Honeywell PRESTIGE THX9421 User Manual download pdf (Page 25)

THX9321/9421 Prestige

IAQ and RF EIM

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.

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Honeywell PRESTIGE THX9421 User Manual Page 25