Honeywell RTH6400 - Manual (Page 17)

RTH6400 Programmable Thermostat
69-22ES—0
If the cool temperature is lowered to where it gets close to the heat setting, an arrow
next to heat will show the thermostat is lowering the heat setting down to maintain a
3-degree separation.
Auto Changeover
CAUTION: To avoid possible compressor damage, do not use Auto
Changeover if the outside temperature drops below 50ºF (10ºC).
Run Schedule
Auto
Cool
Fan Select
Heat/Cool
Heat
Setting
Inside
PM
73
73
1:05
Temporary
M27477
Press Select Heat/Cool to set the heat or cool
temperature.
The triangle indicates the cool temperature is
increasing to maintain 3 degrees between heat
and cool settings.