Fan − Controlling Fan Operation; Displaying Outside Temperature; Settings − Filter And Maintenance Reminders - Lennox Merit 51M37 Operation Manual

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 ver-
sa), 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 15), the fan will run continuously regard-
less of whether the heating or cooling equipment is run-
ning.
Using Fan ON
i0:30
72
Figure 15
If auto fan mode is selected (AUTO displayed in FAN box −
see figure 16), the fan will only run when the heating or
cooling equipment is running.
Using Fan AUTO
i0:30
72
Figure 16

Displaying Outside Temperature

Pressing the ENTER (Outside) button at the HOME
screen displays the outside temperature (see figure 17) for
several seconds, then returns to room temperature.
Check Outside Temperature
88
Figure 17
505069M 07/05
Heat Cool
Prog Auto
Copy Day/Time
Fan Hold
Heat Cool
Prog Auto
Copy Day/Time
Fan Hold
Fan Hold
Settings Enter
(Outside)
Page 6
SETTINGS − Filter/Maintenance Reminders
The 51M42 thermostat is designed to remind you when the
filter needs changing or when routine maintenance is re-
quired, as (and if) defined, by you. These optional remind-
ers are not enabled until you activate them. To do so, press
the SETTINGS button (shown below the FAN button in fig-
ure 16) once or twice for the desired reminder as shown in
figure 18 and as described in table 1.
Reminder Settings Display
FILTER
MAINTENANCE
Figure 18
The default setting for the reminders is OFF (disabled).
Press Up/Down arrow buttons to select the desired re-
minder intervals.
Filter and Maintenance Reminders
Buttons to
Use Reminder
Settings FILTER
(1st press) (1st press)
then Arrows
to scroll to scroll
selections
Settings MAINTE-
(2nd press)
NANCE
then Arrows then Arrows
to scroll to scroll
selections
Enter
NOTE − The HOME screen will reappear about 15 seconds
after the final arrow button press. OR, press the ENTER
button at any time to store any changes and exit to the
HOME screen.
After either programmed interval has elapsed, the remind-
er will be displayed as shown in figure 19.
OFF
For FILTER, press SETTINGS
button 1 time
For MAINTENANCE, press
SETTINGS button 2 times
Table 1
Available Settings and
How to Use
Total fan run time expressed in
months (Off 1 3 6 12); for months (Off, 1, 3, 6, 12); for
example, if fan runs 12 hours a
day, 1 month reminder displays day 1 month reminder displays
in 2 calendar months.
Elapsed chronological time in
months (Off, 6, 12). Use this,
for example, to remind yourself for example to remind yourself
when to perform routine checks when to perform routine checks
or when to call a technician for
perodic preventive perodic preventive
maintenance.
Stores settings.