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The Taco SR502-4 Switching Relay is the best choice for all your zoning needs, with advanced PowerPort Cards, external diagnostic lights, switchable priority ...


Operation: When any thermostat calls for heat, the appropriate circu- lator is energized and the isolated end switch (X and X) will start the boiler.


Taco SR502 Switching Relay combines clearly labeled PC board layout with advanced features that allow for total system customization. External indicator lights ...


Apr 22, 2016 ... The Taco 2-Zone Switching Relay features advanced power port card, external diagnostic light, switchable priority and contractor friendly PC ...


Taco TSR502-4 Two Zone Switching Relay: Sump Pump Accessories: Amazon. com: Industrial & Scientific.


Part Number, SR5022. Number of Items, 1. Brand Name, Taco. EAN, 0687752389517. Item Weight, 4.0. Model Number, SR 502. UNSPSC Code, 40101800.


The Taco SR502-4 switching relay is UL listed, use standard replaceable relays and are compatible with conventional and programmable thermostats.

Mar 14, 2014 ... Taco Switching Relays control the operation of circulator pumps in hydronic heating systems. They combine clearly-labeled circuit board ...


It is a circulator system. There are 2 separate Taco switching relays. The SR506 ( 2 zone radiant) is working; the SR502 (4 zone baseboard) is ...