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Air in convectors

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Steamer30
Steamer30 Member Posts: 8
in Strictly Steam
I have a low pressure steam boiler that uses convectors housed in the wall to spread the heat. They have a thermostatic operator and a B&J thermostatic angle trap on them. Somehow air has gotten into the system and is stopping heat from entering convectors. Keep in mind they are not cast iron radiators where I can drill and air vent in on the side. So my question is - how do I bleed the air out?

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  • Steamer30
    Steamer30 Member Posts: 8
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    Picture of convector

    Here is a picture of it. Trap is on right and valve on left
  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,576
    edited November 2013
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    Convector problem

    At rest, there is always air inside a steam system, and with good venting, the air will escape with little or no resistance (back-pressure).

    This seems essentially like a 2-pipe system, with traps at the return end whose job is to let out air, and water. They should not have radiator vents on them.

    Trace out the supplies and returns, looking for a sag which is pooling water, and stopping the air from escaping. Look for a cross over trap which has failed.

    If the boiler is throwing up water, then that will exacerbate the problem, so post some pics of the boiler and it's piping.--NBC
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