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.
1. Locate the D340 mounting template (Figure 7) and
remove it from its backing.
Figure 7:
D340 Mounting Template
5
2
3
4
1 - 16 in. (41 cm)
2 - 6.5 in. (16.5 cm)
3 - Two 1-3/4-in. (45-mm) diameter holes for the
sample tubes
4 - Two 3/8-in. (9.5-mm) diameter holes for
mounting to the duct
5 - 1.5 in. (38.1 mm)
6 - 8.0 in. (20.5 cm)
2. Place the template over the desired location on the
duct (Figure 8).
Figure 8:
D340 Template Placement
6.480 in. (16.5 cm)
(2) 1-3/4 in. (44.5 mm) DIA. HOLES FOR SAMPLING TUBES
(2) 3/8 in. (9.5 mm) DIA. HOLES FOR DUCT MOUNTING
3. Drill out the required holes and remove any
remaining debris.
4. Remove the template.
5. Place a #10-24 jack nut (Figure 9) in each of the
3/8 in. (9.5 mm) holes.
Figure 9:
Jack Nuts
6. Insert the #10-24 x 1 in. machine screws into the
jack nuts and firmly tighten.
Bosch Security Systems, Inc. | 7/09 | F01U071685-06
1
6
DUCT SMOKE DETECTOR
MOUNTING TEMPLATE
REMOVEABLE AFTER DRILLING
4
16.070 in. (40.8 cm)
DUCT SMOKE DETECTOR
MOUNTING TEMPLATE
REMOVEABLE AFTER DRILLING
D340 | Installation Guide | 5.0
This attaches the jack nuts to the duct. You might
have to hold the jack nuts with a installer wrench
or a pair of pliers while tightening the screws to
stop the jack nut from spinning in the hole.
Remove the screws for later use.
7. Place the two foam gaskets over the sample and
exhaust ports on the back of the D340 (Figure 10).
Figure 10: Gasket Placement
1 - Foam gasket (2)
8. Mount the D340 to the jack nuts using the
supplied
10-24 x 1-in. machine screws (Figure 11).
Remember that overtightening the screws can
cause excessive bowing of duct.
Figure 11: Mounting the D340 to the Jack Nuts
1
1 - Two 10-24 x 1-in. machine screws
9. Locate the wiring knockout holes (Figure 12).
Mounting
1
5
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