Aprilaire 8556 - Manual (Page 13)

Step 4: Repeat steps 2 and 3 for the Day “ ”, Evening “ ”, and Night “ ” events.
NOTE: If thermostat is set for 2 events per day, only the Day “ ” and Night “ ” events can be programmed.
Setting Or Changing Cooling Temperatures
NOTE: Cooling temperatures must be set at least 2 degrees higher
than heating temperatures. (Example: If heating temperature is set at
70˚F, cooling temperature must be set to at least 72˚F or higher.) If not
set at least 2 degrees higher, the thermostat will automatically lower
the previously programmed heating temperature to maintain the
2 degree separation.
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