VDOT-ASD-400 Aspiration Detector
Velocity Detection
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VDOT-ASD-400 Aspirating Smoke Detector User’s Manual V1
Commissioning
Before commissioning the detector, the local standards of aspirating detection systems must be
consulted. These standards differ widely throughout the world and specific advice for the market in
one country may not be applicable to another.
Commissioning strategy will initially depend upon the environment in which the detector is
installed. For instance, the test for a computer room (which should be a relatively clean
environment) would be very different from, say, a tobacco factory, which would probably have a
high level of airborne particulate content.
A widely accepted standard for computer rooms/IDC areas is British Standard BS6266 and also the
NFPA 76, equipment overheating at a stage well before combustion. To perform the test electrically
overload a 1-meter length of PVC insulated wire of 10/0.1mm gauge for one minute using an
appropriate power supply. The detector has two minutes from the end of the wire burn to give an
alarm indication.
For areas with higher levels of background particulate matter testing methodology would be similar
to that of standard point detectors.
Commissioning Check List
The following brief checklist allows quick setup of the detector. This procedure will be adequate for
most standard installations.
o
Before powering up the detector, visually check all cabling to ensure correct connection. If wire
identification is not immediately clear (e.g. by use of different colored wires or wire
identification sleeves) an electrical check should be made. Any damage caused by
misconnection of the detector is not covered by warranty.
o
Power up the unit and enter the engineering access code.
o
Enter the Setup menu and verify that the time and date are correct.
o
Set the appropriate alarm levels and time delays for the protected environment.
o
Modify necessary settings in your application and exit program mode.
o
Introduce smoke to every pipe end to make sure the maximum transport time is within
specification. Typical maximum transport time per NFPA 72 is 120 seconds. Other transport
time requirement should be specified considered in the design stage.
o
Perform any necessary smoke tests, like Hot Wire performance test or Potassium Chlorate /
Lactose performance test, ensuring that the detector reacts appropriately, and let the smoke
fully dissipate.
Note:
