{"product_id":"st7800a1005-honeywell-burner-control-pre-purge-module","title":"ST7800A1005 Honeywell Burner Control Pre-Purge Module","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe Honeywell ST7800A1005 (ST7800A 1005) is a precision-engineered pre-purge timer card specifically designed for integration with Honeywell’s 7800 Series Flame Safety Relay Modules. This 100% brand new, original component executes a critical 2-second fixed purge cycle, ensuring the evacuation of residual combustible gases from the burner chamber prior to the ignition sequence. By providing a hardware-timed safety interval, the ST7800A1005 protects industrial boilers, furnaces, and commercial kilns from potential flare-backs and explosive ignition events. It acts as a mandatory safety interlock, ensuring the burner system complies with stringent global combustion protocols.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003eThe ST7800A1005 utilizes a rugged plug-in form factor to interface directly with the primary relay module.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eTechnical Detail\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eFunction\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eFixed Pre-Purge Timing\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eTiming Interval\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 Seconds\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHoneywell 7800 Series Relay Modules\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePlug-in with mechanical interlock\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eVibration Resistance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.5 G environment\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCertifications\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUL (MP268), CSA (LR95329-3), FM Approved\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-40 deg C to +60 deg C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eHumidity Tolerance\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e85% RH (Non-condensing)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e500 g\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUSA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cp\u003eThe Honeywell ST7800A1005 solves specific safety and operational challenges in high-stakes combustion environments:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHardware-Level Safety Enforcement:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eUnlike software-based timers that may fail due to code corruption, the ST7800A1005 provides a hardware-fixed 2-second interval. This prevents unauthorized personnel from bypassing or shortening the purge time via a control interface, maintaining the integrity of the safety loop.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRapid Fault Diagnosis:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe mechanical interlock ensures the module stays seated even in high-vibration burner environments. If the system fails to purge, the centralized 7800 Series relay module immediately identifies the missing or faulty timer, simplifying troubleshooting and reducing non-productive downtime.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRegulated Compliance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBearing UL, CSA, and FM marks, this timer allows facilities to meet insurance and local government safety requirements for commercial and industrial burner operations without additional third-party validation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSeamless Field Replacement:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe plug-in architecture allows for instantaneous replacement without disturbing the terminal wiring on the universal subbase. This design facilitates rapid maintenance during scheduled burner inspections.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCan I adjust the timing interval of the ST7800A1005 in the field?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The ST7800A1005 features a fixed 2-second timing interval to prevent tampering and ensure consistent safety performance. If your application requires a longer purge time, you must select the corresponding ST7800 series model (e.g., 30-second or 60-second variants).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIs the ST7800A1005 compatible with all 7800 Series Relay Modules?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module is compatible with most 7800 Series Flame Safety Relay Modules that require a plug-in purge timer. Always consult your specific relay module's technical manual to verify the required purge duration for your burner's volume.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWhat happens if the timer is removed while the burner is running?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe mechanical interlock secures the module; however, if the purge timer circuit is broken, the 7800 Series relay module will initiate a safety shutdown or prevent a restart to protect the system from unpurged gas accumulation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this unit require separate calibration?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe ST7800A1005 comes factory-calibrated and tested. No field calibration or adjustment is necessary or possible, ensuring \"out-of-the-box\" reliability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":43810858172515,"sku":"ST7800A1005","price":320.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0583\/5246\/8067\/files\/26_58032850-1840-499e-a953-6a4537181247.jpg?v=1776414067","url":"https:\/\/www.autocontrolglobal.com\/ms\/products\/st7800a1005-honeywell-burner-control-pre-purge-module","provider":"AutoControl Global","version":"1.0","type":"link"}