Heat Controller VMH12SC-1 Indoor fan rules, Unit TEL0 TEL1 VMH09SC-1, VMH18SC-1, VMH24SC-1

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Service Manual	VMH Series	Heat Controller, Inc.

8.4.3.3 Indoor fan rules:

The indoor fan speed can be selected as high, medium, low and auto, the anti-cold-wind function has the priority.

If set temperature is reached, the indoor fan switches to lowest speed, the anti-cold wind function has priority.

If operation mode is changed or compressor restarts, indoor fan works in set fan speed. Anti-cold-wind function control principle:

T2

°F °C

111 (44)

100 (38)

99 (37)

93(34)

91(33)

(TEL1)

(TEL0)

Unit		TEL0 (℃)	TEL1 (℃)
	VMH09SC-1	63°F/17°C	75°F/24°C
	VMH12SC-1	63°F/17°C	75°F/24°C
	VMH12SC-1

T2

°F °C

111 (44)

100 (38)

99 (37)

93(34)

91(33)

(TEL0)

	Unit	TEL0 (℃)
	VMH18SC-1	75°F/24°C
	VMH24SC-1	75°F/24°C
	VMH24SC-1

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Contents Inverter Single Zone Ductless Mini Split Heat Pump Contents Safety Precaution 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 Abbreviation Electronic functionDisplay function Main Protection Preheat mode Fan only modeOperation Modes and Functions Preheat terminationCooling Mode Compressor running rules Frequency decreases Holds Model CurrentOutdoor fan rules Condenser high temperature T3 protectionIndoor 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 modeAuto-Restart function Ionizer Clean Air functionAutomatic front panel function Troubleshooting SafetyDiagnosis and Solution Indoor Unit Error DisplayEeprom 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