Defrost control for variable speed heat pumps

Details Defrost control for variable speed heat pumps Defrost control for variable speed heat pumps

1986-12-04

1988-06-21

Tanner, Harry B.

Refrigeration

Time or program actuator

Defrosting

62156, 62155, F25D 2106

Patent

active

047518251

ABSTRACT:
An adaptive defrost system for a heat pump wherein the time-between-defrosts is continuously updated by multiplying the last time-between-defrosts by a ratio of the desired and actual differences between the pre-defrost and after-defrost saturated coil temperatures. A single thermistor is used for both pre and after-defrost measurements such that no calibration is required.

REFERENCES:
patent: 4251988 (1981-02-01), Allard et al.
patent: 4373349 (1983-02-01), Mueller
patent: 4417452 (1983-11-01), Ruminsky et al.
patent: 4573326 (1986-03-01), Sulfstede et al.
patent: 4590771 (1986-05-01), Shaffer et al.

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