Honeywell RTH8500D Owner's Manual page 41

Set Fan Setting
Press the Fan button to select Auto or On:
Auto—Normal setting for most homes. The fan runs only
when the heating or cooling system is on.
On—The fan runs continuously. Use this setting for
improved air circulation or for more efficient air cleaning.
Set System Setting (Cont)
FAN
Inside
AUTO
SYSTEM
HEAT
SCHED HOLD
THU
Set To
AM
CLOCK SCREEN
41
Following
Schedule
M22262
69-1725-1