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OUTDOOR UNIT
SERVICE MANUAL
Models
MUFZ-KJ09NAHZ
MUFZ-KJ12NAHZ
MUFZ-KJ15NAHZ
MUFZ-KJ18NAHZ
MUFZ-KJ09NAHZ
MUFZ-KJ12NAHZ
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Revision A:
• 3. SPECIFICATION and 7-2. PERFORMANCE
CURVE has been modified.
Please void OBH753.
HFC
utilized
R410A
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U1
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U1
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U1
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U1
Indoor unit service manual
MFZ-KJ•NA Series (OBH752)
CONTENTS
1. TECHNICAL CHANGES ······························2
2. PART NAMES AND FUNCTIONS ··················3
3. SPECIFICATION ········································4
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM ·····································8
6. REFRIGERANT SYSTEM DIAGRAM ··········· 10
7. DATA······················································ 12
8. ACTUATOR CONTROL ····························· 20
9. SERVICE FUNCTIONS ······························ 21
10. TROUBLESHOOTING ······························· 22
11. DISASSEMBLY INSTRUCTIONS ················· 43
PARTS CATALOG (OBB753)
No. OBH753
REVISED EDITION-A
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Table of Contents
Related Manuals for Mitsubishi Electric MUFZ-KJ09NAHZ
Summary of Contents for Mitsubishi Electric MUFZ-KJ09NAHZ
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Page 1: Table Of Contents
CURVE has been modified. Please void OBH753. OUTDOOR UNIT No. OBH753 SERVICE MANUAL REVISED EDITION-A utilized R410A Models MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ Indoor unit service manual MFZ-KJ•NA Series (OBH752) CONTENTS 1. TECHNICAL CHANGES ······························2 2. PART NAMES AND FUNCTIONS ··················3 3. -
Page 2: Technical Changes
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to follow the instructions. Revision A: • 3. SPECIFICATION and 7-2. PERFORMANCE CURVE has been modified. TECHNICAL CHANGES MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ 1. New model... -
Page 3: Part Names And Functions
PART NAMES AND FUNCTIONS MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ Air inlet (back and side) Piping Air outlet Drain hose Drain outlet MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ Air inlet (back and side) Piping Drain hose Air outlet Drain outlet OBH753A... -
Page 4: Specification
SPECIFICATION Outdoor unit model MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ 9,000 12,000 15,000 17,000 Btu/h Cooling 1 (2,300 - 14,000) (2,300 - 15,000) (5,300 - 19,000) (5,300 - 22,500) Capacity Rated (Minimum~Maximum) 11,000 13,000 18,000 21,000 Btu/h Heating 47 1 (2,900 - 19,000) - Page 5 Test condition 3, 4 Indoor air condition (°F) Outdoor air condition (°F) Mode Test Dry bulb Wet bulb Dry bulb Wet bulb "A-2" Cooling Steady State (75) at rated compressor Speed "B-2" Cooling Steady State (65) at rated compressor Speed SEER "B-1"...
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Page 6: Outlines And Dimensions
OUTLINES AND DIMENSIONS MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ Unit: inch REQUIRED SPACE 4 in. (100 mm) or more when front and sides of the unit are clear When any 2 sides of left, right and rear of the unit are clear 2 x hole 3/8 x 13/16... - Page 7 MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ Unit: inch REQUIRED SPACE *1 20 in. (500 mm) or more when front and sides of the unit are clear 16-7/16 Air in 1-9/16 Air in Air out 2 x hole 13/32 x 13/16 6-7/8 19-11/16 *2 When any 2 sides of left, right and rear of the unit are clear 3-3/16 33-1/16...
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Page 8: Wiring Diagram
WIRING DIAGRAM MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ OBH753A... - Page 9 MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ OBH753A...
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Page 10: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ Unit: inch (mm) Refrigerant pipe ø3/8 (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 Service exchanger temperature Service port... - Page 11 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: ft. Piping size O.D: in. Model Max. Length Max. Height difference Liquid MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R410A: oz.) NOTE: Refrigerant piping exceeding 25 ft.
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Page 12: Data
DATA MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Outdoor intake air DB temperature (˚F) Model IWB (˚F) SHC TPC SHC TPC SHC TPC SHC TPC SHC TPC 11.0 0.51 10.3 0.56 0.60 0.63 0.66 MUFZ-KJ09NAHZ 10.4... - Page 13 3) HEATING CAPACITY Indoor air Outdoor intake air WB temperature (˚F) Model IDB (˚F) 0.57 0.69 0.79 0.73 10.7 0.77 11.1 0.78 12.5 0.81 MUFZ-KJ09NAHZ 0.55 0.67 0.77 0.71 11.0 0.75 11.3 0.77 12.8 0.80 0.54 0.65 0.75 10.1 0.69 11.3...
- Page 14 7-2. PERFORMANCE CURVE Cooling Cooling capacity (at Rated frequency) Indoor intake air Wet-bulb temperature( F) Outdoor intake air DB temperature(°F) MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ SHF at rating condition = 0.79 SHF at rating condition = 0.70 Airflow = 417 CFM Airflow = 417 CFM Outdoor intake air DB temperature (°F)
- Page 15 Heating MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ 120% 120% 100% 100% Outdoor Temperature Degrees (°F) Outdoor Temperature Degrees (°F) HEATING CAPACITY HEATING CAPACITY -13.0 -4.0 14.0 23.0 32.0 41.0 50.0 69.8 75.0 -13.0 -4.0 14.0 23.0 32.0 41.0 50.0 69.8 75.0 Outdoor Temperature Degrees (°F) Outdoor Temperature Degrees (°F)
- Page 16 7-3. CONDENSING PRESSURE Cooling Data are based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUFZ-KJ09NAHZ (PSIG) (PSIG) (°F) (°F) 100 105 Outdoor ambient temperature Outdoor ambient temperature MUFZ-KJ12NAHZ (PSIG) (PSIG) 100 105 (°F)
- Page 17 Heating Data are based on the condition of outdoor humidity 75%. Air flow should be set to High speed. Data are for heating operation without any frost. MUFZ-KJ09NAHZ (PSIG) (PSIG) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUFZ-KJ12NAHZ (PSIG) (PSIG) (°F)
- Page 18 MFZ-KJ18NA Power supply phase, 208/230, 1, 60 Input 0.025 0.025 0.027 0.047 Fan motor current 0.26/0.23 0.26/0.23 0.28/0.35 0.48/0.43 Outdoor unit MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ Power supply phase, 208/230, 1, 60 Input 0.545 0.725 0.865 0.875 1.093 1.376 1.303 1.687 Comp.
- Page 19 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUFZ-KJ09NAHZ 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...
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Page 20: Actuator Control
ACTUATOR CONTROL MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ 8-1. 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 21: Service Functions
SERVICE FUNCTIONS MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ 9-1. 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 10-6.1.). Defrost fi nish temperature Jumper... -
Page 22: Troubleshooting
TROUBLESHOOTING MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ 10-1. 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, then after con- firming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug. - Page 23 10-2. 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 (10-3.) disappears, the memorized failure details can be recalled. 1.
- Page 24 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 25 3. Outdoor unit failure recall mode table The 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 26 The 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) 10-time fl ash Discharge temperature Temperature of discharge temperature •...
- Page 27 10-3. 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. sor.
- Page 28 Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time fl ash Frequency drop by KJ09/12 When the input current exceeds approximately The unit is normal, but check the operates. 2.5 seconds OFF current protection 10A (KJ09)/10.5A (FH12), compressor frequency following.
- Page 29 10-4. TROUBLE CRITERION OF MAIN PARTS MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ Part name Check method and criterion Figure Defrost thermistor (RT61) Fin temperature thermistor (RT64) Measure the resistance with a tester. Ambient temperature Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C.
- Page 30 10-5. TROUBLESHOOTING FLOW A How to check inverter/compressor Disconnect the connector between the compressor and the power module (IC700) (MUFZ-KJ09/12)/ IGBT module (IC700) (MUFZ-KJ15/18). See 10-5. “Check of open phase”. Check the voltage between terminals. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor.
- Page 31 D Check of compressor winding ●Disconnect the connector between the compressor and the power module (IC700) (MUFZ-KJ09/12)/IGBT module (IC700) (MUFZ-KJ15/18), 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 32 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 10-6.1.) board.
- Page 33 H Check of R.V. coil MUFZ-KJ09/12 First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to 10-4. 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 34 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 10-4.) Disconnect CN932 from the inverter P.C.
- Page 35 J Check of power supply Disconnect the connector between the compressor and the power module (IC700) (MUFZ-KJ09/12)/IGBT module (IC700) (MUFZ-KJ15/18). Rectify indoor/outdoor Turn ON power supply and press connecting wire. EMERGENCY OPERATION switch. Does the left lamp of the Is there voltage 208/230 VAC Replace the indoor OPERATION INDICATOR lamp on between the indoor terminal...
- Page 36 K Check of LEV (Expansion valve) Turn ON the power supply. <Preparation of the remote controller> While pressing both OPERATION SELECT button and TEMP 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 37 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 10-5. .) 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 38 M How to check miswiring and serial signal error Turn OFF the power supply. Is there rated voltage in the power supply? Check the power supply. Turn ON the power supply. Is there rated voltage between the outdoor terminal block S1 and S2? Check the wiring.
- Page 39 N Check of defrost heater MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ Check the following points before checking electric continuity. 1. Does the resistance of ambient temperature thermistor have the characteristics? Refer to 10-6.1. 2. Is the resistance of defrost heater normal? Refer to 10-4.
- Page 40 P Electromagnetic noise enters into TV sets or radios Is the unit grounded? Ground the unit. Is the distance between the antennas Extend the distance between the antennas and and the indoor unit within 9.91 ft. (3m), the indoor unit, and/or the antennas and the or is the distance between the antennas outdoor unit.
- Page 41 10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ R.V.coil Smoothing (CN721) Smoothing DB61 Back side of unit Heater connector capacitor (C62) 208/230 VAC capacitor (C61) 260 - 370 VDC (CN722) Fuse (F701) Fuse (F801) 208/230 VAC T3.15AL250V...
- Page 42 MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ Fuse (F601) T3.15AL250V R.V. coil (CN602) 208/230 VAC Heater connector (CN601) 208/230 VAC 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...
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Page 43: Disassembly Instructions
Locking lever lever. Connector 11-1. MUFZ-KJ09NAHZ MUFZ-KJ12NAHZ NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 (1) Remove the screw fixing the service panel. - Page 44 OPERATING PROCEDURE PHOTOS Photo 4 Photo 5 Screws of the Screw of the conduit cover conduit plate 2. Removing the inverter assembly, inverter P.C. board Photo 6 (1) Remove the cabinet and panels. (Refer to 1.) Screws of the heat sink (2) Disconnect the lead wire to the reactor and the following support and the separator connectors:...
- Page 45 OPERATING PROCEDURE PHOTOS Screw of the 4. Removing the discharge temperature thermistor, Photo 8 R.V. coil defrost thermistor, outdoor heat exchanger tempera- ture thermistor and ambient temperature thermistor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the lead wire to the reactor and the following con- nectors: <Inverter P.C.
- Page 46 OPERATING PROCEDURE PHOTOS 5. Removing outdoor fan motor Photo 11 Screws of the outdoor fan motor (1) Remove the cabinet and panels. (Refer to 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931, CN932 (Fan motor) (3) Remove the propeller fan nut. (4) Remove the propeller fan.
- Page 47 11-2. MUFZ-KJ15NAHZ MUFZ-KJ18NAHZ NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS 1. Removing the cabinet Photo 1 Screws of the top panel (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover.
- Page 48 OPERATING PROCEDURE PHOTOS Screw of the 2. Removing the inverter assembly, inverter P.C. board Photo 5 relay panel and relay P.C. board Screws of the (1) Remove the cabinet and panels. (Refer to 1.) P.B. support Inverter P.C. Ground wires (2) Disconnect the lead wire to the reactor and the following con- board nectors:...
- Page 49 OPERATING PROCEDURE PHOTOS 4. Removing the discharge temperature thermistor, Photo 7 defrost thermistor, outdoor heat exchanger tempera- Outdoor heat exchanger Ambient temperature temperature thermistor thermistor ture thermistor and ambient 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 50 HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2016 MITSUBISHI ELECTRIC CORPORATION Distributed in Mar. 2016. No. OBH753 REVISED EDITION-A New publication, effective Mar. 2016 Distributed in Feb. 2016. No. OBH753 Specifications are subject to change without notice.
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