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Posted by Heatpro on December 06, 2005 at 13:21:52:
In Reply to: Re: results of temperature experiment and Phase III posted by Dave on December 06, 2005 at 12:27:13:
You would tee the heated water from the boiler to the return water from the system - at the hot water taps of the tanks, so the boiler Taco 0010 can not force water backwards through the heating circuits because of each of the heating circuit flow checks.
You would tee the supply manifold to the system circuits to the pipe going to the boiler to heat the water - at the cold water taps of the tanks, so the system draws from the tanks and can not pull water from the boiler due to the 0010 check valve.
As to the condensing temperature, the manufacturer might have more say about the expected condensing temperature. The DOE AFUE testing procedure is done at those temperatures, so I doubt there would be condensation at those temperatures as that would make the boiler a condensing boiler for the ratings - not an 80& - 87% AFUE range.
Using a Taco 0012 is more likely to bring the temperature close to condensing than using a 0010 as the temperature rise across the boiler is greater with lower, but sufficient flow. This is similar to saying that the 0012 could cause a 130F temperature and a 140F average temperature with a 0010 due to lower flow rates cooling the tubes less, so the outlet temperature is higher than the inlet by more degrees.
Another point here is that as soon as the system is fired and shuts off the first time, there is 130F water in the tanks to start the boiler cycle next time, not cold water, which would reduce wet time and condensation.
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