AHU-1 SEQUENCE OF OPERATION - REV C
1. Supply fan runs whenever the zone group is occupied, or when any zone
   calls during unoccupied setback. Fan start is interlocked against the
   Level 2 fire alarm zone (see CON-SF-INTERLOCK).
2. Supply air temperature is reset by trim and respond between 12.8 and
   18.0 degrees Celsius, and is hard limited at 10.0 degrees Celsius low.
3. Economizer stages on outside air enthalpy, skipping 18 to 24 percent
   damper command. See knowledge note KN-AHU1-OAD.
