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Version 1 Oct 2009
Gas Filter Change LED (VOC monitoring)
Units equipped with a VOC sensor detect the level of Volatile Organic Compounds in
the exhausted air. If their presence exceeds a preset level the Alarm LED on the front
panel will illuminate. This indicates that the gas portion of the combined filter is
saturated and the filter needs replacing. See fig 10. The Maintenance section
describes the filter change procedure.
Fig 10
Closed Loop Auto Flow Control
With this fitted the unit features closed loop automatic flow control. This enables you
to set the required airflow rate. When filters start to block, the blowers in the extractor
will increase in speed compensating for any loss in performance. The extractor must
be fully installed, with all pipe work connected before setting the airflow.
Setting the Airflow
To set the airflow on your extractor, hold down the Up (+) and Down (-) arrows on the
front panel for 5 seconds. (See fig 8) The green LED will now start to flash, indicating
that the machine is now in set mode. You can now increase or decrease the flow by
holding down either the up or down arrow. The flow is indicated by a row of 6 blue
LED’s on the panel, 6 being full speed and 1 being the lowest. Set the airflow on the
lowest of the 6 LED’s but still ensure that all of the fume is being removed. This will
vary from application to application. Once you have set your speed, leave the
controls for 10-20 seconds and the machine will return to operation mode. (This
setup procedure should be carried out with all the ductwork connected and (if fitted)
the stop/start signal present)
