Type III — Low-PressureQuestion 192 of 240
In a low-pressure chiller, the evaporator normally operates:
a.At very high positive pressure
b.Below atmospheric pressure, in a vacuum
c.At exactly atmospheric pressure
d.Above the condenser pressure
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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Related questions on this topic
- Which refrigerant is a CFC once widely used in low-pressure chillers and now available only as reclaimed stock?
- A machine room housing a low-pressure chiller should have a refrigerant monitor and ventilation mainly to protect against:
- The main reason a torch must never be used to warm a low-pressure chiller during recovery is that:
- A technician recovering R-123 reaches 25 mm Hg absolute but the reading rises back up after the recovery machine stops. This usually indicates:
- Which of the following is NOT a low-pressure appliance refrigerant?
- Excessive water in a low-pressure chiller can freeze and rupture tubes because low-pressure refrigerants:
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