Minor repairs may be performed on low-pressure refrigerant systems without recovering the refrigerant charge if the pressure in the system is raised to atmospheric. How may this be accomplished?

Correct Answer: Option D — heat the refrigerant

Raising low-pressure system internal pressure to atmospheric levels before minor repairs can be safely achieved without active refrigerant recovery by applying controlled heat to the system, causing the liquid refrigerant to boil off and elevate vapor pressure to equilibrium.