{"product_id":"honeywell-rm7840l1018-u-auto-programming-controller","title":"Honeywell RM7840L1018\/U Auto Programming Controller","description":"\u003cp\u003eThe \u003cstrong\u003eRM7840L1018\/U\u003c\/strong\u003e is a microprocessor-based integrated burner control engineered for automatically fired gas, oil, coal, or combination fuel single burner applications. It executes automatic burner sequencing, flame supervision, and system diagnostics, providing advanced safety and functional capabilities supported by nonvolatile memory and interchangeable plug-in flame amplifiers.\u003c\/p\u003e\n\u003ch3\u003eSystem Architecture and Compatibility\u003c\/h3\u003e\n\u003cp\u003eDesigned to operate on 120 Vac (+10%, -15%) at 50 or 60 Hz, the control requires a Q7800A or Q7800B Universal Wiring Subbase, an ST7800A Plug-in Purge Timer Card, and a compatible flame signal amplifier such as the R7847, R7848, R7849, R7851, R7852, R7861, or R7886 series. It features five sequence-indicating LEDs, a five-function run\/test switch, and access points for external electrical voltage checks.\u003c\/p\u003e\n\u003ch3\u003eSafety and Operational Timings\u003c\/h3\u003e\n\u003cp\u003eThe unit provides selectable pilot flame establishing periods of 4 or 10 seconds and main flame establishing periods of 10, 15, 30 seconds, or intermittent operation, alongside a 15-second postpurge and 5-second early spark termination. Prepurge timing is determined by the installed ST7800A purge timer card, while internal logic manages running interlocks and safety lockouts.\u003c\/p\u003e\n\u003ch3\u003eTechnical Parameters\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\u003eRM7840L1018\/U\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\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eAuto Programming Controller\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eProgramming Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage\u003c\/td\u003e\n\u003ctd\u003e120 Vac (+10, -15%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency\u003c\/td\u003e\n\u003ctd\u003e50 Hz; 60 Hz (plus\/minus 10%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlame Establishing Period - Pilot\u003c\/td\u003e\n\u003ctd\u003e4 sec or 10 sec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlame Establishing Period - Main\u003c\/td\u003e\n\u003ctd\u003e10 sec, 15 sec, 30 sec, or Intermittent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePostPurge\u003c\/td\u003e\n\u003ctd\u003e15 sec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEarly Spark Termination\u003c\/td\u003e\n\u003ctd\u003eYes, 5 sec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Components\u003c\/td\u003e\n\u003ctd\u003eQ7800A, B Subbases; R7847-R7886 Amplifiers; ST7800A Purge Timer Card\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (with Q7800A Subbase)\u003c\/td\u003e\n\u003ctd\u003e127 x 127 x 133 mm (5 x 5 x 5 1\/4 in.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (with Q7800B Subbase)\u003c\/td\u003e\n\u003ctd\u003e127 x 127 x 155 mm (5 x 5 x 6 3\/32 in.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e2.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping and Storage Temp\u003c\/td\u003e\n\u003ctd\u003e-40 to +60 deg C (-40 to +140 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApprovals\u003c\/td\u003e\n\u003ctd\u003eUL Recognized, CSA Certified, FCC Part 15 Class B, Factory Mutual, CSD-1, Swiss RE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003cp\u003eFrequently Asked Questions\u003c\/p\u003e\n\u003cp\u003eQ: What components are required to operate the Honeywell RM7840L1018\/U controller?\u003c\/p\u003e\n\u003cp\u003eA: It requires a Q7800A or Q7800B Universal Wiring Subbase, an ST7800A Plug-in Purge Timer Card, and a compatible flame signal amplifier.\u003c\/p\u003e\n\u003cp\u003eQ: How is the prepurge interval determined for this burner control?\u003c\/p\u003e\n\u003cp\u003eA: The prepurge time is determined directly by the specific ST7800A plug-in purge timer card installed in the system.\u003c\/p\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":68086508028200,"sku":"RM7840L1018\/U","price":315.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0827\/6266\/2184\/files\/RM7850A1019_c0372275-d47a-4292-b1a5-33fd70dc2613.png?v=1793700080","url":"https:\/\/www.powerdcs.com\/ar\/products\/honeywell-rm7840l1018-u-auto-programming-controller","provider":"Power DCS Parts Limited","version":"1.0","type":"link"}