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SPLIT-TYPE AIR CONDITIONERS
OUTDOOR UNIT
SERVICE MANUAL
Models
MUFZ-KJ25VEHZ
MUFZ-KJ35VEHZ
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
HFC
utilized
R410A
-
E1
-
E1
Indoor unit service manual
MFZ-KJ•VE Series (OBH666)
CONTENTS
1. TECHNICAL CHANGES ··································· 3
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 ··············· 9
8. PERFORMANCE CURVES ····························· 10
9. ACTUATOR CONTROL ··································· 19
10. SERVICE FUNCTIONS ···································· 20
11. TROUBLESHOOTING ····································· 21
12. DISASSEMBLY INSTRUCTIONS ···················· 39
PARTS CATALOG (OBB668)
No. OBH668
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Related Manuals for Mitsubishi Electric MUFZ-KJ25VEHZ
Summary of Contents for Mitsubishi Electric MUFZ-KJ25VEHZ
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Page 1: Table Of Contents
SPLIT-TYPE AIR CONDITIONERS OUTDOOR UNIT No. OBH668 SERVICE MANUAL utilized R410A Models MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ Indoor unit service manual MFZ-KJ•VE Series (OBH666) CONTENTS 1. TECHNICAL CHANGES ··································· 3 2. PART NAMES AND FUNCTIONS ····················· 3 3. SPECIFICATION ················································ 4 4. NOISE CRITERIA CURVES ······························ 6 5. - Page 2 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.
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Page 3: Technical Changes
TECHNICAL CHANGES MUFZ-KJ25VEHZ - MUFZ-KJ35VEHZ - 1. New model PART NAMES AND FUNCTIONS MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ Air inlet (back and side) Piping Drain hose Air outlet Drain outlet OBH668... -
Page 4: Specification
SPECIFICATION Outdoor model MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ Power supply Single phase, 230 V, 50 Hz Cooling 2.5 (0.5 - 3.4) 3.5 (0.5 - 3.7) Capacity Rated frequency (Min.-Max.) Heating 3.4 (1.2 - 5.1) 4.3 (1.2 - 5.8) Breaker Capacity Cooling Power input 1 (Total) - Page 5 Specifi cations and rated conditions of main electric parts Model MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ 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 Defrost heater 230 V 130 W...
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Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ 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... -
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUFZ-KJ25VEHZ Unit: mm REQUIRED SPACE MUFZ-KJ35VEHZ 100 mm or more Drain hole ø33 Air in Air in 2 holes 10 X 21 Service panel Air out 22.3 Liquid refrigerant pipe joint Handle Refrigerant pipe (flared) ø6.35 Gas refrigerant pipe joint Refrigerant pipe (flared) ø9.52... -
Page 8: Wiring Diagram
WIRING DIAGRAM MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ OBH668... -
Page 9: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Unit: mm MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ Refrigerant pipe ø9.52 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve temperature thermistor Outdoor Muffler RT68 Discharge heat Flared connection exchanger temperature thermistor RT62 Ambient Compressor temperature thermistor RT65 Defrost... -
Page 10: Performance Curves
PERFORMANCE CURVES MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ 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 11 Total input (Cooling : at Rated frequency 10.8 Indoor intake air Wet-bulb temperature( ) Outdoor intake air Dry-bulb temperature (°C) Heating capacity (at Rated frequency) 22.9 29.0 21.2 26.8 19.4 24.5 17.6 22.3 15.9 20.1 14.1 17.8 12.3 15.6 10.6 13.4 11.1 Outdoor intake air Wet-bulb temperature (°C)
- Page 12 8-2. CAPACITY AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUFZ-KJ25VEHZ 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 13 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-KJ25VEHZ MUFZ-KJ35VEHZ (kgf/cm [Gauge])(MPa [Gauge]) (kgf/cm [Gauge])(MPa [Gauge]) Ambient temperature(°C) Ambient temperature(°C)
- Page 14 PERFORMANCE DATA COOL operation a t Rated frequency MUFZ-KJ25VEHZ 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...
- Page 15 PERFORMANCE DATA COOL operation a t Rated frequency MUFZ-KJ25VEHZ 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...
- Page 16 PERFORMANCE DATA COOL operation a t Rated frequency MUFZ-KJ35VEHZ 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 17 PERFORMANCE DATA COOL operation a t Rated frequency MUFZ-KJ35VEHZ 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 18 PERFORMANCE DATA HEAT operation at Rated frequency MUFZ-KJ25VEHZ 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...
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Page 19: Actuator Control
ACTUATOR CONTROL MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ 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. -
Page 20: Service Functions
SERVICE FUNCTIONS MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ 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) -
Page 21: Troubleshooting
TROUBLESHOOTING MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ 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 22 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 23 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Confi rm if outdoor unit is abnormal according to the following procedures. Confi rm that the remote controller is in the failure mode recall function. 1.
- Page 24 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 25 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 the connector of the does not op- 2.5 seconds within 1 minute after the compressor gets started. compressor.
- Page 26 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 27 11-4. TROUBLE CRITERION OF MAIN PARTS MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ 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.
- Page 28 11-5. 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 11-5. “Check of open phase”. Replace the inverter P.C. board. Are the voltages balanced? Check the compressor. See 11-5.
- 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>>...
- Page 30 G Check of outdoor thermistors Disconnect the connector of thermistor in the outdoor 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 31 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 32 J Check of power supply Disconnect the connector between the compressor and the power module (IC700). Rectify indoor/outdoor Turn ON power supply and press EMERGENCY OPERATION switch. connecting wire. Does the left lamp of the Is there voltage 230 VAC Replace the indoor OPERATION INDICATOR lamp on between the indoor terminal...
- Page 33 K Check of LEV (Expansion valve) 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. Hold down the other two buttons for another 3 sec- onds.
- Page 34 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 35 M 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? 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 36 N 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 37 O Check of defrost heater Check the following points before checking electric continuity. 1. Does the resistance of ambient temperature thermistor have the characteristics? Refer to 11-6.1. 2. Is the resistance of defrost heater normal? Refer to 11-4. 3. Does the heater protector remain conducted (not open)? 4.
- Page 38 11-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ Smoothing Smoothing R.V.coil Heater connector capacitor capacitor (CN721) DB61 (CN722) Back side of unit (C62) (C61) 230 VAC 260 - 370 VDC Fuse (F701) T3.15AL250V Fuse (F801) 230 VAC T3.15AL250V...
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Page 39: Disassembly Instructions
Pull the terminal while pull out the terminal pushing the locking slowly. Locking lever lever. Connector 12-1. MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ NOTE: Turn OFF power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screw fixing the service panel. - Page 40 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 41 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 nut. ture thermistor (4) Remove the propeller.
- Page 42 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2013 MITSUBISHI ELECTRIC CORPORATION New publication, effective Jun. 2013 Distributed in Jun. 2013. No. OBH668 Specifications are subject to change without notice. Made in Japan...