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Displaying Outside Temperature
Pressing the ENTER (Outside) button at the HOME
screen displays the outside temperature (see figure 15) for
several seconds, then returns to room temperature.
88
Figure 15. Check Outside Temperature
SETTINGS − Filter/Maintenance Reminders
The L3722C 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 re-
minders are not enabled until you activate them. To do so,
press the SETTINGS button once or twice for the desired
reminder as shown in figure 16 and as described in table 1.
FILTER
MAINTENANCE
Figure 16. Reminder Settings Display
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
Reminder
Use
Settings
FILTER
(1st press)
(1st press)
then Arrows
to scroll
to scroll
selections
Settings
MAINTE-
(2nd press)
NANCE
then Arrows
then Arrows
to scroll
selections
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 17.
506071−01 02/08
Fan
Hold
Settings
Enter
(Outside)
OFF
For FILTER, press SETTINGS
button 1 time
For MAINTENANCE, press
SETTINGS button 2 times
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 in 2
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
example, to remind yourself when to
perform routine checks or when to
call a technician for perodic
call a technician for perodic
preventive maintenance.
Stores settings.
MO
PROG
AM
A B C D
PM
HOLD
FAN
ON
AUTO
FILTER SERVICE
MAINTENANCE
ROOM
76
FAN
ON
AUTO
FILTER SERVICE
MAINTENANCE
ROOM
76
Figure 17. Reminders
After the filter has been changed or maintenance per-
formed, reset the reminder by pressing the SETTINGS
button for 4 seconds at the corresponding reminder set-
tings screen. The screen will blink for a few moments to in-
dicate that the timer has been reset.
Service Indicator
When abnormal equipment operation is detected, the
SERVICE indicator will flash on the screen (see figure 17).
This indicates that the equipment requires service from a
qualified service technician.
Thermostat RESET
Under some abnormal conditions, it may be necessary to
reset" the thermostat to its default condition. Such a RE-
SET would delete all programming and settings and there-
fore should only be used on rare occasions when the the
thermostat fails to function as designed and/or as pro-
grammed. Such an instance can occur as a result of a pow-
er surge or similar electrical disturbance (e.g. after an elec-
trical storm or power outage). The RESET button can be
used to recover from this situation.
When the RESET button is pressed, ALL settings re-
vert back to the defaults, including the default pro-
gram (see tables 3 and 4).
The RESET button is an unlabeled, recessed button lo-
cated behind the door on the right−hand side of the thermo-
stat, below the SETTINGS button (see figure 3). Use a pa-
per clip or small pencil to press the RESET button; ALL
thermostat settings will be reset to the defaults listed in the
Default Thermostat Settings section.
Page 6
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Filter &
COOL
Maintenance
OFF
Indicators
AUTO
EMG.
°
HEAT
Service
COOL
OFF
Indicator
AUTO
Flashing
EMG.
°
HEAT
CAUTION
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