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1. UsingtheNozzleSizechartintheAppendixofthismanual,followthe‘FeedPressure’columndown
to‘200’(theoperatingpressureoftheAqua-LabSystem).
2. Findtheowratetotherightof‘200’thatisclosesttothedesiredtargetowrate;fromtherefollow
thatcolumnbacktothetopofthecharttondtheappropriateNozzlesize.
3. UsingtheChemicalMeteringRatechartintheAppendixofthismanual,ndtheowratealongthe
topthatisclosesttotheowrateyoujustdeterminedinstep2above.
4. Followthatcolumndownuntilyoundthedilutionratio(concentration)thatisclosesttothetarget
value,thenlooktotheLeftofthecharttoseewhichmeteringtipitcorrespondsto.
NOTE:Itmaybenecessarytochangetoadifferentinjector’ssizebasedonthespraypatternand
deliveryofchemicaltothevehicle.InthatsituationusetheNozzlesizecharttodeterminethenewow
rateat200psiandrepeatsteps3and4abovetosetthechemicalusage.
NOTE:Thedilutionratios(concentrations)givenintheChemicalMeteringRateChartarebasedon
drawingwaterthroughthetips.Someadjustmentstoatiplargerorsmallermayberequiredduetothe
differentofviscositiesofthechemicalsandwater.
POST INSTALLATION VACUUM & BACK
PRESSURE CHECK
If the spray nozzles on the arch are too small for the injector chosen, the back pressure put on the
injector may cause the vacuum to not function and chemical will not be pulled
The checks below are intended to help identify any potential issues that would cause the injector
not to function correctly
CHEM-FLEX INJECTOR VACUUM CHECK
1. AttheChem-FlexInjector,removethechemicalfeedlinefromtheinjectorhosebarb.
2. AttachedthetubingofthevacuumgaugetotheChem-Flexhosebarb.
3. Withthepump(s)on,manuallyactivatethechemicalthatistobetestedatthemaincarwashcontrol
cabinet.Aninjectorthatisworkingproperlywillhaveareadinggreaterthanorequalto(≥)18inHg
4. Repeatsteps2-4foreachchemicallanethatavacuumreadingisneededfor.
5. Oncetestingiscomplete,turnofftheAqua-Labpumpfromthemaincarwashcontrolcabinet.
CHEM-FLEX INJECTOR VACUUM CHECK
Back Pressure is dened as the pressure that is created between the injector and the arch nozzles.
It is caused by the chemical solution from the injector trying to push its way through the nozzle, the
smaller the nozzles the harder it is to push through and consequently higher back pressure
1. DisconnecttheoutlethosefromtheChem-Flexinjectorthatabackpressurereadingwillbetakenfor.
2. ConnectthebackpressuregaugeassemblytotheoutletoftheChem-Flexinjector.
3. Connectthehosetothearchtotheotherendofthebackpressuregaugeassembly.**Makesureall
hosebarbttingsaresecuredwithhoseclamps.
4. TurnontheAqua-LabpumpandthesolenoidvalvefortheChem-Flexbeingtestedfromthemain
carwashcontrolcabinet–Thebackpressureshouldnotexceed33%ofthefeedpressure(forthe
Aqua-Labwiththefeedpressuresetto200psithebackpressureshouldnotexceed66psi).
5. TurnofftheAqua-Labpumpandsolenoidvalveatthemaincarwashcontrolcabinet.
6. Removethebackpressuregaugeassemblyfromtheinjectorandreconnectthehosetothearch.
**Makesureallhosebarbttingsaresecuredwithhoseclamps.
7. Repeatsteps1-5foreachinjectorthatabackpressurereadingisneededfor.