[5] DETECTOR INSTALLATION
[5.1] VERIfy DUCT AIR fLOw DIRECTION AND VELOCITy
Model D2-AUS detectors are designed to be used in air handling systems hav-
ing air velocities of 0.5 to 20.3 m/sec. Duct widths from 15.2 cm to 3.7 m can
be accommodated. Be sure to check engineering specifications to ensure that
the air velocity in the duct falls within these parameters. If necessary, use a
velocity meter (anemometer) to check the air velocity in the duct.
[5.2] DETERMINE MOUNTINg LOCATION
AND CONfIgURATION
On ducts wider than 45.7 cm it is recommended that the detector be mounted
downstream of a bend, obstruction in the duct, or the supply or return air inlet.
Exception: Installation of duct detectors can be on or within a commercial
packaged rooftop heating and air-conditioning system, fire/smoke dampers
and economizers. They may be mounted in either the supply and/or return air
section as determined by local code.
Once a suitable location is selected, determine if the detector is to be mounted
in a side-by-side “rectangular” configuration or a top-over-bottom “square”
configuration as shown in
Figure 2
. If mounting in the square configuration,
remove the rear attachment screw, rotate the unit at hinge, and replace the
screw into the new attachment hole as shown in
Figure 2
. Do NOT remove
the hinge screw during this process. Final installation approval shall be based
upon passing section 10.4.2 and 10.4.4 tests.
fIgURE 2:
REMOVE SCREW AND PIVOT
DETECTOR AS SHOWN BELOW.
REPLACE SCREW
TO SECURE DETECTOR
IN PLACE.
H0550-00
[5.3] DRILL ThE MOUNTINg hOLES
Remove the paper backing from the mounting template supplied. Affix the tem-
plate to the duct at the desired mounting location. Make sure the template lies
flat and smooth on the duct.
[5.3.1] fOR RECTANgULAR SIDE-By-SIDE MOUNTINg CONfIgURATION:
Center punch at (4) target centers: (2) “A” for sampling tubes and (2) “B” for
the rectangular configuration mounting tabs as shown on mounting template.
Drill pilot holes at target “A” centers and cut two 3.5 cm diameter holes using
a hole saw or punch. Drill 4.0 mm diameter holes at target “B” centers.
[5.3.2] fOR SqUARE TOP-OVER-BOTTOM MOUNTINg CONfIgURATION:
Center punch at (4) target centers: (2) “A” for sampling tubes and (2) “C”
for the square configuration mounting tabs as shown on mounting template.
Drill pilot holes at target “A” centers and cut two 3.5 cm diameter holes us-
ing a hole saw or punch. Drill 4.0 mm diameter holes at target “C” centers. If
desired, drill an additional 4.0 mm hole at the location of one of the mounting
tabs on the lower housing.
[5.4] SECURE ThE DUCT DETECTOR TO ThE DUCT
Use two (rectangular configuration) or three (square configuration) of the pro-
vided sheet metal screws to screw the duct detector to the duct.
CAUTION: Do not overtighten the screws.
SS-300-023
2
I56-3641-001R
[4] fIgURE 1. ExPLODED VIEw Of DUCT SMOkE DETECTOR COMPONENTS:
MAGNET TEST LOCATION
SENSOR MODULE COVER
TERMINAL HOUSING
MODULE COVER
SAMPLING TUBE
EXHAUST TUBE
SENSOR HEAD
WIRING TERMINALS
(sold seperately)
H0574-01
