Simplex 4098-9687, Installation Instructions Manual

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17
With the air handling unit turned on and all filters and dampers in place, measure
the air differential pressure using a Dwyer Instrument Co. (Michigan City, Ind.)
No. 20026 0 to 2” H
2
O (or equivalent) differential pressure gauge.
Take measurements from inside of the detector/sensor housing before the cover is
installed. Measure the difference in pressure between the intake tube and the
exhaust tube. The pressure differential for all duct velocities between 300 and 4000
feet per minute (91 to 1220 M/min.) shall not be less than 0.015 inches (.381 mm)
of water nor greater than 1.55 inches (39.370 mm) of water.
After testing is completed, secure the clear plastic cover to the housing using the four
screws
(Torque screws to 8-10 inch-pounds).
The duct detector sampling tube holes should be checked periodically for
cleanliness, thus assuring easy air entry. Any dust or debris should be removed
from the tubes or tube holes.
The maintenance program of the particular detector used should be carried out in
accordance with the detector installation instructions. Vacuuming the detector
air entry areas should be performed annually, or as required.
Installation,
Continued
Air Differential Pressure Test
Maintenance
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