{"product_id":"taco-sr506-exp-1-5-inch","title":"Taco SR506-EXP 6-Zone Expandable Switching Relay with Priority","description":"\u003cp\u003eThe \u003cstrong\u003eTaco SR506-EXP 6-Zone Expandable Switching Relay\u003c\/strong\u003e is a premium commercial-grade multi-zone hydronic control panel designed to streamline the wiring and operational logic of complex multi-zone radiant or baseboard heating networks. Encased in a heavy-duty steel cabinet, this central node cleanly consolidates up to 6 independent thermostat inputs and manages up to 6 dedicated zone circulator pumps simultaneously.\u003c\/p\u003e\n\n\u003ch3\u003eAdvanced Expandability \u0026amp; Customization\u003c\/h3\u003e\n\u003cp\u003eEquipped with Taco’s signature \"EXP\" architecture, this module allows system designers to seamlessly link multiple control panels together, expanding a hydronic network up to 20 total zones. Integrated PowerPort slots allow maintenance engineers to plug in advanced add-on control cards—such as outdoor reset parameters or post-purge timers—enabling total customization of multi-stage boiler operations without changing the underlying wiring framework.\u003c\/p\u003e\n\n\u003ch3\u003eIntelligent Network Integration \u0026amp; Safeguards\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSwitchable Zone 1 Priority:\u003c\/strong\u003e Features a dedicated priority toggle switch, allowing Zone 1 to temporarily deactivate zones 2 through 6—ideal for delivering instantaneous thermal output to indirect domestic hot water heaters.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExternal Diagnostic LED Array:\u003c\/strong\u003e Bright external indicator lights provide real-time visual diagnostics, allowing technicians to verify power status, thermostat calls, and individual pump activation instantly.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReplaceable \"Ice Cube\" Relay Relays:\u003c\/strong\u003e Built with standard field-replaceable fully enclosed snap-out relays and robust fuse protection to insulate the core computer board from external electrical surges.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eLooking for complex multi-panel wiring schematics or terminal block configurations? \u003ca href=\"\/pages\/contact-us\" title=\"Request Official Taco Submittal\"\u003eClick here to request the official factory submittal manuals from our engineering desk.\u003c\/a\u003e\u003c\/em\u003e\u003c\/p\u003e","brand":"Taco","offers":[{"title":"Default Title","offer_id":42913101873246,"sku":"EXP-11\/2INCH-1261","price":365.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/Taco_SR506_expandable_6_zone_hydronic_switching_relay_featuring_a_heavy_duty_green_steel_enclosure_case_with_external_diagnostic_LED_status_window..jpg?v=1782048569","url":"https:\/\/nationalboilersupply.com\/products\/taco-sr506-exp-1-5-inch","provider":"National Boiler Supply","version":"1.0","type":"link"}