Mitsubishi Electric M Series Service Manual
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Mitsubishi Electric M Series Service Manual

Mitsubishi Electric M Series Service Manual

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M-SERIES
Air Conditioners
SVZ-AP12,18, 24, 30, 36NL*
SERVICE MANUAL
For use with R454B

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  • Page 1 M-SERIES Air Conditioners SVZ-AP12,18, 24, 30, 36NL* SERVICE MANUAL For use with R454B...

  • Page 2: Table Of Contents

    13.6. Trouble criterion of main parts ..................78 13.7. Thermistor ........................ 80 13.8. DC Fan motor (fan motor/indoor controller board) ............81 13.8.1. DC Fan motor measuring points ..............82 Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 3 14.5. Refrigerant leak sensor ....................88 15. Appendix A: Quick reference worksheet (minimum room area requirement) ......92 16. Appendix B - High altitude applications - capacity reduction factors ......... 96 Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 4: Safety Precautions

    Service personnel are required to carefully read the OPERATING INSTRUCTIONS and INSTALLATION MANUAL before operation. Further information is available in the OPERATING INSTRUCTIONS, INSTALLATION MANUAL, and the like. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 5: Cautions For Service

    Perform service after recovering the refrigerant left in unit completely. Do not release refrigerant in the air. After completing service, charge the cycle with specified amount of refrigerant. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 6: Warning For Service

    17. Pipe-work shall be protected from physical damage. 18. The installation of pipe-work shall be kept to a minimum. 19. Compliance with national gas regulations shall be observed. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 7: Additional Refrigerant Charge

    Check that cylinder for R454B available on the market is a siphon type. Charging should be performed with the cylinder of siphon stood vertically. (Refrigerant is charged from liquid phase.) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 8: Service Tools

    • Attach on vacuum pump. Adapter for reverse flow check ⑥ Refrigerant charge base ⑦ Refrigerant cylinder • Only for R454B • Cylinder with siphon ⑧ Refrigerant recovery equipment Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 9: Refrigerant R454B

    – Verify any person performing work near where flammable refrigerant is used is properly informed prior to work commencing of the risks and safety precautions associated with flammable refrigerant and the nature of the work being done. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 10: Precautions For Devices That Use R454B

    – Markings and labels on the equipment must remain legible. Correct all labels or service markings that are illegible. Labels and service markings contain information that is critical to the next service technician Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 11 – Recover refrigerant via the outdoor unit service ports only. Do not vent refrigerant. Always follow the decommissioning procedure. – Do not pierce or burn. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 12: Installation Of R454B System

    – Verify all field pipe joints are vacuum tested prior to refrigerant charging. ◦ Verify all indoor field-made joints are tightness tested with 0.25 times the MAXIMUM ALLOWABLE PRESSURE, with NO LEAK DETECTED. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 13: Safety Checks For Systems Using R454B

    IMPORTANT Approved electric heater kits manufactured for Mitsubishi Electric US, Inc. includes electric heat kits manufactured for Mitsubishi Electric US, Inc. that are allowed for use with the listed air handlers. These tables are found in the chapter Indoor unit accessories found in the Installation manual.
  • Page 14 • Check the cables for effects of aging or • Verify the casing is not altered in any manner continual vibration from sources such as that affects protection. compressors or fans. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 15: Minimum Floor And Conditioned Space Area Requirements

    (i.e. tiles and carpet pile). • Enhanced tightness refrigeration systems (ETRS) are approved for fixed Anv requirements. – Almost every combination of Mitsubishi Electric US, Inc. indoor unit / outdoor unit are considered an enhanced tightness refrigeration system (ETRS).
  • Page 16 < 1m (3 ft 3 3/8 in) Case C NOTE For systems certified as ETRS the following ventilation requirement can be substituted: A nvETRS ⩾ 114cm 2 or 22in 2 Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 17 9 [96] 6 [64] 3 [32] 0 [0] [2.2] [4.4] [6.6] [8.8] [11] [13.2] [15.4] [17.6] [19.8] [22] [24.2] [26.4] [28.6] [30.8] [33] Planned System Charge (kg) [lbs] Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 18 Additional space/ventilation is required 8.5 [91] 8 [86] [2.2] [4.4] [6.6] [8.8] [11] [13.2] [15.4] [17.6] [19.8] [22] [24.2] [26.4] [28.6] [30.8] [33] Planned System Charge (kg) [lbs] Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 19: Handling And Service Of R454B System

    Purge the circuit with inert gas. Evacuate Continuously flush or purge with inert gas when using a flame to solder or de-solder. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 20: Purging The System With R454B

    • Pressure test the system prior to re-charging with appropriate purging gas. • Leak test the system at completion of charge, prior to commissioning, and before leaving the worksite. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 21: Recovery Of R454B

    The indoor unit fan motor activates to provide circulation airflow. This process puts stress on system components, so testing should occur only when required, such as during system commissioning, or when advised by Mitsubishi Electric US, Inc. service personnel, or when required by local codes and regulations.

  • Page 22: Testing Procedure

    Verify cylinder is situated on the scales before recovery takes place. Start the recovery machine and operate in accordance with instructions. • Do not overfill cylinders (no more than 80 % volume liquid charge). Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 23: Disposal Of R454B

    2.6. Disposal of R454B Recover the refrigerant and recycle it. If recycling is not possible then it should be incinerated by a licensed facility. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 24: Specifications

    Units should be installed by a licensed HVAC and / or electrical contractor according to local and state code requirements. For outdoor units to be connected, refer to the Installation manual that comes with the units. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 25 67 °F [19.4 °C] D.B. Lower limit 57 °F [13.9 °C] W.B. Upper limit 80 °F [26.7 °C] D.B. Heating Lower limit 70 °F [21.1 °C] D.B. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 26: Part Names And Functions

    SVZ-AP12,18, 24, 30, 36NL* 4. Part Names and Functions Indoor unit Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 27: Fan Performance And Corrected Airflow

    For downflow fan performance and corrected airflow, please see downflow kit manuals. Table 1. Model code 12 Vertical, Horizontal right, Horizontal left, exclude Downflow position External static pressure: 75Pa, 0.30 [in. WG], Power source: 208/230 V, 60Hz Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 28 External static pressure: 125Pa, 0.50 [in. WG], Power source: 208/230 V, 60Hz Airflow rate (m3/min) Airflow rate (CFM) External static pressure: 200Pa, 0.80 [in. WG], Power source: 208/230 V, 60Hz Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 29 External static pressure: 75Pa, 0.30 [in. WG], Power source: 208/230 V, 60Hz External static pressure: 125Pa, 0.50 [in. WG], Power source: 208/230 V, 60Hz Airflow rate (m3/min) Airflow rate (CFM) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 30 External static pressure: 200Pa, 0.80 [in. WG], Power source: 208/230 V, 60Hz Table 3. Model code 24 Vertical, Horizontal right, Horizontal left, exclude Downflow position External static pressure: 75Pa, 0.30 [in. WG], Power source: 208/230 V, 60Hz Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 31 External static pressure: 125Pa, 0.50 [in. WG], Power source: 208/230 V, 60Hz Airflow rate (m3/min) Airflow rate (CFM) External static pressure: 200Pa, 0.80 [in. WG], Power source: 208/230 V, 60Hz Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 32 External static pressure: 75Pa, 0.30 [in. WG], Power source: 208/230 V, 60Hz External static pressure: 125Pa, 0.50 [in. WG], Power source: 208/230 V, 60Hz 1000 Airflow rate (m3/min) Airflow rate (CFM) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 33 External static pressure: 200Pa, 0.80 [in. WG], Power source: 208/230 V, 60Hz Table 5. Model code 36 Vertical, Horizontal right, Horizontal left, exclude Downflow position External static pressure: 75Pa, 0.30 [in. WG], Power source: 208/230 V, 60Hz Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 34 External static pressure: 125Pa, 0.50 [in. WG], Power source: 208/230 V, 60Hz Airflow rate (m3/min) Airflow rate (CFM) External static pressure: 200Pa, 0.80 [in. WG], Power source: 208/230 V, 60Hz Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 35 SVZ-AP12,18, 24, 30, 36NL* Air filter [0.100] [0.080] 30,36 [0.060] 12, 18, 24 [0.040] [0.020] [353] [706] [1059] [1412] [1766] Airflow rate (m /min)[cfm] Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 36: Sound Pressure Levels

    SVZ-AP12,18, 24, 30, 36NL* 6. Sound Pressure Levels 6.1. Sound pressure level Multi-Position Aux.duct Front side 3-1/4ft. (1m) Measurement location Aux.duct Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 37: Nc Curves

    Table 6. Model code 12, External static pressure 0.30, 0.50, 0.80 in WG (75, 125, 200 Pa). External static pressure 0.30 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 38 SVZ-AP12,18, 24, 30, 36NL* External static pressure 0.50 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 39 SVZ-AP12,18, 24, 30, 36NL* External static pressure 0.80 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 40 Table 7. Model code 18, External static pressure 0.30, 0.50, 0.80 in WG (75, 125, 200 Pa). External static pressure 0.30 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 41 SVZ-AP12,18, 24, 30, 36NL* External static pressure 0.50 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 42 SVZ-AP12,18, 24, 30, 36NL* External static pressure 0.80 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 43 Table 8. Model code 24, External static pressure 0.30, 0.50, 0.80 in WG (75, 125, 200 Pa). External static pressure 0.30 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 44 SVZ-AP12,18, 24, 30, 36NL* External static pressure 0.50 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 45 SVZ-AP12,18, 24, 30, 36NL* External static pressure 0.80 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 46 Table 9. Model code 30, External static pressure 0.30, 0.50, 0.80 in WG (75, 125, 200 Pa). External static pressure 0.30 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 47 SVZ-AP12,18, 24, 30, 36NL* External static pressure 0.50 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 48 SVZ-AP12,18, 24, 30, 36NL* External static pressure 0.80 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 49 Table 10. Model code 36, External static pressure 0.30, 0.50, 0.80 in WG (75, 125, 200 Pa). External static pressure 0.30 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 50 SVZ-AP12,18, 24, 30, 36NL* External static pressure 0.50 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 51 SVZ-AP12,18, 24, 30, 36NL* External static pressure 0.80 NC-70 NC-70 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise Octave band centrer frequencies (Hz) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 52: Dimensions

    SVZ-AP12,18, 24, 30, 36NL* 7. Dimensions Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 53 (17) (14-13/16) (11-1/8) (8-7/8) 382.6 266.5 (21) (18-13/16) (15-1/8) (10-1/2) Model code 1,010.8 735.5 (39-13/16) (26-13/16) (32-7/16) (29) (14-3/16) 1,113.8 935.5 (43-7/8) (19-1/16) (37-9/16) (31-3/16) (18-3/16) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 54: Outlines

    SVZ-AP12,18, 24, 30, 36NL* 7.1. Outlines Unit:mm(in.) Clearance Area Length of Unit Width of Unit Vertical Installation Horizontal Installation Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 55: Wiring Diagram

    FAN MOTOR CN24 CN24A FUSE AC250V 6.3A ZNR01, 02, 03 SA001 AC REACTOR (POWER FACTOR IMPROVEMENT) CNDB CONNECTOR (DIODE BRIDGE) DIODE BRIDGE 210 mm Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 56 2.Indoor and outdoor connecting wires are made with polarities, make wiring matching terminal numbers (S1, S2, S3). Specifications are subject to change without notice. 3.Symbols used in wiring diagram above are © 2025 Mitsubishi Electric US, Inc. as follows.

  • Page 57: Refrigerant System Diagram

    Refrigerant flow in cooling Refrigerant flow in heating Thermistor TH2 Pipe temperature(Liquid) Refrigerant LIQUID pipe connection (Flare) Thermistor TH1 (Return Air temperature) Strainer (#50) Distributor with strainer (#50) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 58: Heater Control

    When using the SPTB1 accessory, take special care when restarting power to the system to ensure that both the indoor unit and outdoor unit are powered up at the same time to avoid triggering a communication error. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 59 Time delay can only be selected with MA controller. If use of a non-MA controller is desired, the time delay must first be selected with the MA controller. Then the non-MA controller can be attached and used. All delay times are approximate. The default time delay setting is 20 minutes. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 60 ) > 2.7 °F [1.5 °C] not increasing faster than 0.9 °F [0.5°C] in 7 min EH2 ON EH1 OFF ⑥ ) < 0.9 °F [0.5°C] EH2 OFF Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 61: Fan Control

    When using the SPTB1 accessory, take special care when restarting power to the system to ensure that both the indoor unit and outdoor unit are powered up at the same time to avoid triggering a communication error. Factory setting Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 62: Cn24Relay-Kit-Cm3 (Optional Parts) Installation

    - This connector is used to perform an interlocked operation with a panel heater. Depending on the indoor unit control board specification, connect the cable to CN2Y as appropriate. CN2Y for FAN control (CN24RELAY-KIT-CM3) Wiring: A basic connection method is shown below. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 63 • Keep the length of the cable connecting to the circuit board of the indoor unit shorter than 10 meters (32 ft). • Longer than 10 meters (32 ft) could cause improper operation. • Use a transit relay when extending wiring such as remote wiring. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 64: Humidifier

    Factory setting Remote controller Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 65: Erv (Energy Recovery Ventilation)

    If ERV control is effective when STOP, IDU doesn’t report fan status or PB error (Fan motor error). When fan speed setting by RC is "Auto", Fan speed is fixed to "HIGH". Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 66: Troubleshooting

    When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. Lead wires 13.2. Self-check Refer to the installation manual that comes with each remote controller for details. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 67 / current sensor error Refrigerant leakage or Refrigerant leak sensor error caused by other rooms Others Other errors (refer to the technical manual for the outdoor unit) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 68: Auto Restart Function

    13.2.2. Function table Mode Setting Default Mode Settings (function) setting Not available Power failure auto restart Available Indoor Indoor unit operating average temperature Indoor unit’s internal sensor detect Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 69 Installers are strongly advised never to physically uninstall a wired controller while the system is running. In addition to the safety concerns, this practice can also trigger a remote controller communication error. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 70: Self-Diagnosis Action Table

    Replace indoor controller board if there is abnormal difference with actual room temperature. Turn the power off, and on again to operate after check. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 71 • Indoor controller board is defective. Defective outdoor fan control Overcharge of refrigerant 7 Defective refrigerant circuit (clogs) Bypass circuit of outdoor unit is defective Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 72 3) It takes at least 27 minutes to detect abnormality. 4) It excludes the period of defrosting (Detection restarts when defrosting mode is over) Heating range : 3˚C(5.4˚F) [ (TH5-TH1) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 73 [ c),d)→Noise may be causing abnormality. ] ∗ If the unit is not normal after replacing indoor controller board in group control, indoor controller board of address “0” may be abnormal. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 74 • Check the conection of parts such as connectors and turn the power on again. • If the error does not clear, replace the Refrigerant leak sensor. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 75 When the number of rotations is detected to be Replace the failed motor. Motor failure above the upper limit for 30 seconds. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 76: Troubleshooting By Inferior Phenomena

    Defective remote controller if LED 2 is blinking, remote controller is defective; if LED 2 is lit, connection failure of remote controller terminal block etc. has returned to normal. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 77: Test Point Diagram

    Indoor controller board C351 (* 1 ) C084 (* 1 ) PC352 (* 1 ) CN20 �CN3C CN2Y CN44 CNSA CN24A CN4F CN51 CN25 CN24 CN2L CN105 CNSC CN485 Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 78: Trouble Criterion Of Main Parts

    Measure the resistance with a tester. (Part temperature 10C (50F) ~ 30C (86F)) Pipe temperature thermistor / liquid (TH2) Normal Abnormal Condenser / evaporator 4.3k~9.6k Opened or short-circuited temperature thermistor (TH5) Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 79 After turning off the indoor unit breaker and leaving it for 5 minutes, measure the resistance value between the sensor terminals. Back side of the sensor Measure the both sides of the sensor pin. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 80: Thermistor

    (˚C) -20 -10 0 10 20 30 40 50 30°C (86°F) 4.3 k" ˚F -4 14 32 50 68 86 104 122 40°C (104°F) 3.0 k" Temperature Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 81: Dc Fan Motor (Fan Motor/Indoor Controller Board)

    Replace the fan motor. of connector CNMF repeat 0V and 5V? Check the operation of fan. Check the operation of fan. Replace indoor controller board. Replace indoor controller board. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 82: Dc Fan Motor Measuring Points

    Jumper Functions Setting by the dip switch and jumper Remarks wire wire Model settings for service board Capacity settings Model code Service Board Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 83 3 ~ 9 in the table indicates the jumper line is disconnected. : Short : Open : Short : Open Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 84: Disassembly Procedure

    2. Return air thermistor is located as shown in the image inside the control box and is connected to the control board on CN20. Return Air Thermistor Wire Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 85: Coil Assembly

    2. Remove the Coil panel by removing all of the screws securing it to the (3) smaller panels for refrigerant and drain lines. 3. Slide the smaller panels in the directions indicated and re- move. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 86 Next, slide the coil from the frame. 5. Remove the plate covering the coil assembly to access the thermistors and Refrigerant leak sensor. 6. Remove lower and side drain pan. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 87: Blower/Fan Assembly

    4. Remove the (2) screws that secure the control box and then remove the control box. 5. Remove coil panel and smaller drain panel. 6. Remove the (2) screws that secure the fan assembly and slide out. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 88: Refrigerant Leak Sensor

    Step. 3a Remove the screws securing the (3) panels to the COIL panel shown in the !µ image above. Remove the “1st” panel and “2nd” panel marked “COIL”. ; ; e ; ; f ; fT fT fT c a � l Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 89 Step. 3b Next, remove the smaller panels covering the drain holes and refrigerant lines by first sliding in the directions indicated above. Step. 4 Remove the screws (4) and front plate from the coil assembly. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 90 • Gently apply pressure against the back of the sensor housing assembly to re- lease it from the bracket. DETAIL ↑ • Once it has released, remove the brack- et by hand. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 91 *REFRIGERANT LEAK SENSOR REMOVED FOR BRACKET INSTALLATION CLARITY NOTE Route the refrigerant leak sensor wire be- tween then sensor bracket and the refrig- erant leak sensor housing (as shown in the image above). Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 92: Appendix A: Quick Reference Worksheet (Minimum Room Area Requirement)

    *. In the top row, find the column that describes the correct Case (chosen in Step. 4) and the ODU installed, mark this column with an *. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 93 • Yes or No (circle one) If A and B are YES, then proceed with installation. If A and/or B are NO, then additional area, ventilation, or installation height required. Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 94 10.5 [113.1] 10.5 [113.1] 94.6 [1018.3] 43 [462.9] 22.9 [246.5] 10.5 [113.1] 14.4 [31.7] 44.3 [476.9] 44.3 [476.9] 10.7 [115.2] 10.7 [115.2] 97.3 [1047.4] 44.3 [476.9] 23.5 [253] 10.7 [115.2] Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 95 38.2 [411.2] 10.5 [113.1] 43 [462.9] 43 [462.9] 10.5 [113.1] 10.5 [113.1] 14.4 [31.7] 162.2 [1746] 44.3 [476.9] 39.1 [420.9] 10.7 [115.2] 44.3 [476.9] 44.3 [476.9] 10.7 [115.2] 10.7 [115.2] Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

  • Page 96: Appendix B - High Altitude Applications - Capacity Reduction Factors

    2,000 0.93 0.98 3,000 0.90 0.98 4,000 0.86 0.97 5,000 0.83 0.96 6,000 0.80 0.95 7,000 0.77 0.94 8,000 0.74 0.94 9,000 0.71 0.93 10,000 0.69 0.92 Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.
  • Page 97 This product is designed and intended for use in the residential, commercial and light-industrial environment. MITSUBISHI ELECTRIC US, INC. Toll Free: 800-433-4822 MEUS DOC# MD-2325-K007 Ver.1, February 2025 Specifications are subject to change without notice. © 2025 Mitsubishi Electric US, Inc.

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