Grundfos BMQE 15 - Page 24

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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
PRE-INSTALLATION
A guide to the EZ Boost System
The EZ Boost Constant Pressure System automatically
balances water surges and equalizes flow and pressure
according to consumption. In other words, the system
maintains a constant water pressure in spite of varying
water consumption. The pressure is registered by means
of the pressure sensor and transmitted to the controller.
ThecontrolleradjuststheEZBoostBMQEpumpperform-
anceaccordingly.The EZBoostConstantPressureSystem
features:
• Quickandeasyinstallation:ready-to-usesystem 
 requiringminimumspace
• Highuserconvenience:constantpressureregardlessof
 waterconsumption
• Easilyadjustablepressurelevel:pushbuttoncontrol
• Continuouscontrolandmonitoringofpumpoperation
• Integrateddry-runningprotection
• Integratedoverloadprotection
• Integratedprotectionagainstovervoltageandunder
 voltage
• Softstartsystem
Function
Whenatapisopened,the pressure in thetankwillstart
todrop.Thesystemmaintainsaconstantpressurewithin
themaximumpumpperformanceinspiteofvaryingwater
consumption.
Thepressureisregisteredbymeansofthepressuresensor,
which transmits a signal to the controller. The controller
adjusts the pump performance accordingly to maintain
constantpressurebychangingthepumpspeed.
Atlowflowthepressurewilldropslowly.Whenthepres-
sureinthetankis7PSIbelowthesetpoint,thepumpwill
start. When the pressure is 7 PSI above the setpoint, the
pumpwillstop.
EventhoughtheEZBoostcontrolleriscontrollingthepres-
surewithin±3PSI,largerpressurevariationsmayoccurin
thesystem. If the consumption is suddenly changed, e.g.
if a tap is opened, the water must start flowing before
the pressure can be made constant again. Such dynamic
variations depend on the pipe work, but, typically, they
willliebetween7and14PSI.Ifthedesiredconsumptionis
higherthanthequantitythepumpisabletodeliveratthe
desiredpressure,thepressurefollows the pumpcurveas
illustratedinthefarrightoffig.1.
Fig.1
Atlargeflowrates,thepressurewilldropquicklyandthe
pumpwillstartimmediatelyandmaintainconstantpres-
sure.Whenthesystemisrunning,theEZBoostcontroller
makessmalladjustmentstothepressuretodetectwhether
thereisconsumption.Ifthereisnone,thepumpwillsimply
refillthetankandstopafterafewseconds.
Pressure
Flow
A
Stop
+7PSI
Start
-7PSI
Controlling
±3PSI
Dynamic
variations
±7PSI
GPM0.8
A=Pressuresettin
g
Product Guide EZ Boost
TM
System
24
1
2
Air escape valve
Diaphragm tank
EZ Boost controller
Isolation valve
Pressure gauge
Pressure sensor
BMQE pumps connected in parallel
When connecting BMQE pumps in parallel as shown in
fig.5,a separate EZ Boost controller must be used on each
BMQE. Set the pressure on one BMQE 10 PSI lower than
theother.
For BMQE pumps connected in parallel, mounted above
each other, it is recommended to connect the pipes as
showninfig.5.ThislayoutensuresthattheBMQEpumps
arefilledwithwaterbeforestarting.
Fig.5 BoosterunitwithtwoBMQEpumps 
  connectedinparallel,mountedaboveeach
  other.
Notes:
• AllBMQEmodulesaresuppliedwithanon-return
 valve.
• BMQEmodulesconnectedinparallelmayalsobe
 installedvertically.
• Asventingproblemsmayariseinsuchinstallations,itis
 advisabletoinstallsuitableairventdevices.
• TheBMQEshouldbepositionedwiththedischargeand
 airventatthetopwheninstalledvertically.
• WhenthemaximumflowforBMQEpumpsinparallel
 will exceed 35 GPM, a 4-gallon or two 2-gallon dia-
 phragmtank(s)shouldbeused.
Product Guide EZ Boost
TM
System
25
L-DWS-PG-01 8-09.indd 24 11/12/11 12:49 AM