P/N 315-049708FA-4
6
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.
Air Duct Sampling Tube Pressure Measurement
The Model 8883 Pressure Differential Measuring device
should be used to ensure that the sampling tube pressure
differential is within the specified limits. The differential
pressure between the two tubes should be greater than 0.01
inches of water and less than 1.2 inches of water. Qualified
personnel should take measurements in accordance with
the 8883 instructions, P/N 315-085535FA.
WIRING
Conduit Knockouts To remove plastic knockout, first cut the plastic tab on the
specific knockout. Refer to Figure 4 to locate the tab. Then,
using a screw driver placed at the tab location, tap with a
hammer until the knockout breaks out. Clean the hole before
installing conduit.
PLASTIC TAB
KNOCKOUT
SIDE REAR OF AIR DUCT HOUSING
KNOCKOUT FACTORY
REMOVED
Figure 4
Removing the Knockouts
