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505069M 07/05
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
Figure 15
Heat
Prog
Fan
Cool
Day/Time
Hold
Auto
Copy
i0:30
72
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
Figure 16
Heat
Prog
Fan
Cool
Day/Time
Hold
Auto
Copy
i0:30
72
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
Figure 17
88
Fan
Settings
Hold
Enter
(Outside)
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
Figure 18
FILTER
OFF
MAINTENANCE
For FILTER, press SETTINGS
button 1 time
For MAINTENANCE, press
SETTINGS button 2 times
The default setting for the reminders is OFF (disabled).
Press Up/Down arrow buttons to select the desired re-
minder intervals.
Table 1
Filter and Maintenance Reminders
Buttons to
Use
Reminder
Available Settings and
How to Use
Settings
(1st press)
FILTER
Total fan run time expressed in
months (Off13612); for
(1
s
t
press
)
then Arrows
to scroll
mon
th
s
(Off
,
1
,
3
,
6
,
12)
;
f
or
example, if fan runs 12 hours a
day 1 month reminder displays
to scroll
selections
day, 1 month reminder displays
in 2 calendar months.
Settings
(2nd press)
then Arrows
MAINTE-
NANCE
Elapsed chronological time in
months (Off, 6, 12). Use this,
for example to remind yourself
then Arrows
to scroll
for example, to remind yourself
when to perform routine checks
to
scroll
selections
when
to
perform
routine
checks
or when to call a technician for
perodic preventive
pero
di
c preven
ti
ve
maintenance.
Enter Stores settings.
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.