Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Counterflow system problems
I have been working on a system for about two heating seasons now trying to correct problems they are having. The problems are spitting vents, banging, and uneven heating and according to the homeowner these were new issues. The first thing we did was re-pipe the boiler, add main vents, skim the boiler and clean/flush the boiler. The biggest problem with the system which we did not correct is every radiator is fed with 1" and all but two should be 1 1/4". The reasons why we did not correct this problem are 1- The cost, 2- Most of the feeds are buried in the foundation where they go up to the radiators and would require chipping away at an old fieldstone foundation, and 3- Because it has worked in the past. I have Gorton #4s on every radiator because if we put anything bigger the radiators will spit. I installed a vaporstat and we have tried many different operating pressures. I think right now I have it cutting out at 12 oz. The vents are no longer spitting but the boiler is short cycling pretty badly and it is taking very long (too long) for the radiators to heat up. When we put bigger vents on the radiators they spit. I have not tried bigger main vents because they heat up fast. The only thing left I can think of to do is to replace all of the run outs and size them properly which is going to be difficult and expensive. Is there anything else that can be done? I can't think of anything. The EDR calculation is 374. The boiler is an IN6 which has a rating of 450 and is the closest size without going under. We have two counterflow mains. The front main is 10' 2 1/2", 10' 2", and 6' 1 1/2" and gas 1 Gorton #1. The back main is 5' 2 1/2, 10' 2" and 5' 1 1/2" and also has one Gorton # 1.