primary/secondary pumps (how to wire the primary pump)

Dan_15

I'm setting up a boiler with primary/ secondary piping. 3 zones. 2 radiant and an indirect. My question is how do i wire the circ on the primary loop to run whenever any of the secondary pumps come on? I'm using a taco sr504 expandible 4 zone switching relay with priority (If i can).

hydronicsmike

X-X End Switch

Could use the X-X End Switch on the 504 to run this pump. If you also need a dry-contact close for your boiler, then you could have a DPDT Relay energized by the X-X terminals on 504. one N/O contact is used to switch power to the pump and the other can provide a call for heat to a boiler or reset control.

Hope this helps. If not, call the guys at TACO, they are great!!

Mike

carol_3

thanks, hydronicsmike