DH100LP Air Duct Smoke Detector with Extended Air Speed Range

[5.3] Secure The Detector Housing To The DuctSlide the foam gaskets over the tube bushings as shown inFigure 3. Use the two machine screws to screw the detectorhousing to the duct.CAUTION: Do not overtighten the screws.Figure 3. Installation of foam gaskets over samplingtube bushings:SCREW HOLES FORATTACHING HOUSINGTO DUCT WORK.A78-2045-00[5.4] Sampling Tube Installation of Ducts GreaterThan 1 1 ⁄2 Feet WideThe sampling tube is identified by a series of air inlet holeson the tube. One plastic tube is included for ducts up to 18″in width. All other lengths must be purchased separately.Order the correct length, as specified in Table 1, for widthof the duct where it will be installed. The exhaust tube ismolded onto the base of the duct housing, and theA2440-00 Exhaust Tube Extension is available as an accessoryin those cases where the molded exhaust port does notextend at least 2 inches into the duct.The inlet tube is always installed with the air inlet holesfacing into the air flow. To assist proper installation, thetube’s mounting flange is marked with arrows. Make surethe inlet tube is mounted so that the arrows point into theair flow (see Figure 4). Figure 5 shows the various combinationsof tube mounting configurations with respect to airflow. Mounting the detector housing in a vertical orientationis acceptable, provided that the air flows directly intothe sampling tube holes as indicated in Figure 4.Table 1. Inlet tubes required for different ductwidths:Outside Duct Width Inlet Tube Required1 to 2 ft. ST-1.52 to 4 ft. ST-34 to 8 ft. ST-58 to 12 ft. ST-10[5.4.1] Installation For Ducts Greater Than 1 1 ⁄2 FeetBut Less Than 8 Feet Wide1. If the tube is longer than the width of the air duct, drill a3⁄4-inch hole in the duct opposite the hole already cut forthe inlet tube. Make sure the hole is 1″ to 2″ below theinlet hole on the opposite side of the duct to allow formoisture drainage. If the tube is shorter than the width ofthe air duct, install the end plug into the inlet tube asshown in Figure 4. Sampling tubes over 3 ft. long must besupported at the end opposite the duct detector.2. Slide the tube into the housing bushing that meets theair flow first. Position the tube so that the arrows pointinto the air flow.3. Secure the tube flange to the housing bushing with two#6 self-tapping screws.4. For tubes longer than the width of the air duct, the tubeshould extend out of the opposite side of the duct. Ifthere are more than 2 holes in the section of the tubeextending out of the duct, select a different length usingTable 1. Otherwise, trim the end of the tube protrudingthrough the duct so that 1″ to 2″ of the tube extend outsidethe duct. Plug this end with the end plug and tapeclosed any holes in the protruding section of the tube. Besure to seal the duct when the tube protrudes.Figure 4. Air duct detector inlet samplingAIR HOLESFLANGE8-2047-00Figure 5. Tube mounting configurations with varyingair flow direction:AIR FLOWDIRECTIONDETECTORHOUSINGAIR FLOWDIRECTIONDETECTORHOUSINGARROWSMUST FACEINTO AIR FLOWINLETTUBEEXHAUSTTUBEDOTS INDICATE POSITION OFSAMPLING TUBE HOLESA. B.EXHAUSTTUBEINLETTUBEHORIZONTAL MOUNTING OF HOUSINGEXHAUSTTUBEEXHAUSTTUBEINLETINLETTUBETUBEC. D.VERTICAL MOUNTING OF HOUSINGAIR FLOW DIRECTIONINLETTUBEENDPLUGAIR FLOWDIRECTIONDETECTORHOUSINGDETECTORHOUSINGAIR FLOWDIRECTIONA78-1812-08NOTE: Only metal sampling tubes may be used on orientationsC and D.D200-15-00 3 I56-0083-00