CT87N/CT87K • Owner's Manual
69-1959EFS—02 4
1. Align the slots on the base with tabs on
the thermostat, then push gently until the
thermostat snaps into place.
2. Restore electrical power at the heating/
cooling system, or at the fuse/circuit-
breaker panel.
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
(forsystemsthatcontrolthefaninacallfor
heat).
E: Change the switch to this setting for heat
pump or electric heatsystems.(Thissetting
is for systems that allow the thermostat to
control the fan in a call for heat, if a fan wire is
connected to the Gterminal.)
Set fan operation switch (CT87N)
Finish installation
Base
Heating System Switch 1 Switch 2
Steam or gravity On On
High efficiency warm air Off On
(90%plusefficiency),
hot water, or heat pump
Gas or oil warm air Off Off
(factorysetting)
Electric warm air On Off
Thermostat
Coverplate
(optional)
Move the cycle rate switches
to the proper setting for your
system(seetablebelow).
Set cycle rate switches
