{"product_id":"honeywell-rm7840l1026-relay-module","title":"Honeywell RM7840L1026 Relay Module","description":"\u003cp\u003eThe \u003cstrong\u003eHoneywell RM7840L1026\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eRM7840L1026\u003c\/strong\u003e Burner Control Relay Module, operates as a dedicated hardware component for automatic burner sequencing and safety shutoff execution 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\u003eRM7840L1026\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\u003eUnited States\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 Relay Module Footprint\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\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 logic supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIgnition Type\u003c\/td\u003e\n\u003ctd\u003eInterrupted pilot type\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePilot \u0026amp; Timing\u003c\/td\u003e\n\u003ctd\u003eIntermittent 2nd stage pilot valve, 5s early spark termination, 15s post purge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConfigurable Features\u003c\/td\u003e\n\u003ctd\u003eUser selectable airflow check, pre-ignition interlock monitoring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eChannel-to-Channel Isolation and Loop Protocol Dynamics\u003c\/h3\u003e\n\u003cp\u003eConfigured for precise combustion control, the module uses integrated solid-state logic to enforce critical pre-ignition purge, pilot ignition timing, and fixed 15-second post-purge cycles. Internal optocoupled isolation networks separate high-voltage valve outputs, airflow switch monitoring loops, and flame detector inputs from internal control microprocessors. Continuous flame signal processing continuously evaluates flame presence over 4-20 mA telemetry or specialized flame sensor circuits, triggering an immediate fail-safe shutdown upon loss of flame or safety interlock fault.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the RM7840L1026 relay module be hot-swapped while line voltage is active?\u003c\/p\u003e\n\u003cp\u003eA: No, main line power supplying the wiring subbase and field actuators must be completely de-energized prior to installing or removing the module.\u003c\/p\u003e\n\u003cp\u003eQ: How does the 15-second post-purge operate during sequence completion?\u003c\/p\u003e\n\u003cp\u003eA: Upon normal burner shutdown or safety interruption, the module keeps the combustion air blower energized for a fixed 15-second post-purge cycle to clear unburned fuel gases from the combustion chamber.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cp\u003eEnsure main power is completely disconnected before inserting the RM7840L1026 module into its matching 7800 Series wiring subbase. Snap the protective dust cover tightly into position to guard internal relay components against dust and particulate contamination. All high-voltage ignition leads and AC load circuits must be installed in separate grounded conduits away from low-voltage flame signal lines to avoid electromagnetic interference. Connect the subbase terminal grounding bar directly to panel earth using a heavy-gauge copper conductor.\u003c\/p\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":45422063190131,"sku":"RM7840L1026","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/RM7898A1000_4656da8a-4ddc-430f-a05f-3494b4d240fe.png?v=1788147503","url":"https:\/\/www.dcssupplier.com\/products\/honeywell-rm7840l1026-relay-module","provider":"DcsSupplier Limited","version":"1.0","type":"link"}