Honeywell T8112D Programmable Thermostat User Guide

The T8112D Programmable Thermostat provides energy savings for single-stage heating and cooling applications while providing reliable, precise temperature control.

HEAT-OFF-COOL System switch. • AUTO-ON Fan switch. • Separate programs for weekdays and weekends (5 day/2 day). • Digital LCD display. • Easy to program and install. • Precise temperature control. • Four daily energy saving programs. • Compatible with most 24 Vac standing pilot, gas electronic ignition, oil or central electric systems. • Requires two AA alkaline batteries. • LCD flashes bAt Lo indicating low battery power. • Isolated heating/cooling circuits.

The thermostat fan operation switch, labeled FUEL SWITCH (see Fig. 9) is factory set in the F position. This is the correct setting for most systems. If you have an electric heat system, set the switch to E. In systems with the G terminal connected, the E setting turns on the fan immediately with heating or cooling.

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