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6
PARTS OF THE THERMOSTAT
The Back of The Thermostat Body
Turn the thermostat body over. On the back are
the 9 volt Energizer
®
alkaline battery and the
option switches.
1. The 9 volt Energizer
®
alkaline battery pro-
vides power to the thermostat when the
24vAC power is interrupted (for example,
when you remove the thermostat from the
wall for programming). A fresh battery will
maintain the stored program for approxi-
mately a week. If power loss is long enough
for the program to be lost, the thermostat will
automatically return to the factory pro-
grammed temperatures (64°F heating and
82°F cooling) when power is restored. You
BACK OF THERMOSTAT BODY
Option switches 9-pin connector
4-pin connector
Battery
W18
must reprogram the thermostat if this hap-
pens.
If the word BATTERY is flashing in the
display window, the battery is low and should
be replaced with a fresh 9 volt Energizer®