Patent ID: 7694527

Claim:
A system comprising: a cooling circuit comprising a compressor, a vessel and an evaporator in fluid communication, the compressor having a discharge side and a suction side; a reheat circuit comprising: a first valve to control the flow of a refrigerant into the reheat circuit in fluid communication with the discharge side of the compressor and switchable between a first position in which the refrigerant from the compressor flows through the reheat circuit and is blocked from flowing to the vessel and a second position in which the refrigerant from the compressor flows to the vessel and is blocked from entering the reheat circuit; and a heat exchanger configured and positioned to receive refrigerant from the first valve and to exchange heat with air flowing across the heat exchanger, the heat exchanger in fluid communication with the evaporator to provide refrigerant to the evaporator when the first valve is in the first position; and a by-pass circuit configured and positioned to provide fluid communication between the suction side of the compressor and the heat exchanger, the by-pass circuit comprising a second valve to control the flow of refrigerant out of the reheat circuit and switchable from a first position in which refrigerant flows from the reheat circuit when the first valve is in the second position and a second position in which the flow of refrigerant is blocked from leaving the reheat circuit when the first valve is in the first position; and a third valve configured and positioned to permit flow of refrigerant to the vessel in response to the first valve being in the first position and a refrigerant pressure in the reheat circuit being greater than a predetermined pressure.