Method for controlling the defrosting of refrigerator-freezer un

Details Method for controlling the defrosting of refrigerator-freezer un Method for controlling the defrosting of refrigerator-freezer un

1990-02-27

1991-02-05

Tanner, Harry B.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62156, 62276, F25D 2108

Patent

active

049894137

ABSTRACT:
A method for controlling the defrosting of evaporators provided for refrigerator-freezer units which are cooled by a single compressor. The method includes the steps of forcedly resetting the defrosting timer to its cooling mode after entering defrosting mode after the defrosting of a preset number of evaporators. The remaining undefrosted evaporators are warmed by their remaining heat after the forced resetting, by supplying electric current to their defrosting heaters sooner than the already defrosted evaporators in the next defrosting, by supplying additional electric current to their defrosting heaters after the forced resetting, by accomplishing a complete defrosting in an unsalable mode, by using outside air for defrosting by stopping their outer fans or by additional heating via auxiliary defrosting heaters. The defrosting of all of the evaporators can be performed sufficiently and uniformly, excessive warming of the inside of any unit can be prevented, and the cooling loads after a defrosting mode can be prevented from increasing too much.

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