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l
Review and write down the program contained
in the.thermostat. Use th#? form on the preViOUS
page.
NOTE: Save the program information. The battery
replacement procedure results in the loss of the
thermostat program.
. Loosen Allen screw at each corner alo”; the
bottom of thermostat.
l
Remove thermostat by winging bottom away
and upward from wallplate or subbase
(see Fig. 4).
l
If bottew replacement is required,
replace
only
with o f&h’Mailo~ MNlM)4’or equiv&nt C?-v61t
alkaline battery. Place battery in the clip on the
wallplate or subbase. Fold the battery wire!;
against the wallplate (subbase).
It is not necessary to disconnect power supply to the
system during battery replacement. This would cause
backup battery operation and battery drain until the
system is powered up.
. Reattach T7400 to wallplate. and secure by
tightening both Allen screws along bottom of
thermostat. Do not overtighten.
l
Reprogram the 77400 thermostat using the
program written down earlier.
Fig. 4-Install backup battery
20


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