TEL AFA4000/E - Page 148

AFA4000/E VAV Airflow Controller / p.148
Figure 68: Dual Output Calibration to give Reverse Output (opposite to Econ output 1 direction)
8.5.2 Volume pressure
The Volume Pressure function is used to provide a volumetric 0-10 Vdc output relative to the
fume cupboard extract volume. The controller power supply is fitted with a pressure cell PCB
and connects to a bell mouth venturi type restrictor in the duct. The restrictor can be provided
as a separate item or built into the Econ damper section.
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.
Max Output
Min Output
First Bleed Cal
Point e.g. 100%
Second Bleed Cal
Point e.g. 0%
First Bleed Cal
Sash Position
e.g. 500mm
Second Bleed Cal
Sash Position
e.g. 100mm
DUAL OUTPUT
ECON OUTPUT
0V
10V
10V
DUAL OUTPUT CALIBRATION