Refrigeration – Processes – Defrosting or frost inhibiting
Patent
1989-12-28
1990-12-18
Wayner, William E.
Refrigeration
Processes
Defrosting or frost inhibiting
62158, 62217, G05D 2332
Patent
active
049777513
ABSTRACT:
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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Lackey D. R.
Thermo King Corporation
Wayner William E.
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