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New House: Humming/Heartbeat and more
So I'm at a new house which has been poorly maintained including the steam heat systems (. I got the boilers flushed and they seem to be in decent shape. Two bigger main vents were put in for one boiler and they suggested the other boiler to have a bigger main vent put in as well. One of the long returns pipes was sagging so they recommended the pitch be increased and we may have the entire pipe replaced. I hope all that sounds pretty good.
Now I have a couple of issues:
1. It seems that one side of the house has the heat completely shutoff (the first and third-floor radiators have the shutoff valve completely open (even when the air valve on the first floor is removed, no air is coming through). The second floor is closed and the radiator is not connected). Is this something anyone has encountered before? I'm very confused by this and don't know what to think (maybe the pipes on that side have issues?).
2. Whenever I'm in the first-floor unit and the second-floor unit's heat is on, I hear a low-frequency humming/heartbeat. I contacted the gas company and they said it wasn't the gas line. So I have no clue what this could be. Could it be related to a capped pipe on the third floor?
3. The gas person said the boiler was a pretty big boiler (140k BTU/HR) for what seemed to be planned 9 radiators (7 on the second floor and 2 on the third floor) (currently 1 pipe on the third floor is capped, the other third floor has no air coming, one on the second floor is disconnected from the radiator). What is the best way to deal with an oversize boiler?
I'm overwhelmed by all this and would appreciate any help you may have! Thank you in advanced!