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Thread: Radiant Ceiling Heat

  1. #1
    DIY Junior Member loners4me's Avatar
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    Default Radiant Ceiling Heat

    I have a Capitol gas boiler...old bugger. 90000 btu, series # 5-11 with a bell & gossett pump and each room has its own regulator. Well some rooms are hot and others are cold. These valves are highly corroded and Im afraid cranking on them might do more harm than good. If these things do move which way allows more/less flow? My drunk plumber friend told me this would be an expensive part to replace and not to touch it....
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    DIY Senior Member Smooky's Avatar
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    Lefty loosey righty tighty
    In other words
    Turn it clockwise to close the valve and counter clockwise to open the valve.

  3. #3
    DIY Junior Member loners4me's Avatar
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    I am able to turn some of these screws but not sure anything is happening. One screw I kept twisting counter clockwise and it seems to just keep turning. Could the plunger or whatever is inside be old/stuck? Is there any rubber in these or just metal? The original reason Im even messing with it is because my living room just stopped getting warm overnight. No adjustments made in the 5 years I lived here and all of a sudden the ceiling in living room doesnt get warm but the others still work fine.

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    DIY Junior Member loners4me's Avatar
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    Here is a close up
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    DIY Senior Member houptee's Avatar
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    Maybe air is trapped in the loop for living room so you get no flow?
    Is there a way to bleed each circuit on the return manifold? I assume this is the supply manifold in the pic or it could be the return since I see a boiler drain valve with no handle on it?
    You need to make sure water is moving thru each circuit.
    Normally on the drain valve you hook a garden hose to it and drain out the water and air, one circuit at a time, making sure the cold water feed valve is allowing new make up water into the system as you let the old water out of the system.
    Maybe check your cold water feed valve/backflow preventer/and pressure reducing valve assembly is not all clogged up with sediment.
    You probably have low water condition in the system.

  6. #6
    In the Trades Tom Sawyer's Avatar
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    Best advice, call in someone that is schooled in radiant heat and has experience with older systems like yours. Your drunk plumber friend is correct in that messing with those 50+ year old valves will most likely lead to leaking packing that you won't b able to stop.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  7. #7
    DIY Senior Member houptee's Avatar
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    I think those valves are basically just a gate type flow valve and the nut is just a locknut, so they would just spin around forever and not tighten if u loosen the nut. You use the screwdriver slot to determine if it is full open position or full closed then lock it with nut.
    But like Tom said once you disturb them after all these years they are going to leak most likely.
    Take a pic of the other manifold and the cold water supply valves etc.

    I had this problem several times where the make up feed water was not flowing into the system due to the cold water feed valve/backflow preventer/and pressure reducing valve assembly was packed totally solid with crud.

    This is an example of what could be clogged up as well as the water shut off valve that would be in front of it.
    http://www.homedepot.com/p/Watts-1-2...1-2/202584235#

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