Type III — Low-PressureQuestion 195 of 240
Excessive water in a low-pressure chiller can freeze and rupture tubes because low-pressure refrigerants:
a.Boil at very high temperatures
b.Absorb water readily
c.Evaporate at low temperatures that can chill the water below freezing
d.Contain antifreeze additives
Explanation
Because low-pressure refrigerants boil at low temperatures under vacuum, they can chill intruding water below its freezing point, and the expanding ice can rupture the chiller tubes. Water intrusion also causes acid and corrosion. This is one more reason to keep the machine tight and free of leaks.
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