Patent ID: 8191376

Claim:
A refrigerant system being operable in at least a heating mode and containing a refrigerant in heat transfer relationship with an outside fluid for ultimately heating a comfort zone or a process, the refrigerant system comprising: a heat exchanger system containing at least some of the refrigerant; a compressor periodically drawing the refrigerant at a suction pressure and discharging the refrigerant at a discharge pressure, thereby providing the refrigerant system with a high-pressure side and a low-pressure side; and a pressure relief valve defining an inlet and an outlet, the inlet is connected in fluid communication with the heat exchanger system, the outlet is connected in fluid communication with the low-pressure side, the pressure relief valve opens to release at least some of the refrigerant from within the heat exchanger system in response to the refrigerant within the heat exchanger system exceeding a maximum pressure limit, wherein the maximum pressure limit is even greater than the discharge pressure of the compressor.