{"product_id":"honeywell-l404f1391u-pressure-controller","title":"Honeywell L404F1391U Pressure Controller","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe Honeywell L404F1391U is a pressure controller designed to monitor and regulate system pressure in hydronic heating and cooling applications. It operates as a sensing and switching device that responds to changes in water or fluid pressure, opening or closing a circuit to protect equipment and maintain safe operating conditions. Licensed HVAC technicians and hydronic heating specialists typically install this controller as part of a boiler or circulating loop system. The L404F1391U provides reliable pressure-actuated switching to support both safety shutoff and operational control functions within closed-loop fluid systems.\u003c\/p\u003e\u003cp\u003eThis pressure controller is suited for residential and light commercial hydronic systems, including hot water boilers and associated piping loops. It is typically installed at a point in the system where pressure monitoring is required to trigger a control action, such as high-pressure cutout or low-pressure lockout. Consult the system schematic and original equipment documentation to confirm proper placement and setpoint configuration before installation.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003ePressure-actuated switching for hydronic heating and cooling system control\u003c\/li\u003e\n\u003cli\u003eSupports both safety shutoff and operational pressure control functions\u003c\/li\u003e\n\u003cli\u003eDesigned for installation in boiler and closed-loop fluid piping systems\u003c\/li\u003e\n\u003cli\u003eCompact controller format suitable for residential and light commercial applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement pressure controller for residential and light commercial hydronic boiler and fluid system applications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician or hydronic heating specialist familiar with applicable mechanical codes. Shut down the boiler and relieve system pressure before disconnecting or installing any pressure controller. Verify that system pressure is within the controller operating range before returning the system to service. Follow local codes and the equipment manufacturer's wiring and mounting instructions throughout the installation process.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 2 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC\u003c\/strong\u003e: 08526725823\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: Honeywell\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: L404F1391U\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HONEYWELL","offers":[{"title":"Default Title","offer_id":51383008100658,"sku":"L404F1391U","price":382.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/312676140.jpg?v=1782585298","url":"https:\/\/voomisupply.com\/products\/honeywell-l404f1391u-pressure-controller","provider":"Voomi Supply","version":"1.0","type":"link"}