Electrically controlled defrost and expansion valve apparatus

Details Electrically controlled defrost and expansion valve apparatus Electrically controlled defrost and expansion valve apparatus

2006-07-11

2006-07-11

Ali, Mohammad M. (Department: 3744)

Refrigeration

Time or program actuator

Defrosting

Reexamination Certificate

active

07073344

ABSTRACT:
A cooling system that has an electrical controller that controls an electric expansion valve and the defrost cycle using a reversing valve. The need for heater circuit to achieve defrost is eliminated. The system permits the defrosting the evaporator system in less time required for conventional defrost methods. The cooling system also eliminates the need for a head pressure control valve and check valves. Due to the less wiring and lower operating costs, the invention provides significant cost savings.

REFERENCES:
patent: 3633377 (1972-01-01), Quick
patent: 4730662 (1988-03-01), Kobayashi
patent: 4766734 (1988-08-01), Dudley
patent: 5118038 (1992-06-01), Shimizu et al.
patent: 5497629 (1996-03-01), Rafalovich et al.
patent: 5546756 (1996-08-01), Ali
patent: 5755282 (1998-05-01), Teshima et al.
patent: 6334321 (2002-01-01), Said et al.
patent: 7-190574 (1995-07-01), None

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