AFA4000/E VAV Airflow Controller / p.21
3.6.2.2 Econ output 1
0 - 10 Vdc / 2 – 10 Vdc control output, configurable for direct or indirect action.
3.6.2.3 Econ output 2
0 - 10 Vdc / 2 – 10 Vdc output, configurable as:
• volumetric 0 – 10 Vdc output (when using sash position or volumetric measuring sensors)
• a second control output, configurable for direct or indirect action, or
• a face velocity retransmission output.
3.6.3 Airflow sensor
An RJ12 connection socket is provided for the face velocity airflow sensor.
3.6.4 Communications
3.6.4.1 Comm port
RS485 enables connection to a laptop or PC for full diagnostics, logging, configuration and for
communications to building management or automation systems (BMS/BAS).
For specific information on Modbus RTU options and settings, see section 8.1.1.3.
For specific information on BACnet options and settings, see section 8.1.1.4.
3.6.5 Power supply
Low voltage DC power supply from the mains power adaptor or from the Econ power supply
(damper control type).
3.6.6 Optional inputs
3.6.6.1 Temperature sensor
Bespoke temperature sensor for connecting into inputs 1, 2 or 3 to give temperature display
with high or low temperature alarms.
3.6.6.2 Volume pressure sensor
An auxiliary pressure cell PCB fits into the Econ power supply relay interface unit and is
dedicated to input 2. This is used for measuring volume on an orifice restriction, or bell-mouth
venturi type restrictor.
3.6.6.3 PIR occupancy sensor
Auxiliary PIR used for close sash alarm based on the fume cupboard occupancy.
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