{"product_id":"lochinvar-l100208502-pump-relay-knight-xl-kb399-kb800","title":"Lochinvar L100208502 Pump Relay Knight Xl KB399 KB800","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe LOCHINVAR L100208502 is a pump relay designed for use in high-efficiency condensing boiler systems. It controls the switching of the system circulation pump in response to signals from the boiler control, enabling proper sequencing of pump operation during heating cycles. This component is an OEM-specified part suited to commercial and residential hydronic heating applications. Licensed plumbers and HVAC technicians servicing Knight XL heating boilers will find this relay integral to maintaining correct pump control logic within the system.\u003c\/p\u003e\n\u003cp\u003eThis pump relay is specified for use with the Knight XL Model KB399 to KB800 heating boiler equipped with a 1.5 hp pump. It is used in hydronic heating installations where the boiler control board sends a low-voltage signal to energize or de-energize the circulation pump. Proper relay function ensures the pump operates only during appropriate demand conditions, protecting the heat exchanger and extending system life.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eOEM-specified pump relay for Knight XL condensing boiler systems\u003c\/li\u003e\n  \u003cli\u003eControls circulation pump switching in hydronic heating applications\u003c\/li\u003e\n  \u003cli\u003eCompatible with 1.5 hp pump configurations on KB399 to KB800 models\u003c\/li\u003e\n  \u003cli\u003eSupports correct pump sequencing to protect the heat exchanger\u003c\/li\u003e\n  \u003cli\u003eDirect replacement part for simplified serviceability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with the Knight XL Model KB399 to KB800 heating boiler with a 1.5 hp pump.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician or plumber familiar with hydronic heating systems. Before servicing, shut off electrical power to the boiler at the disconnect switch and allow the system to cool. Follow all applicable local codes and the manufacturer service documentation when replacing relay components. Do not restore power until all wiring connections are verified secure and the access panel is reinstalled.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible System\u003c\/strong\u003e: Knight XL Model KB399 to KB800\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Pump Size\u003c\/strong\u003e: 1.5 hp\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication\u003c\/strong\u003e: Hydronic heating boiler\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: LOCHINVAR\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: L100208502\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LOCHINVAR","offers":[{"title":"Default Title","offer_id":51343056273714,"sku":"L100208502","price":117.3,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/100208502.jpg?v=1782015109","url":"https:\/\/voomisupply.com\/products\/lochinvar-l100208502-pump-relay-knight-xl-kb399-kb800","provider":"Voomi Supply","version":"1.0","type":"link"}