Mitsubishi Electric MUZ-WX09NL Technical & Service Manual
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Mitsubishi Electric MUZ-WX09NL Technical & Service Manual

Mitsubishi Electric MUZ-WX09NL Technical & Service Manual

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OUTDOOR UNIT
TECHNICAL &
SERVICE MANUAL
Models
MUZ-WX09NL
MUZ-WX12NL
MUZ-WX18NL
MUZ-WX24NL
MUZ-WX24NL
HFC
utilized
R454B
-
U1
-
U1
-
U1
-
Indoor unit technical & service manual
U1
MSZ-WX•NL Series (OBD954)
Indoor unit service manual
MSZ-WX•NL Series (OBH954)
Outdoor unit service manual
MUZ-WX•NL Series (OBH955)
CONTENTS
1. TECHNICAL CHANGES· ····························· 2
USING REFRIGERANT R454B· ···················· 3
3. PART NAMES AND FUNCTIONS· ················· 8
4. SPECIFICATION········································· 9
5. OUTLINES AND DIMENSIONS· ···················12
6. WIRING DIAGRAM· ···································14
7. REFRIGERANT SYSTEM DIAGRAM· ···········16
8. DATA· ······················································19
9. ACTUATOR CONTROL ······························30
10. SERVICE FUNCTIONS· ······························31
11. TROUBLESHOOTING· ·······························32
12. DISASSEMBLY INSTRUCTIONS· ·················56
14. NOISE CRITERION CURVES ·······················67
IN LOW AMBIENT TEMPERATURE ··············68
16. PERFORMANCE CHART ····························70
FOR PIPING LENGTH ································78
18. PART LOAD CAPACITY CHART ··················79
Revision A:
• MUZ-WX09/12/18NL -
U1
added.
OBD955 is void.
No. OBD955
REVISED EDITION-A
have been
66
· ····

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Summary of Contents for Mitsubishi Electric MUZ-WX09NL

  • Page 1: Table Of Contents

    OBD955 is void. OUTDOOR UNIT No. OBD955 TECHNICAL & utilized REVISED EDITION-A SERVICE MANUAL R454B Models MUZ-WX09NL MUZ-WX12NL MUZ-WX18NL MUZ-WX24NL Indoor unit technical & service manual MSZ-WX•NL Series (OBD954) Indoor unit service manual MSZ-WX•NL Series (OBH954) Outdoor unit service manual MUZ-WX•NL Series (OBH955)

  • Page 2: Technical Changes

    • When opening or closing the valve below freezing temperatures, refrigerant may spurt out from the gap between the valve stem and the valve body, resulting in injuries. Revision A: • MUZ-WX09/12/18NL - have been added. TECHNICAL CHANGES MUZ-WX24NL - 1. New model MUZ-WX09NL - MUZ-WX12NL - MUZ-WX18NL - 1. New model OBD955A...

  • 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 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 3. 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: Part Names And Functions

    PART NAMES AND FUNCTIONS MUZ-WX09NL MUZ-WX12NL MUZ-WX18NL Air inlet (Back and side) Piping Air outlet Drain hose Drain outlet MUZ-WX24NL Air inlet (Back and side) Piping Air outlet Drain hose Drain outlet OBD955A...

  • Page 9: Specification

    SPECIFICATION Outdoor unit model MUZ-WX09NL MUZ-WX12NL MUZ-WX18NL Cooling * Btu/h 9,000 (3,800 – 10,000) 12,000 (3,800 – 12,200) 17,200 (5,800 – 18,000) Capacity Rated (Minimum – Maximum) Heating 47 * Btu/h 10,900 (4,500 – 11,800) 12,200 (4,500 – 14,500) 18,000 (5,400 – 20,800)
  • Page 10 Outdoor unit model MUZ-WX24NL Cooling * Btu/h 22,400 (5,800 – 22,400) Capacity Rated (Minimum – Maximum) Heating 47 * Btu/h 26,000 (5,400 – 26,000) Capacity Heating 17 * Btu/h 17,000 (17,800) Rated (Maximum) Cooling * 2,800 (330 – 2,800) Power consumption Rated (Minimum –...
  • Page 11 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 12: Outlines And Dimensions

    OUTLINES AND DIMENSIONS MUZ-WX09NL MUZ-WX12NL MUZ-WX18NL 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 holes Liquid refrigerant pipe joint Refrigerant pipe (flared) ø1/4...
  • Page 13 MUZ-WX24NL Unit: inch LIQUID REFRIGERANT PIPE FLARED 1/4ʺ REFRIGERANT PIPE JOINT GAS REFRIGERANT PIPE FLARED 1/2ʺ OBD955A...

  • Page 14: Wiring Diagram

    WIRING DIAGRAM MUZ-WX09NL MUZ-WX12NL MUZ-WX18NL OBD955A...
  • Page 15 MUZ-WX24NL OBD955A...

  • Page 16: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM MUZ-WX09NL MUZ-WX12NL 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) Outdoor thermistor Muffler heat Discharge Flared connection RT68 Service port exchanger temperature Service port...
  • Page 17 MUZ-WX24NL Unit: Inch (mm) Refrigerant pipe 1/2 (ø12.7) 4-way valve (with heat insulator) Muffler Outdoor heat exchanger Stop valve Muffler Defrost temperature Outdoor thermistor Capillary tube thermistor Discharge Flared connection RT61 heat O.D. 0.118 × RT68 temperature exchanger I.D. 0.079 × 8-9/32 thermistor (ø3.0 ×...
  • Page 18 MAX. REFRIGERANT PIPING LENGTH and MAX. HEIGHT DIFFERENCE Refrigerant piping: ft. Piping size O.D: in. Model Max. Length Max. Height difference Liquid MUZ-WX09NL MUZ-WX12NL MUZ-WX18NL MUZ-WX24NL Indoor unit Max. Height difference Max. Length Outdoor unit OBD955A...

  • Page 19: Data

    DATA MUZ-WX09NL MUZ-WX12NL MUZ-WX18NL MUZ-WX24NL 8-1. PERFORMANCE DATA 1) COOLING CAPACITY Indoor air Outdoor intake air DB temperature (˚F) Model IWB (˚F) 11.0 0.67 0.73 10.3 0.67 0.80 0.67 0.86 MUZ-WX09NL 10.4 0.80 0.69 0.80 0.76 0.80 0.82 0.93 0.66 0.93...

  • Page 20: Heating Capacity

    4) HEATING CAPACITY Indoor air Outdoor intake air WB temperature (˚F) Model IDB (˚F) 0.53 0.67 0.79 0.88 10.6 0.92 11.0 0.94 12.4 0.97 MUZ-WX09NL 0.51 0.65 0.77 0.86 10.9 0.90 11.2 0.92 12.7 0.95 0.49 0.62 0.74 10.0 0.83 11.2...

  • Page 21: Performance Curve

    8-2. 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-WX09NL MUZ-WX12NL SHF at rating condition = 0.80 SHF at rating condition = 0.71 Airflow = 343 CFM Airflow = 343 CFM Outdoor intake air DB temperature (°F)
  • Page 22 Heating (at Rated frequency) Heating capacity (at Rated frequency) Outdoor intake air WB temperature (°F) MUZ-WX09NL MUZ-WX12NL Airflow = 391 CFM Airflow = 391 CFM Outdoor intake air WB temperature (°F) Outdoor intake air WB temperature (°F) MUZ-WX18NL MUZ-WX24NL = 453 CFM...
  • Page 23 8-3. CONDENSING PRESSURE Cooling Data are based on the condition of indoor humidity 50 %. Air flow should be set to High speed. MUZ-WX09NL (psig) (psig) 95 100 105 110 115 (°F) 95 100 105 110 115 (°F) Outdoor ambient temperature...
  • Page 24 NOTE: Data shown are estimated value. Performance may vary depending on operating conditions. 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-WX09NL (psig) (psig) (°F) (°F)
  • Page 25 MUZ-WX18NL (psig) (psig) (°F) (°F) Outdoor ambient temperature Outdoor ambient temperature MUZ-WX24NL (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 26: Standard Operation Data

    208/230, 1, 60 208/230, 1, 60 Input 0.019 0.020 0.019 0.020 Fan motor current 0.21/0.19 0.23/0.20 0.21/0.19 0.23/0.20 Outdoor unit MUZ-WX09NL MUZ-WX12NL Power supply V, phase, Hz 208/230, 1, 60 208/230, 1, 60 Input 0.801 0.880 1.311 1.070 Comp. current 3.44/3.11 3.95/3.57...
  • Page 27 Model MSZ-WX18NL MSZ-WX24NL Item Unit COOL HEAT COOL HEAT Capacity Btu/h 17,200 18,000 22,400 26,000 — 0.67 — — Input 1.81 1.68 2.80 2.68 Rated frequency Indoor unit MSZ-WX18NL MSZ-WX24NL Power supply V, phase, Hz 208/230, 1, 60 208/230, 1, 60 Input 0.033 0.029...
  • Page 28 8-5. CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ-WX09NL MUZ-WX09NL 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...
  • Page 29 8-6. HOW TO OPERATE FIXED-FREQUENCY OPERATION (Test run operation) 1. Press the emergency operation switch to start COOL or HEAT mode (COOL: Press once, HEAT: Press twice). 2. Test run operation starts and continues to operate for 30 minutes. 3. Compressor operates at rated frequency in COOL mode or 58Hz (WX09/12/18)/55 Hz (WX24) in HEAT mode. 4.

  • Page 30: Actuator Control

    ACTUATOR CONTROL MUZ-WX09NL MUZ-WX12NL MUZ-WX18NL MUZ-WX24NL 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 31: Service Functions

    SERVICE FUNCTIONS MUZ-WX09NL MUZ-WX12NL MUZ-WX18NL MUZ-WX24NL 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 Defrost finish temperature Soldered 46°F (8°C)

  • Page 32: Troubleshooting

    TROUBLESHOOTING MUZ-WX09NL MUZ-WX12NL MUZ-WX18NL MUZ-WX24NL 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, then after confirm- ing the horizontal vane is closed, turn off the breaker and/or disconnect the power plug.
  • Page 33 11-2. 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 (11-3.) disappears, the memorized failure can be recalled.
  • Page 34 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 left/upper OPERATION INDICATOR lamp There are some abnormalities that cannot be recalled with this way.
  • Page 35 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 36 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 37 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 Figure 1 fine-tipped object unil the beeps.
  • Page 38 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 39 NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (11-3.). 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 40 11-3. 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 41 Abnormal point/ Symptom LED indication Condition Remedy Condition Outdoor unit 1-time blink Deceleration of the When the input current exceeds approximately 10A, compres- The unit is normal, but check the operates. 2.5 seconds OFF operational sor frequency lowers. following. frequency of the •...
  • Page 42 11-4. TROUBLESHOOTING CRITERION OF MAIN PARTS MUZ-WX09NL MUZ-WX12NL MUZ-WX18NL MUZ-WX24NL Part name Check method and criterion Figure Defrost thermistor (RT61) Measure the resistance with a multimeter. Fin temperature Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C. board”, for the thermistor (RT64) chart of thermistor.

  • Page 43: Troubleshooting Flow

    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”. Are the voltages balanced? Replace the inverter P.C. board. Check the compressor. See 11-5.
  • Page 44 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 45 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 46 H Check of R.V. coil * 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 47 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 11-4.) Disconnect CN932 from the inverter P.C.
  • Page 48 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 connecting wire. the emergency operation switch. Does the left/upper lamp of the Is there voltage 208/230 V AC Replace the indoor OPERATION INDICATOR lamp on between the indoor terminal...
  • Page 49 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 50: Emergency Operation

    L Check of inverter P.C. board Check the outdoor fan motor. (Refer to 11-5. .) 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 51 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 52 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 53 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 11-5. protector conductive? the abnormality “Check of outdoor thermistors”.
  • Page 54 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 55 11-6. TEST POINT DIAGRAM AND VOLTAGE 1. Inverter P.C. board MUZ-WX09NL MUZ-WX12NL MUZ-WX18NL MUZ-WX24NL Smoothing Smoothing R.V.coil Back side of unit Heater (CN722) capacitor capacitor (CN721) DB61 208/230 V AC (C61) (C62) 208/230 V AC 260 – 370 V DC...

  • Page 56: Disassembly Instructions

    Pull the terminal while pull out the terminal slowly. pushing the locking lever. Locking lever Connector 12-1. MUZ-WX09NL MUZ-WX12NL MUZ-WX18NL : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. NOTE: Turn OFF the power supply before disassembly.
  • Page 57 OPERATING PROCEDURE PHOTOS/FIGURES Screws of Screw of the Photo 4 Screws of the Photo 5 the back panel conduit plate conduit cover 2. Removing the inverter assembly, inverter P.C. Photo 6 board Screw of the heat sink (1) Remove the top panel, cabinet and service panel. support and the separator (Refer to section 1.) (2) Disconnect the lead wire to the reactor and the following...
  • Page 58 OPERATING PROCEDURE PHOTOS/FIGURES * Connection procedure when attaching the inverter Photo 8 MUZ-WX09/12NL P.C. board (Photo 8) 1. Connect the lead wires of the fan motor (Power) to the Lead wires of Lead wires of Lead wires of the outdoor connector on the inverter P.C.
  • Page 59 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing R.V. coil Photo 9 (1) Remove the cabinet and panels. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN721 (R.V. coil) Screw of (3) Remove the R.V. coil. the R.V. coil Discharge temperature thermistor...
  • Page 60 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing outdoor fan motor Photo 11 Screws of the outdoor fan motor (1) Remove the top panel, cabinet and service panel. (Refer to section 1.) (2) Disconnect the following connectors: <Inverter P.C. board> CN931, CN932 (Fan motor) (3) Remove the propeller fan nut.
  • Page 61 12-2. MUZ-WX24NL NOTE: Turn OFF the power supply before disassembly. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the cabinet Photo 1 (1) Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover. Screws of (4) Remove the service panel.
  • Page 62 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 63 OPERATING PROCEDURE PHOTOS/FIGURES * Connection procedure when attaching the inverter Photo 10 Lead wires of the heat exchanger P.C. board (Photo 10) 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 64 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the discharge temperature thermistor, Photo 11 defrost thermistor, outdoor heat exchanger tem- Outdoor heat exchanger Ambient temperature perature thermistor and ambient temperature 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 65 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing R. V. coil Photo 13 (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 66: Position Of The Center Of Gravity

    POSITION OF THE CENTER OF GRAVITY Unit: inch (mm) Model name MUZ-WX09NL 11-1/16 5-9/16 9-1/2 31-1/2 11-1/4 21-5/8 MUZ-WX12NL (280) (140) (240) (800) (285) (550) MUZ-WX18NL 11-13/32 5-1/2 13-3/8 31-1/2 11-1/4 28-1/8 MUZ-WX24NL (290) (140) (340) (800) (285) (714) OBD955A...

  • Page 67: Noise Criterion Curves

    NOISE CRITERION CURVES MUZ-WX09NL MUZ-WX12NL 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...

  • Page 68: Max. Heating Capacity In Low Ambient Temperature

    MAX. HEATING CAPACITY IN LOW AMBIENT TEMPERATURE MUZ-WX09NL 120% 100% Outdoor Temperature Degrees (°F) HEATING CAPACITY Outdoor Temperature Degrees (°F) 14.0 23.0 32.0 41.0 50.0 69.8 75.0 % Heating Capacity 87% 100% 100% 100% 100% MUZ-WX12NL 120% 100% Outdoor Temperature Degrees (°F) HEATING CAPACITY Outdoor Temperature Degrees (°F)
  • Page 69 MUZ-WX18NL 120% 100% Outdoor Temperature Degrees (°F) HEATING CAPACITY Outdoor Temperature Degrees (°F) 14.0 23.0 32.0 41.0 50.0 69.8 75.0 % Heating Capacity 99% 100% 100% 100% 100% MUZ-WX24NL 120% 100% Outdoor Temperature Degrees (°F) HEATING CAPACITY Outdoor Temperature Degrees (°F) 14.0 23.0 32.0...

  • Page 70: Performance Chart

    PERFORMANCE CHART 16-1. INVERTER COOLING CAPACITY MUZ-WX09NL CAPACITY (Btu/h): 9000 INPUT (W): 820 SHF: 0.8 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. P.C. 10575 6557 0.62 10125 6278 0.62 9720 6026 0.62 9360 5803 0.62 11025 5513 0.50...
  • Page 71 MUZ-WX09NL CAPACITY (Btu/h): 9000 INPUT (W): 820 SHF: 0.8 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. 8820 5468 0.62 8100 5022 0.62 7470 4631 0.62 9270 4635 0.50 8640 4320 0.50 8010 4005 0.50 8820 5821 0.66...
  • Page 72 MUZ-WX12NL CAPACITY (Btu/h): 12000 INPUT (W): 1330 SHF: 0.71 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. P.C. 14100 7473 0.53 1064 13500 7155 0.53 1117 12960 6869 0.53 1170 12480 6614 0.53 1224 14700 6027 0.41 1117 14100 5781 0.41...
  • Page 73 MUZ-WX12NL CAPACITY (Btu/h): 12000 INPUT (W): 1330 SHF: 0.71 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. 11760 6233 0.53 1303 10800 5724 0.53 1383 9960 5279 0.53 1436 12360 5068 0.41 1357 11520 4723 0.41 1423 10680 4379 0.41 1503...
  • Page 74 MUZ-WX18NL CAPACITY (Btu/h): 17200 INPUT (W): 1810 SHF: 0.67 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. P.C. 20210 9903 0.49 1448 19350 9482 0.49 1520 18576 9102 0.49 1593 17888 8765 0.49 1665 21070 7796 0.37 1520 20210 7478 0.37...
  • Page 75 MUZ-WX18NL CAPACITY (Btu/h): 17200 INPUT (W): 1810 SHF: 0.67 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. 16856 8259 0.49 1774 15480 7585 0.49 1882 14276 6995 0.49 1955 17716 6555 0.37 1846 16512 6109 0.37 1937 15308 5664 0.37 2045...
  • Page 76 MUZ-WX24NL CAPACITY (Btu/h): 22400 INPUT (W): 2800 SHF: 0.7 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. P.C. 26320 13686 0.52 2240 25200 13104 0.52 2352 24192 12580 0.52 2464 23296 12114 0.52 2576 27440 10976 0.40 2352 26320 10528 0.40...
  • Page 77 MUZ-WX24NL CAPACITY (Btu/h): 22400 INPUT (W): 2800 SHF: 0.7 OUTDOOR DB (°F) INDOOR INDOOR DB (°F) WB (°F) P.C. P.C. P.C. 21952 11415 0.52 2744 20160 10483 0.52 2912 18592 9668 0.52 3024 23072 9229 0.40 2856 21504 8602 0.40 2996 19936 7974 0.40 3164...

  • Page 78: 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 79: Part Load Capacity Chart

    PART LOAD CAPACITY CHART MUZ-WX09NL 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) 9030 8280 7050 4970 2970 3430 8550 7700 6670 4700 2820 3250 8030 7020 6260 4420 2650 3050...
  • Page 80 MUZ-WX09NL Rated Q(Btu/h): 10900 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) 14740 13620 11020 7430 3710 3830 15340 14170 11470 7730 3860 3990 15940 14720 11920 8030 4010 4150...
  • Page 81 MUZ-WX12NL Rated Q(Btu/h): 12000 1) COOLING 1330 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) 11020 11040 8450 5780 3220 3430 10430 10260 8000 5480 3050 3250 9800 9360 7510 5150 2870 3050 1640 1530 1190 290 1550 1480 1120 280 1470 1410 1070...
  • Page 82 MUZ-WX12NL Rated Q(Btu/h): 12200 2) HEATING 1090 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) 18110 15240 13550 9140 4560 4720 18850 15860 14100 9510 4750 4910 19590 16480 14650 9880 4940 5100 1530 1240 1140 400 1450 1180 1080 380 1370 1120 1020...
  • Page 83 MUZ-WX18NL Rated Q(Btu/h): 17200 1) COOLING 1810 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) 16250 15820 13170 10070 6980 5240 15390 14710 12470 9540 6610 4960 14460 13420 11720 8960 6210 4660 2560 2080 1960 1350 420 2410 2010 1840 1280 390 2300 1920 1760 1210...
  • Page 84 MUZ-WX18NL Rated Q(Btu/h): 18000 2) HEATING 1680 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) 25980 22480 19490 12990 6500 3580 27040 23400 20280 13520 6760 3730 28100 24320 21070 14050 7020 3880 2960 1910 2210 1470 410 2810 1810 2100 1400 390 2660 1710 1990 1330...
  • Page 85 MUZ-WX24NL Rated Q(Btu/h): 22400 1) COOLING 2800 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) 20230 20610 15290 10170 5240 5240 19150 19150 14480 9630 4960 4960 18000 17470 13600 9050 4660 4660 3300 3220 2340 1340 380 3110 3110 2210 1270 370 2960 2970 2100 1200...
  • Page 86 MUZ-WX24NL Rated Q(Btu/h): 26000 2) HEATING 2680 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) 32480 32480 24280 16380 8200 7320 33800 33800 25270 17050 8530 7620 35120 35120 26260 17720 8860 7920 3040 3040 2270 1530 680 2890 2890 2150 1450 650 2740 2740 2030 1370...
  • Page 87 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN © Copyright 2024 MITSUBISHI ELECTRIC CORPORATION Issued: Jan. 2025 No. OBD955 REVISED EDITION-A Published: Dec. 2024 No. OBD955 Made in Japan Specifications are subject to change without notice.

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