Bosch D340P Installation Manual
D340
Installation Guide
EN
Duct Smoke Detector
Housing
D340 | Installation Guide | 1.0 Overview
Trademarks
The National Fire Alarm Code® is a registered
trademark of the National Fire Protection Association.
®
Life Safety Code
is a registered trademark of the
National Fire Protection Association.
1.0 Overview
The D340 Air Duct Smoke Detector Housing is
designed to mount to the ducts of heating, ventilation,
and air-conditioning (HVAC) systems to monitor the
presence of smoke in the conditioned air.
Use the D340 with the D285DH Photoelectric Smoke
Detector (provided separately). The detector is
combined with an efficient housing design to sample
the air passing through a duct and detect potentially
hazardous conditions. When it detects smoke, the
detector sends an alarm signal to the control panel.
The control panel initiates the necessary action to shut
off fans and blowers or to switch to other air handling
systems.
The D340 operates on a two-wire loop, and requires a
smoke detector head.
Test the system by placing an external magnet on the
housing or switching the keyswitch from a Remote
Test station. Reset control requires a 24 V supply from
the control panel or an external power supply.
You can reset the detector by shutting down zone
power. If your system has a D344-RT Remote Test Kit,
you can reset the system using the keyswitch.
Install the D340 according to:
• NFPA 90A: Standard for the Installation of Air
Conditioning and Ventilating Systems
®
• NFPA 72: National Fire Alarm Code
• NFPA 101: Life Safety
Code®
• IBC: International Building Code
• IFC: International Fire Code
• Any applicable local and state codes
• Local authority having jurisdiction (AHJ)
2.0 D340 Options
Table 1: D340 Options
Options Description
D285DH Photoelectric smoke detector head
D344-1.5 1.5 ft (0.5 m) sample tube
D344-3 3 ft (1 m) sample tube
D344-5 5 ft (1.5 m) sample tube
D344-RT Remote Test Kit (D307)
D344-RL Remote LED Indicator Kit (D306)
D344-TF Tube filters for sample and exhaust tubes
(20 per package)
SMK-TM Test magnet
DRA-5 Remote alarm indicator
D275 End-of-line (EOL) module
3.0 Assembly
The D340 includes:
• One housing, power card, and cover assembly
• Two #10-24 x 1 in. machine screws for mounting
• Two #10-24 jack nuts
• One exhaust tube
• Two tube clamps with four screws
• Two foam gaskets
• Two air filters
• One drilling template
• One cover gasket
The D340P also includes a smoke detector head and
1.5 ft (0.5 m) tube.
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4.0 Sample Tubes
The sample tubes must extend across the width of the
duct. The three sizes of sample tubes are:
• D344-1.5 (1.5 ft [0.46 m])
• D344-3 (3 ft [0.91 m])
• D344-5 (5 ft [1.52 m])
Sample tubes include an end plug that must be
installed in the narrow end of the tube (Figure 1).
Figure 1: D344-1.5 Sample Tube
1
1 - Set screw 2 - End plug
You can combine or cut sample tubes to make
different lengths. A sample tube can be a maximum
length of
10 ft (3 m) or a minimum length of 1 ft (0.3 m). For
example, you can join a 3 ft (1 m) and a 5 ft (1.5 m) to
make an 8 ft (2.4 m) sample tube.
To combine sample tubes:
1. Remove the roll pin and set screw from one of the
sample tubes.
2. Remove the end plug from the other sample tube.
3. Push the flared end over the sample tube you want
to lengthen.
4. Align the holes, insert the set screw, and reinstall
the end plug. For example, if you want a 7 ft (2 m)
sample tube, combine a 3 ft (1 m) sample tube and
a 5 ft (1.5 m) sample tube. Then cut 1 ft (0.3 m)
from the narrow end to get the necessary length.
Sample tubes must have at least 12
sample holes within the duct. Do not cut
sample
tube to less than 12 sample holes.
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D340 | Installation Guide | 4.0 Sample Tubes
Figure 2: Support Hole Position
1
1 - 1 in. to 2 in. (2.5 cm to 5 cm)
5. Seal the gap between duct and sample tube. You
can remove up to 6 in. (15 cm) from the D344-1.5
for 1 ft (0.3 m) duct installations.
When using the D344-1.5 in installations where the
duct width is between 12 in. (31 cm) and 18 in.
(46 cm), cover some of the sample holes. The
D344-1.5 has 19 sample holes, but only 12 are
required for normal installations. Depending on
the length, you might have to cover some of the
holes with duct tape. Use even spacing when
covering the sample holes to allow an even sample
across the width of the duct. Refer to Figure 3.
Figure 3: D344-1.5 Sample Tube
1
1 - Place tape over these sample holes
Sample tubes over 3 ft (1 m) must be supported at
the end opposite the duct detector. The support
hole should be 1 in. to 2 in. (2.5 cm to 5 cm) below
the entry hole to allow for possible moisture
drainage (Figure 2).
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D340 | Installation Guide | 5.0 Mounting
5.0 Mounting
5.1 Preparing the Duct
You must verify the duct air flow and velocity. The
D340 is designed for use in air handling systems with
air velocities between 300 ft/min and 4000 ft/min
(1.5 m/sec to 20.3 m/sec). Check the HVAC
engineering specifications to ensure the air velocity in
the duct falls within these parameters. If necessary, use
a velocity meter to check the air velocity in the duct.
5.1 Determining the Mounting Location
To obtain a representative air sample, avoid
stratification and dead air space. These conditions can
be caused by return duct openings, sharp turns,
connections, or long, uninterrupted runs. For this
reason, place the D340 in the range of six to ten times
the width of the duct from any uninterrupted run.
Refer to Figure 4 and Figure 5.
Figure 4: Typical D340 Placement – Example A
5.2 Positioning the D340
The D340 can be mounted in any direction of 90°
increments without regard to the air flow direction
(Figure 6).
Figure 6: D340 Positions
1
2 2
1 1
2
2
1
1
3
2
1 - Bend or other obstruction
2 - Six to ten times the width of the duct
3 - Width of duct
Figure 5: Typical D340 Placement – Example B
1
3
2
1 - Return air inlet
2 - Six to ten times the width of the duct
3 - Width of duct
1 1
2 2
3
1 - Air flow
2 - Correct mounting position
3 - Incorrect mounting position
1
3
1
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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
1
DUCT SMOKE DETECTOR
MOUNTING TEMPLATE
REMOVEABLE AFTER DRILLIN G
6
D340 | Installation Guide | 5.0 Mounting
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
3
4
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
16.070 in. (40.8 cm)
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 MOUN TING
DUCT SMOKE DETECTOR
MOUNTING TEMPLATE
REMOVEABLE AFTER DRILL ING
1
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
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
1 - Two 10-24 x 1-in. machine screws
9. Locate the wiring knockout holes (Figure 12).
1
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.
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