{"product_id":"honeywell-rm7888a1027-7800-series-relay-module","title":"Honeywell RM7888A1027 7800 Series Relay Module","description":"\u003cp\u003eConfigured for primary flame safeguard execution in heavy industrial HVAC combustion networks, the \u003cstrong\u003eHoneywell RM7888A1027\u003c\/strong\u003e (\u003cstrong\u003eRM7888\u003c\/strong\u003e Burner Control Unit) provides direct physical\/electrical execution. Operating on a 120 VAC, 50\/60 Hz supply, this microprocessor-based relay module provides selectable pilot operation, a 10 second pilot flame establishing period, and a 15 second main flame establishing period across 7800 Series 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\u003eRM7888A1027\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\u003e3.00 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard 7800 Series Subbase Form Factor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to 60 deg C (Standard Industrial Profile)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003eStandard 120 VAC Base Load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e120 VAC (50\/60 Hz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePilot Type\u003c\/td\u003e\n\u003ctd\u003eSelectable Pilot Type\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePilot Flame Period\u003c\/td\u003e\n\u003ctd\u003e10 Seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMain Flame Period\u003c\/td\u003e\n\u003ctd\u003e15 Seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Type\u003c\/td\u003e\n\u003ctd\u003eWiring Subbase Panel Mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003e4-20 mA HART Loop Protocol and Channel Isolation\u003c\/h3\u003e\n\u003cp\u003eThe RM7888A1027 utilizes internal signal filtering and channel-to-channel isolation principles to shield microampere flame sensor pathways from backplane electrical noise and high-voltage transient spikes. By decoupling flame signal evaluation circuits from line-voltage switching relays and internal power buses, the module prevents ground loop current shifts and suppresses electromagnetic noise generated by ignition transformers. This solid-state isolation scheme ensures deterministic sequence control, continuous flame signal validation, and accurate safety lockout execution throughout active firing cycles.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How is the pilot type configured on the RM7888A1027 relay module?\u003c\/p\u003e\n\u003cp\u003eA: The pilot operational mode (such as interrupted vs. intermittent pilot) is configured via selectable jumper settings or dip-switch positioning on the module circuit board prior to subbase installation and system power-up.\u003c\/p\u003e\n\u003cp\u003eQ: What sequence timing governs the main burner ignition phase on this module?\u003c\/p\u003e\n\u003cp\u003eA: Following successful pilot flame detection during the 10 second pilot flame establishing period, the module initiates a fixed 15 second main flame establishing period to prove main burner ignition before proving the main firing state.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSecure the standard 7800 Series wiring subbase to a flat panel inside the burner enclosure, ensuring no mechanical distortion affects pin terminal alignment upon module insertion.\u003c\/li\u003e\n\u003cli\u003eRoute low-voltage flame scanner cabling through dedicated grounded metal conduits, keeping them separate from 120 VAC supply lines and high-voltage ignition leads.\u003c\/li\u003e\n\u003cli\u003eConnect the primary chassis earth conductor directly to the subbase grounding lug using a low-impedance copper wire to avoid floating ground conditions.\u003c\/li\u003e\n\u003cli\u003eTorque all subbase electrical terminal screws to standard industrial ratings (8 to 10 in-lbs) to maintain gas-tight contact across all active circuits.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":48791328293054,"sku":"RM7888A1027","price":172.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/RM7888A1027_2.png?v=1787814410","url":"https:\/\/www.autooiltech.com\/products\/honeywell-rm7888a1027-7800-series-relay-module","provider":"AutoOilTech Limited","version":"1.0","type":"link"}