Fan - Controlling The Fan Operation; Settings - Filter/Maintenance Reminders - Lennox ComfortSense 3000 Series Operation Manual

3. Use the Up/Down arrow buttons to select the desired
minute; press PROG.
4. Use the Up/Down arrow buttons to select the desired
temperature setpoint; press PROG.
5. Repeat steps 2 through 4 for periods B, C, and D.
6. Repeat steps 1 through 5 for the 2-day program.
NOTE: This thermostat will NOT automatically switch
from heating to cooling, or vice versa; operator
involvement is required. At the change of seasons,
or to accommodate abnormal seasonal temperature
swings, you must manually select to the opposite
conditioning (Heat or Cool) program.

FAN - Controlling the Fan Operation

Use the FAN button to select either continuous fan mode or
auto fan mode.
To change from continuous to auto fan mode (or vice versa),
press the FAN button. Note whether a fan icon in the FAN
box is present (indicating that the fan is running) or not (fan
not running).
If continuous fan mode is enabled (ON displayed in FAN
box - see figure 13), the fan will run continuously regardless
of whether the heating or cooling equipment is running.
Figure 13. Using Fan ON
If auto fan mode is selected (AUTO displayed in FAN box
- see figure 14), the fan will only run when the heating or
cooling equipment is running.
Figure 14. Using Fan AUTO

SETTINGS - Filter/Maintenance Reminders

The L3511C thermostat is designed to remind you when
the filter needs changing or when routine maintenance
is required, as (and if) defined, by you. These optional
reminders are not enabled until you activate them. To do so,
press the Settings button (shown below the Fan button in
figure 14) once or twice for the desired reminder as shown
in figure 15 and as described in table 1.
Figure 15. Reminder Settings Display
The default setting for the reminders is OFF (disabled).
Press Up/Down arrow buttons to select the desired reminder
intervals.
Table 1. Filter and Maintenance Reminders
Buttons to
Use
Settings
(1st press)
then Arrows
to scroll
selections
Settings
(2nd press)
then Arrows
to scroll
selections
Enter
NOTE: The HOME screen will reappear about 15 seconds
after the final arrow button press. OR, press ENTER
at any time to store any changes and exit to the
HOME screen.
After either programmed interval has elapsed, the reminder
will be displayed as shown in figure 16.
Figure 16. Reminders
After the filter has been changed, reset the filter reminder by
pressing the SETTINGS button for 4 seconds. The screen
will blink for a few moments to indicate that the timer has
been reset.
5
Available Settings
and
Reminder
How to Use
Total fan run time
expressed in months
(Off, 1, 3, 6, 12);
for example, if fan
FILTER
runs 12 hours a day,
1 month reminder
displays in 2 calendar
months
Elapsed chronological
time in months (Off,
6, 12). Use this, for
example, to remind
yourself when to
MAINT
perform routine
checks or when to
call a technician for
periodic preventive
maintenance.
Stores settings.