I have a Weil Mclain WTGO-4 boiler with a tankless coil. The boiler was converted to gas in 2018 and is controlled by a hydro level 3250 aqua stat. I have four heating zones; two are hydroair, one is 50ft or so of baseboard fin convectors, and the fourth is two fan driven kickspace convectors.
If all zones run simultaneously, I get a nice long run out of the boiler. Its output appears to be balanced well with needs for all zones simultaneously. If 3 or fewer zones are running, the boiler reaches high limit temp within 5 minutes (3 minutes for 1-2 zones); turns off for maybe 5-7 minutes, and then refires. I feel like these shorter burns are problem; am i wrong?
I have been trying these two aquastat settings to maximize burn time but not heat the boiler too hot. Can you let me know if one may be better (both have no issue satisfying heat and DHW needs)
1) Low 160F, High 175F, High Diff of 10. (this is typically what the aquastat does when I use the eco feature). The temp is enough heat for the house (for now), but you can imagine it results in pretty short burns that happen more frequently over long heat calls. Three minute burn to reach high, 3-5 minutes to refire.
2) Low 160F, High 185F, High Diff of 20F. Here, I set a higher temp (higher than I need right now) so I can go with a higher diff. My thought process is that this will allow the boiler temp to drop lower (still at a comfortable temp for heat) before refiring. Thus, to return to the high limit, it will take longer and hopefully fire less frequently during a call (especially since my zones aren't the highest btu and will more slowly drop boiler temp).
thanks for the help. let me know if any other information will be useful.
If all zones run simultaneously, I get a nice long run out of the boiler. Its output appears to be balanced well with needs for all zones simultaneously. If 3 or fewer zones are running, the boiler reaches high limit temp within 5 minutes (3 minutes for 1-2 zones); turns off for maybe 5-7 minutes, and then refires. I feel like these shorter burns are problem; am i wrong?
I have been trying these two aquastat settings to maximize burn time but not heat the boiler too hot. Can you let me know if one may be better (both have no issue satisfying heat and DHW needs)
1) Low 160F, High 175F, High Diff of 10. (this is typically what the aquastat does when I use the eco feature). The temp is enough heat for the house (for now), but you can imagine it results in pretty short burns that happen more frequently over long heat calls. Three minute burn to reach high, 3-5 minutes to refire.
2) Low 160F, High 185F, High Diff of 20F. Here, I set a higher temp (higher than I need right now) so I can go with a higher diff. My thought process is that this will allow the boiler temp to drop lower (still at a comfortable temp for heat) before refiring. Thus, to return to the high limit, it will take longer and hopefully fire less frequently during a call (especially since my zones aren't the highest btu and will more slowly drop boiler temp).
thanks for the help. let me know if any other information will be useful.
source https://hvac-talk.com/vbb/showthread.php?2223611-Boiler-Question-about-most-efficient-boiler-settings&goto=newpost
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