Buttons, Backlight, Timers & Settings; Setting The Day And Time - Lennox ComfortSense 3000 Series Operation Manual

All display segments are momentarily activated. This
occurs as a normal part of thermostat initialization. Within
a few seconds, the Home Screen appears (see figure 2)
with default settings as shown. After about 1 minute of
initialization time, the actual room temperature will be
displayed.
Figure 2. Home Screen
At this point, the thermostat will be fully functional; its default
temperature setpoint (not shown) is 70°F. At this point, if the
equipment has been fully powered and if a heat demand
were present, the system would begin operating.
NOTE: Temperature scale default is Fahrenheit units but
may be reset to show Celsius, if desired. See page
7.
Buttons, Backlight, Timers & Settings
Buttons are located behind the small door on the right-hand
side of the thermostat (see figure 3).
IMPORTANT
Do NOT begin pressing buttons until after you read the
following section describing each button.
A pale blue display back-light illuminates for 30 seconds
each time any button is pressed.
When PROG or DAY/TIME is pressed, a field begins
flashing, expecting another input. Start making changes
within 15 seconds or the HOME screen will return.
Figure 3. Thermostat Buttons
When an Arrow, HOLD, HEAT, or COOL button is pressed,
SETPOINT and the temperature setting appears for 15
seconds. If desired, start making changes within 15 seconds
or the HOME screen will return. The back-light will turn off
15 seconds after the HOME screen reappears.

Setting the Day and Time

Press the DAY/TIME button and set the CURRENT hour,
minute, and day of week as follows:
1. "AM12" will flash on the screen. Press the UP/DOWN
arrows to change the hour. ("AM" or "PM" must
correspond to time of day.) Press DAY/TIME OR, if
adjusting for daylight savings time, pressing ENTER
stores the single change and exits to the HOME screen,
bypassing minutes and day of week.
2. Minutes will flash. Use the UP/DOWN arrow button to
display the minutes past the hour. Press DAY/TIME.
3. Day "MO" (Monday) will flash. Use UP or DOWN arrow
buttons to display the current day. Day selections are
abbreviated as "MO", "TU", "WE", "TH", "FR", "SA", and
"SU". Press DAY/TIME.
4. he HOME screen reappears; confirm day and time are
correct. This completes day and time setting.
2