Patent ID: 6311506
Filing Date: 2001-11-06
Classification: F25B

Abstract:
A control unit for use with a refrigerating machine having a compressor, a condenser, and an evaporator that are connected in series via a conduit, said refrigerating machine having a refrigerant for exchanging heat with a brine passing through the evaporator to maintain said brine at a preset temperature, said control unit comprising:a hot gas bypass line providing a bypass line for hot gas discharged from said compressor such that said hot gas is supplied to a line between said condenser and said evaporator;a pressure regulating valve mounted in said hot gas bypass line to open said hot gas bypass line, if vapor pressure of the refrigerant inside said evaporator becomes equal to or lower than a given pressure, thereby passing the hot gas, and to close said hot gas bypass line, if the vapor pressure of the refrigerant inside said evaporator becomes higher than said given pressure, thereby cutting off said hot gas; anda temperature-responsive valve mounted in said hot gas bypass line to open said hot gas bypass line, if the preset temperature of said brine becomes equal to or higher than a given temperature, and to close said hot gas bypass line, if the preset temperature of said brine becomes lower than the given temperature.