The Taco SR504-EXP Expandable Circulator Relay is equipped with advanced Features that include being Expandable to 20 Zones including the exclusive Taco PowerPort Plug In Card.
The Taco SR504EXP has such features as post purge priority protection and pump exercise can be added with ease. Any EXP switching relay can interface with the boiler reset control and the injection mixing add on power controls. Mix and match to customize the system.
External link | Downloadable Files
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Product Spec Sheet
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