Type III — Low-PressureQuestion 182 of 240
HCFC-123 requires good ventilation during service primarily because it:
a.Is highly flammable
b.Freezes at room temperature
c.Has a low exposure limit and can accumulate in low areas
d.Reacts violently with water
Explanation
HCFC-123 has a relatively low allowable exposure limit, and like most refrigerants it is heavier than air and can accumulate near the floor in a machine room, displacing oxygen. Good ventilation and a refrigerant monitor protect the technician. It is not flammable, but exposure must still be controlled.
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