Patent ID: 9139066
Filing Date: 2015-09-22
Classification: B60H,F25B

Abstract:
1. A refrigerant system comprising: a compressor, said compressor having an electric motor driving a compressor pump unit, and being housed within a compressor shell; a first heat exchanger downstream of said compressor, an expansion device downstream of said first heat exchanger, a second heat exchanger downstream of said expansion device, and refrigerant passing from said compressor through said first heat exchanger, through said expansion device, to said second heat exchanger, and then returning through a suction port back into said compressor shell; refrigerant passing from said second heat exchanger to a main flow line having a pulse width modulation controlled valve, and a branch line having a second valve, said second valve having a controllable opening to control pressure within said compressor shell; and said second valve controlling said pressure between 0.5 psia and 2 psia, when said pulse width modulation valve is in a closed position.