{"product_id":"honeywell-rm7890b1014-7800-series-relay-module","title":"Honeywell RM7890B1014 7800 Series Relay Module","description":"\u003cp\u003eThe \u003cstrong\u003eHoneywell RM7890B1014\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eRM7890B\u003c\/strong\u003e Relay Module, operates as a dedicated hardware component for automatic burner sequencing and flame monitoring within 7800 Series burner control platforms.\u003c\/p\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\u003eRM7890B1014\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.85 lbs (0.84 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard 7800 Series plug-in module footprint\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\u003e120 VAC (+10%, -15%), 50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Platform\u003c\/td\u003e\n\u003ctd\u003e7800 Series Burner Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIgnition Type\u003c\/td\u003e\n\u003ctd\u003eIntermittent pilot\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlame Establishing Period\u003c\/td\u003e\n\u003ctd\u003e4-second or 10-second selectable pilot flame establishing period\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal Protocol\u003c\/td\u003e\n\u003ctd\u003e4-20 mA HART loop protocol compatibility via external gateway interface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Execution \u0026amp; Loop Monitoring\u003c\/h3\u003e\n\u003cp\u003eThe RM7890B1014 module executes dynamic flame signal evaluation and automated valve sequencing via integrated microsecond logic circuits. Channel-to-channel isolation safeguards internal microprocessor paths against line spikes, while supporting external analog instrumentation through standard 4-20 mA HART loop protocol adapters. Cold junction compensation (CJC) algorithms ensure high-precision thermal monitoring when tied into plant-wide industrial burner loop circuits.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the RM7890B1014 module be inserted or removed while line power is active?\u003c\/p\u003e\n\u003cp\u003eA: No, main operating voltage must be disconnected prior to inserting or removing the relay module from its subbase to prevent damage to internal contacts and solid-state components.\u003c\/p\u003e\n\u003cp\u003eQ: How is the pilot flame establishing period configured on the hardware?\u003c\/p\u003e\n\u003cp\u003eA: The timing cycle (4 seconds or 10 seconds) is determined by the specific model wiring and internal jumper connections configured on the 7800 Series subbase.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eMount the module subbase securely inside a grounded metal cabinet away from high-vibration equipment.\u003c\/li\u003e\n\u003cli\u003eRoute high-voltage ignition transformer leads in separate metallic conduits away from low-voltage flame sensor cabling to avoid induced electromagnetic noise.\u003c\/li\u003e\n\u003cli\u003eEnsure a direct low-impedance connection from the subbase grounding terminal to functional earth (FE).\u003c\/li\u003e\n\u003cli\u003eVerify that the incoming supply line delivers a stable 120 VAC nominal input (+10%, -15%) at 50 Hz or 60 Hz before energizing the module.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":45396608548979,"sku":"RM7890B1014","price":233.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/RM7898A1000_f522787a-8d8c-47df-9fac-8c9bec6d220f.png?v=1787638384","url":"https:\/\/www.dcssupplier.com\/products\/honeywell-rm7890b1014-7800-series-relay-module","provider":"DcsSupplier Limited","version":"1.0","type":"link"}