Heat Controller VMH24SC-1, VMH12SC-1, VMH09SC-1, VMH18SC-1 service manual Wiring Diagrams

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Heat Controller, Inc.	VMH Series	Service Manual

5. Wiring Diagrams:

5.1 Indoor Units

B-VMH09SC-1 B-VMH12SC-1

B-VMH18SC-1 B-VMH24SC-1

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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  Operational  Keep level even when installing the product Use two or more people to lift and transport the product  Do not block the inlet or outlet of air flow 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 Fan only mode Preheat modeOperation Modes and Functions Preheat terminationCooling 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 I3HEATUnit TEL0 TEL1 VMH09SC-1 Indoor fan rulesVMH12SC-1 VMH18SC-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