{"product_id":"tjernlund-products-whke","title":"Tjernlund Products WHKE Control Interlock","description":"\u003cp\u003eFor contractors interlocking millivolt-controlled water heaters with a power venting system, the \u003cstrong\u003eTjernlund WHKE Control Interlock\u003c\/strong\u003e is the industry standard for ensuring safe and reliable operation. This kit is specifically designed to interface between gas-fired appliances and Tjernlund \u003cstrong\u003eUC1 Universal Control\u003c\/strong\u003e, MAC1E, or MAC4E auxiliary modules. By sensing gas flow through a \u003cstrong\u003evertical-mount gas pressure switch\u003c\/strong\u003e, the WHKE signals the inducer to activate immediately upon a call for heat via the A-B dry contacts. The inclusion of the \u003cstrong\u003eJA1 thermocouple junction adapter\u003c\/strong\u003e allows for seamless integration with 30-millivolt systems without modifying the original pilot assembly. Techs should note that the integrated \u003cstrong\u003elinear limit spill switch\u003c\/strong\u003e acts as a critical safety bypass, disrupting the millivolt safety circuit to disable the burner if flue gas spillage is detected at the draft hood. This \u003cstrong\u003emillivolt water heater interlock kit\u003c\/strong\u003e provides a hardwired, fail-safe solution that prevents the burner from firing if the power venter fails to establish proper draft.\u003c\/p\u003e\n\n\u003cstrong\u003eKey Benefits for the Professional Installer:\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Engineered for seamless integration with \u003cstrong\u003emillivolt gas valves\u003c\/strong\u003e and \u003cstrong\u003eUC1 universal controls\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnhanced Safety:\u003c\/strong\u003e Features a \u003cstrong\u003emanual reset linear limit switch\u003c\/strong\u003e to prevent operation during venting malfunctions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSimplified Wiring:\u003c\/strong\u003e Color-coded leads and 1\/4\" compression fittings facilitate fast installation in tight mechanical rooms.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReliable Sensing:\u003c\/strong\u003e The diaphragm-actuated gas pressure switch ensures the \u003cstrong\u003epower venter\u003c\/strong\u003e cycles only when needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComplete Kit:\u003c\/strong\u003e Includes the \u003cstrong\u003eJA1 thermocouple adapter\u003c\/strong\u003e and aluminum bleed tubing required for a professional-grade setup.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cstrong\u003eCommon Contractor Questions:\u003c\/strong\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use one WHKE kit for multiple water heaters?\u003c\/strong\u003e\u003cbr\u003e\nNo. Each millivolt appliance requires its own dedicated WHKE kit to ensure the safety limit circuit and gas pressure sensing are isolated and effective for each burner.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat happens if the power venter fails to start?\u003c\/strong\u003e\u003cbr\u003e\nThe gas pressure switch will not see the pressure change required to close the dry contacts, or the fan prover on the UC1 will not clear the burner to fire, preventing unsafe combustion.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the JA1 adapter required for all installations?\u003c\/strong\u003e\u003cbr\u003e\nThe JA1 is used for 30-millivolt heaters. For 750-millivolt (power pile) systems, you should wire the linear limit spill switch in series with the water heater's ECO safety circuit instead.\u003c\/p\u003e\n\n\u003cp\u003eDisclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.\u003c\/p\u003e","brand":"Tjernlund Products","offers":[{"title":"Default Title","offer_id":43465313091762,"sku":"WHKE","price":230.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Screenshot_2023-11-30_134804-removebg-preview.png?v=1701380929","url":"https:\/\/www.gsistore.com\/products\/tjernlund-products-whke","provider":"GSIstore","version":"1.0","type":"link"}