Bosch D341, D342 User Manual

D341/D342

Installation Instructions

Air Duct Smoke Detector Housing

D341/D342 | Installation Instructions | 1.0 Overview

Trademarks

The National Fire Alarm Code® is a registered trademark of the National Fire Alarm Association, Inc.

Life Safety Code

is a registered trademark of the

National Fire Alarm Association, Inc.

1.0 Overview

The D341/D342 Air Duct Smoke Detector Housings are designed to mount to heating, ventilation, and air conditioning (HVAC) system ducts to monitor the presence of smoke in the conditioned air. These housings work with D285DH Photoelectric Detectors and D286 Ionization Smoke Detectors (provided separately) for general property protection.

The D341/D342 combines with an efficient housing design that samples the air passing through a duct and allows the detection of a potentially hazardous condition. When smoke is detected, the detector sends an alarm signal to the control panel that initiates the necessary action to shut off fans and blowers or to change over to other air handling systems.

The D341/D342 operates on 24 VDC, 24 VAC, 120 VAC, 220 VAC, or 240 VAC. Alarm and trouble relay contacts are provided for the control panel interface. In addition, two auxiliary Form “C” alarm relay contacts are available for other functions such as fan shutdown.

Test the system by placing an external magnet on the detector housing or switching a signal from a remote test or indicator plate.

Reset the system by shutting down power and placing a magnet on the detector housing, or by sending a signal from the remote test or indicator plate.

2.0 Description

Table 1: Product Description

Types

Optional Equipment:

D341: Air Duct Smoke Detector Housing for 24 VDC, 24 VAC, or 120 VAC operation. This housing requires a detector head.

D342: Air Duct Smoke Detector Housing for 24 VDC, 24 VAC, or 220 VAC, or 240 VAC operation. This housing requires a detector head.

D285DH : Photoelectric smoke

D286:

D344-1.5: 1.5 ft (0.46 m) sample tube D344-3: 3 ft (0.9 m) sample tube D344-5: 5 ft (1.5 m) sample tube D344-RT: Remote test kit (D307) D344-RL: Remote LED indicator kit

D344-TF: Tube filters (20 per package)

SMK-TM: Test magnet DRA-5: Remote alarm indicator EOL200: End-of-line (EOL) Module

detection head Ionization smoke detection

Head

(D306)

for sample and exhaust tubes

Install the D341/D342 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®, any applicable local and state codes, and your local authority having jurisdiction (AHJ).

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3.0 Assembly

The D341/D342 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 D341I/P and D342I/P also include a head and 1.5 ft (0.46 m) sample tube.

D341/D342 | Installation Instructions | 3.0 Assembly

For example, you need a 7 ft (2.13 m) sample tube. Combine a 3 ft (0.91 m) sample tube and a 5 ft (1.52 m) sample tube. Cut 1 ft (30.48 cm) from the narrow end.

Sample tubes that are more than 3 ft (0.91 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 (refer to Figure 2). Seal the gap between duct and sample tube.

Figure 2: Sample Tube Support Hole

4.0 Sample Tubes

Sample tubes must extend across the width of the duct. These tubes are available in three sizes:

• 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 (refer to Figure 1).

Figure 1: Sample Tube

1 2

1 - Set screw 2 - End plug

A sample tube’s maximum length is 10 ft (3.05 m); its minimum length is 1 ft (30.48 cm). You can join or cut sample tubes to make different lengths.

Sample tubes must have at least 12 sample holes within the duct. Do not cut sample tubes to less than 12 sample holes.

1 - 1 in. to 2 in. (2.5 cm to 5 cm)

You can remove a maximum of 6 in. (15 cm) from the D344-1.5 for 1 ft (0.30 m) duct installations. If using the D344-1.5 in installations where the duct width is between 12 in. (30.5 cm) and 18 in. (45.7 cm), cover some of the sample holes. There are 19 sample holes in the D344-1.5, but only 12 of them are needed for normal installation. Depending on the length, you might need to cover some of the holes with duct tape. Use even spacing when you cover sample holes. This allows for an even sample across the width of the duct (refer to Figure 3).

Figure 3: Covering Sample Tube Holes

1 - Place duct tape over these holes

To create a new sample tubes by combining two tubes:

1. Remove the roll pin and set screw from one tube.

2. Remove the end plug from the other tube.

3. Push the flared end over the tube you want to

lengthen.

4. Align the air holes and insert the set screw.

5. Reinstall the end plug.

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D341/D342 | Installation Instructions | 5.0 Mounting

5.0 Mounting

5.1 Preparing the Duct

5.2 Placing the Housing

The D341/D342 can be mounted in any direction in 90° increments without regard to air flow direction (refer to Figure 5).

Verify the duct air flow and velocity.

The D341/D342 is designed for use in air handling systems that have air velocities between 300 ft/min and 4000 ft/min (1.52 m/c to 20.3 m/c). 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 Selecting a Mounting Location

Avoid stratification and dead air space when taking a representative air sample. These conditions can be caused by return duct openings, sharp turns, connections, and long uninterrupted runs.

Place the duct smoke detectors in a range of six to ten times the width of the duct from any uninterrupted run. Refer to Figure 4 for a typical duct detector placement.

Figure 4: Typical Duct Detector Placement

Figure 5: D341/D342 Placement

2 2

1 - Bend or other obstruction 2 - Six to ten times the width of the duct 3 - Return air inlet 4 - Width of the duct

2 2

1 - Air flow 2 - Correct placement 3 - Incorrect placement

3 3

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