Heat Controller VMH18SC-1, VMH12SC-1, VMH24SC-1, VMH09SC-1 service manual Installation details

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Heat Controller, Inc.	VMH Series	Service Manual

A-VMH24SC-1

6. Installation details:

6.1Power Wiring

•Consult local building codes, NEC (National Electrical Code) or CEC (Canadian Electrical Code) for special requirements.

Connection Cable: Voltage drop on the connecting cable should be kept to a minimum. The operating voltage will vary between – 24V to +24V DC.

Use cable size listed below:

MODEL		MIN CKT AMP	AWG (min)
SIZE	POWER SOURCE	MAX FUSE/CB	Connecting Cable**
		AMP	(outdoor to indoor)

9K			14/4
	208/230-60-1	15/20	COPPER
12K	208/230-60-1	15/20	COPPER
			STRANDED
18K			STRANDED

24K

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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  Do not block the inlet or outlet of air flow  Keep level even when installing the product Operational  Use two or more people to lift and transport the product 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 Preheat termination Preheat modeFan only mode Operation Modes and FunctionsCooling 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 I3HEATVMH18SC-1 Indoor fan rulesUnit TEL0 TEL1 VMH09SC-1 VMH12SC-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