Siemens Industry, Inc.
Building Technologies Division
5
P/N A6V10330327_a_en
6)
Where possible, install duct detectors upstream of air
humidifiers and downstream of dehumidifiers.
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 FDBZ492-PR Housings come with an installation kit that
contains the following items:
• Short return (outlet) tube
• Input sampling tube stopper
• Two #12 x
3
/
4
” sheet metal screws
• Mounting template (packaged separately)
Remove mounting template. 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 FDBZ492-PR 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.
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for the specified duct width.
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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 the tube must be