Table of Contents
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OUTDOOR UNIT
SERVICE MANUAL
Models
MUFZ-KJ25VEHZ
MUFZ-KJ35VEHZ
MUFZ-KJ50VEHZ
MUFZ-KJ25VEHZ
MUFZ-KJ35VEHZ
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Revision F:
• Resistance value of the defrost heater for
MUFZ-KJ25/35VEHZ -
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ER2
OBH668 REVISED EDITION-D is void.
HFC
utilized
R410A
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Indoor unit service manual
MFZ-KJ•VE Series (OBH666)
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 (OBB668)
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has been corrected (11-4.).
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No. OBH668
REVISED EDITION-E
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Table of Contents
Related Manuals for Mitsubishi Electric MUFZ-KJ25VEHZ-E1
Summary of Contents for Mitsubishi Electric MUFZ-KJ25VEHZ-E1
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Page 1: Table Of Contents
Revision F: • Resistance value of the defrost heater for MUFZ-KJ25/35VEHZ - has been corrected (11-4.). OBH668 REVISED EDITION-D is void. OUTDOOR UNIT No. OBH668 SERVICE MANUAL REVISED EDITION-E utilized R410A Models MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ MUFZ-KJ50VEHZ 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-KJ25VEHZ - MUFZ-KJ25VEHZ - MUFZ-KJ35VEHZ - MUFZ-KJ35VEHZ - MUFZ-KJ50VEHZ - MUFZ-KJ50VEHZ - 1. Model name has been changed. MUFZ-KJ25VEHZ - MUFZ-KJ25VEHZ - MUFZ-KJ35VEHZ - MUFZ-KJ35VEHZ - MUFZ-KJ50VEHZ - MUFZ-KJ50VEHZ - 1. Model name has been changed. PART NAMES AND FUNCTIONS MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ Air inlet... -
Page 4: Specification
SPECIFICATION Outdoor model MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ MUFZ-KJ50VEHZ 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 - 5.1) 4.3 (1.2 - 5.8) 6.0 (2.2 - 8.4) Breaker Capacity Cooling... - Page 5 Specifi cations and rated conditions of main electric parts Model MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ Item Smoothing 600 μF/ 620 μF 420 V (C61, C62) capacitor Diode module (DB61) 15 A 600 V (F61) T20AL250V Fuse (F701, F801, F901) T3.15AL250V Defrost heater 230 V 130 W (IC700) 15 A 600 V Power module...
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Page 6: Noise Criteria Curves
NOISE CRITERIA CURVES MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ 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 MUFZ-KJ50VEHZ Test conditions... -
Page 7: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: mm MUFZ-KJ25VEHZ REQUIRED SPACE MUFZ-KJ35VEHZ *1 100 mm or more when front and sides of the unit are clear Drain hole ø33 Air in Air in 2 holes 10 X 21 *2 When any 2 sides of left, right Service panel Air out and rear of the unit are clear... -
Page 8: Wiring Diagram
WIRING DIAGRAM MUFZ-KJ25VEHZ - MUFZ-KJ35VEHZ - OBH668E... - Page 9 MUFZ-KJ25VEHZ - MUFZ-KJ35VEHZ - OBH668E...
- Page 10 MUFZ-KJ50VEHZ - OBH668E...
- Page 11 MUFZ-KJ50VEHZ - OBH668E...
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Page 12: 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 (with service port) Outdoor Muffler RT68 Discharge 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 MUFZ-KJ25/35 9.52 6.35 MUFZ-KJ50 12.7 6.35 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-KJ25VEHZ MUFZ-KJ35VEHZ MUFZ-KJ50VEHZ 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-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) 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-KJ50VEHZ MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ (kgf/cm [Gauge])(MPa [Gauge])
- Page 18 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 0.67 3.06...
- Page 19 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 2.40 1.32...
- Page 20 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 21 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 22 PERFORMANCE DATA COOL operation a t Rated frequency MUFZ-KJ50VEHZ 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-KJ50VEHZ 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-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 1.84 2.28...
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Page 25: Actuator Control
ACTUATOR CONTROL MUFZ-KJ25VEHZ MUFZ-KJ35VEHZ MUFZ-KJ50VEHZ 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-KJ25VEHZ MUFZ-KJ35VEHZ MUFZ-KJ50VEHZ 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-KJ25VEHZ MUFZ-KJ35VEHZ MUFZ-KJ50VEHZ 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) 11-time fl ash Bus-bar voltage (DC) 8-time fl ash Bus-bar voltage of inverter cannot be •...
- Page 32 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 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-KJ25VEHZ MUFZ-KJ35VEHZ MUFZ-KJ50VEHZ 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. Replace the indoor Does the left lamp of the Is there voltage 230 VAC OPERATION INDICATOR lamp on between the indoor terminal...
- 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 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 46 P 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-KJ25VEHZ MUFZ-KJ35VEHZ Smoothing Smoothing R.V.coil Heater connector capacitor capacitor (CN721) (CN722) 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...
- Page 48 MUFZ-KJ50VEHZ 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-KJ50VEHZ CN60 To inverter P.C. board CN681 (CN680) L68B(-) 10 VDC L68A(+) OBH668E...
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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-KJ50VEHZ 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 Screws of the Screw of the (1) Remove the cabinet and panels. (Refer to 1.) relay panel P.B. support Earth wires (2) Disconnect the lead wire to the reactor and the following con- nectors: <Inverter P.C.
- Page 55 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 5 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat Ambient exchanger temperature ture thermistor and ambient temperature thermistor temperature thermistor 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 Issued: Mar. 2018. No. OBH668 REVISED EDITION-E Issued: Jan. 2016. No. OBH668 REVISED EDITION-D Issued: Aug. 2014. No. OBH668 REVISED EDITION-C Issued: Jan. 2014. No. OBH668 REVISED EDITION-B Issued: Oct.