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During operating periods of a multi-box refrigeration system using a capacity controlled compressor, when all of the evaporators of a four box plant are actively being fed with liquid refrigerant, the control oil pressure acting on the hydraulic relay piston will be at what value?
A) the lowest
B) at its mid-range
C) the highest
D) of no consequence as the lube oil is not used in the operation of the unloader
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