Aprilaire Model 8570 - Manual (Page 8)

(2) OPEN THE THERMOSTAT
Use your hands to pull the thermostat face off of the base. Separate one side at a time. There are latches on
either side of the thermostat.
If needed, the thermostat can be pried from the base by inserting a flat-head screwdriver (see Figure 3).
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CAUTION
Loss of internal programs
may result from static
discharge to thermostat
circuit board. Avoid
touching the circuit board
and touch a grounded
metal object before
handling the thermostat.
INSERT SCREWDRIVER INTO 1 OF
4 SLOTS (2 ARE ON THE TOPSIDE,
2 ARE ON THE BOTTOM SIDE)
USE THE SCREWDRIVER TO SEPARATE THE
HOUSINGS. REPEAT ON THE REMAINING 3 SLOTS.
NOTE: THE HOUSINGS WILL NOT COMPLETELY
SEPARATE. PULL THE HOUSINGS APART WITH
YOUR HANDS TO COMPLETELY SEPARATE.
Figure 3