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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/uploads/FileLibrary/102-168.pdf

EFFECTIVE: June 1, 2006. Plant ID# 9300-2100. SR 502. THERMOSTATS. ZONE1 ZONE2 ... Combine the reliability of the Taco Zone Valves, Priority Zoning .

www.taco-hvac.com/uploads/FileLibrary/102-377.pdf

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

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

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.houseneeds.com/heating/hydronic-heat-supplies/taco-circulator-pump-switching-relay

Taco Circulator Relay - 2 zone single throw with end switch for boiler - for Circulating. v2885. Taco Circulator Relay - SR502-4. • 2 zones single throw with end ...

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

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

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 ...