High Pressure Safety Valve HVAC: Testing and Inspection

The high-pressure relief valve is a safety feature which releases part of the refrigerant inside the system into the atmosphere when the high-pressure level exceeds 3,740 kPa (532 psi) during air conditioning operation.
Once the pressure inside the system has been reduced to 2,940 kPa (418 psi) or lower, the high-pressure relief valve closes, thus allowing continued operation.
1. If a leak is detected at section A, replace the high-pressure relief valve. The valve can be used unless there is a leak from that section.
2. If a leak is detected at section B, retighten the valve. If the leak persists after retightening the valve, replace the packing.