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For Best Performance
The Aprilaire Model 8553 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.
2. Do not place anything which can give off warm or cool air, such as candles or portable
humidifiers, near the thermostat.
3. Although the thermostat is internally equipped to prevent short cycling of the furnace and air
conditioner, it is possible to inadvertently override this protection. Do not start, stop, and restart
the equipment without allowing a minimum of 2 minutes between heating or cooling cycles.
Thermostat Operation
The Model 8553 is a full-featured thermostat which allows for additional control and operations after
basic time and temperature programming is completed. In addition to the programming buttons used to
set up all event times and temperatures, additional buttons control the following functions:
110-790B 7/11/01 3:11 PM Page 16