{"product_id":"caleffi-zsr103-z-one-3-zone-expandable-switching-relay-for-circulator-pumps-with-priority-120vac","title":"Caleffi ZSR103 Z-One 3-Zone Expandable Switching Relay for Circulator Pumps with Priority, 120VAC","description":"\u003cp\u003eThe Caleffi ZSR103 Z-One is a 3-zone switching relay that controls circulator pumps in a zoned hydronic heating system, with priority and 120VAC input.\u003c\/p\u003e\u003cp\u003eEach thermostat call starts the matching zone circulator and sends a heat demand to the boiler. The priority function lets one zone, typically indirect domestic hot water, take precedence over the others. The control is expandable for systems that need more zones, and each pump circuit is rated at 5 amps. The enclosure measures 9.25\" high x 11\" wide x 3\" deep.\u003c\/p\u003e\u003cp\u003eBefore ordering, confirm the number of zones (3) and that each circulator draws no more than 5 amps. Use the installation manual to plan thermostat and expansion wiring.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Caleffi\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e ZSR103\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e Z-One\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Switching Relay for Zone Pumps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Zones:\u003c\/strong\u003e 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpandable:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePriority:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Input:\u003c\/strong\u003e 120 VAC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump Circuits:\u003c\/strong\u003e 5 A each\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (H x W x D):\u003c\/strong\u003e 9.25\" x 11\" x 3\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 8016615438116\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Switching Relays\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDocuments\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/res.cloudinary.com\/dzhpkjoqj\/Caleffi\/ZSR103_CALE-ZSR103_8016615438116_TechB.pdf\" target=\"_blank\" rel=\"noopener\"\u003eTechnical Data Sheet\u003c\/a\u003e (PDF)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/res.cloudinary.com\/dzhpkjoqj\/Caleffi\/ZSR103_CALE-ZSR103_8016615438116_Inst.pdf\" target=\"_blank\" rel=\"noopener\"\u003eInstallation \u0026amp; Operation Manual\u003c\/a\u003e (PDF)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/res.cloudinary.com\/dzhpkjoqj\/Caleffi\/ZSR103_CALE-ZSR103_8016615438116_Sell.pdf\" target=\"_blank\" rel=\"noopener\"\u003eTechnical Bulletin\u003c\/a\u003e (PDF)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSee also: \u003ca href=\"\/collections\/switching-relays\"\u003eswitching relays\u003c\/a\u003e, \u003ca href=\"\/collections\/caleffi-north-america\"\u003eall Caleffi products\u003c\/a\u003e.\u003c\/p\u003e","brand":"Caleffi","offers":[{"title":"Default Title","offer_id":50517453144167,"sku":"CALE-ZSR103","price":240.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0651\/2253\/3479\/files\/ZSR103_CALE-ZSR103_8016615438116.jpg?v=1792424654","url":"https:\/\/www.thehousesupplier.com\/products\/caleffi-zsr103-z-one-3-zone-expandable-switching-relay-for-circulator-pumps-with-priority-120vac","provider":"The House Supplier","version":"1.0","type":"link"}