69-1849 - PRO 4110D Programmable Thermostat - Honeywell

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Installation GuideFan operation settings• Gas or Oil: For gas or oil heatingsystems, leave the fan operationswitch in this factory-set position(This setting is for systems thatcontrol the fan in a call for heat.)• Electric or Heat Pump: Change theswitch to this setting for heatpump or electric heat systems.(This setting is for systems thatallow the thermostat to control thefan in a call for heat, if a fan wire isconnected to the Gterminal.)Set fan operation switch6
PRO TH4110D Programmable ThermostatPower options & mountingConnect commonside of transformerto “C” terminalAC PowerThe thermostat can be powered by 24VAC power, or by batteries.To wire the thermostat for AC power,connect the common side of thecooling transformer to the “C” terminalas shown at left.Important: Remove R/Rc jumper for2-transformer systems only. (See wiringdiagram on page 5.)Battery PowerThe thermostat can be powered bybatteries alone or, if used with ACpower, can provide backup power.During power interruptions thebatteries will save time/day settingsand power the display.Install batteries in back of thermostat(optional if AC powered).To Mount ThermostatAlign the 4 tabs on the wallplate withcorresponding slots on the back of thethermostat, then push gently until thethermostat snaps in place.7
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69-1849 - PRO 4110D Programmable Thermostat - Honeywell

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