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16. I live in an area where daylight savings
time is observed. How do I change the
thermostat clock twice a year without
affecting thermostat programming?
To change your clock, follow the instruc-
tions for setting current time and day. See
ENTERING YOUR PROGRAM. Thermo-
stat programming is not affected when you
change the clock.
17. Do I have to reprogram my thermostat
after I change the battery?
When the thermostat is on the wall and the
system has power, the thermostat is being
powered by a 24 VAC source. If power is
lost, or if the thermostat is removed from
the wall, the program will be retained for
approximately one minute if there is no
battery installed or if the installed battery is
dead. If you are changing the battery after
seeing a flashing BAT on the display, the
installed battery may be dead. If you re-
move the old battery and install a fresh one
within one minute, you should not lose
your thermostat programming. After in-
stalling a new battery, follow the proce-
dures in CHECK YOUR PROGRAMMING
to determine whether your programming
was maintained. If the thermostat main-
tains programming, press
SYSTEM
HEAT-OFF-COOL-AUTO
until OFF
is displayed, put the thermostat back on
the wall, press
SYSTEM
HEAT-OFF-COOL-AUTO
to select the oper-
ating mode you want, then press
RUN
PRGM
to
start program operation. If the program is
lost, reprogram the thermostat. See PRO-
GRAMMING YOUR THERMOSTAT.