Stulz C7000 - Calculation of the Air Volume Flow

149 © STULZ GmbH – all rights reserved EN/06.2019/G57
C7000 INSTRUCTIONS fOR A/C UNITS
6.12 Calculation of the Air Volume Flow
Config
.../Values/Air
Info
.../Values/Air
To calculate and display the air volume flow the A/C unit must be
equipped with a nozzle and a differential pressure sensor.
The differential pressure sensor must be configured with the sensor
purpose "35 - Diff.press. airflow“.
The airflow is calculated using the differential pressure and the k val-
ue, a specific nozzle value which is delivered by the manufacturer.
The k value range is 0..65535, with the preadjusted 0, by which the
calculation is disabled (nozzle not existent). The actual value is out-
put at the IOC by the commands "avf“ and "is 3“.
The k value can be adjusted in menu Config/Values/Air or by the
command:
avf nozzle 380
The airflow is displayed
- at the C7000IOC by "is 1“
- at the C7000AT under "Info/Values/Air“ (only, if k > 0)
The calculated air volume flow can be output by an analog output.
See menu Config/components/aux. ports/AOUT.
The sensor purpose which must be chosen is "air volume flow" (com-
mand: valout # use 37).