THX9321/9421 P restige® IAQ and RF EIM
25 69-2490 —03
Delta T Fault Sensitivity is adjustable in the Installer Setup (ISU 13180)
Delta T diagnostics is only for non-zoned forced air systems.
Alerts and diagnostics
Maintainclosecontactwithyourcustomersbyprovidingmorecomfortandeffi-
ciencywithalertsanddiagnostics.Alertsandreminderscannotifycustomers
whenmaintenanceorserviceisneeded,anddisplayyourcontact informationto
makeiteasyforthemtoreachyou.Thefollowingareonly afewofmanyoptions.
Checkthethermostat'son-screenmenusformore.
Alerts and Faults Log
MENU > INSTALLER OPTIONS > DATA LOGS > ALERTS AND FAULTS LOG
Thethermostatsavesthemostrecent25alertsorfaults.It recordsthedate,time,
alertstatus(snoozed,dismissed,recovered),anddiagnosticinformationtohelp
youidentifyandcorrectproblems.
User Interaction Log
MENU > INSTALLER OPTIONS > DATA LOGS > USER INTERACTION LOG
Checkthislogtofindoutifaproblemwascaused byanaccidentalusererror.
Thelogshowsmostchangesmadetothermostatsettings,by timeanddate,and
describeswhatchangewasmade.
Thethermostatrecordsthemostrecent250changes.Youcanquicklysearch
thembydateandtime,orbyfunction.Thisfeaturecan beturnedoffifnecessary,
so that no user interactions are recorded.
Examples:
* [date, time] Heattemperaturesetto80°F
* [date, time] SystemmodesettoOff
* [date, time] Installersetup���changed—heatingequipmenttype
Delta T Diagnostics
MENU > INSTALLER OPTIONS > SET UP DIAGNOSTICS
Ifadischargeandreturnairsensorisinstalled,the thermostatcantrack
systemperformanceovertime.Itmeasuresthisas"DeltaT."
Thiscantellyouifthesystemisperformingabove orbelowexpectedstandards
whichwouldnormallygounnoticed,andmaycauseunnecessaryenergy use.It
canalsodetectandwarnaboutproblemsearly,beforeheatingorcooling
equipmentfails.
ThethermostatwillmeasureandrecordDeltaTofthesystemfor eachstage
youtest.Thisinformationcanbeusedtosetthe properDeltaTfaultlimitsofthe
system.Whenthesystemoperatesoutsidethoselimitsmultipletimes, afaultis
recordedinthelog.Ifconfiguredtodoso,thesystemwill thendisplayanalertto
thehomeowner.
69-2490_B.indd 25 7/13/2011 1:42:01 PM