ETI SIT-6E User manual

Installation
SensorHousing
Takecareinchoosingalocationforyourpavement-
mountedsensor.Thelocationshouldbe:
•Centeredbetweenrunsofhydronictubing orheater
cable.
•Exposedtoprecipitationandpedestrianorvehicular
traf c.
•Awayfromexternalheatsourcesinexcessof185°F.
(85°C.).
TheSIT–6Esensorcanbelocatedupto2,000 feet(609.6
meters)fromtheassociatedsystem controls.Use3-conductor
#18AWGjacketedcablefordistancesupto500feet(152.4
meters).Use#12AWGforgreaterlengths.Insulateand
waterproofall splices.
Thesensorplateshipsinstalledinthesensorhousing.
Beforeinstallingthesensorhousingremovethesensorplate,
placingthesensorplateandthethreemachinescrewswhere
theywillnotbelostordamaged.
Install thesensorhousingonafirm,smoothsurfacesuch
asaprecastpatioblockorsimilarmasonrymodule.Care
shouldbeexercisedinadjusting thefinalgradeandlevel
ofthesensortoensurethatthesensorsurfacewill beflush
withthefinishedpavement,andthattheadjacentpavement
beeitherlevelorslightlycrowned.Asensorsubmergedin
puddledwaterwillnotfunctionproperly.Tostabilizethefinal
locationofthesensorpriortopaving,insertlengthsofreinforcingrodorsimilardowelson oppositesidesofthe 3/4"(20 mm)rigid
conduit andsecurewithiron tiewire.
Usethesheetmetalcover suppliedwiththeSIT–6Etoprotectthesensorhousingduringpaving. Thesensorplateshould
notbeinstalleduntil afterpaving iscompleteand thesheetmetalcoverisremoved.Caulkingmayberequiredbetweenthesensor
housingand thepavedsurface.
Conduit
Useindividual3/4"(20mm)rigidconduitfortheentireinstalledlengthofthesensorcable,takingcaretoensurethatallembeddedor
outdoorcouplingsandterminationsaremadewatertight.Donotshareconduitwithotherwiring.Donotrouteconduitacrosspavement
expansionorcontroljoints. Forsensorsembeddedinslabongrade, conduit shouldbedepressedunderthesejoints, asnecessary.
Wiring
TheSIT–6Esensorisfurnishedwith18"(46cm)#18AWGfieldleads.Thered,blackandwhitewiresconnecttotheControlPanel
viausersuppliedcable.Usetheepoxyfilledwirenutssupplied.ForproperwiringconnectionsoftheSIT–6EsensortoAPS–3C,
APS–4CorEUR–5Acontrolsconsult theInstallation InstructionsfortheappropriateControlPanel.
Afterwiringthesensor,kneedthesuppliedductsealanttill pliable.Packductsealantintothesensorhousing leavingenoughspace
forthesensorelectronicsandwiring. Properlyused,theductsealantwill minimize theaccumulationofwaterand iceinthehousing
and protectthesensoragainstpossibleicedamage.
Next, placewiringandelectronicsintothehousing.Checkforalignmentbetweenthesensorandpavementsurfaces. If thesensor
and pavementarenotalignedremovethesensorfromthehousingandadjustthehousing flange.Thehousing flangecanberaisedup
to.63"(16mm)toallowthesensorsurfacetobealignedwiththepavementsurface.Alowsensorwill poolwaterandnotfunction
properly.
WeManageHeat®
ModelSIT®–6ESnowSwitch®
Part Number20756
Installation Manual
WHT(SIGNAL)
BLK(RETURN)
RED(POWER)
3-Conductor
Flat Cable
Epoxy-filled
WireNut(3)
ETI P/N20757
PrecastConcrete
PatioBlock orSimiliar
MasonryModule
3/4"(20mm)RigidConduit
SIT–6EInstallationDrawing
SecureConduit
WIthDowelsand
Iron TieWIre
Duct Seal
ETI P/N20763
Enclosure
ETI P/N20760

Testing
Shouldpaving materialorotherresiduebeadheredtothesensingelements,cleanthesurfacewithaScotch™BritePad. Donot
usemetallicorcourseabrasivesordetergents.
Thoroughlycheckthesystembeforeplacingitinservice.Ourexperienceshows thatinstallationerrorscausethemajorityof
problems.Frequentlyencounteredproblemsincludewiringerrorsandimproperwaterproofing.Simpleelectricaltestsand visual
inspectionsidentifytheseproblems.
Independentofweatherconditions,thefunctionaloperationofaninstalledSIT–6Esensormaybedeterminedusingadigital
voltmeter(DVM)andatenpound(4.54kg)bagofcrushedice, inthefollowingmanner:
Followingthisproceduremayresult intheengagementoftheheatersystem.Aftercompletion, itisrecommendedtopower
downthesystemtoreset.If heaterengagementcancausedamage, it isup tothepersononsitetodisconnecttheheaters.
1.WiththeDVMsetthe100VACrange,verifythesensorsupplyvoltagebyconnectingthenegative(-) testleadtothesensor
blackwireandthepositive(+)testleadtothesensorredwire.ADVM readingbetween22-28 VACor24-30VDCis
acceptable.AnACcomponentlessthan28VACisallowedwithaDCvoltageintheproperrange.
2.Withthenegative(-) testleadremaininginplace,reconnectthepositive(+)testleadtothesensorwhitewireandcon rm
thereisanidenticalvoltagepresent.
3.Placetheentiresupplyofcrushediceatopthesensorand allowatimelapseinexcess of20 minutesbeforeobserving
thatnovoltageisindicatedby theDVM.(Anominaltemperaturebelow38°F (1°C) mustbedetectedbeforethesensor’s
normally-opencontactisclosed. If thesensorsurface temperaturewasexcessivepriortocommencingthisprocedure, it will
benecessarytoextendthecooldowntime intervalbyasmuchasanadditional20minutes.)
4.Withsatisfactoryresults, disconnecttheDVMandrestoreallsensorwiring connections.
You mayelecttode-energize thesnow/icemeltingsystemheatersattheseason’send,howeverit issuggestedtheSIT–6Esensor’s
powersupplybemaintainedcontinuously.Theheatenergydissipatedfromtheinternalheater,althoughmodest,willenhance the
long-termreliabilityoftheSIT–6E sensor.
QUESTIONSAND COMMENTS
Fortechnicalhelp, questionsorcommentsconcerningthisproductoranyofEnvironmentalTechnology, Inc.productscontact
theCustomerService Departmentbetween8:00amand 5:00pmESTat:
Voice:800.234.4239(USAand Canada)or574.233.1202(elsewhere)
Fax:[phone](USAand Canada)or574.233.2152(elsewhere)
E-mail:[e-mail]
The ETI logo,Snow Switch,WeManage Heat, APSandSIT are registeredtrademarksof Environmental Technology,Inc.
EUR isatrademarkof Environmental Technology,Inc.
Copyright ©2008 Environmental Technology,Inc. All rightsreserved.
PrintedinUSA PN20758revB11/08
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