Title: 36 Siemens GDB181-MO.pdf.pdf
VAV ratio control, 20 % constant excess supply air volume flow (positive pressure in the room)Supply airExtract airVminVmaxVminVmaxSupervisory controller20 %80 %0 %60 %VAV Compact Controller0 %100 %0 %100 %Reference signal: Ysupply_air = 35 %, Yextract_air = Ysupply_air - 20 % = 15 %Result:Vsupply_air = 35 %, Vextract_air = 15 %minV&maxV&V&minV&maxV&V&V&supply_ airV&extract_ aiVAV ratio control, 20 % constant excess extract air volume flow (negative pressure in the room)Supply airExtract airVminVmaxVminVmaxSupervisory controller20 %80 %40 %100 %VAV Compact Controller0 %100 %0 %100 %Reference signal: Ysupply_air = 35 %, Yextract_air = Ysupply_air + 20 % = 55 %Result:Vsupply_air = 35 %, Vextract_air = 55 %minV&maxV&V&minV&maxV&V&V&extract_ aiV&supply_ air23 / 40VAV Compact Controller Modbus RTUA6V10631862_en--_d 2019-09-13Setting example B124 / 40Siemens Smart Infrastructure