What is the correct pressure for recovering R-134a refrigerant in a system?

The correct pressure for recovering R-134a refrigerant in a system is approximately 25-30 psi in a vacuum. This range is important because it aligns with the specific characteristics of R-134a, particularly when dealing with its pressure-temperature relationship. When recovering refrigerants, it is essential to operate within the appropriate pressure range to effectively remove the refrigerant from the system without causing any potential damage or inefficiencies during the process.

In practice, the recovery of refrigerants must be conducted at pressures that allow for complete removal while avoiding risks like oil foaming or liquid refrigerant entering the recovery equipment. The 25-30 psi range is designed to ensure that the refrigerant is effectively pulled from the system while keeping the process safe and compliant with regulations regarding refrigerant handling. Understanding these pressures helps technicians ensure they are performing recovery operations correctly, thus contributing to environmental safety and compliance with EPA regulations.