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Domestic water supplyTable of contents1. Grundfos DWS family 3DWS applications 3DWS product selection 42. BMQE 5Product introduction 5Product overview 7Construction 8Operating conditions 10Installation 10Quick selection guide 12Curve charts and technical data 12Accessories, BMQE 183. MQ 19Product introduction 19Product overview 21Construction 22Operating conditions 24Installation 24Selection of product 24Curve charts and technical data 25Accessories, MQ 284. JP Jet Pumps 29Product introduction 29Product overview 31Construction 34Operating conditions 35Selection 35Selection of pumps 35Installation 35Curve charts and technical data 36Dimensions and weights 41Electrical data 45Approvals 455. Further documentation 46WebCAPS 46WinCAPS 472
Domestic water supply11. Grundfos DWS familyThe Grundfos Domestic Water Supply (DWS) family ofpumps includes:• BMQE Constant Pressure System• MQ Flow Based Pressure System• Jet pumps.This product guide offers information about each ofthese product lines.DWS applicationsThe Grundfos DWS family includes pumps to fit mostapplications including:• Constant pressure systems (BMQE)• flow-based pressure boosting (MQ)• rain water harvesting (MQ)• pressure-switch-based boosting (Jet)• suction lift (Jet).CProductApplicationBMQE MQ JetConstant pressure system • - -Flow-based pressure boosting - • -Rain water harvesting - • -Suction lift - • •Pressure-switch-based boosting - - •Constant pressure systemsIn constant water pressure systems, only the requireddischarge pressure needs setting (fig. 1).Cut-in and cut-out pressures do not play a role in thissystem.Discharge pressure can be set from 40 to 100 psi,according to individual needs and piping systemlimitations.Flow-based pressure boostingWith flow-based pressure boosting, the pump startsautomatically when water is consumed and stopsautomatically when the consumption ceases. This isaccomplished via a flow switch connected to a printedcircuit board (PCB).The pump will produce pressure in relation to the flowrate with any incoming pressure cumulative to the totaldischarge pressure (fig. 2).Incoming psi Outgoing psi =(city water pressure)Incoming psi + performanceFig. 2Flow-based pressure boostingRain water harvestingRain water harvesting is a way to store rain water forfuture use — for example, watering a garden. Rainwater is collected from the roof of a home andcollected into a storage container. Pull a suction liftusing a non-collapsible suction line from the storagecontainer or connect the inlet of the pump to a spigot atthe bottom of the collection barrel for flooded suction.Suction liftHigh pressure water from the drive pipe passesthrough the venturi and pulls water from the well intothe ejector, then pushes it up to the pump. This makesit possible to push water up to the pump from depthsgreater than 25 feet or to boost the output from ashallow well pump to higher pressures.DrivepipeSuction pipeTM01 9873Grundfos DWS familyHeadVenturiFig. 1TimeIn a constant pressure system, pressure does notvary in relationship to consumptionTM04 9463 4310Fig. 3InletSuction lift pressure boostingNozzleTM05 0823 1611Pressure-switch-based boostingPressure switches are used to control pump operation.These switches have a cut-in pressure and a cut-outpressure to turn the pump on and off respectively.3
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