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Taco s501 relay switch wiring

3K views 2 replies 2 participants last post by  threequez 
#1 ·
I need to wire a taco s501 relay to operate a second circ pump and zone valve for a radiant zone.....there are 2 wires (rd/white) from the tt state in the room and there are 4 wires (grn/bl/rd/wh) going to the boiler and zone valve can anyone explain how I wire the 4 wires to the S501 relay....thanks
 
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