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www.supplyhouse.com/Taco-SR502-4-2-Zone-Switching-Relay

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

www.taco-hvac.com/track_file.html?file_to_download_id=18740

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.

www.pexuniverse.com/taco-sr502-4-switching-relay

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

www.homedepot.com/p/Taco-2-Zone-Switching-Relay-SR502-4/203242579

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

www.amazon.com/Taco-TSR502-4-Zone-Switching-Relay/dp/B008G8S7W6

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

www.amazon.com/Taco-Zone-Switching-Relay-Priority/dp/B0009X1KPM

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

www.houseneeds.com/heating/hydronic-heat-supplies/taco-switching-relay-circulating-pump-sr502-4

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

www.ask.com/youtube?q=Taco+Sr502&v=dv4H6bt3Js4
Mar 14, 2014 ... Taco Switching Relays control the operation of circulator pumps in hydronic heating systems. They combine clearly-labeled circuit board ...

forum.heatinghelp.com/discussion/155722/taco-no-call-for-heat

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 ...