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Figure 2. Speed nut mounting location:
HOLE B
HOLE A
CAUTION: Do not overtighten the screws.
Exception: Where it is physically impossible to locate the
detector accordingly, the detector can be positioned closer
than six duct widths, but as far as possible from the open-
ing, bend, or deflection plates.
Step 3. Mount Duct Housing
Remove the duct housing cover. Slide the foam gaskets over
the tube bushings as shown in Figure 2A. Make sure the
two small holes in the gaskets line up with the two duct
housing mounting holes. Put one 5/16-inch O-ring over
each of the two #10 sheet metal screws. Use the two sheet
metal screws to secure the duct housing to the duct.
Table 1. Sampling (Inlet) Tubes
TUBE
OUTSIDE DUCT WIDTH
ST-1.5
1 to 2 ft.
ST-3
2 to 4 ft.
ST-5
4 to 8 ft.
ST-10
8 to 12 ft.
Figure 3. Air duct detector inlet sampling tube:
FLANGE
D500-07-00
DUCT
WALL
SPEED
NUT
H0116-00
(0.3 to 0.6 m)
(0.6 to 1.2 m)
(1.2 to 2.4 m)
(2.4 to 3.7 m)
AIR HOLES
ARROWS
MUST FACE
INTO AIR FLOW
Figure 2A. Installation of foam gaskets over sam-
pling tube bushings:
SAMPLING
MOUNTING
TUBE BUSHING
SCREWS
O-RINGS
SCREW HOLES FOR ATTACHING
DETECTOR HOUSING TO DUCT
Step 4. Install The Inlet Tube
The inlet tube (shown in Figure 3) is identified by a series
of air inlet holes on the tube. This tube must be purchased
separately. Order the correct length, as specified in Table
1, for the width of the duct where it will be installed. The
exhaust tube is molded into the base of the duct housing.
The inlet tube should be installed in the inlet sampling
tube bushing located in the center of the duct detector
housing. (See Figure 2A.) The air inlet holes must face into
the air flow. To assure proper installation, the tube mount-
ing flange is marked with arrows. Mount the inlet tube so
that the arrows point into the air flow. Figure 4 shows the
various combinations of duct detector and tube mounting
configurations with respect to air flow.
AIR FLOW DIRECTION
3
DUCT DETECTOR
HOUSING
EXHAUST TUBE
(EXTENSION BUSHING)
FOAM
GASKETS
H0117-00
INLET
TUBE
END
PLUG
H0108-00
I56-432-11R
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