Honeywell Programmable Thermostat Owner's Manual page 26

Then set the system switch.
Now, while you enjoy precision
temperature control, read on to
learn about the operating flexibility
that makes this thermostat THE
SMART CHOICE.
HEAT: The thermostat controls your
heating system.
OFF: Both the heating and cooling
systems are off.
COOL: The thermostat controls
your air conditioning system.
AUTO: The thermostat controls
either your heating or air condition-
ing system, depending on room
temperature.
You have finished programming
your thermostat.
If you removed it from the wall to
program, replace it following the
procedure on page 32.
HEAT OFF COOL AUTO
HEAT OFF COOL AUTO
HEAT OFF COOL AUTO
HEAT OFF COOL AUTO
22