Demand defrost control method and apparatus

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

1987-07-17

1989-11-28

Ford, John

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62156, 62234, 165 17, 165 29, F25D 2106

Patent

active

048829080

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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