Type III — Low-PressureQuestion 169 of 240
Frequent operation of the purge unit on a low-pressure chiller is usually a sign that:
a.The refrigerant charge is too high
b.The machine has a leak drawing air in
c.The compressor is overcharged with oil
d.The condenser water is too cold
Explanation
A rising purge rate means air is leaking into the vacuum side of the chiller, so the purge unit runs more often to remove it. The correct response is to find and repair the leak, not simply purge more. Modern high-efficiency purge units also track how much they run as a diagnostic.
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