heat-timer EPU-D User Manual

8EPU‐DInstallationandOperationManual
059840‐00Rev.A Heat‐TimerCorp.
TypicalConfigurations
TheEPU‐Dworkswithvirtuallyanynon‐vacuumoneortwo‐pipesteam‐heatedsystem.TheEPU‐Dcancontrol
theboilerdirectlytocreatesteamor,forsystemswhereacentralplantprovidessteam,theEPU‐Dcontrolsa
motorizedvalvetoalloworpreventsteamfromenteringtheheatingsystem.
Baseduponthespecificlayoutofthesteamheatingsystem,thereareseveraldifferencesinlocatingtheheating
systemsensorandintheoutputwiringtotheboilerormotorizedvalvethatmustbeconsidered.Itisimportant
tocarefullycheckthepipingdiagramtodeterminewhichofthefollowinglayoutsmatchesyourheatingsystem:
• OnePipeSteam‐DirectBurnerOperation(seeFigure 7onpage 38)
• Two‐PipeSteam‐DirectBurnerOperation(seeFigure 8onpage 39)
• Two‐PipeSteam‐MotorizedValveOperation(seeFigure 9onpage40)
EPU‐DInputs
HeatingSystemSensor
TheEPU‐DisdesignedtoconnecttotheprovidedHeat‐Timerheatingsystemsensor(p/n904220‐00).
Theheatingsystemsensorislocatedwhereitwillshowthatheathasreachedthefurthestlocationinthe
building.TheEPU‐Dusesthetemperatureinformationfromtheheatingsystemsensorcombinedwiththe
outdoortemperaturesensortocontroltheheatlevelinthebuilding.
PressuretrolSensor
TheEPU‐Dcanoptionallyconnecttoapressuretrolsensorinsteadofthesystemtemperaturesensor.
Thepressuretrolsensormustbeareverse‐actingpressuretrolthatindicateswhentostarttheheatingcycle
basedonaspecifiedpressuresetting.
OutdoorTemperatureSensor
TheEPU‐DisdesignedtoconnecttotheprovidedHeat‐Timertemperaturesensor(p/n904220‐00).
Theoutdoortemperaturesensorisasolid‐statesensorlocatedontheexteriorofthebuilding.TheEPU‐Duses
thetemperatureinformationfromtheoutdoortemperaturesensorcombinedwiththesystemtemperature
sensortocontroltheheatlevelinthebuilding.

heat-timer EPU-D Specifications

General

Brand	heat-timer
Model	EPU-D
Category	Control Panel
Language	English