By Gary-Floor Heat | May 4, 2023. 0/0. Helpful. Report. Yup. This has two wire input from thermostat that relays to your corresponding circulator. So you would need a three- wire thermostat wire (one to power your thermostat) which you can get 24v off of this Taco Switching Relay as well. By DaveW | Dec 20, 2016. 0/0. Helpful.. This item: SR503-4 TACO 3 ZONE CIRCULATOR RELAY WITH PRIORITY ** NOT EXPANDABLE OLD# SR503-2 . $197.81 $ 197. 81. Get it Jan 30 - Feb 4. In Stock. Ships from and sold by Plumbing Planet. + Taco 007-F5 Cast Iron Circulator, 1/25 HP Pump with Universal Pump Flange Gaskets and Wire Gland, Green.
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Model # SR503-4. Store SKU # 929948. Taco Comfort Solutions. Taco SR503 Switching Relay. Questions & Answers.. Taco SR503-4 - 3 Zone Switching Relay- The Taco SR503-4 Switching Relay is the best choice for all your zoning needs, with advanced PowerPort Cards, external diagnostic lights, switchable priority and contractor friendly PC board layouts. Combined with the time proven reliability of the 00 family of circulators and thermostats, total system integrating is achieved.
