This module controls the Exhaust Air Damper (EAD), Outdoor Air Damper (OAD), and the Return Air Damper (RAD). The module is designed so that the EAD and OAD positions are the same, and the RAD position is complementary (the sum of the RAD and OAD positions is 100%). The module has functions for economizer control and low limit control of the dampers. It also has functions to ramp the damper to minimum position and maximum position.
The module also accepts commands for pressurize, depressurize, and purge. In the normal control modes, the damper control is modulated closed as the Low Limit Process Variable drops below the Low Limit Setpoint. This module also incorporates tracking the overridden value of the actual output objects. The module resets the PIDs to default tuning parameters if the Reset PID Tuning input is not Normal.