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.
10. Locate the sample and exhaust tubes (Figure 13).
Ensure the sample tube has a plug installed at the
narrow end of the assembly.
Figure 13: Exhaust and Sample Tubes
1
3
1 - Exhaust tube
2 - Leave end open
11. Note the direction of the airflow in the duct. The
sampling holes in the sample tube must face into
the air flow (Figure 14). The exhaust tube must be
downwind from the sample tube (Figure 15).
Figure 14: Duct Air Flow
1
1 - Air flow
Figure 15: Exhaust Tube Position
1
1 - Air flow
2 - Sample tube
3 - Exhaust tube down stream from sample tube
12. Insert the sample and exhaust tubes into the D340,
ensuring the sample tube holes face into the air
flow. Ensure the tube alignment point set into the
D340.
Bosch Security Systems, Inc. | 7/09 | F01U071685-06
2
4
3 - Sample tube
4 - Insert plug
2
2 - Sample holes
3
2
D340 | Installation Guide | 5.0
13. Secure the tubes in place using the tube clamps
provided (Figure 16).
Figure 16: Sample and Exhaust Tubes in D340
1
2
1 - Exhaust tube
2 - Sample tube
14. Place the tube filters over the open ends of the
sample and exhaust tubes (Figure 17).
Figure 17: Tube Filters
2
1 - Exhaust tube
2 - Sample tube
NFPA-72 requires a semi-annual visual
inspection of detector housings. Clean or
replace the tube filters at this time. If
replacement filters are needed, order the
D344-TF.
Mounting
3
4
3 - D340
4 - Tube clamps (2)
1
4
3
3 - D340
4 - Tube filters (2)
7
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