Caution – Aprilaire 8553 User Manual
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To change the DIP switch settings, the thermostat must be
removed from the base which is attached to the wall.
The power to the thermostat must be turned off
before disassembling or the thermostat can be
permanently damaged. If you do not know
where the switch is that
controls the power to your
thermostat, do not attempt to
access the DIP switches. The
following procedure must be
carefully followed:
a) Turn off power to
the thermostat.
b) Completely open the
thermostat cover.
The cover will snap
into this position.
c) Carefully insert a medium-
sized flathead screwdriver
into the latch access slot
(see Figure 1).
Figure 1
CAUTION:
TO PREVENT DAMAGE, AVOID CONTACT
WITH BLUE TEMPERATURE SENSOR ON BOTTOM RIGHT-
HAND CORNER OF THERMOSTAT CIRCUIT BOARD.
110-790B 7/11/01 3:11 PM Page 25