Transcription of THE CHANGING MACHINE ROOM: MULTIPLEX …
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THE CHANGING MACHINE ROOM: MULTIPLEX …
In an effort to maintain a minimum common suction pressure, the rack s energy management system (EMS) will cycle compressors on/off as required. Cycling may involve a compressor cycling on/off, or a compressor of one size cycling off while a compressor of another size cycles on. The connected circuit that operates at the lowest tempera-ture determines the rack s common suction circuit temperature is typically controlled with an evaporator pressure regulator (EPR). By main-taining a constant pressure (refrigerant saturation tem-perature) in the evaporator, a fairly constant evaporator discharge air temperature will be maintained. Recently there has been a move from EPR valves to electroni-cally controlled step-motor suction line regulators.
In an effort to maintain a minimum common suction pressure, the rack’s energy management system (EMS) will cycle compressors on/off as required.
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