D341/D342 Installation Instructions EN 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. 2.0 Description Table 1: Product Description Types 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.
D341/D342 | Installation Instructions | 3.0 Assembly . 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. For example, you need a 7 ft (2.13 m) sample tube. Combine a 3 ft (0.
D341/D342 | Installation Instructions | 5.0 Mounting 5.2 5.0 Mounting 5.1 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). Preparing the Duct Figure 5: Verify the duct air flow and velocity. D341/D342 Placement 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).
D341/D342 | Installation Instructions | 5.0 . 1. Locate the mounting template and remove it from its backing (refer to Figure 6). 2. Place the mounting template over the desired location on the duct (refer to Figure 7). 3. Drill out the required holes (two) and remove any remaining debris. 4. Remove the template after the drilling is complete. 5. Place a #10-24 jack nut in each of the two 3/8 in. (9.5 mm) holes (refer to Figure 8). 6. Insert the #10-24 x 1 in.
D341/D342 | Installation Instructions | 5.0 Mounting 10. Note the direction of the airflow in the duct. Place the sample tube so the sampling holes face into the air flow (refer to Figure 12). 11. Ensure the exhaust tube is downwind from the sample tube (refer to Figure 13). 12. Insert the sample and exhaust tubes into the housing. The sample tube holes must face into the air flow. The alignment pins on the tubes must seat into the housing.
D341/D342 | Installation Instructions | 6.0 Jumpers . 6.0 Jumpers 7.0 Wiring The power card contains two jumpers: • Tamper jumper that enables or disables the housing cover tamper switch. • Reset jumper that enables or disables the remote keyswitch reset function. The power off reset functions normally regardless of the jumper setting. Figure 16 shows the location of the two jumpers on the power card. Figure 18 shows the wiring knockout holes in the smoke detector duct.
D341/D342 | Installation Instructions | 7.0 7.1 Wiring Primary Power Figure 22: D344-RT Wiring The D341 is designed for a primary power of 24 VAC, 120 VAC, or 24 VDC. 2 1 The D342 is designed for a primary power of 220 VAC, 240 VAC, 24 VDC, or 24 VAC. The D341/D342 is designed for one power source only. Do not connect a high-voltage AC source and a low-voltage AC/DC source to the same detector. GREEN 1 2 3 4 5 6 7 8 Refer to Figure 20 for 120 VAC, 220 VAC, or 240 VAC wiring.
D341/D342 | Installation Instructions | 7.0 Wiring . 7.4 DRA-5 Remote Alarm Indicator 7.6 Do not exceed a distance of 500 ft (152 m) between the DRA-5 and the D341/D342. Use #18 AWG (1.2 mm) wire or larger Multiple D341/D342s to Control Panel Refer to Figure 26 for multiple D341/D342 to control panel wiring. Figure 26: Multiple D341/D342s to Control Panel Wiring Refer to Figure 24 for the DRA-5 wiring.
D341/D342 | Installation Instructions | 8.0 Testing 7.8 Single D341/D342 for Fan Control 3. When the system is free of alarms, check each detector to ensure the red LED indicator is flashing approximately every 4 sec for the D285DH and every 11 sec for the D286. This verifies the detector is receiving power and operating properly. 4. Test each detector to ensure it will cause a control panel alarm. Reset the control panel after each test. 5.
D341/D342 | Installation Instructions | 9.0 Maintenance . Figure 30: Resetting the Detector 9.0 Maintenance NFPA-72 requires a semi-annual visual inspection of the duct smoke detectors. Clean or replace the tube filters during this inspection. Order part DS294-TF for replacements as needed. 1 4 3 2 Notify all concerned parties before and after performing maintenance or testing on the fire alarm system. At least once a year, clean the detector and base using a vacuum or clean/dry compressed air.
Bosch Security Systems, Inc. 130 Perinton Parkway Fairport, NY 14450-9199 Customer Service: (800) 289-0096 Technical Support: (888) 886-6189 © 2006 Bosch Security Systems, Inc.
