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?

Question

Accepted Answer

Option C: the highest. When all evaporators demand refrigeration, suction pressure rises and acts on capacity controls, maximizing the hydraulic relay piston oil pressure to keep all compressor cylinders loaded.