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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 a week. If power loss is long enough
for the program to be lost, the thermostat
will automatically return to the factory
programmed temperatures (64°F heating
and 82°F cooling) when power is restored.
You must reprogram the thermostat if this
happens.
If the word BATTERY 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 beep, which work
only on 24 VAC power.
Use
SYSTEM
HEAT - OFF - COOL - AUTO
to turn the thermostat OFF
before removing the thermostat from the
wall to replace the battery.
2. You may adjust the option switches for
keypad lockout (see OPERATING FEA-
TURES).
CAUTION
!