Refrigeration system having a modulation valve which also...

Details Refrigeration system having a modulation valve which also... Refrigeration system having a modulation valve which also...

F - Mech Eng,Light,Heat,Weapons

25

B

62/41

F25B 41/00 (2006.01) F25B 41/04 (2006.01) F25D 29/00 (2006.01)

Patent

CA 2030413

55,492 ABSTRACT OF THE DISCLOSURE A refrigeration system having a modulation valve which controls refrigerant flow to a compressor according to a control algorithm. The need for a compressor throttling valve is eliminated by a load control circuit which operates the modulation valve to perform the function of the throttling valve when load reduction is required. An overload condition of a compressor prime mover overrides the control algorithm and selects a predetermined load control position of the modulation valve. A timer ensures that a predetermined recovery time is provided, before switching back to the control algorithm. The timer also selects the load control position of the modulation valve upon start-up. A heating or defrost mode automatically selects the load control position of the modulation valve for the duration of the mode, as does an ambient air temperature sensor when the ambient exceeds a predetermined value.

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