AFA4000/E VAV Airflow Controller / p.149
Figure 69: Connection diagram – Standard fume cupboard
A second pressure cell and Venturi damper can be used if the fume cupboard is very wide and
has 2 duct connections to the main duct header.
The AFA4000 controller will add the 2 volumes together to give a single total volume output.
3
rd
party restrictor devices or orifice plates can also be used with the pressure cell PCB.
The volumetric output is provided as an analogue 0-10 Vdc signal on Econ Output 2 and is also
available on the RS485 comms output.
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