Heat Controller VMH24SC-1, VMH12SC-1, VMH09SC-1, VMH18SC-1 Outdoor unit Compressor delay

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Heat Controller, Inc.	VMH Series	Service Manual

Outdoor unit

Compressor delay

3 minute time delay between ON/OFF operation.

Low noise air flow system

Bird tail propeller fan makes the outdoor unit run more quietly.

Hydrophilic aluminum fin

4 way valve control

Energized in the heating mode except when in defrost.

Anti-rust cabinet

Made from electrolytic zinc steel and anti-rust coated components.

Valve protection cover

Protects the valves and prevents water from dripping.

Discharge pipe temperature protection

Crankcase heater chassis heater for some full DC inverter outdoor units

Operates down to 5°F(15°C)

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Contents Inverter Single Zone Ductless Mini Split Heat Pump Contents Precaution Safety 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 Electronic function AbbreviationDisplay function Main Protection Fan only mode Preheat modeOperation Modes and Functions Preheat terminationCooling Mode Compressor running rules Model Current Frequency decreases HoldsCondenser high temperature T3 protection Outdoor fan rulesIndoor 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 functionIonizer Clean Air function Auto-Restart functionAutomatic front panel function Safety TroubleshootingIndoor Unit Error Display Diagnosis and SolutionEeprom 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