Simplex 4098-9685, Installation Instructions Manual

Page: 30 / 36

24
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 housing sampling tube holes should be checked periodically for
cleanliness, thus assuring easy air entry. Any dust or debris should be removed
from tube or tube holes.
The maintenance program of the particular detector/sensor used should be
carried out in accordance with the detector/sensor installation instructions.
Vacuuming the detector/sensor air entry areas should be performed annually, or
as required.
Installation,
Continued
Air Differential Pressure Test
Maintenance
Technical Manuals Online! - http://www.tech-man.com