Refrigeration – Time or program actuator – Defrosting
Patent
1995-03-22
1998-12-01
Tanner, Harry B.
Refrigeration
Time or program actuator
Defrosting
62156, 62155, 62182, 62127, F25B 4702
Patent
active
058423559
ABSTRACT:
A refrigeration controller is provided which thermostatically controls a refrigerated compartment temperature. A heated evaporator is provided within a certain wattage range to accelerate defrosting. The controller maintains the compartment temperature within a certain operating range; if the compartment temperature rises above a certain preselected maximum temperature, the controller activates the compressor and a blower to circulate air over the evaporator to reduce the temperature of the compartment. The controller provides a defrost loop which is periodically activated which controls the compressor, evaporator and heater cycle during defrost. If, during defrost, the evaporator reaches a maximum temperature, or if the food compartment temperature rises above a certain maximum, the heater is deactivated. An evaporator precool loop is provided which activates the compressor without activating the blower, thereby cooling the evaporator before hot air is allowed to circulate in the compartment. The controller is also physically separated from the main circuit board and mounted on a removable modular refrigeration unit, thereby isolating the controller from the main circuit board and protecting it. The invention also provides for reprogramming of the temperature ranges and command defrost and cooling cycles by a remote main circuit board.
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Bennett, deceased Dick C.
Kalis Jeffrey J.
Langer Yury M.
Harrell Rain
Purnell Locke
Rowe International Inc.
Tanner Harry B.
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