9
Version 10.08.2011
Optional Extra Feature Considerations
The below features are optional extras that will only be fitted if
requested at the time of ordering the unit.
5. If fitted, the following features need to be considered when installing the unit:
Important
If the AD unit has an exhaust air outlet spigot fitted, the exhausted air can be routed
outside of the building if required. It is important to keep any ducting used to do so to
a minimum, in order to reduce back pressure within the system.
Filter blocked/System failure signal.
With this option the extraction unit will have
been fitted with a pressure transducer to monitor the condition of the filters and to
indicate the extractor is running. In addition to controlling the LED’s on the front of the
unit, this signal is available via the green and white cores of the control cable that
exits the cabinet next to the power cable. The signal is a “volt free” contact, i.e. a
closed circuit will exist between the green and white wires when the filter condition is
good and the unit is running. This will change to an open circuit on filter blockage or
system failure. This feature should only be used on control voltage circuits. The
signal can be connected to the laser or alternatively to operate a beacon, siren or
warning device. Open circuit condition of this circuit will not directly stop the extractor
motor.
Remote stop/start.
If this facility is installed it enables the extractor unit to be turned
on and off by a signal from the laser.
The red and black cores of the control cable
need to be connected to a 5-24v dc supply, which when applied will start the unit and
when switched off will stop the unit. However the mains power switch must be in the
“on” position for the signal to be effective.
Fig 6
5-24V
Remote Stop/ Start Over-Ride
If fitted, remote operation can be overridden by using the override switch, which is
mounted inside the unit (see
fig. 7).
Fig 7
