The Two Position Damper option adds a binary output to control a two position minimum outdoor air damper.
The Proportional Damper option adds an analog output to control a proportional position minimum outdoor air damper. This damper ramps to fully open under normal conditions. However, if the optional Adjustable Minimum Position Outdoor Air Damper is selected, the damper opens to the Minimum OA Position as defined by the network input (MOADPOS-SP).