Hey guys, I kept finding this site pop up in all my research over the past few weeks and was hoping to get some advice here.
This is my setup in the basement at the moment:
I have a Taco SR501 (Zone 2):
And an Aquastat L8124C (Zone 1, set to 180/160/10):
Originally, the Taco SR501 (as seen in pics) was setup in the traditional manner, but not connected to the boiler or aquastat AT ALL. So the circulation pump (Zone 2) would run totally independently of the boiler water temp, sometimes all night just pushing cold water since it's a cold water start boiler situation (no hot water off of it)
I recently referred to the SR501 wiring guide here: http://taco-hvac.com/uploads/FileLibrary/102-169.pdf
and have changed the wiring to the alternative wiring setup. I connected my wires to the ZR / ZC on the aquastat. However I have a problem: the SR501 does not work (call the circulation pump, or call for heat) unless I leave the jumper on H and 3. Could this be because there's already a circulator connected to C1?
It works exactly how I want it to right now, however my problem is that the Taco SR501 keeps 120v to the aquastat going so the aquastat thinks it's "getting a call for high heat" off of ZR. The circulation pump doesn't run constantly anymore, but the boiler keeps keeping the temperature up above 170