Heat pump system defrost control

Details Heat pump system defrost control Heat pump system defrost control

1978-10-24

1980-07-01

Wayner, William E.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62156, 62209, 62234, F25D 2106, F25B 4100

Patent

active

042099943

ABSTRACT:
A control system for a reverse cycle refrigeration system for controlling the defrosting of the outdoor coil thereof on a cost effective basis; the control system comprising a controller means receiving inputs indicative of the outdoor air temperature, the temperature of the outdoor coil, and the operation of the compressor means; the controller means having a timing function which is initiated upon the outdoor coil temperature being at or below a preselected value and the compressor means being operated; the duration of the timing function being determined on a substantially continuous basis as a function of the magnitude of the outdoor air temperature; and the controller means having an operative connection to the system so as to, upon completion of the timing function, place the reverse cycle refrigeration system into an outdoor coil defrost mode of operation.

REFERENCES:
patent: 3126712 (1964-03-01), Gebert
patent: 3170304 (1965-02-01), Hale
patent: 3170305 (1965-02-01), Dibble et al.
patent: 3400553 (1968-09-01), Orbesen
patent: 3460352 (1969-08-01), Lorenz
patent: 3759049 (1973-09-01), Bell et al.
patent: 3854915 (1974-12-01), Schulze-Berge et al.

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