Black & Decker MUZ-FD12NA- U1, MUZ-FD09NA- U1 service manual Check of LEV Expansion valve

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Heating/Cooling does not work sufficiently.

K Check of LEV (Expansion valve)

Turn ON the power supply. <Preparation of the remote controller>

While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button.

First, release RESET button.

And release the other two buttons after all LCD except the set temperature in operation display ection of the remote controller is displayed after 3 seconds.

Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 1

Expansion valve operates in full-opening direction.

Do you hear the expansion valve "click,

 

 

 

click·······"?

 

 

 

 

 

OK.

Do you feel the expansion valve vibrate

Yes

 

on touching it ?

 

 

 

 

No

 

 

 

1. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received.

Is LEV coil properly fixed to the expansion valve?

Yes

Does the resistance of LEV coil have the characteristics? (Refer to 10-4.)

No

Replace the LEV coil.

No

Yes

Properly fix the LEV coil to the expansion valve.

Measure each voltage between connector pins of CN724 on the inverter P.C. board. 1.Pin(-) — Pin(+)

2.Pin(-) — Pin(+) 3.Pin(-) — Pin(+) 4.Pin(-) — Pin(+)

Is there about 3 ~ 5 VAC between each? NOTE: Measure the voltage by an analog

tester.

Yes

Replace the expansion valve.

Replace the inverter P.C. No board.

NOTE : After check of LEV, do the undermentioned operations.

1.Turn OFF the power supply and turn ON it again.

2.Press RESET button on the remote controller.

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Contents MUZ-FD09NA MUZ-FD09NA- U1 MUZ-FD12NA MUZ-FD12NA- U1 Page Part Names and Functions Technical ChangesMUZ-FD09NA MUZ-FD12NA SpecificationOperating Range Test conditionRequired Space Outlines and DimensionsWiring Diagram MAX. Refrigerant Piping Length and MAX. Height Difference Refrigerant System DiagramData MUZ-FD09NA Performance Curve CoolingMUZ-FD09NA MUZ-FD12NA HeatingCondensing pressure Condensing Pressure Cooling65 70F MSZ-FD09NA MSZ-FD12NA Standard Operation DataCorrection of Heating capacity Test RUN Operation How to operate fixed-frequency operationRelation Between Main Sensor and Actuator Actuator ControlOutdoor FAN Motor Control R.V. Coil ControlPRE-HEAT Control Setting Service FunctionsTroubleshooting Change in Defrost SettingOFF Failure Mode Recall FunctionOperational procedure Outdoor unit failure mode table Troubleshooting Check Table Page WHT RED Trouble Criterion of Main Parts MUZ-FD09NAMUZ-FD12NACheck of compressor How to check inverter/ compressorCheck of open phase Troubleshooting FlowCheck of compressor winding Check of compressor operation timeCheck of compressor start failure Check of R.V. coil Unit operates Cool mode even if it is set to Heat modeUnit operates Heat mode even if it is set to Cool mode Check of outdoor thermistorsCheck of outdoor fan motor Check of power supplyCheck of LEV Expansion valve Emergency Operation Check of inverter P.C. boardPage Outdoor unit Electromagnetic noise enters into TV sets or radiosInverter P.C. board Test Point Diagram and VoltageRemoving the cabinet Photo Disassembly InstructionsRemoving R.V. coil Removing the inverter assembly, inverter P.C. board PhotoPhoto 4 inverter assembly Photo Removing the discharge temperature thermistorRemoving the compressor and 4-way valve Removing outdoor fan motor PhotoPage New publication, effective Jan