON power supply and press connecting wire. EMERGENCY OPERATION switch. Is there voltage 230 VAC Replace the indoor Does POWER lamp on the indoor between the indoor terminal electronic control P.C.
- Page 41 MFZ-KJ25VE MFZ-KJ25VE2 K Check of LEV (Expansion valve) MFZ-KJ35VE MFZ-KJ35VE2 MFZ-KJ50VE MFZ-KJ50VE2 Turn ON the power supply. <Preparation of the remote controller> While pressing both OPERATION SELECT (MODE) button and TEMP button on the remote controller at the same time, press RESET button. First, release RESET button.
- Page 42 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 11-5. .) 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 43 How to check miswiring and serial signal error MUFZ-KJ25/35 Turn OFF the power supply. Is there rated voltage in the Check the power supply. power supply? Turn ON the power supply. Is there rated voltage between Check the wiring. outdoor terminal block S1 and S2? Press EMERGENCY OPERATION switch once.
- Page 44 MUFZ-KJ50 Turn the power supply OFF. NOTE: Refer to the indoor unit service manual. 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 45 N 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 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 11-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUFZ-KJ25VE MUFZ-KJ35VE Smoothing Smoothing R.V.coil capacitor capacitor (CN721) DB61 Back side of unit (C62) (C61) 230 VAC 260 - 370 VDC Fuse (F701) T3.15AL250V Fuse (F801) 230 VAC T3.15AL250V Fuse (F901) T3.15AL250V Output to drive outdoor...
- Page 48 MUFZ-KJ50VE Fuse (F601) T3.15AL250V R.V. coil (CN602) 230VAC Heater (CN601) 230VAC Signal of out- door fan motor (CN931) LEV connector (CN724) Output to drive outdoor fan motor Defrost thermistor (CN932) /RT61 (CN671) Discharge temperature thermistor/RT62 Fuse (F901) (CN671) T3.15AL250V Outdoor heat exchanger temperature thermistor /RT68 (CN671) Ambient temperature...
- Page 49 2. Relay P.C. board MUFZ-KJ50VE CN60 To inverter P.C. board CN681 (CN680) L68B(-) 10 VDC L68A(+) OBH667D...
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Page 50: 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 51 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 (1) Remove the cabinet and 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 52 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 6 (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the following connectors: <Inverter P.C. board> Outdoor heat CN931, CN932 (Fan motor) exchanger tempera- (3) Remove the propeller fan nut. ture thermistor (4) Remove the propeller fan.
- Page 53 12-2. MUFZ-KJ50VE 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 54 OPERATING PROCEDURE PHOTOS 2. Removing the inverter assembly, inverter P.C. board Photo 3 and relay P.C. board (1) Remove the cabinet and panels. (Refer to 1.) Screws of the (2) Disconnect the lead wire to the reactor and the following con- relay panel Inverter P.C.
- Page 55 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 5 Ambient defrost thermistor, outdoor heat exchanger tempera- Outdoor heat temperature exchanger ture thermistor and ambient temperature thermistor thermistor temperature 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 56 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2013 MITSUBISHI ELECTRIC CORPORATION Distributed in Jan. 2016. No. OBH667 REVISED EDITION-D Distributed in Aug. 2014. No. OBH667 REVISED EDITION-C Distributed in Jan. 2014. No. OBH667 REVISED EDITION-B Distributed in Oct.