Pump Logic: Sequenced Constant-Speed Pumps - McQuay MicroTech II Operation Manual

Pump Logic: Sequenced Constant-Speed Pumps

Configuration 3 uses the CSM's sequencing pump logic. Sequencing logic can be applied to a group of two to six pumps,
which are identified as Cooling Load Pump #1 through Cooling Load Pump #6 on the Flow screen. It operates one or more
pumps as required to maintain the differential pressure across the loop at the Loop Differential Pressure Setpoint. For
applications that require exact differential pressure control, the CSM can modulate a loop bypass valve as it sequences the
pumps.
Sequencing and Staging
A pump stage is defined as a set of pumps. As the CSM turns pumps on and off, it "stages up" and "stages down." Pumps
in the current stage are started; other pumps are stopped.
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