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Fan operation settings (TH3110D only)
Gas or Oil: For gas or oil heating
systems, leave the fan operation
switch in this factory-set position.
(This setting is for systems that
control the fan in a call for heat.)
Electric or Heat Pump: Change
the switch to this setting for heat
pump or electric heat systems. (This
setting is for systems that allow the
thermostat to control the fan in a call
for heat, if a fan wire is connected to
the G terminal.)
Thermostat mounting
1. Align the 4 tabs on the wallplate
with corresponding slots on the
back of the thermostat.
2. Push gently until the
thermostat snaps in place.
3. Push excess wire back into the
wall opening.
4. Plug wall opening with non-
flammable insulation.
Set fan operation switch.
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MCR29400A
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MCR29401A
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