Bosch D340P Installation Manual

Installation Guide

Duct Smoke Detector

Housing

D340

D340 | Installation Guide | 1.0 Overview

2 Bosch Security Systems, Inc. | 7/09 | F01U071685-06

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.

D340 | Installation Guide | 4.0 Sample Tubes

Bosch Security Systems, Inc. | 7/09 | F01U071685-06 3

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 - 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.

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).

Figure 2: Support Hole Position

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 - Place tape over these sample holes

D340 | Installation Guide | 5.0 Mounting

4 Bosch Security Systems, Inc. | 7/09 | F01U071685-06

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

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 - Return air inlet

2 - Six to ten times the width of the duct

3 - Width of duct

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

2 2

1 1

1 - Air flow

2 - Correct mounting position

3 - Incorrect mounting position

D340 | Installation Guide | 5.0 Mounting

Bosch Security Systems, Inc. | 7/09 | F01U071685-06 5

1. Locate the D340 mounting template (Figure 7) and

remove it from its backing.

Figure 7: D340 Mounting Template

DUCT SMOKE DETECTOR

MOUNTING TEMPLATE

REMOVEABLE AFTER DRILLIN G

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

(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

16.070 in. (40.8 cm)

6.480 in. (16.5 cm)

DUCT SMOKE DETECTOR

MOUNTING TEMPLATE

REMOVEABLE AFTER DRILL ING

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.

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 - Two 10-24 x 1-in. machine screws

9. Locate the wiring knockout holes (Figure 12).

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