White Rodgers 1F90W-51 - Manual (Page 31)

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13. 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.
14. Do I have to reprogram my thermostat
after I change the batteries?
When the thermostat is on the wall and the
system has power, the thermostat is being
powered by a 24v AC 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 are no
batteries installed or if the installed batteries
are dead. If you are changing the batteries
after seeing a flashing BATTERY on the
display, the installed batteries may be dead.
If you remove the old batteries and install
fresh ones within one minute, you should
not lose your thermostat programming. Af-
ter installing new batteries, 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
until OFF
is displayed, put the thermostat back on the
wall, press SYSTEM
HEAT-OFF-COOL
to select the operating
mode you want, then press RUN
PRGM
to start
program operation. If the program is lost,
reprogram the thermostat. See PROGRAM-
MING YOUR THERMOSTAT.