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-   -   cycle lights off a HW boiler stat (http://www.diychatroom.com/f17/cycle-lights-off-hw-boiler-stat-192342/)

biggles 12-19-2013 08:46 PM

cycle lights off a HW boiler stat
 
wired in the circulator and the hi limit to see the boiler and how it runs as the temps change.... http://i275.photobucket.com/albums/j...ps6179ad49.jpg ...:whistling2: hvac techs like to tweek systems http://i275.photobucket.com/albums/j...ps0340375c.jpg

beenthere 12-20-2013 05:08 AM

I'm guessing the timers to track run times are down at the boiler. :thumbsup:

biggles 12-20-2013 07:08 AM

that was a thought....how about this trick coil up 3/4 soft copper like a giant truck spring....:wink: slide it on the static flue pipe out of the boiler.pipe the return up to it with a 3-way valve and a TC-1 strapped to that return leaving the coil to pick up those BTUs going up the flue.good way to squeeze the last bit of heat out of a cycle...I won't touch that till spring if I ever get motivated.it would satisfy the burner TC-1 for sure,and just the circ.will run called from the house stat

Bondo 12-20-2013 10:24 AM

Quote:

Originally Posted by biggles (Post 1280679)
that was a thought....how about this trick coil up 3/4 soft copper like a giant truck spring....:wink: slide it on the static flue pipe out of the boiler.pipe the return up to it with a 3-way valve and a TC-1 strapped to that return leaving the coil to pick up those BTUs going up the flue.good way to squeeze the last bit of heat out of a cycle...I won't touch that till spring if I ever get motivated.it would satisfy the burner TC-1 for sure,and just the circ.will run called from the house stat

Ayuh,.... That sounds good in theory, but in real life it can bite ya, Badly,...

Robbin' All the heat outa the stack, slows or stops the gases Upward movement,...

danpik 12-20-2013 10:48 AM

careful how much heat you pull out of the stack. Too much temp drop and you will start condensating the water out of the flue gasses.

beenthere 12-20-2013 03:10 PM

Condensation would be a concern.

old_squid 12-21-2013 09:45 AM

Quote:

Originally Posted by biggles (Post 1280679)
that was a thought....how about this trick coil up 3/4 soft copper like a giant truck spring....:wink: slide it on the static flue pipe out of the boiler.pipe the return up to it with a 3-way valve and a TC-1 strapped to that return leaving the coil to pick up those BTUs going up the flue.good way to squeeze the last bit of heat out of a cycle...I won't touch that till spring if I ever get motivated.it would satisfy the burner TC-1 for sure,and just the circ.will run called from the house stat

They already invented this..... it's called a condensing boiler. And they come with powered exhaust and use stainless steel venting or PVC. The powered exhaust to ensure proper draft and removal of flue gases from the unit and the SS and PVC because once cooled down to the condensation point, the moisture is very corrosive. :whistling2:


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