Aprilaire 8552 User Manual
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No. 2 – Keypad Lock. If tampering with the thermostat is expected and unwanted, the keypad can be
locked by moving this switch from the factory set OFF position to ON. This should not be done until
all programming is finalized. In the locked position only the following functions can be done:
•
The outdoor temperature button will display the outdoor temperature.
•
The DECREASE
button or INCREASE button will temporarily change the set
point a maximum of plus or minus 3 degrees for a period of 1 hour, before the thermostat
automatically returns to the original program.
If the thermostat does not respond when a button is pushed it may be because the keypad has
been locked. A Lock icon “ “ will appear when a button other than OUTDOOR is pushed if the
keypad has been locked.
No. 3 – Fan with Heat Call. This switch was set by the installing contractor to operate the thermostat
properly with your equipment. DO NOT change the position of this switch without consulting with
the installing contractor.
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