Mitsubishi Electronics MUZ-FD09NA, MUZ-FD12NA Check of inverter P.C. board, Emergency Operation

Page 28

L Check of inverter P.C. board

Check the outdoor fan motor. (Refer to10-5..)

Is the fuse (F901) blown on the in- verter P.C. board?

Check the connection of the connectors (CN932) of the outdoor fan motor.

If the connection is poor, make it correct.

Operate the outdoor unit by starting

EMERGENCY OPERATION.

Check the LED indication on the in- verter P.C. board.

Does the LED ﬂash 10 times?

Yes

(10-time ﬂash)

Replace the inverter P.C. board.

	Yes
		Inverter P.C. board
		(Solder side)
		CN932
		Check the corresponding parts
	No	following LED indication.
	No	(Refer to 10-3.)
		(Refer to 10-3.)

Image 28

Contents MUZ-FD09NA MUZ-FD09NA- U1 MUZ-FD12NA MUZ-FD12NA- U1 Specification has been corrected Technical Changes Part Names and FunctionsSpecification MUZ-FD09NA MUZ-FD12NATest condition Operating RangeOutlines and Dimensions Required SpaceWiring Diagram Refrigerant System Diagram UnitinchData Performance Curve Cooling MUZ-FD09NAHeating MUZ-FD12NACondensing Pressure Cooling Condensing pressure65 70F Standard Operation Data MSZ-FD09NA MSZ-FD12NATest RUN Operation How to operate fixed-frequency operation Actuator 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 Operational procedure Outdoor unit failure mode table Troubleshooting Check Table Page Trouble Criterion of Main Parts MUZ-FD09NAMUZ-FD12NA BLK WHT WHT REDHow to check inverter/compressor Check of open phaseTroubleshooting Flow Check of compressorCheck of compressor operation time Check of compressor windingCheck 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 OperationHow to check miswiring and serial signal error 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 Made in Japan

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MUZ-FD09NA- U1, MUZ-FD12NA- U1, MUZ-FD12NA, 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.

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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.