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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 ...


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


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


TACO ZONE CONTROLS WIRING GUIDE. Pages. Switching Relays .... SR502/ 503 Switching Relay Controlling Another SR504/506 Switching Relay. SIX ZONE  ...


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


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


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


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 ...


Taco SR 502 two zone switching relay. Used, works just fine. I upgraded to a four zone relay due to recent addition and heat to cellar. Any questions, please feel ...