CT50 Series • Owner's Manual
Set fan operation switch (CT51/CT55)
Move the switch to the proper setting for your
F: For gas or oil heating systems, leave the
fan operation switch in this factory-set position
(for systems that control the fan in a call for
E: 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.)
Set heat anticipator (select models)
Move the adjustment arrow to the
proper setting for your system
(see table below).
Hot water heat
Warm air (high efficiency)
Warm air (standard)
1. Align the slots on the cover with tabs on
the sides of the base, then push gently
until the cover snaps into place.
2. Restore power at the heating/cooling sys-
tem, or at the fuse/circuit-breaker panel.