What method is permitted under EPA regulations for pressurizing an R-11 or R-123 system before a non-major repair?

Using compressed air to pressurize a refrigerant system, such as one containing R-11 or R-123, is strictly prohibited under EPA regulations due to the potential for moisture introduction and chemical reactions that could occur, which would compromise system integrity and efficiency. The correct method is to warm the refrigerant, as this approach helps to increase pressure within the system safely without introducing contaminants or causing damage.

Warming the refrigerant increases the temperature of the refrigerant, thereby raising its pressure in a controlled manner, while still allowing the system to maintain a safe operational status. This method is preferable because it is both effective and minimizes the risk of any adverse chemical reactions or system damage.