Title: 36 Siemens GDB181-MO.pdf.pdf
10.2 Parameter and function description 10.2.1 Vnom (nominal volume flow) [m3/h or l/s]à Register 385 VAV boxes are ordered through an OEM according to the required nominal volume flow (Vnom) and min. / max. volume flow settings (Vmin / Vmax). The maximum volume flow for ventilating a room / zone can’t be higher than the nominal volume flow.10.2.2 Vmin / Vmax (minimum / maximum volume flow) [%]à Registers 386/387 These values limit the nominal volume flow by multiplying with Vnom. Their effect is described in chapter 6.10.2.3 Elevation above sea level [m]à Register 388 This value enhances the accuracy of the differential pressure sensor to compensate for the air density decreasing with increasing altitude. It can be set in 500m steps, so for a given building the setting closest to the actual altitude is to be used.Example: Altitude of building: 420m a.s.l. à use setting “500m”10.2.4 Override control