Mixed system with ER + 4 RV 2 (unmixed)

Fig. Schematic representation

Unit control ER	Own 230 VAC power supply/internal control. ER volumetric flow compensation via 230 V input (switching contact) of the RLS 45 K.
Unit control RV 2	RS 485 interface, 13.8 VDC.
S1	On/off switch