P/N 315-049708-5
Siemens Industry, Inc.
Building Technologies Division
6
the tube must be sealed. For custom duct widths, always
use the next longest standard size and cut down to the exact
requirement.
Once the airflow direction has been determined (refer to
Figure 3), insert the input and outlet tubes into the duct
housing.
1.
Remove the cover from the housing.
2. Loosen the screw and rotate the tube retainer until the
input tube is inserted and oriented properly. Ensure that
the notched end of the tube is inside the housing and
that the air input sampling tube is positioned so that the
input holes are directly facing the airflow.
3. Once the tube is installed, rotate the retainer back into
place and tighten screw.
4. Install the outlet tube in the remaining position. Once
the tube is installed, rotate the retainer back into place
and tighten screw.
Mounting
After securing the input and outlet tubes to the duct smoke
unit, (or initially placing the tubes through the 1¼” holes
drilled or punched in the HVAC duct to accept the input and
outlet tubes and then attaching them to the duct unit), hold
the duct unit assembly in position and use (2) # 12 X
3
/
4
”
sheet metal screws (packaged in the installation kit) to
secure the duct smoke detector to the HVAC duct sheet
metal.
INPUT TUBE HOLES
FACE AIR FLOW
INSERT RED STOPPER
THIS END OF INPUT TUBE
OUTLET TUBE INSTALLED
DOWNSTREAM OF AIRFLOW
DO NOT INSERT RED STOPPER
AIR FLOW DIRECTION
DUCT WIDTH
TUBE SUPPORT ONLY FOR DUCTS GREATER THAN 3 FEET WIDE
NOTE: Mountings shown
are typical. Detectors can
be installed side, bottom
or top of duct as long as
proper tube operation and
flow/pressure performance
is maintained.
Figure 3
Sampling Tube Orientation
