Watts 654 Installation guide

Watts
Brand
Watts
Model
654
Category
Thermostats
Type
Installation guide

This manual is also suitable for


of56 ©203WattsRadiant


AutomaticSnow/IceDetection
SupportsBothInslab&RetrofitAerialSensors
ManualStartWithTimer
ProgrammableSchedule
tekmarNet
®
CommunicationCompatible
WarmWeatherShutDown
ColdWeatherCutOut
Idling
SnowMeltZoningWithPriority
TandemSnow/IceDetection
SlabProtection
Storm
EconoMelt
ManualOverride
SnowMeltZoneTracking
Scenes
AwayKey
Exercising
AlertOutput
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
TheSnowMeltingControl654isdesignedtooperateelectricorhydronicequipmenttomeltsnoworicefromadriveway,
loadingdock,sidewalk,patio,helipadorcarwashbay.Thesnowmeltsurfacetemperatureiscontrolledusingslaboutdoor
resettoreduceoperatingenergycosts.The654providesautomaticstartandstopwhenusedwiththeSnow/IceSensor
090.AutomaticstartwithatimedstopisavailablewhenusedwiththeSnowSensor095.The654canoperateadedicated
hydronicboileroramixingdevice.Isolationrelaysarerequiredtooperatelinevoltagepumps.Electricsystemsrequirea
separateGFCIandelectricalrelaycontactor.
IOM-WR-Snow_Melting_Control-654328 2of56
ImportantSafetyInformation.............................................3
Applications.......................................................................4
SingleZonewithBoiler.................................................. 4
SingleZonewithBoiler&TandemSnow/IceSensors........6
SingleZonewithModulatingSteamValve.................... 8
Multi-ZoneCarWash.................................................... 0
Multi-ZoneElectric........................................................ 2
Installation........................................................................4
Preparation................................................................... 4
PhysicalDimensions.................................................... 4
InstallationLocation...................................................... 4
Rough-InWiring............................................................ 4
SizingtheTransformer................................................. 5
ControlWiring............................................................... 5
SensorWiring............................................................... 7
TestingtheSensorWiring............................................ 8
TestingtheControlWiring............................................ 8
ManualOverride-MaximumHeat............................... 9
ManualOverride-Test................................................. 9
ManualOverride-Purge.............................................. 9
ManualOverride-Off................................................... 9
SwitchSettings.................................................................9
UserInterface...................................................................20
Display.......................................................................... 20
OperationField............................................................. 20
StatusField................................................................... 20
Symbols........................................................................ 20
ProgrammableSettings....................................................2
ProgrammingMenus.................................................... 2
AccessLevelsandAccessLevelLock........................ 2
ViewMenu.................................................................... 22
SetTempMenu............................................................ 24
TimeMenu.................................................................... 25
ScheduleMenu............................................................ 26
DisplayMenu................................................................ 27
SceneMenu................................................................. 27
MonitorMenu................................................................ 28
ToolboxMenu............................................................... 29
OverrideMenu.............................................................. 30
SystemMenu................................................................ 3
BoilerMenu.................................................................. 32
MixMenu...................................................................... 33
tekmarNet
®
Menu......................................................... 34
SequenceofOperation................................................... 35
SnowMeltingOverview................................................ 35
SlabTemperatureControl............................................ 35
MeltOperation.............................................................. 35
Melt-ManualStartandTimedStop............................ 36
Melt-AutomaticStartandStop................................... 36
Melt-EconoMelt........................................................... 37
Melt-AutomaticStartandTimedStop........................ 37
Melt-TrackedStartandStop...................................... 38
Melt-ScheduledStartandStop.................................. 38
AdditionalMeltingTime................................................ 39
IdleOperation............................................................... 39
StormOperation........................................................... 39
WarmWeatherShutDown........................................... 40
ColdWeatherCutOut.................................................. 40
AwayScene.................................................................. 40
ProgrammableSchedules............................................ 4
TimeClock.................................................................... 4
SnowMeltZonesandPriority...................................... 4
SlabProtection............................................................. 43
ApplicationModes........................................................ 43
ElectricOperation......................................................... 43
PulseWidthModulationOperation.............................. 43
BoilerOperation........................................................... 43
MixingOperation.......................................................... 45
PipingofVariableSpeedInjectionSystems................ 46
DesignProcedure......................................................... 47
TandemSnow/IceDetection...................................... 48
Exercising..................................................................... 48
AlertRelay.................................................................... 48
PumpPostPurge.......................................................... 48
MeltandStormGroups................................................ 49
UserSwitchSetup........................................................ 49
Troubleshooting................................................................50
ErrorMessages............................................................ 50
FrequentlyAskedQuestions........................................ 54
JobRecord...................................................................... 54
TechnicalData..................................................................56
HydronicSystemElectronicControlsandThermostats
LimitedWarranty..............................................................56
CongratulationsonthepurchaseofyournewSnowMeltingControl!
Thismanualcoversthecompleteinstallation,programmingandsequenceofoperationforthiscontrol.Youwillalsofind
instructionontesting,commissioning,andtroubleshootingthecontrolandsystemthatitoperates.


3of56 ©203WattsRadiant
Theinstallermustensurethatthiscontrolanditswiringare
isolatedand/orshieldedfromstrongsourcesofelectromagnetic
noise.Conversely,thisClassBdigitalapparatuscomplies
withPart5oftheFCCRulesandmeetsallrequirementsof
theCanadianInterference-CausingEquipmentRegulations.
However,ifthiscontroldoescauseharmfulinterferenceto
radioortelevisionreception,whichisdeterminedbyturning
thecontroloffandon,theuserisencouragedtotrytocorrect
theinterferencebyre-orientatingorrelocatingthereceiving
antenna,relocatingthereceiverwithrespecttothiscontrol,
and/orconnectingthecontroltoadifferentcircuitfromthat
towhichthereceiverisconnected.
CetappareilnumériquedelaclasseBrespectetoutes
lesexigencesduRèglementsurlematérielbrouilleurdu
Canada.

Improperinstallationandoperationofthiscontrolcould
resultindamagetotheequipmentandpossiblyeven
personalinjuryordeath.
Thiselectroniccontrolisnotintendedforuseasaprimary
limitcontrol.Othercontrolsthatareintendedandcertified
assafetylimitsmustbeplacedintothecontrolcircuit.
Donotattempttoservicethecontrol.Therearenouser
serviceablepartsinsidethecontrol.Attemptingtodoso
voidswarranty.
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
Itis
theinstallers
responsibilitytoensurethatthiscontrolissafelyinstalledaccordingtoallapplicablecodes
andstandards.WattsRadiantisnotresponsiblefordamagesresultingfromimproperinstallationand/or
maintenance.
ReadManualandallproductlabels
BEFOREusingtheequipment.Donot
useunlessyouknowthesafeandproper
operationofthisequipment.
KeepthisManualavailableforeasy
accessbyallusers.
ReplacementManualsareavailableat
WattsRadiant.com
•
•
•
Disconnectallpowerbeforeopeningthe
control.
•

IOM-WR-Snow_Melting_Control-654328 4of56
Option
Snow/IceSensor090
Option2
SnowSensor095and
SlabSensor072
Option3
SlabSensor072
Outdoor
Sensor070
Relay Relay
Boiler
Supply
Sensor
082
System
Pump
ModulatingBoiler
654

ASnowMeltingControl654operatesahydronicsnowmeltingsystemusingamodulatingboilerandasystempump.The
boilerispipedinprimary-secondarytothesnowmeltsystemtoallowthesystempumptooperatecontinuouslyduringmelting
oridlingwhileallowingtheboilerandboilerpumptoturnonandoffasrequired.Theboilerfiringrateismodulatedusinga
0-0V(dc)or4-20mAsignal.Theslabisheatedtomaintaintheslabtargettemperature.WhenaSnow/IceSensor090is
installed,thesystemautomaticallystartswhensnoworiceisdetectedandcontinuestorununtiltheslabisdry.WhenaSnow
Sensor095isinstalledtogetherwithaSlabSensor072,thesystemautomaticallystartswhensnowisdetectedandrunsona
timerbeforeshuttingoff.AllsystemscanbemanuallystartedandshutoffusingatimerwheneitheraSnow/IceSensor090or
aSlabSensor072isinstalled.

 
APPMODE BOIL
BOILTYPE MOD(modulatingboiler)
AUXRELAY SYS(systempump)



Autostart/Autostop Snow/IceSensor090
2 Autostart/Timedstop SnowSensor095&SlabSensor072
3 Manualstart/Timedstop SlabSensor072
 

5of56 ©203WattsRadiant
Snow/Ice
Sensor090
Outdoor
Sensor
070
Supply
Sensor
082
Relay
System
Pump
Relay
Optional
tN4
Communication
Snow
Sensor095
Slab
Sensor072
Slab
Brn
Slab
Brn
Com
BlkYel Blu Red
Com
BlkYel Blu Red
Or And/Or
C tN4
Modulating
Boiler
T
T
–+
Transformer
L
N
C
R
Snow
Sensor
095
Slab
Brn
+
Mod
tN4Aux Ht R C
Bret
Out/
Com–
BlkYel Blu Red Sup
No Power
5V(ac)
 
IOM-WR-Snow_Melting_Control-654328 6of56

AsinglezoneincludestwoSnow/IceSensors090forTandemSnow/IceDetectionforawidersnoworicedetectionareaand
backupshouldoneofthetwosensorsfail.Whensnoworiceisdetectedthesnowmeltingsystemisautomaticallystartedand
stopswhentheslabisdry.EachsensorrequiresaSnowMeltingControl654.ThemasterSnowMeltingControl654operates
ahydronicsnowmeltingsystemusingamodulatingboilerandasystempump.Theboilerispipedinprimary-secondaryto
thesnowmeltsystemtoallowthesystempumptooperatecontinuouslyduringmeltingoridlingwhileallowingtheboiler
andboilerpumptoturnonandoffasrequired.Theboilerfiringrateismodulatedusinga0-0V(dc)or4-20mAsignal.The
memberSnowMeltingControlmonitorstheSnow/IceSensorandrelaysthesensorinformationtothemastercontrolusing
tekmarNet
®
communication.
Outdoor
Sensor070
Relay Relay
Boiler
Supply
Sensor
082
System
Pump
ModulatingBoiler
Snow/Ice
Sensor090
654
Master
654
Member
Snow/Ice
Sensor090

 
APPMODE BOIL
BOILTYPE MOD(modulatingboiler)
AUXRELAY SYS(systempump)




Autostart/Autostop Snow/IceSensor090

 
APPMODE 090
 
7of56 ©203WattsRadiant
Outdoor
Sensor
070
Supply
Sensor
082
5V(ac)
Relay
System
Pump
Relay
ModulatingBoiler
T
T
–+
Transformer
L
N
C
R
Snow/Ice
Sensor090
654Member
654Master
Snow/Ice
Sensor090
Slab
Brn
+
Mod
tN4Aux Ht R C
Bret
Out/
Com–
BlkYel Blu Red Sup
No Power
Slab
Brn
+
Mod
tN4Aux Ht R C
Bret
Out/
Com–
BlkYel Blu Red Sup
No Power
 
IOM-WR-Snow_Melting_Control-654328 8of56

ASnowMeltingControl654operatesamodulatingsteamvalveandasystempump.Theheatsourcemaybeeitherdistrict
steamorasteamboiler.Theslabtemperatureiscontrolledbyadjustingthesteamvalvepositionusingananalog0to0
V(dc)or4to20mAsignal.Theslabisheatedtomaintaintheslabtargettemperature.WhenaSnow/IceSensor090is
installed,thesystemautomaticallystartswhensnoworiceisdetectedandcontinuestorununtiltheslabisdry.WhenaSnow
Sensor095isinstalledtogetherwithaSlabSensor072,thesystemautomaticallystartswhensnowisdetectedandrunsona
timerbeforeshuttingoff.AllsystemscanbemanuallystartedandshutoffusingatimerwheneitheraSnow/IceSensor090or
aSlabSensor072isinstalled.

  
Autostart/Autostop Snow/IceSensor090
2 Autostart/Timedstop SnowSensor095&SlabSensor072
3 Manualstart/Timedstop SlabSensor072

 
APPMODE MIX
BOILTYPE OFF
AUXRELAY SYS(systempump)
Outdoor
Sensor070
Relay
Mix
Supply
Sensor
082
DistrictSteam
System
Pump
Modulating
SteamValve
654
Option
Snow/Ice
Sensor090
Option2
SnowSensor095and
SlabSensor072
Option3
SlabSensor072
 
9of56 ©203WattsRadiant
5V(ac)
Snow/Ice
Sensor090
Outdoor
Sensor
070
Supply
Sensor
082
Relay
Optional
tN4
Communication
Snow
Sensor095
Slab
Sensor072
Slab
Brn
Slab
Brn
Com
BlkYel Blu Red
Com
BlkYel Blu Red
Or And/Or
Snow
Sensor
095
Slab
Brn
+
Mod
tN4Aux Ht R C
Bret
Out/
Com–
BlkYel Blu Red Sup
No Power
Modulating
SteamValve
System
Pump
–
+
C
tN4
Transformer
L
N
R
C
 
IOM-WR-Snow_Melting_Control-654328 0of56

Acarwashcanhaveupto2baysandapronseachhavinganicemeltingsystemoperatedbyaSnowMeltingControl654.A
boilerorwaterheaterheatsastoragetankwhichisusedforhotwatertowashvehiclesandheattheicemeltingsystem.The
controlusesaSlabSensor072tomeasuretheslabtemperatureandoperatesthezonetoensuretheslabisabovefreezing.
Aprogrammablescheduleisusedtooperatetheicemeltingsystemduringthecarwashbusinesshoursandshutsoffthe
systemwhenthecarwashisclosed.

 
APPMODE PWM
BOILTYPE OFF
AUXRELAY SYS(systempump)
OUT/BRET OUT

 
APPMODE PWM
BOILTYPE OFF
AUXRELAY SYS(systempump)
OUT/BRET OFF
 
Outdoor
Sensor
070
Freeze
Protection
Aquastat
Zone2
Pump
Boiler
System
Pump
Slab
Sensor072
Zone
Pump
Relay
Zone
Zone2
654
654
Slab
Sensor072
Relay
Relay
Supply
Sensor082
Supply
Sensor082
of56 ©203WattsRadiant
Outdoor
Sensor
070
Freeze
Protection
Aquastat
Zone
Pump
Relay
Transformer
L
N
5V(ac)
Relay Relay
Zone2
Pump
System
Pump
Supply
Sensor
082
Zone Zone2
Supply
Sensor
082
Slab
Sensor
072
Slab
Sensor
072
C R
Slab
Brn
+
Mod
tN4Aux Ht R C
Bret
Out/
Com–
BlkYel Blu Red Sup
No Power
Slab
Brn
+
Mod
tN4Aux Ht R C
Bret
Out/
Com–
BlkYel Blu Red Sup
No Power
 
IOM-WR-Snow_Melting_Control-654328 2of56

Anelectricsnowmeltingsystemhasupto2zones.Zonehaspriorityoverzones2through2.EachSnowMeltingControl
654isconnectedtoanelectricalcontactorwhichinturnenergizestheelectriccables.Wheneverthezoneelectricalcontactor
isshutoff,zone2isabletooperate.Eachslabisheatedtomaintainitsslabtargettemperature.WhenaSnow/IceSensor
090isinstalled,thesystemautomaticallystartswhensnoworiceisdetectedandcontinuestorununtiltheslabisdry.Whena
SnowSensor095isinstalledtogetherwithaSlabSensor072,thesystemautomaticallystartswhensnowisdetectedandruns
onatimerbeforeshuttingoff.AllsystemscanbemanuallystartedandshutoffusingatimerwheneitheraSnow/IceSensor
090oraSlabSensor072isinstalled.

 
APPMODE ELEC
OUT/BRET OUT
PRIORITY COND(conditional)

 
APPMODE ELEC
OUT/BRET OFF
PRIORITY COND(conditional)



Autostart/Autostop Snow/IceSensor090
2 Autostart/Timedstop SnowSensor095&SlabSensor072
3 Manualstart/Timedstop SlabSensor072
Outdoor
Sensor070
Electrical
Power
Supply
Zone
Zone2
654
654
Option
Snow/IceSensor090
Option2
SnowSensor095andSlab
Sensor072
Option3
SlabSensor072
Alert
Equipment
Alert
Equipment
Option
Snow/IceSensor090
Option2
SnowSensor095andSlab
Sensor072
Option3
SlabSensor072
 
ProMelt
Contactor
ProPanel
Electrical
Power
Supply
ProMelt
Contactor
ProPanel
3of56 ©203WattsRadiant
Snow/Ice
Sensor090
Outdoor
Sensor
070
Zone
Zone2
ProMelt
Contactor
ProPanel
CP-50
CP-00
CP-200
ProMelt
Contactor
ProPanel
CP-50
CP-00
CP-200
Optional
Alert
Equipment
Optional
Alert
Equipment
Snow
Sensor095
Slab
Sensor072
Snow/Ice
Sensor090
Snow
Sensor095
Slab
Sensor072
Slab
Brn
Slab
Brn
Com
BlkYel Blu Red
Com
BlkYel Blu Red
Or And/Or
24V C PM
Slab
Brn
Slab
Brn
Com
BlkYel Blu Red
Com
BlkYel Blu Red
Or And/Or
24V C PM
Snow
Sensor
095
Slab
Brn
+
Mod
tN4Aux Ht R C
Bret
Out/
Com–
BlkYel Blu Red Sup
No Power
Slab
Brn
+
Mod
tN4Aux Ht R C
Bret
Out/
Com–
BlkYel Blu Red Sup
No Power
Snow
Sensor
095
 
IOM-WR-Snow_Melting_Control-654328 4of56

-----------------------------------------------------------------------------------------
Jewellerscrewdriver
Phillipsheadscrewdriver
•
•
Needle-nosePliers
WireStripper
•
•

-------------------------------------------------------------------------------------
8AWGLVTSolidWire(LowVoltageConnections)•
24V(ac)Transformer
•
Whenchoosingthelocationforthecontrol,considerthe
following:
InteriorWall.
Keepdry.Avoidpotentialleakageontothecontrol.
RelativeHumiditylessthan90%.Non-condensing
environment.
Noexposuretoextremetemperaturesbeyond-4to
22°F(-20to50°C).
Nodraft,directsun,orothercauseforinaccurate
temperaturereadings.
•
•
•
•
•
Awayfromequipment,appliances,orothersourcesof
electricalinterference.
Easyaccessforwiring,viewing,andadjustingthedisplay
screen.
Approximately5feet(.5m)offthefinishedfloor.
Themaximumlengthofwireis500feet(50m).
Stripwireto3/8"(0mm)forallterminalconnections.
Usestandard8conductor,8AWGwire.
•
•
•
•
•
•

-------------------------------------------------------------------------------------
Eachcablemustbepulledfromtheequipmenttothecontrol’s
plasticenclosure.Alllowvoltagewiringconnectionsenter
theenclosurethroughthesquareknockoutontherear.Itis
recommendedtolabeleachcableforeasyidentification.All
lowvoltagewiresaretobestrippedtoalengthof3/8"(9mm)
toensureproperconnectiontothecontrol.


SnowSensor095


Snow/IceSensor090
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

24V(ac)powerfromtransformer
Outdoortemperaturesensor
Supplysensor(ifapplicable)
On/offboiler(ifapplicable)
Modulatingboiler0-0V(dc)or4-20mA(ifapplicable)
Mixingvalveormixinginjectionpump0-0V(dc)or4-20
mA(ifapplicable)
Boilerreturntemperaturesensor(ifapplicable)
Alertoutput(ifapplicable)
tekmarNet
®
4communicationtootherdevices
Slabsensor072(ifapplicable)
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FrontView
5"
(127 mm)
3-1/4"
(82 mm)
SideView
15/16"
(23 mm)
MountingBase
654
Slab
Brn
+
Mod
tN4Aux Ht R C
Bret
Out/
ComCom
BlkYel Blu Red Sup
No Power
1-1/2"
(38 mm)
9/16"
(14 mm)
CL
1-7/8"
(47 mm)
3/4"
(19 mm)
CL
CL
13/16"
(20 mm)
4"
(102 mm)
2-1/2"
(64 mm)
29/32"
(23 mm)
3-1/4"
(83 mm)





5of56 ©203WattsRadiant
Snow/Ice
Sensor090
Slab
Brn
+
Mod
tN4Aux Ht R C
Bret
Out/
Com–
BlkYel Blu Red Sup
No Power
Snow
Sensor095
Slab
Sensor072
Slab
Brn
+
Mod
tN4Aux Ht R C
Bret
Out/
Com–
BlkYel Blu Red Sup
No Power
Snow
Sensor
095
Thecontrolrequiresanexternaltransformer.Thetotalpowercapacityofthepowersupplyshouldbelargerthanthetotal
loadofallthedevicesconnectedtothecontrol.Thistotalloadmustnotexceed00VA.

-----------------------------------

------------------------------

----------
Outdoor
Sensor
070
or
Boiler
Return
Sensor
082
Supply
Sensor
082
Slab
Brn
+
Mod
tN4Aux Ht R C
Bret
Out/
Com–
BlkYel Blu Red Sup
No Power

---------
ModulatingBoiler
MixingValveor
MixingInjectionPump
0-0V(dc)Signal
tekmarNet
®
4
Communication
– +
tN4 C
Slab
Brn
+
Mod
tN4Aux Ht R C
Bret
Out/
Com–
BlkYel Blu Red Sup
No Power


(ifapplicable)
IOM-WR-Snow_Melting_Control-654328 6of56

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
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Relay
System
Pump
Relay
Transformer
L
N
C
R
On/OffBoiler
TT
Slab
Brn
+
Mod
tN4Aux Ht R C
Bret
Out/
Com–
BlkYel Blu Red Sup
No Power
5V(ac)
7of56 ©203WattsRadiant
Thetemperaturesensor(thermistor)isbuiltintothesensor
enclosure.
Removethescrewandpullthefrontcoveroffthesensor
enclosure.
Theoutdoorsensorcaneitherbemounteddirectlyontoa
wallora2
"
x4
"
electricalbox.Whentheoutdoorsensoris
wallmounted,thewiringshouldenterthroughthebackor
bottomoftheenclosure.Donotmounttheoutdoorsensor
withtheconduitknockoutfacingupwardsasraincouldenter
theenclosureanddamagethesensor.
Inordertopreventheattransmittedthroughthewallfrom
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affectingthesensorreading,itmaybenecessarytoinstall
aninsulatingbarrierbehindtheenclosure.
Theoutdoorsensorshouldbemountedonawallwhichbest
representstheheatloadonthebuilding(anorthernwall
formostbuildingsandasouthernfacingwallforbuildings
withlargesouthfacingglassareas).Theoutdoorsensor
shouldnotbeexposedtoheatsourcessuchasventilation
orwindowopenings.
Theoutdoorsensorshouldbeinstalledatanelevation
abovethegroundthatwillpreventaccidentaldamage
ortampering.
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
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Sensorwithbottom
entrywiring
Sensorwithrear
entrywiring
Sensormounted
onto2"x4"
electricalbox
Connect8AWGorsimilarwiretothetwoterminalsprovidedinthe
enclosureandrunthewiresfromtheoutdoorsensortothecontrol.Do
notrunthewiresparalleltotelephoneorpowercables.Ifthesensor
wiresarelocatedinanareawithstrongsourcesofelectromagnetic
interference(EMI),shieldedcableortwistedpairshouldbeusedor
thewirescanberuninagroundedmetalconduit.Ifusingshielded
cable,theshieldwireshouldbeconnectedtotheComterminalon
thecontrolandnottoearthground.
Followthesensortestinginstructionsinthisbrochureandconnect
thewirestothecontrol.
Replacethefrontcoverofthesensorenclosure.
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
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Wires from outdoor
sensor to control’s
outdoor sensor and
sensor common
terminals
Sensor is built into
the enclosure

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
Thesesensorsaredesignedtomountonapipeorinatemperature
immersionwell.
TheUniversalSensorshouldbeplaceddownstreamofapumporafter
anelboworsimilarfitting.Thisisespeciallyimportantiflargediameter
pipesareusedasthethermalstratificationwithinthepipecanresultin
erroneoussensorreadings.Propersensorlocationrequiresthatthefluid
isthoroughlymixedwithinthepipebeforeitreachesthesensor.

TheUniversalSensorcanbestrappeddirectlytothepipeusingthe
cabletieprovided.Insulationshouldbeplacedaroundthesensorto
reducetheeffectofaircurrentsonthesensormeasurement.
IOM-WR-Snow_Melting_Control-654328 8of56
Agoodqualitytestmetercapableofmeasuringupto5,000
kΩ(kΩ=000Ω)isrequiredtomeasurethesensor
resistance.Inadditiontothis,theactualtemperaturemust
bemeasuredwitheitheragoodqualitydigitalthermometer,
orifathermometerisnotavailable,asecondsensorcan
beplacedalongsidetheonetobetestedandthereadings
compared.
Firstmeasurethetemperatureusingthethermometerand
thenmeasuretheresistanceofthesensoratthecontrol.The
wiresfromthesensormustnotbeconnectedtothecontrol
whilethetestisperformed.Usingthechartbelow,estimate
thetemperaturemeasuredbythesensor.Thesensorand
thermometerreadingsshouldbeclose.Ifthetestmeterreads
averyhighresistance,theremaybeabrokenwire,apoor
wiringconnectionoradefectivesensor.Iftheresistanceis
verylow,thewiringmaybeshorted,theremaybemoisture
inthesensororthesensormaybedefective.Totestfor
adefectivesensor,measuretheresistancedirectlyatthe
sensorlocation.
       
  
-50 -46 490,83 20 -7 46,28 90 32 7,334 60 7 ,689
-45 -43 405,70 25 -4 39,93 95 35 6,532 65 74 ,538
-40 -40 336,606 30 - 34,558 00 38 5,828 70 77 ,403
-35 -37 280,279 35 2 29,996 05 4 5,20 75 79 ,28
-30 -34 234,96 40 4 26,099 0 43 4,665 80 82 ,72
-25 -32 96,358 45 7 22,763 5 46 4,84 85 85 ,073
-20 -29 65,80 50 0 9,900 20 49 3,760 90 88 983
-5 -26 39,403 55 3 7,436 25 52 3,383 95 9 903
-0 -23 8,08 60 6 5,3 30 54 3,050 200 93 829
-5 -2 00,22 65 8 3,474 35 57 2,754 205 96 763
0 -8 85,362 70 2 ,883 40 60 2,490 20 99 703
5 -5 72,98 75 24 0,50 45 63 2,255 25 02 648
0 -2 62,465 80 27 9,299 50 66 2,045 220 04 598
5 -9 53,658 85 29 8,250 55 68 ,857 225 07 553
SensorWell
Universal
Sensor

IfaUniversalSensorismountedonto"(25mm)diameterLtypecopperpipe,there
isapproximatelyan8seconddelaybetweenasuddenchangeinwatertemperature
andthetimethesensormeasuresthetemperaturechange.Thisdelayincreases
considerablywhenmildsteel(blackiron)pipeisused.Ingeneral,itisrecommended
thatatemperaturewellbeusedforsteelpipeofdiametergreaterthan-/4"(32mm).
Temperaturewellsarealsorecommendedwhenlargediameterpipesareusedandfluid
stratificationispresent.

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. Removethefrontcoverfromthecontrol.
2. Useanelectricaltestmetertomeasure(ac)voltagebetweentheRandCterminals.Thereadingshouldbe24V(ac)
+/–0%.
3. Installthefrontcover.

---------------------------
ThecontrolincludesanOverridemenutocheckifthecontrol’s
relaysareoperatingandthatthecontroliswiredcorrectlyto
thesnowmeltingequipment.
Step:
PressandholdtheHomebuttonfor3seconds.
Step2:
PressNEXTtonavigatetotheOverridemenu.
Step3:
PressENTERtoentertheOverridemenu.
Step4:
SelectManualOverridetoHand.
Step5:
Forhydronicsystems,setSystemPumptoOn.The
systempumpshouldnowbeoperating.
Step6:
SetHeatRelaytoOn.Theboilerorelectricheatingcables
shouldstartheating.
Step7:
FormodulatingboilerschangetheBoilerPercentfrom
0to00%.Theboilershouldbefiring.
Step8:
Foramixingvalveormixinginjectionpump,changethe
MixPercentfrom0to00%.Themixingvalveshouldopen
orthemixinginjectionpumpshouldincreasespeed.
Step9:
SelecttheOverrideTimeafterwhichthecontrolresumes
normaloperation.
Step0:
ExittheManualOverridebyselectingAuto.




9of56 ©203WattsRadiant
Inhydronic application modes,thecontrol includesa
MaximumHeatoperationwherethecontroloperatesthe
snowmeltingsystemtomaintainthemaximumallowed
heatingsetpoints.Thisallowstestingofthesnowmelting
systemduringwarmweather.
Step:
PressandholdtheHomebuttonfor3seconds.
Step2:
PressNEXTtonavigatetotheOverridemenu.
Step3:
PressENTERtoentertheOverridemenu.
Step4:
SelectManualOverridetoMax.
Step5:
SelecttheMaximumHeatTimeafterwhichthecontrol
resumesnormaloperation.
Step6:
ExittheManualOverridebyselectingAuto.
Whenoperatingahydronicsnowmeltingsystem,itisnecessary
topurgeandbleedallairoutofthesystem.Thecontrolincludes
aPurgeoperationwheretheSystemPumpaswellaspumps
operatedbythetekmarNet
®
systemareallturnedontoassist
inpurgingairfromthesystem.
Step:
PressandholdtheHomebuttonfor3seconds.
Step2:
PressNEXTtonavigatetotheOverridemenu.
Step3:
PressENTERtoentertheOverridemenu.
Step4:
SelectManualOverridetoPurge.
Step5:
SelecttheMaximumPurgeTimeafterwhichthecontrol
resumesnormaloperation.
Step6:
ExittheManualOverridebyselectingAuto.
Thesnowmeltingsystemcanbemanuallyturnedoffandthe
controlremainsoffuntilmanuallychangedbacktoAuto.This
allowstheinstallerorendusertopermanentlydisablethesnow
meltingsystemwithoutremovingpowerfromthecontrol.
Step:
PressandholdtheHomebuttonfor3seconds.
Step2:
PressNEXTtonavigatetotheOverridemenu.
Step3:
PressENTERtoentertheOverridemenu.
Step4:
SelectManualOverridetoOff.
Step5:
ExittheManualOverridebyselectingAuto.
Whenoperatinganelectricsnowmeltingsystem,thecontrol
includesaTestoperationwheretheelectricalheatingcables
canbeenergizedfor0minutesafterwhichthecontrolresumes
normaloperation.Thisallowstestingoftheelectricsnowmelting
systemduringwarmweather.
Step:
PressandholdtheHomebuttonfor3seconds.
Step2:
PressNEXTtonavigatetotheOverridemenu.
Step3:
PressENTERtoentertheOverridemenu.
Step4:
SelectManualOverridetoTest.
Step5:
ExittheManualOverridebyselectingAuto.




ON

Thecontrolislocallylockedandtheaccesslevelcannotbechanged.
SettoLockwheninstallationhasbeencompleted.
OFF

Thecontrolisunlockedandtheaccesslevelmaybechanged.Goto
theToolboxmenutochangetheaccesslevel.SettoUnlockduring
theinstallationprocess.
ForsystemsthatincludeatekmarNet
®
systemcontrol:Setthe
tekmarNet
®
systemcontroltounlocktoallowaccessleveladjustment
onallconnecteddevices.
2
ON
Notused
OFF
Notused
Meets Class B: ICES & FCC Part 15
Power: 24 V (ac) ±10%, 60 Hz, Class 2,
16 VA standby, 100 VA fully loaded
Relays: 24 V (ac) 2 A, 3.5 A combined
1058-04
Switch
Settings
www.WattsRadiant.com
Order #81016552
Designed and assembled in Canada
Lock
Unused
Unlock
ON
2
H1226A
Snow Melting Control 654
BackofControl




IOM-WR-Snow_Melting_Control-654328 20of56



ENTER
HomeButton
ReturntotheHomeScreen
Pressandholdfor3
secondstoaccessthe
programmingmenus.
Touchtogotothenextsetting
Touchtoquicklyenter
theViewmenu
Touchtoadjustsettings
OperationField
StatusField
Touchtodisplay
RunTime,
Outdoor&Slab
Temperature
Touchto
MeltorStop
Touchtoturnsystem
offwhileaway
MELT Systemismeltingsnoworice.
IDLE Systemisidling.
STRM Systemisinstormoperation.
OFF Systemisoff.
WWSD
WarmWeatherShutDown.Theslabisnaturally
warmenoughtomeltsnoworice.
CWCO ColdWeatherCutOut.Toocoldtomelt.
TIMED
Timedmeltingoperation.Systemoperatesuntil
timehaselapsed.
WARM Slabiswarminguptothemeltingtemperature.
AWAY
Awayscene.Nomeltinguntiltheawaysceneis
exited.
PEND
Pending.Thesystemhasdetectedwaterbutitistoo
coldtooperateorthescheduleisinIdleorOff.
WAIT
Zonepriorityineffect.Zonemustwaituntilhigher
priorityzonefinishesmelting.
SENSOR Tandem090sensor.
TRACK
Thiszonetracksthemeltingoperationofzone.





Heatisturnedon.

Communicationispresent.

Indicatesanerrorispresent.

Adjustthedisplayedsetting.
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Watts 654 Installation guide

Watts
Brand
Watts
Model
654
Category
Thermostats
Type
Installation guide
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