All HVAC/R systems must be protected by a?

In HVAC/R systems, a pressure relief valve plays a crucial role in ensuring the safety and proper functioning of the system. This device is designed to release excess pressure that could build up within the system, preventing potential leaks or catastrophic failures. By venting pressure when it exceeds safe operational limits, the pressure relief valve protects components of the system and enhances overall reliability.

While other options may contribute to the protection of specific components or functionality—such as low-pressure and high-pressure switches safeguarding against operational extremes or compressor overloads protecting the motor—the pressure relief valve is unique in its ability to directly mitigate risks associated with pressure build-up. This proactive measure is essential across all HVAC/R systems to maintain safe operating conditions, uphold system integrity, and protect against accidents.