Heat Controller VMH12SC-1, VMH24SC-1, VMH09SC-1 Refrigerant Cycle Diagram, Indoor Outdoor

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Service Manual	VMH Series	Heat Controller, Inc.

4. Refrigerant Cycle Diagram:

INDOOR

OUTDOOR

HEAT EXCHANGE (EVAPORATOR)

LIQUID SIDE

2-WAY VALVE

GAS SIDE

CHECK VALVE (Heating Model only)

CAPILIARY TUBE

HEAT EXCHANGE (CONDENSER)

3-WAY VALVE	REVERSING VALVE
ACCUMULATOR	(Heating Model only)
ACCUMULATOR
	COOLING
COMPRESSOR	HEATING

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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  Keep level even when installing the product  Operational 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 Function Anti-freeze protection in coolingOutdoor unit Compressor delay Dimension Indoor UnitModel Dimension mm Outdoor UnitRefrigerant Cycle Diagram Indoor OutdoorWiring Diagrams VMH09SC-1 A-VMH12SC-1 VMH18SC-1 Installation details Pipe length and the elevation Single Zone V Series Inverter SystemPressure Test & Evacuation System Evacuation and ChargingOperation characteristics Electronic function AbbreviationDisplay function Main Protection Preheat mode Fan only modeOperation Modes and Functions Preheat terminationCooling Mode Compressor running rules Frequency decreases Holds Model CurrentCondenser high temperature T3 protection Outdoor fan rulesIndoor fan running rules Evaporator low temperature T2 protection Heating Mode Compressor running rulesT1-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 rulesIndoor fan rules Unit TEL0 TEL1 VMH09SC-1VMH12SC-1 VMH18SC-1Defrost mode： Defrost Actions For 9K and 12K unit For 18K and 24K unit High evaporator coil temp.T2 protection Auto-modeDehumidify mode Forced operation functionTimer function Sleep function modeIonizer Clean Air function Auto-Restart functionAutomatic front panel function Troubleshooting SafetyIndoor 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 solutionKey parts checking Position Resistance ValueVMH Series Some frequently-used R-T data for T1, T2, T3 and T4 sensor 2012