Mitsubishi Electric MUZ-FX06NLHZ-U1 Technical & Service Manual
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Mitsubishi Electric MUZ-FX06NLHZ-U1 Technical & Service Manual

Mitsubishi Electric MUZ-FX06NLHZ-U1 Technical & Service Manual

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OUTDOOR UNIT
TECHNICAL &
SERVICE MANUAL
Models
MUZ-FX06NLHZ
MUZ-FX09NLHZ
MUZ-FX12NLHZ
MUZ-FX15NLHZ
MUZ-FX18NLHZ
MUZ-FX24NLHZ
MUZ-FX06NLHZ
MUZ-FX09NLHZ
MUZ-FX12NLHZ
Revision A:
• 3. SPECIFICATION has been corrected.
OBD946 is void.
HFC
utilized
R454B
-
U1
-
U1
-
U1
Indoor unit technical & service manual
-
U1
MSZ-FX•NL Series (OBD945)
Indoor unit service manual
-
U1
MSZ-FX•NL Series (OBH945)
Outdoor unit service manual
-
U1
MUZ-FX•NLZ/NLHZ Series (OBH946)
CONTENTS
USING REFRIGERANT R454B ····················· 3
1. TECHNICAL CHANGES ······························ 8
2. PART NAMES AND FUNCTIONS ·················· 9
3. SPECIFICATION ·······································10
4. OUTLINES AND DIMENSIONS ····················13
5. WIRING DIAGRAM ····································15
6. REFRIGERANT SYSTEM DIAGRAM ············16
7. DATA ·······················································18
8. ACTUATOR CONTROL ······························35
9. SERVICE FUNCTIONS ·······························36
10. TROUBLESHOOTING ································37
11. DISASSEMBLY INSTRUCTIONS ··················62
13. NOISE CRITERION CURVES ·······················74
IN LOW AMBIENT TEMPERATURE ··············76
15. PERFORMANCE CHART ····························79
FOR PIPING LENGTH ································91
17. PART LOAD CAPACITY CHART ··················92
No. OBD946
REVISED EDITION-A
· ····
73

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Summary of Contents for Mitsubishi Electric MUZ-FX06NLHZ-U1

  • Page 1: Table Of Contents

    Revision A: • 3. SPECIFICATION has been corrected. OBD946 is void. OUTDOOR UNIT No. OBD946 TECHNICAL & utilized REVISED EDITION-A SERVICE MANUAL R454B Models MUZ-FX06NLHZ MUZ-FX09NLHZ MUZ-FX12NLHZ MUZ-FX15NLHZ Indoor unit technical & service manual MSZ-FX•NL Series (OBD945) MUZ-FX18NLHZ Indoor unit service manual MSZ-FX•NL Series (OBH945) MUZ-FX24NLHZ Outdoor unit service manual...
  • Page 2 Use the specified 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: Servicing Precautions For Units Using Refrigerant R454B

    SERVICING PRECAUTIONS FOR UNITS USING REFRIGERANT R454B Servicing precautions for units using refrigerant R454B Refrigerant WARNING Safety Group This unit uses a flammable refrigerant. If refrigerant leaks and comes in contact with fire or heating part, it will create harmful gas and there is risk of fire. Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer.

  • Page 4: Additional Refrigerant Charge

    2. Additional refrigerant charge Additional refrigerant charge Refrigerant for the indoor units and the extended piping is not included in the outdoor unit when the unit is shipped from the factory. Therefore, charge each refrigerant piping system with additional refrigerant at the installation site. In addition, in order to carry out service, enter the size and length of each liquid pipe and additional refrigerant charge amounts in the spaces pro- vided on the “Refrigerant amount”...
  • Page 5 4. Cautions for the unit using R454B refrigerant Basic work procedures are the same as those for conventional units using refrigerant R410A. However, pay careful attention to the following points. ■ Information on servicing 1. Checks to the area Prior to beginning work on systems containing FLAMMABLE REFRIGERANTS, safety checks are necessary to ensure that the risk of ignition is minimized.
  • Page 6 ■ Repairs to sealed components Sealed electrical components shall be replaced. ■ Repair to intrinsically safe components Intrinsically safe components must be replaced. ■ Cabling Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental effects.
  • Page 7 ■ Decommissioning Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its detail. It is recommended good practice that all refrigerants are recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall be taken in case analysis is required prior to re-use of recovered refrigerant.

  • Page 8: Technical Changes

    TECHNICAL CHANGES MUZ-FX06NLHZ - MUZ-FX09NLHZ - MUZ-FX12NLHZ - MUZ-FX15NLHZ - MUZ-FX18NLHZ - MUZ-FX24NLHZ - 1. New model OBD946_8...

  • Page 9: Part Names And Functions

    PART NAMES AND FUNCTIONS MUZ-FX06NLHZ MUZ-FX09NLHZ MUZ-FX12NLHZ Air inlet (Back and side) Piping Air outlet Drain hose Drain outlet MUZ-FX15NLHZ MUZ-FX18NLHZ MUZ-FX24NLHZ Air inlet (Back and side) Piping Air outlet Drain hose Drain outlet OBD946_9...

  • Page 10: Specification

    SPECIFICATION Outdoor unit model MUZ-FX06NLHZ MUZ-FX09NLHZ MUZ-FX12NLHZ Cooling * Btu/h 6,000 (1,700 – 14,000) 9,000 (2,500 – 15,000) 12,000 (2,500 – 16,100) Capacity Rated (Minimum – Maximum) Heating 47 * Btu/h 9,000 (1,700 – 20,000) 12,000 (3,100 – 21,300) 13,200 (3,100 – 23,500) Capacity Heating 17 * Btu/h...
  • Page 11 Outdoor unit model MUZ-FX15NLHZ MUZ-FX18NLHZ MUZ-FX24NLHZ Cooling * Btu/h 15,000 (3,700 – 19,100) 17,200 (3,700 – 21,500) 20,800 (2,500 – 26,500) Capacity Rated (Minimum – Maximum) Heating 47 * Btu/h 16,500 (5,150 – 28,400) 17,000 (5,150 – 30,200) 19,800 (5,500 – 36,200) Capacity Heating 17 * Btu/h...

  • Page 12: Test Condition

    Test condition *3, *4 AHRI Indoor air condition (°F) Outdoor air condition (°F) Mode Test 210/240 Dry bulb Wet bulb Dry bulb Wet bulb “A-Full” Cooling Steady State at rated compressor speed “B-Full” Cooling Steady State at rated compressor speed SEER “B-Low”...

  • Page 13: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MUZ-FX06NLHZ Unit: inch MUZ-FX09NLHZ MUZ-FX12NLHZ LIQUID REFRIGERANT PIPE FLARED 1/4ʺ REFRIGERANT PIPE JOINT GAS REFRIGERANT PIPE FLARED 3/8ʺ OBD946_13...
  • Page 14 MUZ-FX15NLHZ Unit: inch MUZ-FX18NLHZ MUZ-FX24NLHZ OBD946_14...

  • Page 15: Wiring Diagram

    WIRING DIAGRAM MUZ-FX06NLHZ MUZ-FX09NLHZ MUZ-FX12NLHZ MUZ-FX15NLHZ MUZ-FX18NLHZ MUZ-FX24NLHZ OBD946_15...

  • Page 16: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MUZ-FX06NLHZ Unit: Inch (mm) MUZ-FX09NLHZ MUZ-FX12NLHZ Refrigerant pipe 3/8 (ø9.52) 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve Muffler Defrost temperature thermistor Outdoor Capillary tube thermistor Discharge Flared connection RT61 heat O.D. 0.118 × RT68 temperature exchanger...
  • Page 17 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: ft. Piping size O.D: in. Model Max. Length Max. Height difference Liquid MUZ-FX06NLHZ MUZ-FX09NLHZ MUZ-FX12NLHZ MUZ-FX15NLHZ MUZ-FX18NLHZ MUZ-FX24NLHZ Indoor unit Max. Height difference Max. Length Outdoor unit ADDITIONAL REFRIGERANT CHARGE (R454B: oz.) NOTE: Refrigerant piping exceeding 25 ft.

  • Page 18: Data

    DATA MUZ-FX06NLHZ MUZ-FX09NLHZ MUZ-FX12NLHZ MUZ-FX15NLHZ MUZ-FX18NLHZ MUZ-FX24NLHZ 7-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Outdoor intake air DB temperature (˚F) Model IWB (˚F) 0.87 0.25 0.87 0.27 0.87 0.29 MUZ-FX06NLHZ 1.00 0.24 1.00 0.26 1.00 0.28 1.00 0.22 1.00 0.25 1.00 0.27...
  • Page 19 Indoor air Outdoor intake air DB temperature (˚F) Model IWB (˚F) 0.87 0.31 0.87 0.32 MUZ-FX06NLHZ 1.00 0.30 1.00 0.31 1.00 0.29 1.00 0.30 0.87 0.54 0.87 0.56 MUZ-FX09NLHZ 1.00 0.52 1.00 0.54 1.00 0.50 1.00 0.52 12.0 0.75 0.86 11.0 0.75 0.90...
  • Page 20 3) HEATING CAPACITY CORRECTIONS Refrigerant piping length (one way: ft.) 25 (std.) MUZ-FX06NLHZ MUZ-FX09NLHZ 0.997 0.993 — MUZ-FX12NLHZ MUZ-FX15NLHZ MUZ-FX18NLHZ 0.997 0.993 0.987 MUZ-FX24NLHZ 4) HEATING CAPACITY Indoor air Outdoor intake air WB temperature (˚F) Model IDB (˚F) 0.32 0.40 0.47 0.53 0.55...
  • Page 21 7-2. PERFORMANCE CURVE Cooling (at Rated frequency) Cooling capacity (at Rated frequency) Indoor intake air Wet-bulb temperature( F) Outdoor intake air DB temperature(°F) MUZ-FX06NLHZ MUZ-FX09NLHZ SHF at rating condition = 1.00 SHF at rating condition = 1.00 = 425 CFM = 535 CFM Airflow Airflow...
  • Page 22 Heating (at Rated frequency) Heating capacity (at Rated frequency) Outdoor intake air WB temperature (°F) MUZ-FX06NLHZ MUZ-FX09NLHZ = 485 CFM = 485 CFM Airflow Airflow -0.5 Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) MUZ-FX12NLHZ MUZ-FX15NLHZ Airflow = 485 CFM Airflow...
  • Page 23 7-3. CONDENSING PRESSURE Cooling Data are based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUZ-FX06NLHZ (psig) (psig) 95 100 105 110 115 (°F) 95 100 105 110 115 (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-FX09NLHZ (psig)
  • Page 24 MUZ-FX15NLHZ (psig) (psig) 95 100 105 110 115 95 100 105 110 115 (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-FX18NLHZ (psig) (psig) 95 100 105 110 115 (°F) 95 100 105 110 115 (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-FX24NLHZ (psig) (psig)
  • Page 25 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. MUZ-FX06NLHZ (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-FX09NLHZ (psig) (psig) (°F) (°F)
  • Page 26 MUZ-FX15NLHZ (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-FX18NLHZ (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-FX24NLHZ (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature NOTE: 1. Press the emergency operation switch on the front of the indoor unit, and select either EMERGENCY COOL mode or EMERGENCY HEAT mode before starting to operate the air conditioner.

  • Page 27: Standard Operation Data

    7-4. STANDARD OPERATION DATA Model MSZ-FX06NL Item Unit COOL HEAT Capacity Btu/h 6,000 9,000 — 1.00 — Input 0.28 0.54 Rated frequency Indoor unit MSZ-FX06NL Power supply V, phase, Hz 208/230, 1 , 60 Input 0.014 0.019 Fan motor current 0.17/0.15 0.21/0.19 Outdoor unit...
  • Page 28 Model MSZ-FX09NL Item Unit COOL HEAT Capacity Btu/h 9,000 12,000 — 1.00 — Input 0.49 0.71 Rated frequency 29.5 Indoor unit MSZ-FX09NL Power supply V, phase, Hz 208/230, 1, 60 Input 0.024 0.019 Fan motor current 0.27/0.24 0.21/0.19 MUZ-FX09NLHZ Outdoor unit Power supply V, phase, Hz 208/230, 1, 60...
  • Page 29 Model MSZ-FX12NL Item Unit COOL HEAT Capacity Btu/h 12,000 13,200 — 0.88 — Input 0.78 0.92 Rated frequency 44.5 54.5 Indoor unit MSZ-FX12NL Power supply V, phase, Hz 208/230, 1, 60 Input 0.024 0.019 Fan motor current 0.27/0.24 0.21/0.19 MUZ-FX12NLHZ Outdoor unit Power supply V, phase, Hz...
  • Page 30 Model MSZ-FX15NL Item Unit COOL HEAT Capacity Btu/h 15,000 16,500 — 0.81 — Input 1.02 1.08 Rated frequency Indoor unit MSZ-FX15NL Power supply V, phase, Hz 208/230, 1, 60 Input 0.033 0.036 Fan motor current 0.34/0.31 0.36/0.33 MUZ-FX15NLHZ Outdoor unit Power supply V, phase, Hz 208/230, 1, 60...
  • Page 31 Model MSZ-FX18NL Item Unit COOL HEAT Capacity Btu/h 17,200 17,000 — 0.76 — Input 1.32 1.39 Rated frequency Indoor unit MSZ-FX18NL Power supply V, phase, Hz 208/230, 1, 60 Input 0.033 0.036 Fan motor current 0.34/0.31 0.36/0.33 MUZ-FX18NLHZ Outdoor unit Power supply V, phase, Hz 208/230, 1, 60...
  • Page 32 Model MSZ-FX24NL Item Unit COOL HEAT Capacity Btu/h 20,800 19,800 — 0.78 — Input 1.56 1.50 Rated frequency 52.5 48.5 Indoor unit MSZ-FX24NL Power supply V, phase, Hz 208/230, 1, 60 Input 0.056 0.064 Fan motor current 0.53/0.48 0.59/0.53 MUZ-FX24NLHZ Outdoor unit Power supply V, phase, Hz...
  • Page 33 7-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-FX06NLHZ Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input (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-FX09NLHZ...
  • Page 34 MUZ-FX18NLHZ 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-FX24NLHZ Correction of Heating total input Correction of Cooling capacity...

  • Page 35: Actuator Control

    ACTUATOR CONTROL MUZ-FX06NLHZ MUZ-FX09NLHZ MUZ-FX12NLHZ MUZ-FX15NLHZ MUZ-FX18NLHZ MUZ-FX24NLHZ 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. 5 seconds 15 seconds Compressor...

  • Page 36: Service Functions

    SERVICE FUNCTIONS MUZ-FX06NLHZ MUZ-FX09NLHZ MUZ-FX12NLHZ MUZ-FX15NLHZ MUZ-FX18NLHZ MUZ-FX24NLHZ 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 finish temperature MUZ-FX06NLHZ MUZ-FX15NLHZ Jumper...

  • Page 37: Troubleshooting

    TROUBLESHOOTING MUZ-FX06NLHZ MUZ-FX09NLHZ MUZ-FX12NLHZ MUZ-FX15NLHZ MUZ-FX18NLHZ MUZ-FX24NLHZ 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 confirm- ing the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
  • Page 38 10-2. FAILURE MODE RECALL FUNCTION AND ERROR CODE DISPLAY MODE Outline of the function This air conditioner can memorize the failure which has occurred last time. Even though LED indication listed on the troubleshooting check table (10-3.) disappears, the memorized failure can be recalled.
  • Page 39 A (From previous page) Press OFF/ON (stop/operate) button of the remote controller with the remote controller headed towards the indoor unit. *1. The indoor unit is normal, but the outdoor unit might be abnormal. Does the upper OPERATION INDICATOR lamp on There are some abnormalities that cannot be recalled with this way.
  • Page 40 2. Flow chart of the 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. Get close to the front of the indoor unit.
  • Page 41 A (From previous page) Releasing the failure mode recall function Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again. Press RESET button of the remote controller. Repair the failure parts. Deleting the memorized abnormal condition After repairing the unit, recall the failure mode again according to “Setting up the failure mode recall function”...
  • Page 42 3. Flow chart of error code display mode This explains how customers can check the error code on their own. This is included in OPERATING INSTRUCTIONS. Operational procedure The remote controller is powered OFF. Get close to the front of the indoor unit. Point the remote controller at the receiving section of the indoor unit, and keep pressing CHECK with a fine-tipped object until the beeps.
  • Page 43 4. Table of outdoor unit failure mode recall function OPERATION Indoor/outdoor Outdoor unit Error INDICATOR Abnormal point LED indication unit failure Condition Remedy failure mode lamp code (Failure mode/protection) (Outdoor P.C. board) mode recall recall function (Indoor unit) function Not blink None (Normal) —...
  • Page 44 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-3.). OPERATION Indoor/outdoor Outdoor unit Error INDICATOR Abnormal point LED indication unit failure Condition Remedy failure mode lamp code (Failure mode/protection) (Outdoor P.C. board) mode recall recall function (Indoor unit) function...
  • Page 45 10-3. TROUBLESHOOTING CHECK TABLE Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink every Outdoor power Overcurrent protection cut-out operates 3 consecutive times • Reconnect connector of does not 2.5 seconds system within 1 minute after the compressor gets started. compressor.
  • Page 46 Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink Deceleration of the FX06/09/12 When the input current exceeds approximately The unit is normal, but check the operates. 2.5 seconds OFF operational 10A, compressor frequency lowers. following. frequency of the •...
  • Page 47 10-4. TROUBLESHOOTING CRITERION OF MAIN PARTS MUZ-FX06NLHZ MUZ-FX09NLHZ MUZ-FX12NLHZ MUZ-FX15NLHZ MUZ-FX18NLHZ MUZ-FX24NLHZ Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a multimeter. Fin temperature Refer to 10-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for thermistor (RT64) the chart of thermistor.

  • Page 48: Troubleshooting Flow

    10-5. 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 10-5. “Check of open phase”. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. See 10-5.
  • Page 49 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 *Measure the resistance between the lead wires at 3 points. BLK-WHT BLK-RED WHT-RED <<Judgement>>...
  • Page 50 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 51 H Check of R.V. coil MUZ-FX06/09/12 * 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 52 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 terminal of outdoor fan motor normal? (Refer to 10-4.) Disconnect CN932 from the inverter P.C.
  • Page 53 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 54 L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 10-5. .) Is the fuse (F901) blown on the inverter 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 55 M How to check miswiring and serial signal error Turn ON the power supply. Is there rated voltage in the power supply? Check the power supply. Is there rated voltage between outdoor terminal block S1 and S2? Check the wiring. Press the emergency operation switch once.
  • Page 56 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 10-6.1. 2. Is the resistance of defrost heater normal? Refer to 10-4. 3. Does the heater protector remain conducted (not open)? 4.
  • Page 57 P Check of compressor protector Disconnect the connector of compressor protector in the inverter P.C. board, and check the conduc- tion of compressor protector. Operate the unit Is the discharge temperature Is the compressor and re-confirm if thermistor normal? Refer to 10-5. protector conductive? the abnormality “Check of outdoor thermistors”.
  • Page 58 Q 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 out- or is the distance between the antennas door unit.

  • Page 59: Inverter P.c. Board

    10-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-FX06NLHZ MUZ-FX09NLHZ MUZ-FX12NLHZ Smoothing Smoothing Heater R.V.coil Back side of unit capacitor capacitor (CN722) (CN721) DB61 (C61) (C62) 208/230V AC 208/230 V AC 260 - 370 V DC Fuse (F801) Fuse (F701) Fuse (F62) 208/230 V AC...
  • Page 60 MUZ-FX15NLHZ MUZ-FX18NLHZ MUZ-FX24NLHZ Smoothing Smoothing Smoothing Output to drive Fuse (F880) Heater (CN601) Capacitor Capacitor Capacitor outdoor fan motor Back side of unit T3.15AL250V 208/230 V AC (CB1) (CB2) (CB3) (CN932) Fuse (F601) T3.15AL250V 208/230 V AC Fuse (F62) R.V. coil/ 15 A 250 V 21S4 (CN602)
  • Page 61 2. Fuse P.C. board MUZ-FX15NLHZ MUZ-FX18NLHZ MUZ-FX24NLHZ FUSE (F66) FUSE (F65) T6.3AL250V T6.3AL250V OBD946_61...

  • Page 62: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS <Detaching method of the terminal with locking mechanism> The terminal which has the locking mechanism can be detached as shown below. There are 2 types 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 63 OPERATING PROCEDURE PHOTOS/FIGURES Photo 5 Photo 6 Screws of the conduit cover Screw of the conduit plate (These screws are different shape from the other (This screw is different in shape from the other screws. Do not mix them with the other screws.) screws.
  • Page 64 OPERATING PROCEDURE PHOTOS/FIGURES * Connection procedure when attaching the inverter Photo 11 Lead wires of the heat exchanger P.C. board (Photo 11) temperature, the discharge tem- Lead wires of the 1. Connect the lead wires of the heat exchanger tempera- perature and the defrost thermistor ambient temperature ture thermistor, the defrost thermistor and discharge...
  • Page 65 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the discharge temperature thermistor, Photo 12 defrost thermistor, outdoor heat exchanger tem- Outdoor heat Ambient temperature perature thermistor and ambient temperature exchanger temperature thermistor thermistor thermistor (1) Remove the cabinet and panels (refer to section 1). (2) Disconnect the lead wire to the reactor and the following connectors: <Inverter P.C.
  • Page 66 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing R. V. coil Photo 14 (1) Remove the cabinet and panels (refer to section 1). Screw of the R.V. coil (2) Disconnect the following connectors: <Inverter P.C. board> CN721 (R.V. coil) Discharge (3) Remove the R.V. coil. temperature thermistor Compressor...
  • Page 67 11-2. MUZ-FX15NLHZ MUZ-FX18NLHZ MUZ-FX24NLHZ NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 2 (1) Remove the screws of the service panel. Screws of (2) Remove the screws of the top panel. the top panel (3) Remove the screw of the valve cover.
  • Page 68 OPERATING PROCEDURE PHOTOS/FIGURES Photo 5 Photo 6 Screws of the conduit cover Screw of the conduit plate 2. Removing the inverter assembly, inverter P.C. Photo 7 board and fuse P.C. board 2-1. Removing the inverter assembly and inverter P.C. board (1) Remove the top panel, cabinet and service panel.
  • Page 69 OPERATING PROCEDURE PHOTOS/FIGURES Photo 11 * Connection procedure when attaching the inverter P.C. board (Photo 8, 9, 10, 11, 12) Hook of the lead wires of the Hook of the lead 1. Attach the heat sink support to the P.C. board support. P.C.
  • Page 70 OPERATING PROCEDURE PHOTOS/FIGURES 2-2. Removing the fuse P.C. board Photo 13 Support Fuse P.C. board (1) Remove the top panel, cabinet and service panel. (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the inverter P.C. board connectors. (Refer to section 2-1. (2)) (3) Remove the compressor connector (CN61).

  • Page 71: Removing Outdoor Fan Motor

    OPERATING PROCEDURE PHOTOS/FIGURES Photo 15 4. Removing outdoor fan motor (1) Remove the top panel, cabinet and service panel. Propeller fan nut (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> Propeller fan CN931, CN932 (Fan motor) (3) Remove the propeller fan nut.
  • Page 72 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the compressor and 4-way valve Photo 17 (1) Remove the cabinet and panels. (Refer to section 1.) (2) Remove the inverter assembly. (Refer to section 2.) (3) Remove the screws fixing the reactor. (4) Remove the reactor. (5) Remove the soundproof felt.

  • Page 73: Position Of The Center Of Gravity

    POSITION OF THE CENTER OF GRAVITY Unit: inch (mm) Model name MUZ-FX06NLHZ 11-1/16 5-9/16 13-3/8 31-1/2 11-1/4 28-1/8 MUZ-FX09NLHZ (280) (140) (340) (800) (285) (714) MUZ-FX12NLHZ MUZ-FX15NLHZ 5-29/32 15-11/32 33-1/16 34-5/8 MUZ-FX18NLHZ (330) (150) (390) (840) (330) (880) MUZ-FX24NLHZ OBD946_73...

  • Page 74: Noise Criterion Curves

    NOISE CRITERION CURVES MUZ-FX06NLHZ MUZ-FX09NLHZ NOTCH SPL(dB(A)) LINE NOTCH 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 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR HEARING FOR NC-20 NC-20 CONTINUOUS CONTINUOUS NOISE NOISE 1000 2000...
  • Page 75 MUZ-FX18NLHZ MUZ-FX24NLHZ NOTCH SPL(dB(A)) LINE NOTCH 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 APPROXIMATE APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR HEARING FOR NC-20 NC-20 CONTINUOUS CONTINUOUS NOISE NOISE 1000 2000 4000 8000 1000...

  • Page 76: Max. Heating Capacity In Low Ambient Temperature

    MAX. HEATING CAPACITY IN LOW AMBIENT TEMPERATURE MUZ-FX06NLHZ 120% 100% Outdoor Temperature Degrees (°F) HEATING CAPACITY Outdoor Temperature Degrees (°F) -10.0 75.0 % Heating Capacity 100% 100% MUZ-FX09NLHZ 120% 100% Outdoor Temperature Degrees (°F) HEATING CAPACITY Outdoor Temperature Degrees (°F) -10.0 75.0 % Heating Capacity...
  • Page 77 MUZ-FX12NLHZ 120% 100% Outdoor Temperature Degrees (°F) HEATING CAPACITY Outdoor Temperature Degrees (°F) -10.0 75.0 % Heating Capacity 100% 100% MUZ-FX15NLHZ 120% 100% Outdoor Temperature Degrees (°F) HEATING CAPACITY Outdoor Temperature Degrees (°F) -10.0 75.0 % Heating Capacity 100% 100% OBD946_77...
  • Page 78 MUZ-FX18NLHZ 120% 100% Outdoor Temperature Degrees (°F) HEATING CAPACITY Outdoor Temperature Degrees (°F) -10.0 75.0 % Heating Capacity 100% 100% MUZ-FX24NLHZ 120% 100% Outdoor Temperature Degrees (°F) HEATING CAPACITY Outdoor Temperature Degrees (°F) -10.0 75.0 % Heating Capacity 100% 100% OBD946_78...

  • Page 79: Performance Chart

    PERFORMANCE CHART 15-1. INVERTER COOLING CAPACITY MUZ-FX06NLHZ CAPACITY (Btu/h): 6000 INPUT (W): 280 SHF: 1.00 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. P.C. 7050 5781 0.82 6750 5535 0.82 6480 5314 0.82 6240 5117 0.82 7350 5145 0.70...
  • Page 80 MUZ-FX06NLHZ CAPACITY (Btu/h): 6000 INPUT (W): 280 SHF: 1.00 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. 5880 4822 0.82 5400 4428 0.82 4980 4084 0.82 6180 4326 0.70 5760 4032 0.70 5340 3738 0.70 5880 5057 0.86 5400...
  • Page 81 MUZ-FX09NLHZ CAPACITY (Btu/h): 9000 INPUT (W): 490 SHF: 1.00 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. P.C. 10575 8672 0.82 10125 8303 0.82 9720 7970 0.82 9360 7675 0.82 11025 7718 0.70 10575 7403 0.70 10260 7182 0.70 9900...
  • Page 82 MUZ-FX09NLHZ CAPACITY (Btu/h): 9000 INPUT (W): 490 SHF: 1.00 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. 8820 7232 0.82 8100 6642 0.82 7470 6125 0.82 9270 6489 0.70 8640 6048 0.70 8010 5607 0.70 8820 7585 0.86 8100...
  • Page 83 MUZ-FX12NLHZ CAPACITY (Btu/h): 12000 INPUT (W): 780 SHF: 0.88 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. P.C. 14100 9870 0.70 13500 9450 0.70 12960 9072 0.70 12480 8736 0.70 14700 8526 0.58 14100 8178 0.58 13680 7934 0.58 13200 7656...
  • Page 84 MUZ-FX12NLHZ CAPACITY (Btu/h): 12000 INPUT (W): 780 SHF: 0.88 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. 11760 8232 0.70 10800 7560 0.70 9960 6972 0.70 12360 7169 0.58 11520 6682 0.58 10680 6194 0.58 11760 8702 0.74 10800 7992 0.74...
  • Page 85 MUZ-FX15NLHZ CAPACITY (Btu/h): 15000 INPUT (W): 1020 SHF: 0.81 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. P.C. 17625 11104 0.63 16875 10631 0.63 16200 10206 0.63 15600 9828 0.63 18375 9371 0.51 17625 8989 0.51 17100 8721 0.51 16500 8415...
  • Page 86 MUZ-FX15NLHZ CAPACITY (Btu/h): 15000 INPUT (W): 1020 SHF: 0.81 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. 14700 9261 0.63 1000 13500 8505 0.63 1061 12450 7844 0.63 1102 15450 7880 0.51 1040 14400 7344 0.51 1091 13350 6809 0.51 1153...
  • Page 87 MUZ-FX18NLHZ CAPACITY (Btu/h): 17200 INPUT (W): 1320 SHF: 0.76 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. P.C. 20210 11722 0.58 1056 19350 11223 0.58 1109 18576 10774 0.58 1162 17888 10375 0.58 1214 21070 9692 0.46 1109 20210 9297 0.46...
  • Page 88 MUZ-FX18NLHZ CAPACITY (Btu/h): 17200 INPUT (W): 1320 SHF: 0.76 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. 16856 9776 0.58 1294 15480 8978 0.58 1373 14276 8280 0.58 1426 17716 8149 0.46 1346 16512 7596 0.46 1412 15308 7042 0.46 1492...
  • Page 89 MUZ-FX24NLHZ CAPACITY (Btu/h): 20800 INPUT (W): 1560 SHF: 0.78 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. P.C. 24440 14664 0.60 1248 23400 14040 0.60 1310 22464 13478 0.60 1373 21632 12979 0.60 1435 25480 12230 0.48 1310 24440 11731 0.48...
  • Page 90 MUZ-FX24NLHZ CAPACITY (Btu/h): 20800 INPUT (W): 1560 SHF: 0.78 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. 20384 12230 0.60 1529 18720 11232 0.60 1622 17264 10358 0.60 1685 21424 10284 0.48 1591 19968 9585 0.48 1669 18512 8886 0.48 1763...

  • Page 91: Capacity Correction Ratio Curve

    CAPACITY CORRECTION RATIO CURVE FOR PIPING LENGTH Correction ratio of capacity according to the length of piping (cooling) Indoor unit 06 class Indoor unit 100% 24 class Indoor unit 15 class Indoor unit 18 class Indoor unit 09 class Indoor unit 30 class Indoor unit 36 class...

  • Page 92: Part Load Capacity Chart

    PART LOAD CAPACITY CHART MUZ-FX06NLHZ Rated Q(Btu/h): 6000 1) COOLING Indoor W.B. 71°F / 21.7°C 67°F / 19.4°C 63°F / 17.2°C Outdoor D.B. Max. Rated 75% Min. Max. Rated 75% Min. Max. Rated 75% Min. (°F) (°C) 46.1 Q(Btu/h) 12640 5520 9470 6430 3250 1530 11970 5130 8970 6090 3080 1450 11250 4680 8420 5720 2890 1360 1460 320 1090 140 1380...
  • Page 93 MUZ-FX06NLHZ Rated Q(Btu/h): 9000 2) HEATING Indoor D.B. 78.8°F / 26.0°C 70°F / 21.1°C 59°F / 15.0°C Outdoor W.B. Max. Rated 75% Min. Max. Rated 75% Min. Max. Rated 75% Min. (°F) (°C) 18.3 Q(Btu/h) 24980 11240 18720 12550 6170 2260 26000 11700 19480 13060 6420 2350 27020 12160 20240 13570 6670 2440 2010 610 1510 1010 180 1910...
  • Page 94 MUZ-FX09NLHZ Rated Q(Btu/h): 9000 1) COOLING Indoor W.B. 71°F / 21.7°C 67°F / 19.4°C 63°F / 17.2°C Outdoor D.B. Max. Rated 75% Min. Max. Rated 75% Min. Max. Rated 75% Min. (°F) (°C) 46.1 Q(Btu/h) 13550 8280 10350 6970 3770 2260 12830 7700 9800 6600 3570 2140 12060 7020 9210 6190 3360 2010 1860 560 1390 190 1750...
  • Page 95 MUZ-FX09NLHZ Rated Q(Btu/h): 12000 2) HEATING Indoor D.B. 78.8°F / 26.0°C 70°F / 21.1°C 59°F / 15.0°C Outdoor W.B. Max. Rated 75% Min. Max. Rated 75% Min. Max. Rated 75% Min. (°F) (°C) 18.3 Q(Btu/h) 26610 14990 20090 13300 6780 3260 27690 15600 20910 13840 7060 3390 28770 16210 21730 14380 7340 3520 2420 810 1830 1210 290 2300...
  • Page 96 MUZ-FX12NLHZ Rated Q(Btu/h): 12000 1) COOLING Indoor W.B. 71°F / 21.7°C 67°F / 19.4°C 63°F / 17.2°C Outdoor D.B. Max. Rated 75% Min. Max. Rated 75% Min. Max. Rated 75% Min. (°F) (°C) 46.1 Q(Btu/h) 14540 11040 11030 7520 3840 2260 13770 10260 10440 7120 3630 2140 12940 9360 9810 6690 3410 2010 1960 900 1450 190 1840...
  • Page 97 MUZ-FX12NLHZ Rated Q(Btu/h): 13200 2) HEATING Indoor D.B. 78.8°F / 26.0°C 70°F / 21.1°C 59°F / 15.0°C Outdoor W.B. Max. Rated 75% Min. Max. Rated 75% Min. Max. Rated 75% Min. (°F) (°C) 18.3 Q(Btu/h) 29350 16490 22090 14820 7260 3350 30550 17160 22990 15420 7560 3490 31750 17830 23890 16020 7860 3630 2430 1040 1830 1230 280 2310 990 1740 1170...
  • Page 98 MUZ-FX15NLHZ Rated Q(Btu/h): 15000 1) COOLING 1020 Indoor W.B. 71°F / 21.7°C 67°F / 19.4°C 63°F / 17.2°C Outdoor D.B. Max. Rated 75% Min. Max. Rated 75% Min. Max. Rated 75% Min. (°F) (°C) 46.1 Q(Btu/h) 17240 13800 13220 9010 4990 3340 16330 12830 12520 8530 4720 3160 15340 11700 11770 8010 4440 2970 2590 1170 1930 1240 300 2440 1130 1820 1170 290 2320 1080 1730 1120...
  • Page 99 MUZ-FX15NLHZ Rated Q(Btu/h): 16500 2) HEATING 1080 Indoor D.B. 78.8°F / 26.0°C 70°F / 21.1°C 59°F / 15.0°C Outdoor W.B. Max. Rated 75% Min. Max. Rated 75% Min. Max. Rated 75% Min. (°F) (°C) 18.3 Q(Btu/h) 35470 20610 26510 17940 8960 5840 36920 21450 27590 18670 9330 6080 38370 22290 28670 19400 9700 6320 2990 1230 2230 1510 500 2840 1170 2120 1430 470 2690 1110 2010 1350...
  • Page 100 MUZ-FX18NLHZ Rated Q(Btu/h): 17200 1) COOLING 1320 Indoor W.B. 71°F / 21.7°C 67°F / 19.4°C 63°F / 17.2°C Outdoor D.B. Max. Rated 75% Min. Max. Rated 75% Min. Max. Rated 75% Min. (°F) (°C) 46.1 Q(Btu/h) 19410 15820 14650 10080 5330 3340 18380 14710 13880 9550 5040 3160 17270 13420 13040 8980 4740 2970 2780 1520 2050 1340 300 2620 1470 1930 1270 290 2500 1400 1840 1200...
  • Page 101 MUZ-FX18NLHZ Rated Q(Btu/h): 17000 2) HEATING 1390 Indoor D.B. 78.8°F / 26.0°C 70°F / 21.1°C 59°F / 15.0°C Outdoor W.B. Max. Rated 75% Min. Max. Rated 75% Min. Max. Rated 75% Min. (°F) (°C) 18.3 Q(Btu/h) 37720 21240 28190 19050 9530 5960 39260 22100 29340 19830 9920 6200 40800 22960 30490 20610 10310 6440 3290 1580 2450 1650 520 3120 1500 2330 1570 490 2950 1420 2210 1490...
  • Page 102 MUZ-FX24NLHZ Rated Q(Btu/h): 20800 1) COOLING 1560 Indoor W.B. 71°F / 21.7°C 67°F / 19.4°C 63°F / 17.2°C Outdoor D.B. Max. Rated 75% Min. Max. Rated 75% Min. Max. Rated 75% Min. (°F) (°C) 46.1 Q(Btu/h) 23930 19140 17730 11800 5610 2260 22660 17780 16790 11170 5310 2140 21300 16220 15780 10500 4990 2010 3960 1790 2920 1920 300 3740 1730 2750 1810 290 3570 1650 2620 1720...
  • Page 103 MUZ-FX24NLHZ Rated Q(Btu/h): 19800 2) HEATING 1500 Indoor D.B. 78.8°F / 26.0°C 70°F / 21.1°C 59°F / 15.0°C Outdoor W.B. Max. Rated 75% Min. Max. Rated 75% Min. Max. Rated 75% Min. (°F) (°C) 18.3 Q(Btu/h) 45220 24730 33920 22620 11310 6690 47060 25740 35300 23540 11770 6960 48900 26750 36680 24460 12230 7230 4090 1710 3060 2030 1020 600 3880 1620 2900 1930 570 3670 1530 2740 1830...
  • Page 104 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2024 MITSUBISHI ELECTRIC CORPORATION Issued: Nov. 2024. No. OBD946 REVISED EDITION-A Published Nov. 2024. No. OBD946 Made in Japan Specifications are subject to change without notice.

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