The operation manual for the OAC outdoor air controllers is based on GreenTrol Automation’s 3000, 3000S, 4000, and 5000 hardware architecture. The OAC-3000 and OAC-3000S have a physical binary input (BI1). The OAC-4000 and OAC-5000 use a general-purpose input factory configured as a binary input (GP1 configured as BI1). The binary input is used to trigger occupied outdoor airflow control. The OAC-3000 and OAC-3000S modulate MP-Bus actuators provided by GreenTrol. The OAC-4000 and OAC-5000 modulate proportional analog actuators or fan speed controllers having an analog input for speed control.