Bryant Preferredt Series Installation Instructions Manual page 40

If the outdoor air temperature is below 12_F/- 11_C and there is sufficient demand
for the equipment to be on, then the fan output is turned back on and the W/W1
output is energized. In a two speed unit the Y/Y2 output should be energized in
addition to the W/W1 output.
NOTE: All temperature boundaries have a +/- 2_ hysteresis.
Factory default is OF (Off).
Option 99 — Reset to Factory Defaults
Use this capability to reset the stat to "out of the box" conditions. BEWARE! All
configuration settings, program settings, clock, and calendar which have been
manually entered will be lost!
When this option is selected, the configuration number (99), will appear on the left
and 10 will appear on the right. To perform the reset, first use the MODE key to
move the box from the 99 to the 10 (programmable model) or to flash the 10
(non- programmable model). Then press and hold the DOWN key. The 10 will start
counting down toward zero. If the DOWN key is kept pressed until the count
reaches zero, the reset will be performed. When the value reaches zero, the heat
setpoint shall display - - . The cool setpoint shall display - and the room air
temperature shall display Fd. When the factory defaults have been restored, the
thermostat will act as if power was cycled and return to normal operation. If the
DOWN key is released early, the number will return to 10 and the reset will not
occur.
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