Aprilaire 8553 - Manual (Page 27)

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.
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110-790B 7/11/01 3:11 PM Page 27