{"product_id":"honeywell-rm7890a1015-burner-control-relay-module","title":"Honeywell RM7890A1015 Burner Control Relay Module","description":"\u003cp\u003eThe \u003cstrong\u003eHoneywell RM7890A1015\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eRM7890A1015\u003c\/strong\u003e Burner Control Unit, operates as a dedicated hardware component for on-off primary control and flame sequence execution within 7800 SERIES combustion platforms. It mounts directly onto a wiring subbase to supervise intermittent pilot ignition, nonvolatile memory status storage, five-LED diagnostic sequencing, and 120 VAC fuel shutoff valve circuits across single-burner gas or oil applications.\u003c\/p\u003e\n\u003ch3\u003eSuffix Breakdown \u0026amp; Model Matrix\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRM7890A1015\u003c\/strong\u003e: Current production primary relay module equipped with nonvolatile memory and five diagnostic status LEDs (Direct replacement for \u003cstrong\u003eRM7890A1007\u003c\/strong\u003e).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRM7890A1007\u003c\/strong\u003e: Legacy base release (Discontinued by manufacturer, superseded by \u003cstrong\u003eRM7890A1015\u003c\/strong\u003e).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eRM7890A1015\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUSA \/ Mexico\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e2.40 lbs (1.09 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e127 mm x 127 mm x 133 mm (with Q7800 subbase)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 deg C to +60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e10 W nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e120 VAC (+10%, -15%), 50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatus Display\u003c\/td\u003e\n\u003ctd\u003e5 Diagnostic LEDs (Power, Pilot, Flame, Main, Alarm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePilot Flame Establishing Period\u003c\/td\u003e\n\u003ctd\u003eSelectable 4 s or 10 s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMemory Type\u003c\/td\u003e\n\u003ctd\u003eNonvolatile Memory\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Control and DCS Interface Features\u003c\/h3\u003e\n\u003cp\u003eThe unit relies on internal channel-to-channel isolation to decouple low-voltage micro-ampere flame detection circuits from 120 VAC heavy-duty output relays. Operational sequence timing, real-time flame signal voltage, and historical diagnostic lockout metrics pass through the integrated serial ControlBus connection, enabling direct integration into plant DCS networks and PLC automation architectures without degrading safety interlock loop integrity.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Does the RM7890A1015 directly replace the older RM7890A1007 relay module?\u003c\/p\u003e\n\u003cp\u003eA: Yes, the RM7890A1015 is the direct functional and mechanical replacement for the legacy RM7890A1007 module, mating directly with existing Q7800 subbases.\u003c\/p\u003e\n\u003cp\u003eQ: Is an external ST7800 purge card required for the RM7890A1015 to operate?\u003c\/p\u003e\n\u003cp\u003eA: No, the RM7890A1015 functions as an on-off primary control without a purge timing requirement, though it still requires a plug-in flame signal amplifier and Q7800 subbase.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect and lock out all 120 VAC power supplies feeding the Q7800 subbase prior to installing or removing the module.\u003c\/li\u003e\n\u003cli\u003eVerify subbase card-edge connector terminals are clean and straight to ensure proper electrical pin alignment.\u003c\/li\u003e\n\u003cli\u003eSeat the module firmly onto the subbase receptacle and tighten the central captive retaining screws to resist industrial vibration.\u003c\/li\u003e\n\u003cli\u003eMaintain physical separation of at least 150 mm between low-voltage flame sensor lines, serial ControlBus wiring, and high-voltage ignition transformer leads.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":45396613628019,"sku":"RM7890A1015","price":233.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/RM7898A1000_87b8ccff-6635-405b-a4d4-1f8f100d90f6.png?v=1787623839","url":"https:\/\/www.dcssupplier.com\/ar\/products\/honeywell-rm7890a1015-burner-control-relay-module","provider":"DcsSupplier Limited","version":"1.0","type":"link"}