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.Air and moisture are drawn into the system
b.Nothing changes until the charge is empty
c.The system pressure rises sharply
d.Refrigerant sprays out rapidly
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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