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    saint cloud st's Avatar
    saint cloud st Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 13, 2008, 05:55 PM
    Cast iron radiator will not heat up
    Hi I have an old heating system(1910) in my home, I have four cast iron radiators three work fine
    But the one in the last level will not heat up. I bleed ed them all but the one on the third
    Level will not bleed. No air pressure comes out of the bleed valve. What should I do.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 13, 2008, 08:43 PM
    Check for proper system water pressure. Sounds like you do not have enough system altitude.
    therinnaiguy's Avatar
    therinnaiguy Posts: 153, Reputation: 5
    Junior Member
    		  
    #3

    Jan 14, 2008, 05:13 AM
    Your boiler should be running at between 12 and 20 psi. Check the gauge. Try increasing the pressure of the system temporarly while bleeding the farthest radiator by lifting on the feed valve lever. Typically this feed valve looks like an upside down ice cream cone with a flat piece of metal like a tail on the top. Lift the tab and you will hear water rush into the system. Get it up to 20 psi and then release the tab. Go and bleed that radiator and see if this helps. If not, you have a restriction in the radiator or a bad circulator. Try this a few times, it may help move the restriction out of the way.
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