{"title":"Pyro-Chem Monarch Control Heads","description":"","products":[{"product_id":"nmch-control-head-no-local-actuation-mechanical","title":"Pyro-Chem NMCH Control Head 551203","description":"\u003cbody\u003e\n\n\n\u003cmeta charset=\"UTF-8\"\u003e\n\u003cmeta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\"\u003e\n\u003ctitle\u003ePyro-Chem NMCH Control Head | Part No. 551203 | Kitchen Knight II \u0026amp; Monarch Series\u003c\/title\u003e\n\u003cstyle\u003e\n  .product-section {\n    max-width: 100%;\n    margin: 2rem 0;\n    font-family: Arial, sans-serif;\n    color: #333;\n  }\n  .accordion-item {\n    border-bottom: 1px solid #ddd;\n  }\n  .accordion-header {\n    display: flex;\n    justify-content: space-between;\n    padding: 2rem 0;\n    cursor: pointer;\n    background: none;\n    border: none;\n    width: 100%;\n    text-align: left;\n    color: #333;\n  }\n  .accordion-header:hover,\n  .accordion-header:focus {\n    color: #333;\n    background: none;\n    outline: none;\n  }\n  .accordion-title {\n    font-size: 1.5rem;\n    font-weight: 500;\n  }\n  .accordion-icon {\n    font-size: 1.5rem;\n  }\n  .accordion-item.active .accordion-icon {\n    transform: rotate(180deg);\n  }\n  .accordion-content {\n    max-height: 0;\n    overflow: hidden;\n  }\n  .accordion-item.active .accordion-content {\n    max-height: none;\n  }\n  .accordion-content-inner {\n    font-size: 1.4rem;\n    line-height: 1.7;\n    color: #555;\n    padding-bottom: 2rem;\n  }\n  .accordion-content-inner p {\n    margin: 0 0 1rem 0;\n  }\n  .accordion-content-inner ul {\n    margin: 0 0 1rem 0;\n    padding-left: 2rem;\n  }\n  .accordion-content-inner h3 {\n    font-size: 1.4rem;\n    font-weight: 600;\n    color: #333;\n    margin: 1.5rem 0 0.5rem 0;\n  }\n  .specs-table {\n    width: 100%;\n    border-collapse: collapse;\n  }\n  .specs-table th,\n  .specs-table td {\n    border: 1px solid #ddd;\n    padding: 0.75rem 1rem;\n    font-size: 1.4rem;\n    text-align: left;\n  }\n  .specs-table th {\n    background-color: #f5f5f5;\n    font-weight: 600;\n    color: #333;\n  }\n\u003c\/style\u003e\n\n\n\n\u003cdiv class=\"product-section\"\u003e\n\n  \u003c!-- Section 1: Product Overview --\u003e\n  \u003cdiv class=\"accordion-item\"\u003e\n    \u003cbutton class=\"accordion-header\"\u003e\n      \u003cspan class=\"accordion-title\"\u003eProduct Overview\u003c\/span\u003e\n      \u003cspan class=\"accordion-icon\"\u003e⌄\u003c\/span\u003e\n    \u003c\/button\u003e\n    \u003cdiv class=\"accordion-content\"\u003e\n      \u003cdiv class=\"accordion-content-inner\"\u003e\n        \u003cp\u003eThe Pyro-Chem NMCH Control Head (551203) is a high-precision mechanical command module engineered for the Kitchen Knight II (Wet Chemical) and Monarch series (Dry Chemical) fire suppression systems. In the complex safety architecture of an industrial kitchen or paint spray booth, the control head acts as the decision engine. It is responsible for monitoring thermal detection lines, processing manual overrides, and executing a synchronized discharge of extinguishing agents and utility shut-offs.\u003c\/p\u003e\n        \u003cp\u003eThe NMCH (Non-Manual Control Head) designation is a critical engineering distinction. Unlike standard models, the 551203 is designed for installations where local manual actuation at the cylinder is either physically inaccessible or prohibited by safety protocols. By relying exclusively on remote manual pull stations, the NMCH allows for a streamlined, tamper-resistant remote logic installation. For fire protection stakeholders, the 551203 is the definitive choice for centralized, multi-cylinder scalability in high-volume environments.\u003c\/p\u003e\n\n        \u003ch3\u003eTension-Release Principle\u003c\/h3\u003e\n        \u003cp\u003eThe NMCH operates on a mechanical equilibrium. A continuous loop of stainless steel cable, held under precise tension by fusible links, keeps the internal spring-loaded firing pin in a cocked position. When a link melts or a remote pull station is activated, the tension drops instantly. The resulting kinetic energy ensures a high firing pin strike force against the activation cartridge.\u003c\/p\u003e\n\n        \u003ch3\u003ePneumatic Pulse Hydraulics\u003c\/h3\u003e\n        \u003cp\u003eUpon puncture, the 16-gram CO2 cartridge releases a concentrated burst of gas into the actuation manifold. This pneumatic pulse travels through the actuation piping to the system valve actuators (SVA) on each agent cylinder. The NMCH is engineered to manage the volume required to actuate up to five cylinders simultaneously, ensuring a uniform discharge across the largest cooking lines.\u003c\/p\u003e\n\n        \u003ch3\u003eSequential Utility Interlock\u003c\/h3\u003e\n        \u003cp\u003eThe 551203 is designed with internal cam interfaces that allow for the simultaneous execution of auxiliary functions. As the firing pin drops, the mechanical rotation of the cam trips a mechanical gas valve and toggles auxiliary microswitches, ensuring that the fuel source is severed and exhaust fans are managed at the exact millisecond the suppression agent begins to flow.\u003c\/p\u003e\n\n        \u003ch3\u003eMulti-Cylinder Scalability\u003c\/h3\u003e\n        \u003cp\u003eIn large-scale operations like hospital cafeterias, a single agent tank is rarely sufficient. The 551203 allows for a modular bank of up to five tanks to be controlled by a single head. This reduces the number of failure points and simplifies the semi-annual inspection process.\u003c\/p\u003e\n\n        \u003ch3\u003eTamper-Resistant Remote Logic\u003c\/h3\u003e\n        \u003cp\u003eIn public-access areas or high-traffic industrial zones, having a manual pull handle directly on the cylinder can lead to accidental discharges. The NMCH moves the manual interface to remote pull stations located along the path of egress, ensuring the system is only triggered by personnel safely exiting the hazard zone.\u003c\/p\u003e\n\n        \u003ch3\u003eListed System Integrity\u003c\/h3\u003e\n        \u003cp\u003eEvery component is part of a tested and approved safety envelope. The 551203 is the exact control head used during rigorous UL testing. Utilizing this OEM part protects the owner from insurance-related liability and fire marshal red-tags.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Section 2: Applications \u0026 Use Cases --\u003e\n  \u003cdiv class=\"accordion-item\"\u003e\n    \u003cbutton class=\"accordion-header\"\u003e\n      \u003cspan class=\"accordion-title\"\u003eApplications \u0026amp; Use Cases\u003c\/span\u003e\n      \u003cspan class=\"accordion-icon\"\u003e⌄\u003c\/span\u003e\n    \u003c\/button\u003e\n    \u003cdiv class=\"accordion-content\"\u003e\n      \u003cdiv class=\"accordion-content-inner\"\u003e\n        \u003cul\u003e\n          \u003cli\u003e\n\u003cstrong\u003eIndustrial Paint Spray Booths:\u003c\/strong\u003e Integrated with the Monarch system to protect plenums, ducts, and open-front work areas.\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eLarge-Scale Institutional Kitchens:\u003c\/strong\u003e Providing the massive 5-tank capacity required for stadium concessions and hospital cook lines.\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eRemote Mechanical Rooms:\u003c\/strong\u003e Where agent cylinders are stored away from the kitchen hood, necessitating a remote-only manual trigger.\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eHazmat Storage Locker Protection:\u003c\/strong\u003e Providing a rugged, mechanical fail-safe for lockers containing flammable liquids or chemicals.\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eRetrofit Modernization:\u003c\/strong\u003e Replacing aged or non-compliant control units during 12-year overhauls to restore factory reliability.\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Section 3: Technical Specifications --\u003e\n  \u003cdiv class=\"accordion-item\"\u003e\n    \u003cbutton class=\"accordion-header\"\u003e\n      \u003cspan class=\"accordion-title\"\u003eTechnical Specifications\u003c\/span\u003e\n      \u003cspan class=\"accordion-icon\"\u003e⌄\u003c\/span\u003e\n    \u003c\/button\u003e\n    \u003cdiv class=\"accordion-content\"\u003e\n      \u003cdiv class=\"accordion-content-inner\"\u003e\n        \u003ctable class=\"specs-table\"\u003e\n          \u003cthead\u003e\n            \u003ctr\u003e\n              \u003cth\u003eFeature\u003c\/th\u003e\n              \u003cth\u003eDetails\u003c\/th\u003e\n            \u003c\/tr\u003e\n          \u003c\/thead\u003e\n          \u003ctbody\u003e\n            \u003ctr\u003e\n              \u003ctd\u003eManufacturer\u003c\/td\u003e\n              \u003ctd\u003ePyro-Chem (A Johnson Controls Brand)\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n              \u003ctd\u003ePart Number\u003c\/td\u003e\n              \u003ctd\u003e551203 (Model NMCH)\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n              \u003ctd\u003eSystem Compatibility\u003c\/td\u003e\n              \u003ctd\u003eKitchen Knight II \/ Monarch Series\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n              \u003ctd\u003eActuation Capacity\u003c\/td\u003e\n              \u003ctd\u003e1 to 5 Agent Cylinders (Simultaneous)\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n              \u003ctd\u003ePropellant Source\u003c\/td\u003e\n              \u003ctd\u003e16-Gram CO2 Cartridge\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n              \u003ctd\u003eDetection Interface\u003c\/td\u003e\n              \u003ctd\u003eTension-Release Principle (1\/16\" SS Cable)\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n              \u003ctd\u003eMax Cable Run\u003c\/td\u003e\n              \u003ctd\u003e150 Feet (45.7 m)\u003c\/td\u003e\n            \u003c\/tr\u003e\n            \u003ctr\u003e\n              \u003ctd\u003eCompliance\u003c\/td\u003e\n              \u003ctd\u003eUL Listed, ULC Listed, Meets NFPA 17\/17A\/96\u003c\/td\u003e\n            \u003c\/tr\u003e\n          \u003c\/tbody\u003e\n        \u003c\/table\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Section 4: Installation \u0026 Compliance --\u003e\n  \u003cdiv class=\"accordion-item\"\u003e\n    \u003cbutton class=\"accordion-header\"\u003e\n      \u003cspan class=\"accordion-title\"\u003eInstallation \u0026amp; Compliance\u003c\/span\u003e\n      \u003cspan class=\"accordion-icon\"\u003e⌄\u003c\/span\u003e\n    \u003c\/button\u003e\n    \u003cdiv class=\"accordion-content\"\u003e\n      \u003cdiv class=\"accordion-content-inner\"\u003e\n        \u003ch3\u003eAxial Alignment and Tension Calibration\u003c\/h3\u003e\n        \u003cp\u003eDuring installation, the detection line must be tensioned to exact specifications. Over-tensioning can lead to nuisance trips, while under-tensioning can cause the firing pin to strike with insufficient force.\u003c\/p\u003e\n\n        \u003ch3\u003eSemi-Annual Functional Audit\u003c\/h3\u003e\n        \u003cp\u003eEvery 6 months, a technician must perform a silent trip of the NMCH. This involves removing the CO2 cartridge and triggering the system via a remote pull station to ensure all internal cams and microswitches toggle correctly.\u003c\/p\u003e\n\n        \u003ch3\u003eFactory-Stamped Weight Verification\u003c\/h3\u003e\n        \u003cp\u003eThe 16-gram activation cartridge must be weighed during every inspection. If the weight has deviated by more than 0.5g from the factory-stamped weight, it must be replaced immediately to ensure the pneumatic pulse remains powerful enough.\u003c\/p\u003e\n\n        \u003ch3\u003eMounting Integrity Protocol\u003c\/h3\u003e\n        \u003cp\u003eBecause the NMCH manages detection line tension, it must be mounted to a rigid structural member. Any flex in the mounting surface can lead to a loss of cable tension over time.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Section 5: FAQ --\u003e\n  \u003cdiv class=\"accordion-item\"\u003e\n    \u003cbutton class=\"accordion-header\"\u003e\n      \u003cspan class=\"accordion-title\"\u003eFAQ\u003c\/span\u003e\n      \u003cspan class=\"accordion-icon\"\u003e⌄\u003c\/span\u003e\n    \u003c\/button\u003e\n    \u003cdiv class=\"accordion-content\"\u003e\n      \u003cdiv class=\"accordion-content-inner\"\u003e\n        \u003ch3\u003eWhat is the difference between NMCH and MCH?\u003c\/h3\u003e\n        \u003cp\u003eThe MCH (Manual Control Head) features a local pull handle directly on the unit. The NMCH (Non-Manual) lacks this handle and is intended for systems where manual activation happens exclusively at remote pull stations.\u003c\/p\u003e\n\n        \u003ch3\u003eCan I use the 551203 with an Ansul R-102 cylinder?\u003c\/h3\u003e\n        \u003cp\u003eNo. While both brands are owned by Johnson Controls, the 551203 is specifically listed for Pyro-Chem hardware. Mixing brands is a major code violation and will void the UL listing and insurance coverage.\u003c\/p\u003e\n\n        \u003ch3\u003eHow many microswitches can I install in the NMCH?\u003c\/h3\u003e\n        \u003cp\u003eThe NMCH is designed to accommodate up to two auxiliary microswitches (SPDT or DPDT). These are used to shut down power to appliances, exhaust fans, or to send an alarm signal to the building's main fire panel.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript\u003e\ndocument.addEventListener('DOMContentLoaded', function() {\n  const headers = document.querySelectorAll('.accordion-header');\n  headers.forEach(header =\u003e {\n    header.addEventListener('click', function() {\n      this.parentElement.classList.toggle('active');\n    });\n  });\n});\n\u003c\/script\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\/\",\n  \"@type\": \"Product\",\n  \"name\": \"Pyro-Chem NMCH Control Head\",\n  \"description\": \"UL Listed Non-Manual Control Head for Pyro-Chem Kitchen Knight II and Monarch fire suppression systems. Actuates 1 to 5 agent cylinders simultaneously via 16-gram CO2 cartridge. Tension-release detection via 1\/16 inch stainless steel cable up to 150 feet. Remote-only actuation with up to 2 auxiliary microswitches. Meets NFPA 17, 17A, and 96.\",\n  \"sku\": \"551203\",\n  \"mpn\": \"551203\",\n  \"brand\": {\n    \"@type\": \"Brand\",\n    \"name\": \"Pyro-Chem\"\n  },\n  \"manufacturer\": {\n    \"@type\": \"Organization\",\n    \"name\": \"Pyro-Chem (A Johnson Controls Brand)\"\n  },\n  \"category\": \"Fire Suppression Equipment\",\n  \"additionalProperty\": [\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Part Number\",\n      \"value\": \"551203 (Model NMCH)\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"System Compatibility\",\n      \"value\": \"Kitchen Knight II \/ Monarch Series\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Actuation Capacity\",\n      \"value\": \"1 to 5 Agent Cylinders (Simultaneous)\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Propellant Source\",\n      \"value\": \"16-Gram CO2 Cartridge\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Detection Interface\",\n      \"value\": \"Tension-Release Principle (1\/16 inch SS Cable)\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Max Cable Run\",\n      \"value\": \"150 Feet (45.7 m)\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Compliance\",\n      \"value\": \"UL Listed, ULC Listed, Meets NFPA 17\/17A\/96\"\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\n\u003c\/body\u003e","brand":"PyroChem","offers":[{"title":"Default Title","offer_id":45907804291237,"sku":"551203","price":599.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0672\/5605\/8021\/files\/pyrochem-default-title-pyro-chem-nmch-control-head-551203-33278405968037_33216b5d-5e3e-41bd-9aed-e811e919747f.webp?v=1771286810"},{"product_id":"pyrochem-nmch-dpt-control-head-551204","title":"Pyro-Chem NMCH DPT Control Head - 551204","description":"\u003cbody\u003e\n\n\n\u003cmeta charset=\"UTF-8\"\u003e\n\u003cmeta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\"\u003e\n\u003ctitle\u003ePyro-Chem NMCH DPT Control Head | Part No. 551204\u003c\/title\u003e\n\u003cstyle\u003e\n  .product-section { max-width: 100%; margin: 2rem 0; font-family: Arial, sans-serif; color: #333; }\n  .accordion-item { border-bottom: 1px solid #ddd; }\n  .accordion-header { display: flex; justify-content: space-between; padding: 2rem 0; cursor: pointer; background: none; border: none; width: 100%; text-align: left; color: #333; }\n  .accordion-header:hover, .accordion-header:focus { color: #333; background: none; outline: none; }\n  .accordion-title { font-size: 1.5rem; font-weight: 500; }\n  .accordion-icon { font-size: 1.5rem; }\n  .accordion-item.active .accordion-icon { transform: rotate(180deg); }\n  .accordion-content { max-height: 0; overflow: hidden; }\n  .accordion-item.active .accordion-content { max-height: none; }\n  .accordion-content-inner { font-size: 1.4rem; line-height: 1.7; color: #555; padding-bottom: 2rem; }\n  .accordion-content-inner p { margin: 0 0 1rem 0; }\n  .accordion-content-inner ul { margin: 0 0 1rem 0; padding-left: 2rem; }\n  .accordion-content-inner h3 { font-size: 1.4rem; font-weight: 600; color: #333; margin: 1.5rem 0 0.5rem 0; }\n  .specs-table { width: 100%; border-collapse: collapse; }\n  .specs-table th, .specs-table td { border: 1px solid #ddd; padding: 0.75rem 1rem; font-size: 1.4rem; text-align: left; }\n  .specs-table th { background-color: #f5f5f5; font-weight: 600; color: #333; }\n\u003c\/style\u003e\n\n\n\u003cdiv class=\"product-section\"\u003e\n\n  \u003cdiv class=\"accordion-item\"\u003e\n    \u003cbutton class=\"accordion-header\"\u003e\u003cspan class=\"accordion-title\"\u003eProduct Overview\u003c\/span\u003e\u003cspan class=\"accordion-icon\"\u003e⌄\u003c\/span\u003e\u003c\/button\u003e\n    \u003cdiv class=\"accordion-content\"\u003e\u003cdiv class=\"accordion-content-inner\"\u003e\n      \u003cp\u003eThe Pyro-Chem NMCH DPT Control Head (P\/N 551204) is the manual and automatic release control head for Pyro-Chem Kitchen Knight II and compatible wet chemical fire suppression systems. The \"DPT\" designation refers to its dual-purpose trip capability — allowing the system to be actuated either automatically via the thermal detection line or manually via a remote pull station, making it one of the most versatile control heads in the Pyro-Chem fire suppression system lineup.\u003c\/p\u003e\n      \u003cp\u003eThe control head is the mechanical brain of the suppression system. It houses the spring-loaded release mechanism that, when triggered by a fusible link separation or a manual pull station activation, releases the nitrogen actuation pressure to discharge the wet chemical agent through the nozzle manifold. The NMCH3 designation used in some documentation refers to the same platform — technicians searching for nmch3 control head wiring diagram information will find the 551204 is the applicable unit.\u003c\/p\u003e\n      \u003cp\u003eFor fire protection contractors servicing Pyro-Chem kitchen fire suppression systems, the 551204 control head is a critical fire suppression supply stocking item. A faulty or worn control head is one of the most common reasons a system fails its semi-annual NFPA 17A and NFPA 96 functional test. Keeping a replacement unit in your fire suppression system parts inventory ensures rapid turnaround for commercial kitchen fire suppression system clients without extended downtime.\u003c\/p\u003e\n    \u003c\/div\u003e\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"accordion-item\"\u003e\n    \u003cbutton class=\"accordion-header\"\u003e\u003cspan class=\"accordion-title\"\u003eTechnical Specifications\u003c\/span\u003e\u003cspan class=\"accordion-icon\"\u003e⌄\u003c\/span\u003e\u003c\/button\u003e\n    \u003cdiv class=\"accordion-content\"\u003e\u003cdiv class=\"accordion-content-inner\"\u003e\n      \u003ctable class=\"specs-table\"\u003e\n        \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n        \u003ctbody\u003e\n          \u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003ePyro-Chem (A Johnson Controls Brand)\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e551204\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eControl Head Type\u003c\/td\u003e\n\u003ctd\u003eNMCH DPT (Dual-Purpose Trip)\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eActuation Type\u003c\/td\u003e\n\u003ctd\u003eManual and automatic (detection line)\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eSystem Compatibility\u003c\/td\u003e\n\u003ctd\u003ePyro-Chem Kitchen Knight II and compatible systems\u003c\/td\u003e\n\u003c\/tr\u003e\n          \u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eUL 300 Listed, NFPA 17A, NFPA 96\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003c\/tbody\u003e\n      \u003c\/table\u003e\n    \u003c\/div\u003e\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"accordion-item\"\u003e\n    \u003cbutton class=\"accordion-header\"\u003e\u003cspan class=\"accordion-title\"\u003eInstallation \u0026amp; Compliance (NFPA 17A \u0026amp; 96)\u003c\/span\u003e\u003cspan class=\"accordion-icon\"\u003e⌄\u003c\/span\u003e\u003c\/button\u003e\n    \u003cdiv class=\"accordion-content\"\u003e\u003cdiv class=\"accordion-content-inner\"\u003e\n      \u003ch3\u003eSemi-Annual Functional Test\u003c\/h3\u003e\n      \u003cp\u003eUnder NFPA 17A and NFPA 96, the control head must be functionally tested at every semi-annual inspection. This involves simulating a detection line trip and verifying the mechanical release mechanism cycles completely. Any sluggishness, binding, or failure to fully cycle is an immediate red-tag deficiency requiring control head replacement. Document the test results on the fire suppression system inspection record.\u003c\/p\u003e\n      \u003ch3\u003eCocking and Arming Protocol\u003c\/h3\u003e\n      \u003cp\u003eAfter service or testing, the 551204 must be re-cocked and armed per the Pyro-Chem kitchen knight fire suppression system manual. Verify the detection line tension is within specification before arming. An improperly armed control head is the leading cause of nuisance trips and failed actuations in kitchen fire suppression system components.\u003c\/p\u003e\n      \u003ch3\u003eMicroswitch and Electrical Connections\u003c\/h3\u003e\n      \u003cp\u003eThe 551204 includes internal microswitches for gas valve actuation and alarm signaling. Verify all electrical connections are secure and the wiring matches the nmch3 control head wiring diagram for your installation. Loose or corroded connections are a common source of false alarms and system communication failures.\u003c\/p\u003e\n    \u003c\/div\u003e\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"accordion-item\"\u003e\n    \u003cbutton class=\"accordion-header\"\u003e\u003cspan class=\"accordion-title\"\u003eFAQ\u003c\/span\u003e\u003cspan class=\"accordion-icon\"\u003e⌄\u003c\/span\u003e\u003c\/button\u003e\n    \u003cdiv class=\"accordion-content\"\u003e\u003cdiv class=\"accordion-content-inner\"\u003e\n      \u003ch3\u003eIs the 551204 compatible with the Pyro-Chem PCL-350 system?\u003c\/h3\u003e\n      \u003cp\u003eThe 551204 NMCH DPT control head is specifically listed for Pyro-Chem Kitchen Knight II systems. Compatibility with other Pyro-Chem platforms including the PCL-350 should be verified against the pyro chem kitchen knight manual and system as-built drawings before installation. Using an unlisted control head voids the UL 300 certification of the system.\u003c\/p\u003e\n      \u003ch3\u003eWhat does \"DPT\" mean on the control head?\u003c\/h3\u003e\n      \u003cp\u003eDPT stands for Dual-Purpose Trip — meaning the control head can be actuated by either the automatic thermal detection line (fusible link separation) or by a manual remote pull station. This dual actuation capability is required for most commercial kitchen fire suppression system installations under NFPA 96.\u003c\/p\u003e\n      \u003ch3\u003eCan I reset the control head after a discharge without replacing components?\u003c\/h3\u003e\n      \u003cp\u003eAfter a full system discharge, the control head must be inspected for internal component damage before re-arming. The Pyro-Chem pyro chem fire suppression system manual provides the reset procedure. Any component showing damage, corrosion, or wear after a discharge should be replaced with OEM fire suppression system parts before returning the system to service.\u003c\/p\u003e\n    \u003c\/div\u003e\u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003cscript\u003e\ndocument.addEventListener('DOMContentLoaded', function() {\n  document.querySelectorAll('.accordion-header').forEach(h =\u003e h.addEventListener('click', function() { this.parentElement.classList.toggle('active'); }));\n});\n\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\/\",\n  \"@type\": \"Product\",\n  \"name\": \"Pyro-Chem NMCH DPT Control Head | Part No. 551204\",\n  \"description\": \"UL 300 Listed dual-purpose trip (DPT) control head for Pyro-Chem Kitchen Knight II wet chemical fire suppression systems. Manual and automatic actuation via detection line or remote pull station. Includes internal microswitches for gas valve and alarm signaling. Semi-annual functional test required per NFPA 17A and NFPA 96. Refer to NMCH3 wiring diagram for electrical connections. 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