RefrigerationPregunta 64 de 110
Evacuating a system with a vacuum pump primarily removes what?
a.Refrigerant oil
b.Copper scale
c.Moisture and non-condensable gases such as air
d.The compressor windings
Explicación
A deep vacuum boils off moisture and pulls out air and other non-condensables that would otherwise raise head pressure, form acids, or cause icing at the metering device. A micron gauge verifies the target vacuum is reached and held. Proper evacuation is essential before charging.
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