Functionality and controllability: In addition to manual control, the F control module is only capable of external 1:1 digital control. It has an external STOP input that can be configured to either NO or NC and the F control module has two outputs (contact closures only), one that outputs pulses in synch with the pump stroke and one which correlates with the STOP input.
The Y control module can run via manual control as well as various external control methods (programmable or fixed analog input or digital input with Multiply or Divide features) It also has a STOP input, but it is not selectable NO/NC. The Y module also has two relay outputs and can be configured in a variety of configurations. Additionally, the PosiFlow sensor can be connected directly to the Y control module and it can be programmed to stop the pump and output an alarm if no flow is detected. The Y control module has several other features that are programmable including a calibration and output view in volume (GPH).