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Which consequence results when a chiller's refrigerant loses non-condensable gas purge?

A)Decreased superheat at evaporator outlet
B)Increased back pressure at compressor
C)Elevated subcooling at condenser exit
D)Lowered oil viscosity in the crankcase

💡 Explanation

Increased back pressure at compressor arises because non-condensables like air raise total presssure. This requires higher compressor effort, therefore leading to increased back pressure, rather than reduced evaporator superheat that might be caused by overcharging.

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