Mitsubishi Electronics MUZ-FD09NA Check of compressor winding, Check of compressor operation time

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Measure the resistance between the lead wires at 3 points.

D Check of compressor winding

●Disconnect the connector (CN61) between the compressor and intelligent power module, and measure the resistance between the compressor terminals.

<<Measurement point>> at 3 points

BLK-WHT BLK-RED WHT-RED

<<Judgement>> Refer to 10-4.

0[Ω] ················Abnormal [short] Infinite[Ω] ·······Abnormal [open]

NOTE: Be sure to zero the ohmmeter before measurement.

E Check of compressor operation time

●Connect the compressor and activate the inverter. Then measure the time until the inverter stops due to over current.

<<Operation method>>

Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit.

(TEST RUN OPERATION : Refer to 7-6.) <<Measurement>>

Measure the time from the start of compressor to the stop of compressor due to overcurrent.

F Check of compressor start failure

<<Judgement>>

0 second

1 second

2 seconds

10 seconds

10 minutes

Compressor starts

Abnormal (IPM failure)

(Compressor winding short)

Abnormal (Compressor lock out) (Starting defect)

Abnormal (Poor contact,)

(Outdoor P.C. board defect) (Disconnected connector)

Abnormal

(Refrigerant circuit defect) (Closed valve)

Normal

Confirm that 1~4 is normal.

• Electrical circuit check

1.Contact of the compressor connector (including CN61)

2.Output voltage of inverter P.C. board and balance of them (See 10-5.)

3.Direct current voltage between DB61(+) and (-) on the inverter P.C. board

4.Voltage between outdoor terminal block S1-S2

Does the compressor run for 10 seconds or more after it starts?

No

After the compressor is heated with a drier, does the compressor start? 1

Yes

 

 

Check the refrigerant circuit.

Yes

 

Check the stop valve.

 

 

 

 

 

Replace the compressor.

No

 

1

Compressor start failure. Activate pre-heat control. (Refer to 9-2. "PRE-HEAT CONTROL SETTING")

Heat the compressor with

a drier for about 20 minutes. Do not recover refrigerant gas while heating.

Heating part

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Contents MUZ-FD09NA MUZ-FD09NA- U1 MUZ-FD12NA MUZ-FD12NA- U1 Page Technical Changes Part Names and FunctionsSpecification MUZ-FD09NA MUZ-FD12NATest condition Operating RangeOutlines and Dimensions Required SpaceWiring Diagram Refrigerant System Diagram MAX. Refrigerant Piping Length and MAX. Height DifferenceData Performance Curve Cooling MUZ-FD09NA MUZ-FD12NAHeating MUZ-FD09NACondensing Pressure Cooling Condensing pressure65 70F Standard Operation Data MSZ-FD09NA MSZ-FD12NATest RUN Operation How to operate fixed-frequency operation Correction of Heating capacityActuator Control Outdoor FAN Motor ControlR.V. Coil Control Relation Between Main Sensor and ActuatorService Functions TroubleshootingChange in Defrost Setting PRE-HEAT Control SettingFailure Mode Recall Function OFFOperational procedure Outdoor unit failure mode table Troubleshooting Check Table Page Trouble Criterion of Main Parts MUZ-FD09NAMUZ-FD12NA WHT REDHow to check inverter/ compressor Check of open phaseTroubleshooting Flow Check of compressorCheck of compressor winding Check of compressor operation timeCheck of compressor start failure Unit operates Cool mode even if it is set to Heat mode Unit operates Heat mode even if it is set to Cool modeCheck of outdoor thermistors Check of R.V. coilCheck of power supply Check of outdoor fan motorCheck of LEV Expansion valve Check of inverter P.C. board Emergency OperationPage Electromagnetic noise enters into TV sets or radios Outdoor unitTest Point Diagram and Voltage Inverter P.C. boardDisassembly Instructions Removing the cabinet PhotoRemoving the inverter assembly, inverter P.C. board Photo Photo 4 inverter assemblyPhoto Removing the discharge temperature thermistor Removing R.V. coilRemoving outdoor fan motor Photo Removing the compressor and 4-way valvePage New publication, effective Jan
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MUZ-FD09NA specifications

The Mitsubishi Electronics MUZ-FD09NA is a highly efficient and versatile air conditioning unit designed for both residential and light commercial applications. This model is part of Mitsubishi's advanced range of split-system air conditioners which emphasize energy efficiency, comfort, and innovative technology.

One of the standout features of the MUZ-FD09NA is its energy efficiency. The unit boasts an impressive SEER (Seasonal Energy Efficiency Ratio) rating, which translates to reduced energy consumption and lower utility bills. This makes it an eco-friendly option for users looking to minimize their carbon footprint while enjoying comfortable indoor climates year-round.

The MUZ-FD09NA utilizes advanced inverter technology, which enables the compressor to adjust its speed based on the cooling or heating demand. This not only enhances comfort by maintaining a steady temperature but also significantly reduces energy consumption compared to traditional fixed-speed systems. Additionally, the inverter technology allows for quieter operation, making it ideal for use in bedrooms or study areas where noise can be disruptive.

For air purification, the MUZ-FD09NA is equipped with a high-efficiency filtration system that removes dust, allergens, and other particles from the air. This feature is especially beneficial for individuals with allergies or respiratory issues, ensuring cleaner and healthier indoor air quality.

In terms of user convenience, the unit comes with a user-friendly remote control, allowing for easy adjustment of settings from a distance. Some models may also offer Wi-Fi capability, enabling users to control their air conditioning unit through a smart device, even when away from home.

The MUZ-FD09NA is designed to operate in a wide range of temperatures, making it suitable for various climates. It can effectively provide cooling in the summer and heating in the winter, ensuring comfort throughout the year.

Furthermore, the unit features a compact and sleek design, allowing for easy installation in a variety of spaces without compromising aesthetics.

Overall, the Mitsubishi Electronics MUZ-FD09NA combines energy efficiency, advanced technology, and user-friendly features, making it a reliable choice for maintaining a comfortable indoor environment. Whether for residential or light commercial use, this air conditioning unit stands out as an effective solution for climate control needs.
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