Siemens Industry, Inc.
Building Technologies Division
5
P/N 315-049708-5
7) To prevent false alarms, the duct detector should not be
mounted in areas of extreme high or low temperatures,
in areas where high humidity exists, or in areas where
the duct may contain gases or excessive dust.
Duct Preparation
The AD2 Series Housings come with an installation kit that
contains the following items:
• Short return (outlet) sampling tube
• Stopper
• Two #12 x
3
/
4
” sheet metal screws
• Mounting template (packaged separately)
Remove mounting template from the installation kit. Remove
paper backing from the mounting template and affix it to the
duct at the desired location. Using the template as a guide,
drill (2) mounting holes, 3/32" (2.5mm) for the #12 X
3
/
4
”
sheet metal screws packaged in the installation kit. Drill or
punch (2) 1¼” (32mm) holes for input sampling and outlet
tubes, using the template as a guide. Clean all holes.
Sampling Tube Installation
The AD2 Series duct smoke detectors use a specially
notched sampling tube, which may be ordered separately in
one of four standard lengths.
ST-10
For duct widths of 6" to 1.0’
ST-25
For duct widths of 1.0’ to 3.0’
ST-50
For duct widths of 3.0’ to 5.0’ (requires support)
ST-100*
For duct widths of 5.0’ to 10.0’ (requires support)
*
This model is supplied as two 5 ft. sections with a coupling.
Assembly is required for installation.
Each model is manufactured with a different number and
size of sampling holes. Only the specific tube must be used
for the specified duct width.
Standard sampling tubes are steel tubes with air intake holes
drilled the entire length of the tube. These tubes can be cut
to length and must span at least 80% the width of the duct.
Sampling tubes over 3.0’ must be supported on the opposite
side of the duct. To ensure the correct operation, the red
stopper (stopper in installation kit) must be inserted in the
end of the air input sampling tube. If the input tube protrudes
through the opposite side of the duct, the opening around
