A transport refrigeration system of the type which can provide either cooling or heating includes a pressure regulating valve 42 controlling hot gas to the evaporator during a heating cycle and operable to prevent an excessive suction pressure, and a pressure regulating valve 74 between the two outlet sides of a three-way valve and operable to pass refrigerant from the hot gas line 34 to the condenser 30 when the hot gas pressure is excessive, the arrangement limiting the values of both the evaporator suction pressure and the hot gas discharge pressure t...
In a transport refrigeration unit of the type adapted to selectively provide either cooling or heating, a refrigeration system including: a three-way valve having an inlet, and first and second outlets; a refrigerant compressor having a discharge line connected to supply said three-way valve; a refrigerant condenser; a refrigerant evaporator; first refrigerant line means connecting the first outlet of said three-way valve to said condenser for operation of the system in a cooling mode when said three-way valve is in a first position; hot gas refrigerant ...
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