Type III — Low-PressureQuestion 191 of 240
The main reason a torch must never be used to warm a low-pressure chiller during recovery is that:
a.It wastes propane
b.Open flame can decompose refrigerant into toxic gases and is a burn and pressure hazard
c.It has no effect on recovery speed
d.It cools the refrigerant too fast
Explanation
An open flame can break refrigerant down into toxic gases such as phosgene and hydrogen chloride, and localized heating can raise pressure dangerously and cause burns. Warm water or built-in heaters are the safe way to add heat. This is why torches are prohibited for warming the shell.
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