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THX9321/9421 Prestige
®
IAQ and RF EIM
23
69-2490—03
Southern Dehumidification Away Mode
Thisfeaturelowersthetemperatureupto3°Fbelowthesetpointasneededto
preventexcessivehumiditywhilethehomeisunoccupied.
SouthernDehumidificationAwayModeoptions:(ISU9180to9200)
• FanControl:Auto,OnorCirculate
• LowLimitTemperatureSetting:Lowesttemperatureallowedtocontrol
humidity.
• TemperatureSetting:Temperatureismaintainedwhendehumidificationis
not needed.
• DehumidificationSetting:HumidityleveldesiredwhileDehumidification
AwayModeisactive.
Youcancontrolhumiditywithadehumidifieroracoolingsystem.Ifacooling
systemisused,humidityiscontrolledbycoolingindoorairtotheLowLimit
TemperatureSetting.Whenthedesiredhumiditylevelisreached,thesystemwill
maintaintheSouthernDehumidificationAwayModetemperaturesetting.
Ventilation
Thethermostatcanbesetforthefollowingventilationtypes:(ISU10000)
• ERV/HRV
• Passive(FanOnly)
• FreshAirDamper
Ventilation Control Methods(ISU10060)
• ASHRAE:OperationofventilationequipmentmeetstheASHRAE62.2
VentilationStandardbasedonCFM,numberofbedroomsandsquare
footageofhome.ASHRAE62.2isnotmetiftheuserprogramsthe
thermostattopreventventilationintheSleepprogramperiod.
• PercentonTime:Theventilatorrunsbasedonapercentagesetinthe
InstallerSetup.Forexample:ifsetto50%,theventilatorrunsatrandom
timesduringa1hourperioduntilitreachesa50%runtime(approximately
30minutes).
Ventilation — Outdoor Condition Lockouts(ISU10130).Theventilatorwillnot
operatewhenoutdoorconditionsexceedthelockoutsettings.Optionsare:
• VentilatorLowTemperatureLockoutSetpoint(Off,-20°to40°F)
• VentilatorHighTemperatureLockoutSetpoint(Off,80°to110°F)
• VentilatorHighDewpointLockoutSetpoint(Off,65°to85°F)
Ifsettoventilateonhighindoorhumidity,theventilatorturnsoniftheindoor
humidityis10%abovetheHumidificationsetting.(ISU10160).
To see all ventilation options, press MENU > INSTALLER OPTIONS > VIEW/EDIT CURRENT SETUP >
VENTILATION.
69-2490_B.indd 23 7/13/2011 1:42:01 PM