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removing air

I know this is my third post but I cant get an answer.
Could anyone tell me how to bleed the air from my system.
I have forced hot water.
cast iron radiators that have their own bleeder valve.
two pumps no zone valves.
Many Thanks


  • jim lockard
    jim lockard Member Posts: 1,059
    M.E. Posted the answer on 2/01

    Here we go Mark. Turn off the electricty to the boiler, make sure pump #1 and Pump#2 are not running Check the pressure on the gage 2 story should be 12 to 15 PSI.
    Take a plastic cup -paper will do- and a towel go to your 1st floor Cast iron Rad. open the vent with your rad vent key, when you get a full stream of water close the vent walk back to the boiler check the pressure should be the same 12 to 15 psi. repeat this action going from the bottom floor to the top floor until you have vented every Rad in the home. when your done turn on the electricty. fire up the boiler and the pumps check to make sure all Rads are heating grab a beer kick off your shoes and enjoy the tube --Best Wishes J.Lockard
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