{"product_id":"honeywell-rm7890a1056-7800-series-relay-module","title":"Honeywell RM7890A1056 7800 SERIES Relay Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\u003cp\u003eThe Honeywell RM7890A1056 is a microprocessor-based integrated burner control for automatically fired gas, oil, or combination fuel single-burner applications. As part of the 7800 SERIES, this relay module provides reliable flame supervision, system status indication, and safety sequencing. It is engineered for industrial environments where precise burner management, interlock monitoring, and deterministic startup cycles are essential for operational safety.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMicroprocessor-based design for consistent, repeatable burner sequencing.\u003c\/li\u003e\n\u003cli\u003eIntegrated flame supervision for gas, oil, or combination fuel burners.\u003c\/li\u003e\n\u003cli\u003eSupports intermittent pilot configurations with selectable flame establishing periods (4 or 10 seconds).\u003c\/li\u003e\n\u003cli\u003eEnforces strict interlock logic to prevent hazardous startup conditions.\u003c\/li\u003e\n\u003cli\u003eDesigned for high-reliability operation in electrically noisy industrial settings.\u003c\/li\u003e\n\u003cli\u003eCompatible with the broader Honeywell 7800 SERIES ecosystem, including display modules and purge timers.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cp\u003eThe RM7890A1056 is widely utilized in industrial combustion systems, including:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eIndustrial boilers and steam generators.\u003c\/li\u003e\n\u003cli\u003eRefinery process heaters.\u003c\/li\u003e\n\u003cli\u003eUtility power plant burners.\u003c\/li\u003e\n\u003cli\u003eCommercial and industrial heating systems requiring primary burner control.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eRM7890A1056\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003e7800 SERIES\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Type\u003c\/td\u003e\n\u003ctd\u003eOn-off primary burner control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e120 VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eLess than 10 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuel Compatibility\u003c\/td\u003e\n\u003ctd\u003eGas, oil, coal, or combination\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePilot Type\u003c\/td\u003e\n\u003ctd\u003eIntermittent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlame Establishing Period\u003c\/td\u003e\n\u003ctd\u003e4 or 10 seconds (configurable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEnsure power is disconnected before installing or removing the module from the subbase.\u003c\/li\u003e\n\u003cli\u003eMount the module in a location protected from excessive vibration, moisture, and corrosive atmospheres.\u003c\/li\u003e\n\u003cli\u003eVerify that all field wiring complies with local electrical codes and the specific burner system wiring diagram.\u003c\/li\u003e\n\u003cli\u003eEnsure the chassis is properly grounded to the control cabinet to minimize EMI\/RFI interference.\u003c\/li\u003e\n\u003cli\u003eHandle with care to avoid damage to the connector pins on the rear of the module.\u003c\/li\u003e\n\u003cli\u003eAlways perform a complete functional test of the burner safety sequence after installation or maintenance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch3\u003eIs this module compatible with all 7800 SERIES components?\u003c\/h3\u003e\u003cp\u003eThe RM7890A1056 is designed for the 7800 SERIES architecture; however, compatibility with specific display modules or communication interfaces should be verified against the system wiring diagram and the specific revision of your existing 7800 SERIES hardware.\u003c\/p\u003e\u003ch3\u003eWhat is the primary function of the intermittent pilot configuration?\u003c\/h3\u003e\u003cp\u003eThe intermittent pilot configuration ensures that the pilot flame is ignited and monitored during the startup sequence, providing a reliable ignition source for the main burner before transitioning to the main flame supervision mode.\u003c\/p\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":50910105796860,"sku":"RM7890A1056","price":172.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/wm_1_8a4da408-d11c-45a6-9b18-a901fd980676.jpg?v=1785644090","url":"https:\/\/www.electronicplc.com\/es\/products\/honeywell-rm7890a1056-7800-series-relay-module","provider":"Electronic PLC","version":"1.0","type":"link"}