Based on a neutral zone control gen.

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Документ о системах промышленного охлаждения

X is a four-step controller with up to four relay outputs.
It controls the loading/unloading of the compressors/pistons or the electric motor of the compressor according to the suction pressure signal from the pressure transmitter Y or Z.
***Based on a neutral zone control, X can control a pack system with up to four equally sized compressor steps or alternatively two capacity controlled compressors (each having one unload valve).

Спасибо.