System Sensor D2 - Manual (Page 2)

[5] DETECTOR INSTALLATION
[5.1] VERIfy DUCT AIR fLOw DIRECTION AND VELOCITy
Model D2 detectors are designed to be used in air handling systems having air
velocities of 100 to 4000 feet per minute. Duct widths from 6 inches to 12 feet
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 18 inches 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 1.375 inch diameter holes us-
ing a 1
3 /
8
inch hole saw or punch. Drill .156 inch diameter holes using a 5 /
32
”
inch drill 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 1.375 inch diameter holes using a
1
3 /
8
” inch hole saw or punch. Drill .156 inch diameter holes using a 5 /
32
inch
drill at target “C” centers. If desired, drill an additional .156 inch 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-300-014 2 I56-3050-004R
[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)
H0574-05