The Waterside Economizer Suitability module provides four different options for determining when waterside economizer cooling is suitable. The module design is such that the control option it uses depends on what is connected to the inputs. If only the OAT is connected, it uses Dry Bulb. If the RH is connected and reliable, it uses Wet Bulb. If Building Load is connected, it uses one of the methods that includes plus Building Load.