heat-timer EPU-D - EPU-D Display and Programming; EPU-D Control Module Status Leds; Display and Variable-Function Buttons

EPU‐DDisplayandProgramming23
059840‐00Rev.AHeat‐TimerCorp.
EPU‐DDisplayandProgramming
EPU‐DControlModuleStatusLEDs
TheEPU‐DhasthreestatusLEDs:
ThefollowingtabledescribesthevariousstatusLEDcombinations.
DisplayandVariable‐FunctionButtons
TheEPU‐Ddisplayshowsthesystemsensortemperature
(whenSensorType=HeatingSystemSensor)orthe
outdoortemperature(whenSensorType=Pressuretrol)
andappropriateoperationmessages.See“DisplayIcons
andMessages”onpage 24formoreinformation.
Theareaabovethevariable‐functionbuttonsdisplaysthe
currentfunctionforeachbutton.
LED Description
CallforHeat RedLEDthatindicatestheoutdoortemperaturesensorcallsforheat.
IndoorSatisfied GreenLEDthatindicatesthesystemisincycle.
HeatCircEstab AmberLEDthatindicatesheatcirculationhasbeenestablished.
LED
Description
Red Amber Green
ON OFF OFF Theoutdoortemperaturesensorcallsforheat,butheatestablished/heating
systemsensortemperaturehasnotbeenreached.
ON ON ON Heatcirculationhasbeenestablished.TheCycle‐ONsegmentisbeingtimed.
OFF ON ON TheCycle‐OFFsegmentisbeingtimed.Heatisstillestablished.
OFF FLASH OFF TheEPU‐Disinthermallockout.Thecontrolwillnotcallforheatuntilthe
temperatureofthereturnpipedropsto25°Fbelowthesystemsetpointsetting.
OFF OFF ON Thesystemisincycle.
OFF OFF OFF IndicatesthecontrolseasonissettoWinterandtheoutdoortemperatureisabove
thesettingoftheoutdoortemperaturesensor.