About five years ago I added two new cast iron radiators to an existing monoflo system. The radiators are below the main piping. I did use the proper monoflo fittings as the system worked properly upon start up. The customer was not using the basement with the two added radiators. Simply shut off the valves to the radiators. This year he opened the valves and the two radiators would not heat. The rest of the radiators in the house are heating. I replaced the shut off valves to be sure they were not the issue. I even visually looked into the monoflo Ts and could not see any debris etc. When I opened the bleeders I did get water and no air. Lastly the feed valve did overfeed and caused the system pressure to exceed 30PSI. Replaced the feeder and bled air tank system pressure is now 20PSI when heating at 160 degrees. Looking for some Help!!
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