If you need a signal output that tells you whether the unit (Virex, Phoenix) is in filtration mode or not, there is no obvious signal available. But you can use the signal for the dosing pump in the feed line if this is not used otherwise for a chemical dosing pump for a chemical enhanced backwash. The signal for the dosing pump in the feed line is on only during filtration and off during cleaning, DIT and spare mode.
The singal is availbale from the connectivity kit pins X3: 5,6 and 7.
Florian, 15th February 2012