HITESCA SMT-770 User guide

Installer Manual
SMT-770 Chameleon Mulfuncon Thermostat
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
f
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

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AveragingTemperatureSensors
Set“TT=AV”intheadvancedinstallermenu.
TheSMT‐770canaveragethesensedtemperatureequallybetweentheremote
temperaturesensor(s)andtheonefittedtotheSMT‐770ifrequired.Seefigure1on
thepreviouspagefordetailsonwiringthesensor.TheSMT‐770willauto‐detectthis
sensorandautomaticallyaveragethetwosensorsvaluestocontroltheroom
temperature.

RemoteON/OFFFunction
Set“TT=OF”intheadvancedinstallermenu.
TheSMT‐770canbeconnectedtoanexternaldrycontact.Whenthis
contactisclosedtheSMT‐770willturnOFF.Seefigure3.WhentheSMT‐770hasbeen
switchedOFFviathe“TT”terminalstheword“OFF”willflashintheLCDtoindicatethat
thishasbeentheshutdownmethod.TheSMT‐770willreturntotheusersettingswhen
thisswitchisopen.

Usingthe“OccupancyMode”
Set“TT=OC”intheadvancedinstallermenu.
TheSMT‐770canalternatebetweentheuserpreferredsetpointsandaninstallerpre
programmedsetpointwhenrequired.SimplywirearemoteswitchtotheSMT‐770
“TT”terminals(seefigure3).Whentheswitchisopentheusersettingswillcontrolthe
roomtemperature.WhentheswitchisclosedtheInstaller“Oc”(OccupiedCooling
value)&“Oh”(OccupiedHeatingvalue)settingswillbeusedtocontroltheroom
temperature.
Figure3

12|Page

SupplyAirTemperatureMonitoring
Set“TT=DA”intheadvancedinstallermenu.
Inthismode,theSMT‐770willbroadcastthissensortemperaturevaluetoModBus
ONLY,thisvalueisnotusedbytheSMT‐770norisitdisplayedontheLCD.Itisexpected
thatthisinformationisusedforsupervisoryfunctionsorequipmentcontrolfeedback.
Also,asthisisananalogueinput,bymonitoringaswitchedresistornetworkyour
supervisorysoftwarecandecodeanumberofdigitalstates.

TypicalDrawings

TheSMT‐770hasthecapacitytocontrolawideselectionofheating,coolingandair
conditioningsystems.Usingthe8DIPswitchesandmanyinstallersoftwareoptions,the
SMT‐770iscapableofprovidingmanydifferentcontrolmethodsfromits5fittedrelays.
Examplesofonlythemostcommontypesofcontrolwiringhavebeenprovidedbelow.

Youmayneedtomodifythesedrawingsslightlytospecificallysuityourindividual
needs,alternativelycontactSmartTempat[email protected]oran
authoriseddistributorforinstallationinformationspecifictoyourapplication.


13|Page










SwitchSettings
Sw1=Off(1speedfan)
Sw2=Off(HCSystem)
Sw3=Off(SingleStage)
Sw4=Off(HG)
Sw5=Installerpreference
Sw6=Userrequirements
Sw7=Installerpreference
Sw8=Userrequirements
Tip
SetInstallermenuFn=H





SwitchSettings
Sw1=Off(1speedfan)
Sw2=Off(HCSystem)
Sw3=Off(SingleStage)
Sw4=N/A
Sw5=Installerpreference
Sw6=Userrequirements
Sw7=Installerpreference
Sw8=Userrequirements
Tip
SetInstallermenuFn=C

Figure4
Figure5

14|Page




SwitchSettings
Sw1=Off(1speedfan)
Sw2=Off(HCSystem)
Sw3=Off(SingleStage)
Sw4=Off(HG)
Sw5=Installerpreference
Sw6=Userrequirements
Sw7=Installerpreference
Sw8=Userrequirements
















SwitchSettings
Sw1=Off(1speedfan)
Sw2=Off(HCSystem)
Sw3=On(TwoStage)
Sw4=Off(HG)
Sw5=Installerpreference
Sw6=Userrequirements
Sw7=Installerpreference
Sw8=Userrequirements



Figure6
Figure7

15|Page






SwitchSettings
Sw1=Off(1speedfan)
Sw2=On(HPSystem)
Sw3=Off(OneStage)
Sw4=OnHeat(B)/OffCool(O)
Sw5=Installerpreference
Sw6=Userrequirements
Sw7=Installerpreference
Sw8=Userrequirements

Note–SetSW4tosuit
suitthesystem














SwitchSettings
Sw1=Off(1speedfan)
Sw2=On(HPSystem)
Sw3=Off(OneStage)
Sw4=OnHeat(B)/OffCool(O)
Sw5=Installerpreference
Sw6=Userrequirements
Sw7=Installerpreference
Sw8=Userrequirements
Note–SetSW4tosuit
suitthesystem

Figure8
Figure9

16|Page














SwitchSettings
Sw1=Off(1speedfan)
Sw2=On(HPSystem)
Sw3=Off(OneStage)
Sw4=OnHeat(B)/OffCool(O)
Sw5=Installerpreference
Sw6=Userrequirements
Sw7=Installerpreference
Sw8=Userrequirements

Note–SetSW4tosuit
suitthesystem




SwitchSettings
Sw1=Off(1speedfan)
Sw2=On(HPSystem)
Sw3=On(TwoStage)
Sw4=OnHeat(B)/OffCool(O)
Sw5=Installerpreference
Sw6=Userrequirements
Sw7=Installerpreference
Sw8=Userrequirements

Note:SetW3=EH
intheinstallermenu.


Figure10
Figure11

17|Page

Figure12
SwitchSettings
Sw1=Off(1speedfan)
Sw2=Off(HCSystem)
Sw3=Off(SingleStage)
Sw4=Off(HG)
Sw5=Installerpreference
Sw6=Userrequirements
Sw7=Installerpreference
Sw8=Userrequirements
Tip
SetInstallermenuFn=H





SwitchSettings
Sw1=Off(1speedfan)
Sw2=Off(HCSystem)
Sw3=On(TwoStage)
Sw4=Off(HG)
Sw5=Installerpreference
Sw6=Userrequirements
Sw7=Installerpreference
Sw8=Userrequirements

Figure13

18|Page

Attachingthethermostat

Checkthatthepositionofthe8DIPswitchesmatchestherequirementsofthe
equipmentbeingcontrolledandthespecificrequirementsoftheuser.Detailed
informationonthe8DIPswitchescanbefoundonpage6ofthismanual.

CheckthewiringmatchesthatoftheequipmenttheSMT‐770istocontrolandthatall
wiringistightandnotlikelytoshortbetweenadjacentwires.Equipmentwiring
informationcanbefoundonpage12ofthismanual.

IfusingtheModBuscommunicationcapabilityoftheSMT‐770,
ensurethe“A”,“B”&“T”datawiresareinthecorrectpositionas
anerrorheremayaffectthecommunicationoftheentire
network.Seepage38fordetailedwiringofthecommunications
portoftheSMT‐770.

Usingmaskingtapeorsimilar,blocktheholeinthewall
wherethewiringentersthebackofthethermostatto
preventdraftsthatmaytraveldowntheinsideofthewall
cavityaffectingtheaccuracyoftheinternallyfittedtemperaturesensor.

Figure14

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
Removeanddiscardtheplastictabontheinternallyfittedbackupbatterysothatthe
batteryisnowincircuitandoperating.Takecarenottodamagethebatteryholder
whendoingthis.

Whenattachingthethermostattothebase,avoidtwistingthecaseasthismaystress
theLCDandcauseittocrack.Avoidrunningwiringneartheinternallyfittedsensor.

Takecarenottodamageorcrushthetemperaturesensorbetweenthetwohalf’sof
thecasewhenyouclosetheChameleoncase.Checkthissensorlocation.
AdvancedInstallerSettings

TheSMT‐770isfittedwithmanyadvancedfunctionsthatcanbefinetunedbythe
installertospecificallymatchtheneedsoftheprojectoftheuser.

Normallythesefunctionswillnotneedtobealteredfromthefactorydefaultposition
however,theremaybetimeswhenyouwishtoalterasettingorcontrolcapabilityso
thattheSMT‐770performancewillperfectlymatchaparticularapplication.Onthenext
fewpagesthereisdetailedexplanationofthesefunctionsandtheirrangeofcontrol.

Whileintheadvancedinstallermenu,allSMT‐770equipmentcontrolfunctionswillbe
suspended.Normalequipmentoperationwillcontinuewhenyouhaveexitedthismenu
(afteranyanticycledelaysorsafetydelayshaveterminated).