Caution – Aprilaire 8551 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.
110-904 7/11/01 4:29 PM Page 18