When installing isolation valves, what should the isolation section of the system be protected against?

The correct consideration when installing isolation valves in a refrigeration or air conditioning system is to protect the isolation section against excessive pressure. Isolation valves are critical components that allow segments of a system to be safely isolated for maintenance, repair, or service. When pressure builds up excessively within the system, it can lead to valve failure, leaks, or even catastrophic system damage.

Properly protecting against excessive pressure ensures that the isolation section operates within its intended pressure range, helping to maintain system integrity and safety. Pressure relief mechanisms, such as pressure relief valves, can complement isolation valves by preventing dangerous overpressure conditions.

While low temperature, corrosion, and air leaks are all valid concerns that should be managed within an HVAC system, they do not directly pertain to the primary reason for protecting the isolation section of a system equipped with isolation valves. For instance, while corrosion might affect the longevity of the valves, it does not constitute an immediate risk associated with the operation of isolation valves like excessive pressure does. This focus on pressure is crucial for maintaining both safety and efficient operation within the system.