Lennox Ellite Series Owner's Manual page 20

Battery Replacement (Continued)
3 − Remove the old batteries and insert three fresh AAA
alkaline batteries, as marked on the thermostat.
4 − Align the terminal screw blocks with the pins on the
back of the thermostat.
5 − Push the thermostat straight onto the wallplate until it
snaps into place.
TERMINAL
SCREW
BLOCK
BACK OF THERMOSTAT
+
+
+
BATTERIES
(3)
WALLPLATE
Page 20
PINS ON
BACK OF
THERMOSTAT