50
The outside air dampers close when the unit is off. If the unit operates in the unoccupied
mode, the economizer operates as described in the occupied mode except that the
outside air damper minimum position is 0% open.
Two-position outside air dampers (optional) -
Used in place of Economizer when no outside air temperature sensor is present.
The outside air dampers open fully when:
•
The fan is running, and
•
The room is occupied.
The Room Controller closes the dampers completely when:
•
The fan is not running, or
•
The room is unoccupied, or
•
The freezestat is on.
The discharge temperature limit control (if present) limits the damper position if the
discharge temperature drops too low.
