Smart temp SMT?770 User guide

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InstallerManual
SMT‐770ChameleonMultifunctionThermostat
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Ver3.0

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Thisdocumentitnottypicallyleftwiththeuserasitcontainsinformationonsetting
valueswhich,ifnotcorrectlysetmaydamagetheheating,coolingorairconditioning
systemorseriouslyaffectitsperformanceorenergyconsumption.
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GreatefforthasbeentakentomakingtheSMT‐770thermostatsystemintuitive,
reliableandeasytoinstall.Usingacommonsenseapproachtotheinstallationwill
ensurethisproductisinstalledeasilyandtothecustomer’ssatisfaction.Pleaseread
andunderstandthisinstructionmanualsothatinstallation,testingandcommissioning
processisundertakeninanefficientandeffectivemanner.
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Thismanualistobeusedinconjunctionwiththesuppliedusermanual.
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Greatcarehasbeentakeninthepreparationofthismanual.SmartTempAustraliaP/Ltakesno
responsibilityforerrorsoromissionscontainedinthisdocument.Itistheresponsibilityoftheuser
toensurethisthermostat,ortheequipmentconnectedtoitisoperatingtotheirrespective
specificationsandinasafemanner.
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DuetoongoingproductimprovementSmartTempAustraliaP/Lreservestherighttochangethe
specificationsoftheSMT‐770thermostat(oritscomponents)withoutnotice.
Allrightsreserved.©SmartTempAustraliaP/L2011
Intellectualrightsapply.

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TableofContents
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Installation..................................................................................................................4
Mountingthewallcontroller..............................................................................................5
Settingthehardwareswitches...........................................................................................6
TTTerminalFunctions..................................................................................................9
OutsideAirSensorwiring.................................................................................................10
RemoteAirTemperaturesensorwiring............................................................................10
AveragingTemperaturesensors.......................................................................................11
RemoteON/OFFfunction...............................................................................................11
Usingthe“OccupancyMode............................................................................................11
SupplyAirTemperatureMonitoring.................................................................................12
TypicalDrawings........................................................................................................12
Attachingthethermostat...........................................................................................18
AdvancedInstallerSettings........................................................................................19
Commissioning..........................................................................................................34
UsingRemoteTemperatureSensors...........................................................................37
AdvancedFunctions...................................................................................................38
Specifications.............................................................................................................43
SensorReferenceTable....................................................................................................43
Troubleshooting.........................................................................................................44
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Installation
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Aswithanyairconditioningprojectundertaken,carefulinstallationisthekeytoa
successfuloutcome.Timetakenduringthisinstallationprocesswillberewardedwitha
happycustomerandfewercall‐backs.
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ThestepsrequiredtoinstalltheSMT‐770thermostatare‐
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1. ReadandunderstandthismanualandtheUsermanual.
2. MounttheSMT‐770backplateinasuitablelocation.
3. Setthe8DIPswitchestomatchtheneedoftheproject/user.
4. Wiretheoptionalremotetemperaturesensor(s)orswitchesifrequired.
5. Poweruptheairconditioningsystem.
6. Settheinstallersoftwareoptions(ifrequired).
7. ProgramandsetuptheSMT‐770thermostat.
(TheUserManualwillassistwiththis).
8. Testtheheating,coolingandotherfunctions–Commissioning.
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Forconveniencethelayoutofthismanualisinthesameorderasthestepslistedabove.

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MountingtheSMT‐770thermostat.
TheSMT‐770canonlybeasaccurateastheonboardtemperaturesensor,orits
optionalremotetemperaturesensor(s)permit.ItisthereforeessentialthattheSMT‐
770beinstalledinalocationthatistypicaloftheambientroomtemperature.Donot
installthethermostatinadraft,nearafloor,behinddoorsoronanon‐insulated
externalwall.Alsoavoidplacingthethermostatinareaswheretheairmovementis
limited,affectedbydirectsunlightorotherareasnot“typical”ofthetemperatureof
theroom.
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Further,whenmountingtheSMT‐770beawarethatdrafts
maytraveldowntheinsideofcavitywalls,(especiallyif
mountedonexternalwalls)andenterthebackof
thethermostatorsensorenclosurethroughthe
cableentryholesinthewall.Itisimportanttofully
sealtheseholestopreventanydraftsaffectingthe
internallymountedtemperaturesensor.Itis
recommendedtomounttheSMT‐770orremotesensors
between1.5&1.7metresfromthefloorwherepossible.
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Movethecontrolwiresthroughthelargeopeninginthethermostatbaseplatethen
placethethermostatbaseonthewallandusingappropriatescrews,firmlyattachthe
thermostatbasetothewall.Blockanyholeswherecablesenterthebackofthe
thermostattopreventdraftsenteringthroughtheseholesaffectingthesensor.
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Settingthehardwareswitches
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SwitchOf
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On
Sw1–FanSpeeds1SpeedFan 3SpeedFan 
Sw2–EquipmentTypeHeatCool HeatPump(O/Bterminals)
Sw3–Stages1Stage2Stages
Sw4–ReversingValve
IfSw2=ON–HeatPump
Energiseincool(O) Energiseinheat(B)
Sw4–FanMode
IfSw2=OFF–Heat/cool
FanControlbyHeater(HG) FanControlbyT’stat(HE)
Sw5–AnticycletimerOff 4Minutes
Sw6–OperationManualThermostat ProgrammableThermostat
Sw7–MinimumRun2minutes 6Minutes
Sw8–ProgramType
IfSw6=ON–Programmable
CommercialProgram ResidentialProgram
Sw8–Setpoints
IfSw6=OFF–Manual
SingleSetpoint TwoSetpoints
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Typicaldrawingshavebeenprovidedonpage12ofthismanualthatwill
assistwiththeselectionofthecorrectpositionsforthesefunctionswitches.
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Switch1–RelayAssignment
TheSMT‐770isfittedwith5relayscapableofswitchingupto24VAC@1Amp.Switch1
setsthefunctionoftheserelaysaseither3fanspeedswith1heatand1cooloperation
orsinglefanspeedwith2heatand2cool,ineitherHP(heatpump/reversecycle)or
HC(heatwithaddoncool)mode.
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Switch2–EquipmentType.
Bothheatwithaddoncoolorheatpumptypesofsystemscanbecontrolledbythe
SMT‐770.
HeatCoolSystemusesthe“W”terminal(s)onlyforheatingandthe“Y”terminal(s)only
forcooling.
HeatPumpsystemsusethe“Y”terminal(s)forBOTHheatingandcooling(the
compressor).The“W1”terminaltocontrolthereversingvalvewhichdetermines
heatingorcoolingmode.
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Switch3–EquipmentStages.
WhenitisnecessarytocontrolasinglestageA/Csystemfittedwithauxiliaryheating
elements,turnSw3OFFtherebyselectingsinglestagemode.Heatingelements
controlledbytheW2outputarenowassignedasstage2heat.
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Switch4–ReversingValveorFanMode
WhentheSMT‐770issetforHeatPumpmode(Sw2ison)thenthisswitchsetsthe
reversingvalvelogic(O/B).WhentheSMT‐770issetforHeatCoolmode(Sw2isoff)
thenthisswitchsetsthemodefortheHeaterfanlogic(HGorHEmode).

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Switch5–AntiCycleTimer
ToprotectsomeA/Csystemsitispreferredthatundernocircumstancesshouldthe
compressorstartwithin4minutesofitswitchingoff.
Note:whenpowerisfirstappliedtotheSMT‐770it“assumes”thatthecompressorhas
juststoppedandappliesthisanticycledelaytimebeforestarting.
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Switch6–ThermostatOperation
Tosuitthevaryingrequirementsoftheuser,theSMT‐770canbesetasa
programmablethermostatusingthetimeclocktoautomaticallycontrolthebuilding
temperaturetoaprogrammedtemperatureprofileortotheverysimpletooperate
manualmodewheretheuserturnsthethermostatonoroffandadjuststhe
temperaturesetpointmanually.
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Switch7–MinimumRunTime.
ToconserveenergyandprotecttheA/Csystemitisrecommendedtolimitthenumber
oftimestheheatingand/orcoolingsystemcanrunin1hour.Thisswitchsetsthe
minimumheatingandcoolingequipmenttoaminimumruntimeof2or6minutes.
Oncetheheatingorcoolinghasstarteditmustrunforthisminimumsettime.TheLCD
willflashtheword“Heating”or“Cooling”wheneverthistimerisineffect.
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Switch8–ThermostatControlLogic.
Thisswitchalsohastwofunctionsbasedonthepositionofswitch6.Whenthe
SMT‐770issetasaprogrammablethermostat,switch8determineswhethera
commercialprogramorresidentialprogramisselected.Whenswitch6hasthe
SMT‐770usedasanonprogrammablethermostat,thisswitchsetssinglesetpoint
mode(imitatingasimplemechanicalthermostat)orwhetheraseparateheatingand
coolingsetpointcanbeselectedbytheuser.Twosetpointmodealsopermitstheuser
toselectaseparatedayandnightsetpointifrequired.
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TTTerminalFunctions
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TheSMT‐770isfittedwithasetofterminalsmarked“TT”.Detailsonthefunctionsthat
the“TT”terminalsperformisprovidedbelow.Seetheadvancedinstallersettingmenu
onpage19ofthismanualforsettingthefunctionofthissetofterminals.Thewiring
usedinthefollowingexamplesarenotpolaritydependentanddonotnormallyrequire
screenedcable.
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Note:TheSMT‐770canusemultiplesensorsifrequiredforaveraging.
Drawingsshowingthesevariousconfigurationsareshownonpage37ofthis
manual.
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OutsideAirSensorWiring
Set“TT=OA”intheadvancedinstallermenu.
TheSMT‐770candisplaytheoutsideairtemperatureif
desired.Someadvancedcontrolfunctionssuchashigh
andlowbalancepointsrelyonthissensortobefitted
forcorrectoperation.Usingasinglepairofwires
connectthe“TT”terminalsintheSMT‐770tothetwoterminalsintheoutsideair
temperaturesensor.(Seefigure1).Iftheoutsideairsensorfailstwodasheswillbe
shownontheLCDwheretheoutsideairtemperaturewouldnormallybedisplayedto
alertyouoftheproblem.
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RemoteAirTemperatureSensorWiring.
Set“TT=RS”intheadvancedinstallermenu.(Default)
Whenyouwishtomeasurethetemperaturefroma
locationdistantfromtheSMT‐770,simplyconnecta
remotetemperaturesensortothe“TT”terminalsin
theSMT‐770.ThiswillautomaticallydisablethesensorfittedtotheSMT‐770anduse
theremotetemperaturesensor(s)tocontroltheroomtemperature(Seefigure1
above).Shouldyouwish,youcaneasilyswitchtheremotetemperaturesensoronand
offtherebyswitchingtemperaturesensinglocationsbetweentheremotetemperature
sensorandtheSMT‐770temperaturesensorwhenrequired.Simplyfitaninlineswitch
inthesensorwiringororderSmartTemppartnumberRS‐01Ssensor.(SeeFigure2.)

Figure1
Figure2