Type III — Low-PressureQuestion 166 of 240
Because a low-pressure chiller operates in a vacuum on the low side, what happens when it develops a leak?
a.Refrigerant sprays out rapidly
b.Air and moisture are drawn into the system
c.The system pressure rises sharply
d.Nothing changes until the charge is empty
Explanation
Since the low side runs below atmospheric pressure, a leak pulls air and moisture inward rather than pushing refrigerant out. That incoming air becomes non-condensable gas the purge unit must remove, and the moisture can cause acid and corrosion. This inward leakage shapes nearly every Type III service procedure.
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