Demand defrost control method and apparatus

Details Demand defrost control method and apparatus Demand defrost control method and apparatus

F - Mech Eng,Light,Heat,Weapons

25

D

341/4

F25D 21/00 (2006.01) F25B 13/00 (2006.01)

Patent

CA 1325253

Demand Defrost Control Method and Apparatus Abstract A demand defrost controller for a heat pump. The controller compares the temperature of an outdoor heat exchange coil with an enable temperature. A timer is activated when the coil temperature is less than the enable temperature. When the timer senses the compressor has run for a predetermined time the controller checks outdoor and coil temperatures to determine if a defrost cycle of the heat pump should be conducted. A defrost cycle is achieved by reversing refrigerant flow in the heat pump system for a predetermined period or until the outdoor heat exchange coil has been heated to a termination temperature.

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