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off even if the user has the fan selection set to continuous fan. The fan output
will be turned back on in this temperature range if the maximum capacity of
auxiliary heat is on due to system demand (auxiliary heat on in response to a
defrost signal shouldn’t cause the fan to turn back on).
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.