{"product_id":"honeywell-rm7838a1014-relay-module","title":"Honeywell RM7838A1014 Relay Module","description":"\u003cp\u003eConfigured for automatic burner sequencing and flame safety monitoring in industrial fuel-burning systems, the \u003cstrong\u003eHoneywell RM7838A1014\u003c\/strong\u003e (\u003cstrong\u003eRM7838A\u003c\/strong\u003e Relay Module) provides direct physical\/electrical execution. It controls intermittent pilot timing, processes running interlocks, and interfaces directly with a keyboard display module. Pre-purge duration is determined by an ST7800A purge timer card installed into the unit.\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\u003eRM7838A1014\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 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 (-40 deg F to +140 deg F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e10 W Maximum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e120 V, 50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePurge Timer Support\u003c\/td\u003e\n\u003ctd\u003eST7800A Purge Timer Card Required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePilot Type\u003c\/td\u003e\n\u003ctd\u003eIntermittent Pilot Type\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUser Interface Integration\u003c\/td\u003e\n\u003ctd\u003ePlug-in Keyboard Display Module Supported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Features\u003c\/td\u003e\n\u003ctd\u003eRunning Interlocks Supervision\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 \u0026amp; Channel Isolation\u003c\/h3\u003e\n\u003cp\u003eThe Honeywell RM7838A relay module isolates dynamic micro-amp flame sensor signals from backplane logic while communicating status parameters to system keypads. Integrated signal paths allow relay status and flame strength data to interface with external 4-20 mA HART loop protocol adapters and DCS field networks. Internal channel-to-channel isolation safeguards central processing components from line-voltage ignition transients, preventing electrical noise propagation into downstream control loops.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the ST7800A purge timer card be replaced while the RM7838A1014 is powered?\u003c\/p\u003e\n\u003cp\u003eA: No. Line voltage power must be completely disconnected from the wiring subbase prior to inserting or removing the purge timer card or the relay module to prevent electrical damage.\u003c\/p\u003e\n\u003cp\u003eQ: How does the unit react if a running interlock opens during normal operation?\u003c\/p\u003e\n\u003cp\u003eA: If a running interlock circuit opens during the burner cycle, the module immediately de-energizes the fuel safety shutoff valves and initiates a safety lockout condition.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eMount the matching 7800 Series wiring subbase inside a grounded metal enclosure to shield control logic from external electromagnetic interference.\u003c\/li\u003e\n\u003cli\u003eSeparate high-voltage ignition cabling from low-voltage flame sensor leads. Run sensor lines in distinct grounded metallic conduit to prevent signal cross-talk.\u003c\/li\u003e\n\u003cli\u003eAlign the RM7838A1014 module guide pins directly with the subbase socket and tighten the integral mounting screws to complete the mechanical ground path.\u003c\/li\u003e\n\u003cli\u003eConnect the main panel earth ground bus directly to the ground lug on the subbase using heavy-gauge copper wire.\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":45434987774067,"sku":"RM7838A1014","price":88.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/RM7840L1075_b86d8fc5-2641-4fb8-a1e1-e1f6e6ab38a7.png?v=1788319584","url":"https:\/\/www.dcssupplier.com\/products\/honeywell-rm7838a1014-relay-module","provider":"DcsSupplier Limited","version":"1.0","type":"link"}