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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
24 VAC 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 one week. If power loss is long
enough for the program to be lost, the
thermostat will automatically maintain a
factory preprogrammed heating tempera-
ture of 64°F and a cooling temperature of
82°F after power is restored. You must
reprogram the thermostat if this happens.
If the word BAT is flashing in the display
window, the battery is low and should be
replaced with a fresh 9 volt Energizer
®
alkaline battery. The battery will provide
power for all functions except the display
light and audio prompting, which work only
on 24 VAC power. If the word BAT is
displayed continuously (non-flashing), the
thermostat is not being supplied with
24 VAC power and is being powered by
the battery alone.