Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

2-Pipe Convector Clog

eneskey Member Posts: 1
My building has convectors in each unit, they are 2-Pipe supply and return. In winter its hot water circulating from the boiler and in the summer this switches to cooled water. At times they need to be bled to get the air out of the coil for heating or cooling. Lately we've been running into other issues.

The lower apartments have been submitting work orders for no AC. The convectors are having flow issues, it seems that either supply or in many cases the return line is clogged. (Sometimes the coil) It is brown rust, sludge, etc.

What is the best way to clean this out? Suck from the supply line? Push through the coil? Push the return?

What equipment? Pump?

Any help would be appreciated.


  • Jamie Hall
    Jamie Hall Member Posts: 23,322
    Well, a reverse flush -- pushing from the returns -- might be the best approach. You are going to need a fair amount of flow -- and may need a fair amount of pressure. And do one bit of pipe or piece of equipment at a time.

    Then sit down and figure out where the sludge is coming from. It shouldn't be there, and isn't good.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England