Aprilaire 8555 Owner's Manual page 8

110-793B 7/11/01
NOTE: If not using Progressive Recovery, it will take some time for your heating or cooling system to reach the
desired temperature when returning from a setback. Therefore, it is suggested you set your program time before the
actual time you want your home to reach the desired temperature. For example, if you get up at 7:00 AM and have a
6 degree setback, set your Morning event at 6:00 AM to be sure the desired temperature is reached by 7:00 AM.
NOTE: This thermostat can be programmed with either 2 events per day (day and night) or 4 events per day (morning,
day, evening, and night). Before programming the thermostat, decide which setting is best for your personal schedule.
The thermostat is factory preset for 4 events per day. To change to two events per day, refer to page 20 "Optional
Settings for Additional Thermostat Features," or contact your contractor for assistance.
3:29 PM Page 8
To activate the progressive recovery
mode simultaneously press the
PROGRAM and FAN buttons. A small
thermostat icon, "
under the clock. Once in this mode
proceed with programming your
thermostat remembering to use exact
times for each event time change.
– 6 –
", will appear