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Reviewing Programmed Time Schedules
And Temperature Settings
Press and release the PROGRAM button repeatedly to advance to “Mo Tu We Th Fr”, or “Sa Su” and
specific event. Continue pressing the PROGRAM button to review the time schedules and temperature
settings for each desired event.
To Start Running The Program
After all temperatures and start times have been programmed, press and release the RESUME
button to start running programs. If no button is pressed, the thermostat will resume automatically in
approximately 15 seconds.
For Best Performance
The Aprilaire Model 8551 thermostat is designed for accurate temperature control and easy
operation. The following guidelines should be followed to ensure proper operation of the thermostat:
1. When the thermostat is operating, close the cover to allow for proper air circulation over the
temperature sensor.
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