Control Description The 508 is a
microprocessor-based
thermostat intended for one stage heating applications. The 508
allows for
one auxiliary sensor. The auxiliary sensor can be used to measure
air temperature
to get an average temperature for large areas. The auxiliary sensor
can be
used to measure slab temperature in order to limit the minimum and /
or maximum
allowed slab temperature. Or the auxiliary sensor can be used to
display the
outdoor temperature.