VDOT-ASD-400 Aspiration Detector
Velocity Detection
34
VDOT-ASD-400 Aspirating Smoke Detector User’s Manual V1
Maintenance
VDOT-ASD-400 aspirating smoke detector is a very low maintenance detection system. If required,
external cleaning of the unit should be performed using a damp (not wet) cloth. Do not use solvents
as these may mar the display bezel. The only part that may require field replacement during
servicing is the dust filter. The filter condition can be checked from the Display, which gives a
percentage reading of filter efficiency and the filter expired due date. When the level drops to 70%
or the date is due the detector will signal a Filter renew fault and the filter will need replacing.
The following illustration shows how the dust separator is replaced.
Open the front cover using the key provided, and locate the filter at the bottom of the detector as
shown. Untighten the screw in the middle of the filter to remove the filter. Fit a new filter, make
sure to push the filter fully home and tighten the screw.
When the replacement filter is fitted, enter the setup menu to set a new filter. When new filter is
set, a filter flow calibration process will be initiated to learn the flow rate passing through the new
filter. The filter due date will also be set to two years from the date changing the new filter.
Preventive Maintenance
To guarantee the best performance of VDOT-ASD-400 aspirating detection system, a periodic
preventive maintenance is required. The PM schedule is as follows:
Time
Content
Monthly Quarterly
Every 6
months
Every
year
Every two
years
Power Supply Check
V
V
V
V
V
Display Check
V
V
V
V
V
Air Flow Check
V
V
V
V
V
End Cap Test
V
V
V
V
Sampling pipes inspection
V
V
V
Signaling inspection
V
V
Clean sampling pipework
V
There are monthly inspection, quarterly inspection, 6 months inspection, yearly inspection and two
years inspection schedules for the VDOT-ASD-400 aspirating smoke detection systems. It is
recommended that monthly inspection is done by the user and all the others are performed by the
trained professional personnel or companies.
It should be checked that there have been no unauthorized changes to the system configuration
(e.g. Sensitivity). If changes are required or have taken place, then these must be documented.
