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15. I live in an area where daylight savings
time is observed. How do I change my
thermostat clock twice a year without
affecting 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.
16. Do I have to reprogram my thermostat
after changing 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 ap-
proximately 5 seconds 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 remove and
replace the battery with a fresh one quickly,
you may not lose your programming. After
installing the new battery, follow the proce-
dures in CHECK YOUR PROGRAMMING
to determine whether your programming
was maintained. If the thermostat maintains
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 operating
mode you want, then press
RUN
PRGM
to start
program operation. If programming is lost,
you must reprogram the thermostat. See
PROGRAMMING YOUR THERMOSTAT.