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Thank you in advance for your help, I'm looking to make changes to my series loop radiant heat system. A hack installed a LAARs Mascott II combi in our "as is" purchased house and I'm finally getting to fixing this issue.
Prompting me to look at the system 1.) is the boiler would cycle way too much 2.) even after running a heat loss calculation and verifying we have the appropriate amount of baseboards the system still struggles to heat the house 3.) Always hear the bubbles of air, especially by the circulator pumps no matter how much I purge the system
I "fixed" the cycling issue by having a LAARs certified installer come out and he adjusted some settings and in particular the Anti Short Cycle amount. But I'm still concerned about the overall design of the piping and system. I cannot find a plumber or heating company that is willing to work with me to design the layout or verify it's done correctly...I'm absolutely fine in letting an expert (and paying him/her to do it) but no one wants to!
The current system design matches the layout recommended by LAARs in their installation manual (copy is attached), which the exception of two areas.
1.) Piping on the supply manifold does not increase from 3/4" to 1 1/4" as is recommended. Instead it increases to 1" for the supply manifold, with an air scoop, expansion tank and two circulator pumps (taco 007).
2.) Piping on the return manifold is simply both zones meeting into a "T" with 3/4" pipe straight to the boiler. Again, LAAR's recommends 1 1/4" at this point back to the boiler.
So three things I want to do/verify.
1.) Obviously increasing both supply and return manifold to 1 1/4" Should help right?
2.) I plan on throwing away the air scoop and replacing it with a spirovent jr 1 1/4" air eliminator. Good choice?
3.) Are the Taco Circulators appropriate for my install? I have a simple 2 "zone" system with one for each floor of a two story house. They run on a loop around the perimeter, approx. 150ft of pipe each (house is 36'x24').
Thank you in advance for your expertise, advice and or questions!
Paul in CT