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Describes detector operation using the Venturi sampling tubes, alarm thresholds, allowable duct widths and air velocities, and required pressure differential verification with a Magnehelic gauge. Provides wiring/terminal guidance for trouble and alarm contacts, supported input voltages, remote accessories compatibility, and detailed at-a-glance model, head models, and electrical/current ratings.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/installation-and-maintenance-instructions-for-sl-2000-series-duct-smoke-detectors/390001/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/installation-and-maintenance-instructions-for-sl-2000-series-duct-smoke-detectors/390001.png","ImageObject",300,407,{"name":92,"@type":93},"mieayamfan","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-29","2026-09-25",true,{"@type":102,"interactionType":103,"userInteractionCount":24},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What HVAC locations and applications are suitable for SL-2000 series duct smoke detectors?","Question",{"text":112,"@type":113},"They are intended for early detection of smoke and combustion products in air moving through HVAC duct supply/return in commercial, industrial, and residential applications. They should not be used for open area protection or as a substitute for a regular fire detection system.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How does the duct smoke detector sample air to trigger an alarm?",{"text":117,"@type":113},"Air is drawn into the inlet sampling tube facing the airflow, passes over the detector head, and is exhausted back into the HVAC duct via the exhaust tube. When smoke particle concentration reaches the detector head’s alarm threshold, the unit enters alarm.",{"name":119,"@type":110,"acceptedAnswer":120},"How can correct installation be verified for the SL-2000 duct detector?",{"text":121,"@type":113},"Measure the pressure differential between the sampling (high side) and exhaust (low side) tubes using a Magnehelic pressure gauge or equivalent. An acceptable reading is between 0.01 and 1.2 inches of water, and the detector should be placed downstream of obstructions to reduce turbulence effects.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},390001,1791135408,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":24,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":29,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":144,"preview_page_count":4},962090893677,"https://ap-avatar.wpscdn.com/davatar_3d24733baf745e90a7e4bdd5f77d97b2","AIR PRODUCTS AND CONTROLS INC.  \nINSTALLATION AND MAINTENANCE INSTRUCTIONS FOR SL-2000 SERIES DUCT SMOKE DETECTORS   \nSL-2000-N 4-Wire, Ionization Type SL-2000-P 4-Wire, Photoelectric Type  \nPRODUCT OVERVIEW  \nPRODUCT APPLICATION  \nSL-2000 Series duct smoke detectors provide early detection of smoke and products of combustion present in air moving through an HVAC duct supply, return, or both in commercial, industrial, and residential applications. These devices are designed to prevent therecirculation of smoke in areas by the air handling system’s fans and blowers. Complete systems may be shut down in the event of smoke detection.  \n* NOTE: For the correct installation of a duct smoke unit, please refer to the NFPA 72 (National Fire Alarm Code), NFPA 90A (Standard for Installation of Air Conditioning and Ventilation Systems),NFPA 92A (Recommended Practice for Smoke Control Systems.), NFPA 5000 (Building Construction and Safety Code), IMC (International Mechanical Code), and IFC (International Fire Code).  \nThis detector is not intended for open area protection nor should it be used for early warning detection or replace a regular fire detection system.  \nPRODUCT DESCRIPTION  \nThe SL-2000 Series smoke detector is fitted with a mounting base that will accept an ionization smoke detector head model 55000- 225APO or photoelectric smoke detector head model 55000- 328APO. The duct unit supports two sets of form“C”alarm contacts, one form“A”alarm contact and one form“C” trouble contact. The trouble contact supervises the presence of the input power, removal of the detector cover and the removal of the smoke detector head.  \n* This detector is equipped with a cover removal switch that instantly provides a trouble condition upon removal of the clear cover. For all testing and inspection with the cover removed, the cover removal switch (designated as SW1 on PCB) must be manually depressed to simulate standard“pilot” operation. THE TROUBLE CONTACTS (TERMINALS 4, 15, 5) ARE SHOWN IN THE NON-ENERGIZED CONDITION.  \nThe trouble contacts will not operate in the event of a smoke alarm. The SL-2000 Series duct detector will operate from various input voltage sources; namely 24VAC, 24VDC, 115VAC and 230VAC.  \nSAMPLING TUBES  \nThe operating principle of a duct detector is based on the Venturi effect. Two tubes extend into the HVAC duct. Air flowing through the duct is forced into the air intake (inlet) tube via the air intake holes,(facing the airflow) and passes over the detector head. The air will be drawn out via the exhaust tube back into the HVAC duct. (A 7”exhaust tube is provided in the installation kit. ) When the concentration of smoke particles suspended in the air stream reach the alarm threshold of the detector head, the unit will go into alarm.  \nThe duct smoke detector units are designed to operate in duct widths from 6” to 10’wide with an air velocity between 100 to 4,000 feet per  \nminute. To verify correct installation, the pressure differential between the sampling (high side) and exhaust (low side) tubes should be measured using a Magnehelic pressure gauge or equivalent. An acceptable reading is between 0.01 and 1.2 inches of water.  \nTo minimize the impact of air turbulence and stratification on performance, a duct smoke detector should be located as far as possible downstream from any obstruction (i.e. deflector plates, elbows, dampers, etc.) . In all situations, confirmation of velocity and pressure differential within specifications is required.  \nREMOTE ACCESSORIES  \nAudible and visual alarm indicators, remote status indicators, and remote reset/test switches can be accommodated by the SL-2000 Series duct units by connecting to DC voltage output terminals as described on Page 4. These terminals are not supervised and the voltage/current will only be present when the detector unit is in alarm. The remote pilot (green) LED will be permanently illuminated when connected to the output terminals as long as input power and detec","cbCaistVyWOF3P6i","https://ap.wps.com/l/cbCaistVyWOF3P6i","pdf",1152348,"English","# Product Overview\n## Product Application\n## Product Description\n# Sampling Tubes\n## Operating Principle\n## Installation Verification\n# Remote Accessories\n# SL-2000 At-A-Glance\n## Models and Detector Head Models\n## Electrical and Contact Ratings\n# Mechanical Installation\n## Location Prerequisites","[{\"question\":\"What HVAC locations and applications are suitable for SL-2000 series duct smoke detectors?\",\"answer\":\"They are intended for early detection of smoke and combustion products in air moving through HVAC duct supply/return in commercial, industrial, and residential applications. They should not be used for open area protection or as a substitute for a regular fire detection system.\"},{\"question\":\"How does the duct smoke detector sample air to trigger an alarm?\",\"answer\":\"Air is drawn into the inlet sampling tube facing the airflow, passes over the detector head, and is exhausted back into the HVAC duct via the exhaust tube. When smoke particle concentration reaches the detector head’s alarm threshold, the unit enters alarm.\"},{\"question\":\"How can correct installation be verified for the SL-2000 duct detector?\",\"answer\":\"Measure the pressure differential between the sampling (high side) and exhaust (low side) tubes using a Magnehelic pressure gauge or equivalent. An acceptable reading is between 0.01 and 1.2 inches of water, and the detector should be placed downstream of obstructions to reduce turbulence effects.\"}]","INSTALLATION AND MAINTENANCE INSTRUCTIONS FOR SL-2000 SERIES DUCT SMOKE DETECTORS | PDF",1790329041,15]