Refrigerant Cycle Diagram | Heat Controller VMH12SC-1, VMH24SC-1

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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Heat Controller VMH12SC-1, VMH24SC-1, VMH09SC-1, VMH18SC-1 service manual Refrigerant Cycle Diagram, Indoor Outdoor

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 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 Preheat mode Fan only modeOperation Modes and Functions 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 Indoor fan rules Unit TEL0 TEL1 VMH09SC-1VMH12SC-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