Heat Controller VMH09SC-1, VMH12SC-1, VMH24SC-1, VMH18SC-1 manual

Service Manual	VMH Series	Heat Controller, Inc.

Defrost Actions:

For 9K and 12K unit

For 18K and 24K unit

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Heat Controller VMH09SC-1, VMH12SC-1, VMH24SC-1, VMH18SC-1 Defrost Actions For 9K and 12K unit For 18K and 24K unit

Contents

Inverter Single Zone Ductless Mini Split Heat Pump Contents Precaution Safety Precaution Installation  For installation, always contact the dealer  Caution  Use two or more people to lift and transport the product  Keep level even when installing the product Operational  Do not block the inlet or outlet of air flow  Do not drink the water drained from the product Function Anti-freeze protection in cooling Outdoor unit Compressor delay Dimension Indoor Unit Model Dimension mm Outdoor Unit Refrigerant Cycle Diagram Indoor Outdoor Wiring Diagrams VMH09SC-1 A-VMH12SC-1 VMH18SC-1 Installation details Pipe length and the elevation Single Zone V Series Inverter System Pressure Test & Evacuation System Evacuation and Charging Operation characteristics Electronic function AbbreviationDisplay function Main Protection Operation Modes and Functions Preheat modeFan only mode Preheat termination Cooling Mode Compressor running rules Frequency decreases Holds Model Current Condenser high temperature T3 protection Outdoor fan rulesIndoor fan running rules Evaporator low temperature T2 protection Heating Mode Compressor running rules T1-Ts-ΔT +5.0 +4.5 +3.5 +3.0 +2.5 +2.0 +1.5 +1.0 +0.5 I1HEAT I2HEAT I3HEAT Outdoor fan running rules VMH12SC-1 Indoor fan rulesUnit TEL0 TEL1 VMH09SC-1 VMH18SC-1 Defrost mode： Defrost Actions For 9K and 12K unit For 18K and 24K unit High evaporator coil temp.T2 protection Auto-mode Dehumidify mode Forced operation function Timer function Sleep function mode Ionizer Clean Air function Auto-Restart functionAutomatic front panel function Troubleshooting Safety Indoor 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 29 P3 Error Low Ambient Protection Inverter compressor drive error diagnosis and solution Key parts checking Position Resistance Value VMH Series Some frequently-used R-T data for T1, T2, T3 and T4 sensor 2012