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The document specifies physical dimensions, operating temperature and humidity ranges, duct air velocity limits, and electrical input/current requirements across 120/240 VAC and 24 VAC/DC. It describes the housing purpose, alarm indication and control relay outputs, required kit contents, ordering notes for inlet tubes and detector heads, and the structured installation/testing sequence, emphasizing NFPA 72 maintenance and annual cleaning.",{"@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/dh500acdc-intelligent-air-duct-smoke-detector-housing-installation-and-maintenance-instructions/389999/",{"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/dh500acdc-intelligent-air-duct-smoke-detector-housing-installation-and-maintenance-instructions/389999.png","ImageObject",300,407,{"name":92,"@type":93},"dhado","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-29","2026-09-25",true,{"@type":102,"interactionType":103,"userInteractionCount":39},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What detector heads are compatible with the DH500ACDC housing?","Question",{"text":112,"@type":113},"The DH500ACDC housing is used with System Sensor Model 1551 ionization detector heads and Model 2551 photoelectronic detector heads, which are purchased separately.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How often should the detector be tested and cleaned?",{"text":117,"@type":113},"The detector must be tested and maintained regularly following NFPA 72 requirements, and it should be cleaned at least once a year.",{"name":119,"@type":110,"acceptedAnswer":120},"What is the purpose of using the duct smoke detector housing in an HVAC system?",{"text":121,"@type":113},"Smoke introduced into the air duct system is distributed throughout the building, and the housing samples duct air to sense smoke and generate an alarm signal so actions can be taken to shut off fans, blowers, or change air-handling operation.","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},389999,1790618729,{"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":39,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":41,"preview_page_count":4},5909893218464,"https://ap-avatar.wpscdn.com/davatar_085a072bc5b1113ac321206ff7593b45","INSTALLATION AND MAINTENANCE INSTRUCTIONS  \nDH500ACDC Intelligent Air Duct Smoke Detector Housing  \n3825 Ohio Avenue, St. Charles, Illinois 60174 1-800-SENSOR2, FAX: 630-377-6495 [www.systemsensor.com](www.systemsensor.com)  \nSpecifications  \nLength: 14.5 inches (36.7 cm.)  \nWidth: 5 inches (12 .7 cm.)  \nDepth: 4 inches (10 .2 cm.)  \nWeight: 4 lbs. (1.8 kg.)  \nOperating Temperature Range: 32° to 120°F (0° to 49°C)  \nOperating Humidity Range: 10% to 93% Relative Humidity  \nDuct Air Velocity: 500 – 4000 ft./min. (91 .4 – 1219.2 m/min.  \nPower Supply Electrical Ratings For DH500ACDC  \n\n| | 120 VAC (102-132)\u003Cbr>mA rms MAX. |  | 240 VAC (204-264)\u003Cbr>mA rms MAX. |  | 24 VAC (20.6-26.4)\u003Cbr>mA rms MAX. |  | 24 VDC (20-30) mA DC MAX. |  |\n| --- | --- | --- | --- | --- | --- | --- | --- | --- |\n| Device | Standby | Alarm | Standby | Alarm | Standby | Alarm | Standby | Alarm |\n| DH500ACDC | 44 | 52 | 25 | 30 | 65 | 182 | 26 | 87 |\n| PA400* | -- | 3 | -- | 1.5 | -- | 29 | -- | 15 |\n| RA400ZA* | -- | 1.5 | -- | 1 | -- | 17.3 | -- | 10 |\n| RTS451/RTS451KEY* | -- | 1.5 | -- | 1 | -- | 17.3 | -- | 10 |\n| | 11.5 | 13 | 5.5 | 6.5 | 140 | 157 | 95 | 103 |\n\nThe currents shown for the DH500ACDC are maximum values with no accessories.  \n* All accessory currents are additional to DH500ACDC. There are no additional currents for accessories in standby.  \n** RTS451/RTS451KEY when the magnet is held in place to initiate an alarm.  \n24V output maximum load is 80 mA; auxiliary alarm output maximum load is 20 mA.  \nAuxiliary Relay Contacts  \nMinimum contact current must be greater than 500 mA at 24 VDC  \n10 amps maximum at 30 VDC  \n10 amps maximum at 250 VAC  \nBefore Installing  \nPlease thoroughly read the System Sensor Manual I56- 473-XX, Guide for Proper Use of Smoke Detectors in Duct Applications, which provides detailed information on detector spacing, placement, zoning, wiring, and special applications. Copies of this manual are available at no charge from System Sensor. NFPA Standards 72 and 90A should also be referenced for detailed information.  \nNOTICE: This manual should be left with the owner/user of this equipment.  \nIMPORTANT: This detector must be tested and maintained regularly following NFPA 72 requirements. The detector should be cleaned at least once a year.  \nGeneral Description  \nAn HVAC system supplies conditioned air to virtually every area of a building. Smoke introduced into this air duct system will be distributed to the entire building. Smoke detectors designed for use in air duct systems are used to sense the presence of smoke in the duct.  \nThe DH500ACDC Air Duct Detector Housings are used with System Sensor’s Model 1551 ionization detector heads and Model 2551 photoelectronic detector heads (purchased separately) . These two smoke detection methods are combined with an efficient housing design that samples air passing through a duct and allows detection of a developing hazardous condition. When sufficient smoke is sensed, an alarm signal is initiated at the fire control panel monitoring the detector, and appropriate action can be taken to shut off fans and blowers, change over air handling systems, etc. This can prevent the distribution of toxic smoke and fire gases throughout the areas served by the duct system.  \nFigure 1:  \nCONDUIT  \nHOLES  \nDUCT DETECTOR HOUSING  \nPC BOARD INSULATOR  \nDETECTOR HEAD (SUPPLIED SEPARATELY)  \nEXHAUST FILTER ADAPTER  \nDETECTOR BASE  \nFOAM GASKETS  \nHOUSING  \nMOUNTING SCREWS  \nTEST MAGNET  \nSee Note 1 below for inlet sampling tube and detector supply information.  \nH0309-00  \nThe DH500ACDCs are built to operate on 120/240 VAC or 24 VAC/DC. Two form-C (SPDT) relay contacts are available for control purposes. Two LEDs on each detector latch on to provide a local alarm indication. Remote alarm indication is made possible by using the auxiliary alarm output (see Figure 5) . The duct detector can be tested and alarm can be reset by using the correct respective code commands from the panel. See panel i","cbCaijxZRbPsqINb","https://ap.wps.com/l/cbCaijxZRbPsqINb","pdf",453180,12,"English","# Before Installing\n# General Description\n# Contents Of The Duct Detector Housing Kit\n# Installation Sequence\n## Step 1. Verify Duct Air Flow Direction And Velocity\n## Step 2. Drill The Mounting Holes","[{\"question\":\"What detector heads are compatible with the DH500ACDC housing?\",\"answer\":\"The DH500ACDC housing is used with System Sensor Model 1551 ionization detector heads and Model 2551 photoelectronic detector heads, which are purchased separately.\"},{\"question\":\"How often should the detector be tested and cleaned?\",\"answer\":\"The detector must be tested and maintained regularly following NFPA 72 requirements, and it should be cleaned at least once a year.\"},{\"question\":\"What is the purpose of using the duct smoke detector housing in an HVAC system?\",\"answer\":\"Smoke introduced into the air duct system is distributed throughout the building, and the housing samples duct air to sense smoke and generate an alarm signal so actions can be taken to shut off fans, blowers, or change air-handling operation.\"}]","DH500ACDC Intelligent Air Duct Smoke Detector Housing - Installation and Maintenance Instructions | PDF",1790329034]