CT50 Series • Owner's Manual
Set fan operation switch (CT51/CT55)
Move the switch to the proper setting for your
system:
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
heat).
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).
Your system
Steam
Hot water heat
Warm air (high efficiency)
Warm air (standard)
Electric heat
Finish installation
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.
69-2040EFS—01
Setting
1.2
0.8
0.8
0.4
0.3
Tab
4
M23
M23795
M23796