heat-timer EPU-D - Cycle Length

DetailedOperation5
059840‐00Rev.AHeat‐TimerCorp.
Whentheoutdoortemperaturedropsbelowthecutoff,theEPU‐Dwillautomaticallybegincontrollingthe
heatingcycle.Aftertheheatingsystemisactive,theheatingsystemsensorwillregisterwhenheathasreached
throughoutthebuilding.Thecombinedeffectofthesetwosensorsistoprovideaneven,comfortablelevelof
heatthroughoutthebuilding.
Figure3: ExampleCyclesBasedonWeatherConditions
CycleLength
ThedurationoftheCycle‐ONperiod(whentheheatsourceisactivated)dependsonfourfactors:
• Outdoortemperature
• OutdoorCutofftemperature
• HeatAdjustmentsetting
•Cyclelength
WhentheoutdoortemperatureisabovetheOutdoorCutoff,theEPU‐Dwillnotcallforheat.Whentheoutdoor
temperatureisbelowtheOutdoorCutoff,thelengthoftheCycle‐ONsegmentisadjustedbythedayandnight
HeatAdjustmentsettings.“A”istheshortestheatduration,“P”isthelongestduration.