Grundfos MQ 3-45 - Operating Conditions and Suction Lift

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Project2:Layout 1 4/22/11 6:59 PM Page 4
Untitled-1 1 4/22/11 7:07 PM
Project2:Layout 1 4/22/11 6:59 PM Page 4
Untitled-1 1 4/22/11 7:07 PM
Project2:Layout 1 4/22/11 6:59 PM Page 4
Untitled-1 1 4/22/11 7:07 PM
Handbook
Notes
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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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Time
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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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