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Handbook
Applications
Constant Pressure System:
In constant water pressure systems, only the required discharge pressure needs setting. Cut-in / out pressures do not
play a role in this system.
In Grundfos's BMQE constant water pressure system (EZ Boost), this is done by a simple touch of a button on the
accompanying CU 301 control unit. Discharge pressure can be set from 40 to 100PSI, according to individual needs and
piping system limitations.
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Flow Based Pressure Boosting:
The pump starts automatically when water is consumed and stops automatically when the consumption ceases.
This is accomplished by a flow switch connected to a printed circuit board (PCB). The flow switch is closed when
water is consumed and the signal sent to the PCB starts the pump. The flow switch is opened when the con-
sumption ceases and the signal sent to the PCB stops the pump.
The pump will produce pressure in relation to the flow rate with any incoming pressure cumulative to the total
discharge pressure.
Incoming PSI = City Water Pressure
Outgoing PSI = Incoming PSI + MQ Performance
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