Aprilaire 8551 - Manual (Page 20)

– 18 –
Once the thermostat panel has been opened and removed from the base, turn the thermostat over
and locate the DIP switches found on the circuit board according to the following drawing:
Be careful to change only the intended DIP
switches per the explanation given at the
beginning of this section.
After the DIP switches have been set to the desired
position, carefully reassemble the thermostat.
a) Place the cover on the base by lining up the 2
round pegs on the bottom of the cover with the
half circle cutouts on
the top of the base.
Note that the
bottom of the
cover when fully
open slides in
behind the top
of the base. Swing
the cover fully open.
The cover will stay in place.
110-904 7/11/01 4:29 PM Page 20