[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-390003-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-390003-en":131},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","d4120-duct-smoke-detector-installation-and-maintenance-instructions","D4120 Duct Smoke Detector - Installation and MainTenance Instructions","","D4120 duct smoke detector installation and maintenance instructions describe system components, operating and storage temperature ranges, allowable humidity, air velocity requirements, and footprint dimensions for the detector and its sensor/power board modules. The guide specifies electrical power supply behavior, reset and alarm response timing, sensitivity testing notes, and contact ratings for alarm initiation, supervisory, and auxiliary circuits, including accessory current load limits. It also outlines limitations of duct smoke detection, installation and sampling tube setup steps, wiring guidance, unit configuration, status indication, detector cleaning and sensor replacement, and verification and warranty information.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/healthcare/","Healthcare",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/d4120-duct-smoke-detector-installation-and-maintenance-instructions/390003/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/d4120-duct-smoke-detector-installation-and-maintenance-instructions/390003.png","ImageObject",300,407,{"name":42,"@type":43},"nayy☆","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-28","2026-09-25",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",13,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What components make up the D4120 duct detector?","Question",{"text":63,"@type":64},"The D4120 duct detector consists of the D4P120 Power Board component and the D4S Sensor component.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"What temperatures and humidity conditions does the detector support?",{"text":68,"@type":64},"Operating temperature is specified for D4120 & D4S as –4°F to 158°F (–20°C to 70°C) and for D4P120 as –40°F to 158°F (–40°C to 70°C). Storage temperature is also listed for each component, with humidity range of 0% to 95% relative humidity non-condensing.",{"name":70,"@type":61,"acceptedAnswer":71},"Why must duct smoke detectors not be used as substitutes for open-area detector protection?",{"text":72,"@type":64},"The document warns that duct detectors must not be used as a substitute for open area detector protection for life safety and are not a substitute for early warning in a building’s regular fire detection system.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},390003,1790625060,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,106,110,115,120,123,127],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":97,"doc_module":4,"doc_module_name":25,"category_name":98,"show_sort_weight":99,"slug":100},5,"Comic",60,"comic",{"id":102,"doc_module":4,"doc_module_name":25,"category_name":103,"show_sort_weight":104,"slug":105},6,"Technology",50,"technology",{"id":107,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":108,"slug":109},7,40,"healthcare",{"id":111,"doc_module":4,"doc_module_name":25,"category_name":112,"show_sort_weight":113,"slug":114},8,"Research & Report",30,"research-report",{"id":116,"doc_module":4,"doc_module_name":25,"category_name":117,"show_sort_weight":118,"slug":119},9,"Religion & Spirituality",20,"religion-spirituality",{"id":118,"doc_module":4,"doc_module_name":25,"category_name":121,"show_sort_weight":118,"slug":122},"World Cup","world-cup",{"id":124,"doc_module":4,"doc_module_name":25,"category_name":125,"show_sort_weight":124,"slug":126},10,"Lifestyle","lifestyle",{"id":128,"doc_module":4,"doc_module_name":25,"category_name":129,"show_sort_weight":97,"slug":130},19,"General","general",{"code":4,"msg":82,"data":132},{"doc_id":79,"user_id":133,"nickname":42,"user_avatar":134,"doc_module":4,"category_id":107,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":111,"language":140,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":12,"update_tm":144,"read_time":118,"preview_page_count":4},962090893153,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","inSTaLLaTion and mainTenance inSTrucTionS  \nd4120 duct Smoke detector d4S Sensor component d4P120 Power board component  \n3825 Ohio Avenue, St. Charles, Illinois 60174 1-800-SENSOR2, FAX: 630-377-6495 [www.systemsensor.com](www.systemsensor.com)  \nI 56-2967-002R  \nNOTE: The D4120 duct detector consists of D4P120 Power Board component and the D4S Sensor component.  \nSPecificaTionS  \nOperating Temperature: D4120 & D4S: –4° to 158° F (–20° to 70° C) D4P120: –40° to 158° F (–40° to 70° C) Storage Temperature: D4120 & D4S: –22° to 158° F (–30° to 70° C) D4P120: –40° to 158° F (–40° to 70° C)  \nHumidity: 0% to 95% Relative Humidity Non-condensing  \nAir Velocity: 100 to 4000 ft./min. (0 .5 to 20.3 m/sec.)  \nD4120 Footprint Dimensions: Rectangular-14.38 in L x 5 in W x 2.5 in D (37cm L x 12.7cm W x 6.36cm D)  \nSquare-7.75 in L x 9 in W x 2.5 in D (19 . 7cm L x 22 .9cm W x 6 .35cm D)  \nD4S/D4P120 Footprint Dimensions: 7.75 in L x 5 in W x 2.5 in D (19 . 7cm L x 12. 7cm W x 6 .35cm D) D4120 Weight: 2.5 pounds; 1.14 kg  \nElectrical  \nPower supply voltage:  \nInput capacitance:  \nReset Voltage:  \nReset Time (with RTS451):  \nReset Time (by power down): Power Up Time:  \nAlarm response time:  \nSensitivity Test:  \n20-29 VDC  \n270 µF max.  \n3.0 VDC min.  \n.03 to 0.3 sec.  \n0.6 sec. max.  \n35 sec. max.  \n15 sec. See detector label  \n24 VAC 50-60-Hz  \n270 µF max.  \n2.0 VAC min.  \n.03 to 0.3 sec.  \n0.6 sec. max.  \n35 sec. max.  \n15 sec. See detector label  \n120 VAC 50-60 Hz N/A  \n10 VAC min.  \n.03 to 0.3 sec.  \n0.6 sec. max.  \n35 sec. max.  \n15 sec. See detector label  \nCurrent Requirements (Using No Accessories)  \nMax. standby current  \nMax. alarm current  \n21 mA @ 24 VDC  \n65 mA @ 24 VDC  \n65 mA RMS @ 24VAC 60Hz  \n135 mA RMS @ 24 VAC 60 Hz  \n20 mA RMS @ 120 VAC 60 Hz  \n35 mA RMS @ 120 VAC 60 Hz  \nCONTACT RATINGS  \n\n| Alarm initiation contacts (SPST) 2.0A @ 30 VDC (resistive) |\n| --- |\n| Alarm auxiliary contatcs (DPDT) 10A @30 VDC (resistive)\u003Cbr>10A @250 VAC (resistive)\u003Cbr>1/2 HP @240 VAC\u003Cbr>1/4 HP @120 VAC |\n| NOTE: Alarm auxiliary contacts shall not be connected to initiating circuits of control panels. Use the alarm initiation contact for this purpose. |\n| Supervisory Contacts (SPDT) 2.0A @ 30 VDC (resistive)\u003Cbr>2.0A @ 125 VAC (resistive) |\n\nTabLe of conTenTS Page  \n\n| ACCESSORY CURRENT LOADS AT 24 VDC |  |  |  |\n| --- | --- | --- | --- |\n| DEVICE | STANDBY | TROUBLE | ALARM |\n| APA151/APA451 | 12.5mA | n/a | 30mA Max. |\n| MHR/MHW | 0mA | n/a | 29mA Max. |\n| RA400Z | 0mA | n/a | 12mA Max. |\n| RTS451 | 0mA | n/a | 12mA Max. |\n| RTS451KEY | 12mA | n/a | 12mA Max. |\n| SSK451 | 8mA Max. | 16mA Max. | 40mA Max. |\n\nNOTE: Any combination of accessories may be used such that the given accessory loads are: 110mA or less at the Aux output, and 50mA or less at the Alarm output.  \n[1] Limitations of Duct Smoke Detectors .......................... 1  \n[2] Exploded View of Duct Smoke Detector Components ............. 2  \n[3] General Description ...................................... 2  \n[4] Contents of Duct Smoke Detector Kit.......................... 2  \n[5] Detector Installation ...................................... 2  \n[6] Sampling Tube Installation ................................. 3  \n[7] Measurement Tests ....................................... 3  \n[8] Field Wiring Installation Guidelines........................... 4  \n[9] Unit Configuration ....................................... 5  \n[10] Detector Status Indication ................................. 6  \n[11] Interconnection (Multiple Fan Shut Down) ..................... 6  \n[12] Verification of Operation .................................. 6  \n[13] Detector Cleaning Procedures .............................. 7  \n[14] Sensor replacement...................................... 7  \n[15] Optional Accessories ..................................... 7  \nWiring Diagrams .......................................... 5-7  \nWarranty ................................................ 8  \nbefore inSTaLLing  \nRead the Syste","cbCaivYazY8SM2V3","https://ap.wps.com/l/cbCaivYazY8SM2V3","pdf",1578230,"English","# Limitations of Duct Smoke Detectors\n# Exploded View of Duct Smoke Detector Components\n# General Description\n# Contents of Duct Smoke Detector Kit\n# Detector Installation\n## Sampling Tube Installation\n## Measurement Tests\n## Field Wiring Installation Guidelines\n## Unit Configuration\n## Detector Status Indication\n## Interconnection (Multiple Fan Shut Down)\n## Verification of Operation\n## Detector Cleaning Procedures\n## Sensor replacement\n## Optional Accessories\n# Wiring Diagrams\n# Warranty","[{\"question\":\"What components make up the D4120 duct detector?\",\"answer\":\"The D4120 duct detector consists of the D4P120 Power Board component and the D4S Sensor component.\"},{\"question\":\"What temperatures and humidity conditions does the detector support?\",\"answer\":\"Operating temperature is specified for D4120 \\u0026 D4S as –4°F to 158°F (–20°C to 70°C) and for D4P120 as –40°F to 158°F (–40°C to 70°C). Storage temperature is also listed for each component, with humidity range of 0% to 95% relative humidity non-condensing.\"},{\"question\":\"Why must duct smoke detectors not be used as substitutes for open-area detector protection?\",\"answer\":\"The document warns that duct detectors must not be used as a substitute for open area detector protection for life safety and are not a substitute for early warning in a building’s regular fire detection system.\"}]","D4120 Duct Smoke Detector - Installation and MainTenance Instructions | PDF",1790329044]