You can reset the variable speed primary chilled water pump dP setpoint based on one of two methods, reset by building dP or reset by coil position. When reset is based on building dP, the pump dP setpoint incrementally increases (stage up) if the building dP is below the building dP setpoint minus deadband (default = 2 psi), and incrementally decreases (stage down) if the building dP is above that setpoint plus deadband. When reset is based on chilled water coil valve position, a number of valve positions (default of four) are monitored and a statistical algorithm is applied to determine if the pump dP setpoint is incrementally increased (stage up), decreased (stage down), or held at its present value.