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Posted by Dave on December 20, 2005 at 12:05:10:
Next week, we will be having our Ergomax tank installed as a buffer tank for our Lochinvar Efficiency+ copper tube boiler. I'm trying to figure out the best way to rewire the controls. Eventually I would like to get a controller with outdoor reset, but for the time being, I just want to get it working independently.
Currently, we have a Taco SR504 switching relay. That is wired visa its end switch terminals into the R1/W1 screws on the boiler terminal strip. Our boiler pump is then hardwired into the boiler circuitry via line voltage. Whenever any single zone pump calls for heat, the boiler pump runs, and then boiler fires when the water temp gets below about 150 (cold start).
I was thinking of removing the wire that comes from the Taco relay on the terminal strip of the boiler and replacing it with the 24v wiring from the aquastat on the Ergomax tank.
That way, when the individual zone pumps are pulling from the Ergomax, the boiler and boiler pump are not operating. However, when the Ergomax gets down to the set temp (about 150), the aquastat from the Ergomax would act essentially the way the Taco switching relay used to and fire the boiler and boiler pump.
Does that sound the easiest?
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