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Taco 3-Zone Switching Relay w/priority, Expandable Taco's New Relays: Easy Installation and Customization for Your Zoning Needs Hi, Looking for an answer to hopefully simple question: I have a single zone, heat only boiler with a L7224 Aquastat (no C wire port). Enhanced Switching Relay SR504-EXP Taco SR501switching relay installation for hydronic heaters with fan in garages and other locations. Connection with hot water How to Know if the Control Board is Bad? #hvac #controlboard This HVAC Training Video goes over the High-Efficiency Taco Sentry Zone Valve. I go over installation practices, head removal, ...