Refrigeration system having periodic flush cycles

Details Refrigeration system having periodic flush cycles Refrigeration system having periodic flush cycles

1986-06-30

1987-10-06

Tanner, Harry

Refrigeration

Automatic control

Refrigeration producer

62157, 62192, F25B 4104, F25B 3100

Patent

active

046974318

ABSTRACT:
A microprocessor controlled system for use in a refrigeration system which includes a plurality of pulse controlled solenoid flow control valves suitable for use as expansion valves is disclosed. A pulse width modulated control signal is generated for cyclically opening and closing the flow through the solenoid expansion valve. The duty cycle of the pulsed control signal determines the average flow rate through the valve. The microprocessor controls, periodically, the opening of each expansion valve to permit full flow therethrough to flush any accumulated compressor lubrication oil logged in any associated evaporator coils.

REFERENCES:
patent: 3537272 (1970-11-01), Hales et al.
patent: 4459819 (1984-07-01), Hargraves
patent: 4548047 (1985-10-01), Hayashi et al.
patent: 4643002 (1987-02-01), Dennis et al.

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