Title: 36 Siemens GDB181-MO.pdf.pdf
6.3.3 Min/max control by the VAV Compact ControllerWhen setting the minimum / maximum air volume flow in the VAV Compact Controller, the supervisory controller must be set to Vmin= 0% und Vmax = 100 %. With this setting, the supervisory controller reference signal for both the supply air and extract air controller is the same. Thus, supply air / extract air control with a single reference signal is possible.VAV ratio control 1 : 1Supply airExtract airVminVmaxVminVmaxSupervisory controller0 %100 %0 %100 %VAV Compact Controller20 %80 %20 %80 %Reference signal: Ysupply_air = Yextract_air = 25 %Result:Vsupply_air = Vextract_air = 35 %minV&maxV&V&minV&maxV&V&V&supply_ airV&extract_ aiVAV Compact Controller Modbus RTUA6V10631862_en--_d 2019-09-13Setting example B2Setting example B3Siemens Smart InfrastructureVAV ratio control, 20 % constant excess supply air volume flow (positive pressure in the room)Supply airExtract airVminVmax