The.SC3801.is.a.programmable,.auto.changeover,.two.stage.heat,.two.stage.cool.thermostat..It.functions.
with.air.conditioning,.heat.pumps,.gas,.oil,.or.electric.heat..
The.thermostat.activates.a.heating.appliance.when.the.room.temperature.is.below.the.set.heat.
temperature.(by.the.differential.temperature)..The.red.status.indicator.may.come.on.with.first.or.second.
stage,.depending.on.configuration..When.the.room.temperature.drops.further,.the.second.stage.(auxiliary).
heat.is.activated..The.heating.is.staged.off.when.the.room.temperature.increases..With.heat.pumps,.
the.thermostat.will.not.let.the.compressor.come.on.for.four.minutes.after.it.turns.off..This.protects.your.
compressor..Emergency.heat.mode.can.be.used.to.bypass.heat.pump.operation,.making.auxiliary.heat.first.
stage.
When.the.room.temperature.is.greater.than.the.set.cool.temperature.(by.the.differential.temperature),.the.
first.stage.cooling.device.is.activated..The.green.status.indicator.may.come.on.with.first.or.second.stage,.
depending.on.configuration..If.the.room.temperature.increases,.the.second.stage.cooling.device.will.be.
activated..The.cooling.is.staged.off.when.the.room.temperature.decreases..The.thermostat.will.not.let.the.
compressor.come.on.for.four.minutes.after.it.turns.off..This.protects.your.compressor.
The.SC3801.has.the.following.operating.modes:.OFF,.Heat,.Emergency.Heat,.Cool,.Cool.and.Heat,.and.
Program.mode..In.OFF.mode,.the.thermostat.will.not.turn.on.heating.or.cooling.devices..The.indoor.fan.can.
be.turned.on.in.all.operating.modes.using.the.fan.switch..In.the.Heat.mode,.the.thermostat.controls.the.
heating.system..Emergency.Heat.mode.can.be.utilized.if.a.heat.pump.malfunction.occurs..In.the.Cool.mode,.
the.thermostat.controls.the.cooling.system..In.the.Cool.and.Heat.mode,.the.thermostat.controls.both.the.
cooling.and.heating.systems..In.Program.mode,.the.thermostat.will.automatically.be.controlled.by.the.set.
program..Program.mode.can.function.with.Heat.mode,.Cool.mode,.Cool.and.Heat.mode.or.OFF.mode.(for.
Programmable.fan.option.only)..The.clock.display.alternates.with.the.set.temperature.display.for.Cool.and.
Heat.mode.
The.program.schedule.can.be.overridden.by.changing.the.set.temperature.( .or. )..This.puts.the.SC3801.
thermostat.into.a.2-hour.temporary.hold..After.2.hours,.it.will.automatically.return.to.the.program.schedule.
The.SC3801.also.has.a.button.lockout.feature..This.enables.the.thermostat.to.be.set.to.the.proper.mode.
and.temperature.and.locked.so.it.cannot.be.tampered.with.
Mode of Operation
