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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? GS-RA-13
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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