Type III — Low-PressureQuestion 192 of 240
In a low-pressure chiller, the evaporator normally operates:
a.At very high positive pressure
b.At exactly atmospheric pressure
c.Above the condenser pressure
d.Below atmospheric pressure, in a vacuum
Explanation
The evaporator of a low-pressure chiller runs below atmospheric pressure, that is, in a vacuum, because the refrigerant boils at a low temperature under low pressure. This vacuum is why leaks admit air and moisture. Understanding this is central to all Type III procedures.
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