Comfort-Aire B-VFH18MA-1 - Manual (Page 12)

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VFH InverterFlex ® - Indoor Ductless Mini-Split Heat Controller
Cooling operation
Principle:
• Air conditioners absorb heat in the room and transmit it to the outdoor unit, so that the room
temperature decreases. The cooling capacity will increase or decrease according to outdoor
ambient temperature.
Antifreeze Function:
• If the unit is operating in COOL mode and in low ambient temperatures, frost may form on the
heat exchanger. When indoor heat exchanger temperature decreases below zero, compressor
will stop operation to protect the unit.
Heating operation
Principle:
• Air conditioners absorb heat from outdoors and transmit it to the indoor unit, increasing room
temperature. The heating capacity will decrease in low ambient temperatures.
Defrosting:
• When outdoor temperature is low but humidity is high, frost may form on the outdoor unit during
extended operation, affecting heating efficiency. The air conditioner may stop operation during
auto defrosting operation.
• During auto defrosting, the fan motors of indoor unit and outdoor unit will stop.
• During defrosting, the indoor unit heating indicator flashes and the outdoor unit may emit vapor.
This is normal during defrost mode.
• After defrosting is finished, the heating operation will restart automatically.
Ant-cold Air Function:
• In HEAT mode, the indoor fan will not operate for approximately 2 minutes in order to prevent
cold air blowing out until the unit is ready to heat.
Residual Heat Removal:
1. In HEAT mode, once the room temperature reaches the set point, the compressor stops and
the indoor fan still run for 60s, to remove any residual heat from the refrigerant circuit.
2. In HEAT mode, if you turn off the unit, the compressor stops and the indoor fan still runs for 10s
to remove residual heat from the refrigerant circuit.
Operation Tips