Black & Decker MUZ-FD12NA- U1, MUZ-FD09NA- U1 service manual

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	No.	Symptom	LED indication	Abnormal point/	Condition	Correspondence
	No.	Symptom	LED indication	Condition	Condition	Correspondence
				Condition
		Outdoor unit	7-time ﬂash	Low discharge tem-	Temperature of discharge temperature thermistor has been	•Refer to 10-5.	"Check of LEV".
	18	operates.	2.5 seconds OFF	perature protection	122 °F (50 °C) or less for 20 minutes.	•Check refrigerant circuit and refrig-
						erant amount.
			8-time ﬂash	PAM protection PAM:	The overcurrent ﬂows into IGBT (Insulated Gate Bipolar tran-	This is not malfunction. PAM protec-
			2.5 seconds OFF	Pulse Amplitude	sistor : TR821) or when the bus-bar voltage reaches 320 V or	tion will be activated in the following
	19			Modulation	more, PAM stops and restarts.	cases;
	19					1 Instantaneous power voltage drop
						(Short time power failure)
						2 When the power supply voltage is
						high.
			9-time ﬂash	Inverter check mode	The connector of compressor is disconnected, inverter check	•Check if the connector of the com-
	20		2.5 seconds OFF		mode starts.	pressor is correctly connected.
	20					Refer to 10-5.	"How to check
						inverter/ compressor".

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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 MUZ-FD12NA Performance Curve CoolingHeating MUZ-FD09NACondensing pressure Condensing Pressure Cooling65 70F MSZ-FD09NA MSZ-FD12NA Standard Operation DataCorrection of Heating capacity Test RUN Operation How to operate fixed-frequency operationOutdoor FAN Motor Control Actuator ControlR.V. Coil Control Relation Between Main Sensor and ActuatorTroubleshooting Service FunctionsChange in Defrost Setting PRE-HEAT Control 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 open phase How to check inverter/ compressorTroubleshooting Flow Check of compressorCheck of compressor winding Check of compressor operation timeCheck of compressor start failure Unit operates Heat mode even if it is set to Cool mode Unit operates Cool mode even if it is set to Heat modeCheck of outdoor thermistors Check of R.V. coilCheck 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 InstructionsPhoto 4 inverter assembly Removing the inverter assembly, inverter P.C. board PhotoPhoto Removing the discharge temperature thermistor Removing R.V. coilRemoving the compressor and 4-way valve Removing outdoor fan motor PhotoPage New publication, effective Jan