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15. 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 the clock, follow the instructions
for setting current time and day (see EN-
TERING YOUR PROGRAM). Thermostat
programming is not affected when you
change the clock.
16. 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 ap-
proximately one minute if there is no bat-
tery 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 installing a
new battery, follow the procedures in
CHECK YOUR PROGRAMMING to deter-
mine whether your programming was main-
tained.