Heat Controller VMH18SC-1, VMH12SC-1, VMH24SC-1, VMH09SC-1 service manual VMH Series

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Heat Controller, Inc.	VMH Series	Service Manual

8.3.1. Compressor checking (Model: DA150S1C-20FZ)

Measure the resistance value of each winding by using the multi-meter.

Position	Resistance
	Value
Blue - Red	0.95Ω
Blue - Black	(20℃)
Red - Blue

Outdoor Fan Motor (Model: YDK53-6FB)

Measure the resistance value of each winding by using the multi-meter.

Position	Resistance
	Value
Black - Red	56Ω (20℃)

Red -Yellow	76Ω (20℃)

Outdoor Fan Motor (Model: YDK53-6NB)

Measure the resistance value of each winding by using the multi-meter.

Position	Resistance
	Value
Black - Red	56.5Ω (20℃)

Red -Yellow	117.5Ω (20℃)

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Contents Inverter Single Zone Ductless Mini Split Heat Pump Contents Safety Precaution Precaution Installation  For installation, always contact the dealer  Caution  Do not block the inlet or outlet of air flow  Keep level even when installing the product Operational  Use two or more people to lift and transport the product Do not drink the water drained from the product Anti-freeze protection in cooling FunctionOutdoor unit Compressor delay Indoor Unit DimensionOutdoor Unit Model Dimension mmIndoor Outdoor Refrigerant Cycle DiagramWiring Diagrams VMH09SC-1 A-VMH12SC-1 VMH18SC-1 Installation details Single Zone V Series Inverter System Pipe length and the elevationSystem Evacuation and Charging Pressure Test & EvacuationOperation characteristics Abbreviation Electronic functionDisplay function Main Protection Preheat termination Preheat modeFan only mode Operation Modes and FunctionsCooling Mode Compressor running rules Model Current Frequency decreases HoldsOutdoor fan rules Condenser high temperature T3 protectionIndoor fan running rules Heating Mode Compressor running rules Evaporator low temperature T2 protectionT1-Ts-ΔT +5.0 +4.5 +3.5 +3.0 +2.5 +2.0 +1.5 +1.0 +0.5 Outdoor fan running rules I1HEAT I2HEAT I3HEATVMH18SC-1 Indoor fan rulesUnit TEL0 TEL1 VMH09SC-1 VMH12SC-1Defrost mode： Defrost Actions For 9K and 12K unit For 18K and 24K unit Auto-mode High evaporator coil temp.T2 protectionForced operation function Dehumidify modeSleep function mode Timer functionAuto-Restart function Ionizer Clean Air functionAutomatic front panel function Safety TroubleshootingDiagnosis and Solution Indoor Unit Error DisplayEeprom parameter error diagnosis and solution VMH Series E3 Indoor or E7 Outdoor Igbt over current protection diagnosis and solution VMH Series Inverter compressor drive error diagnosis and solution 29 P3 Error Low Ambient ProtectionPosition Resistance Value Key parts checkingVMH Series Some frequently-used R-T data for T1, T2, T3 and T4 sensor 2012