Question

Before recharging any flammable hydrocarbon or HFO refrigerant, always ________.

a) evacuate the system
b) leak test the system
c) add more refrigerant
d) purge the recovery equipment

Answer 1

The correct step before recharging any flammable hydrocarbon or HFO refrigerant is to always evacuate the system to remove non-condensable gases, moisture, and residual flammable refrigerants.

Step-by-step explanation:

Before recharging any flammable hydrocarbon or HFO refrigerant, always evacuate the system. This step is crucial to remove any non-condensable gases, moisture, and to ensure that there is no residual flammable refrigerant present that could react when new refrigerant is added. Evacuation of the system maintains the purity and performance of the refrigerant and ensures the safety of the process, helping to prevent potential hazards such as explosions or fire.