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  1. #1
    Join Date
    Nov 2009

    Question Replacing water in the boiler

    I had a leaky seal that I replaced on my recirculator pump. I drained the water from my system and everything went pretty well. There is no leak anymore and the pump works fine. The issue I have is filling the system back up with water. I open the cold water supply valve and filled the system. When I did that the pressure relief valve popped due to the high water pressure. It released a lot of water. Now that I am using the system, I hear the water filling my baseboard units every time the pump comes on. I replaced the pressure relief valve with a new one. Should I simply bleed the air out of my baseboard units? How do I know if there is enough water in the system?

    Any info is appreciated.
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    Last edited by sclowry; 11-02-2009 at 11:20 PM. Reason: added icon to indicate question/mispelled word

  2. #2
    Join Date
    Feb 2008

    Default Re: Replacing water in the boiler

    Yes, when you drained the system & replaced the pump seal, you introduced some air into the system.

    This is what you're hearing sloshing around in there---start with the HIGHEST baseboards and bleed them first---air in piping will always gravitate to the highest point in the system---bleed them first with the system off.

    You should hear air escaping as you open the little bleed valve, then a small stream of water---hold a cup under the valve (or a wad of paper toweling) to prevent wetting the flooring.

    The valve at the boiler that lets in fresh water (usually automatically) from the main supply is known as a Pressure Reducing Valve, and is set to allow approx. 12 psi of water into the system---keep an eye on the boiler gauge---it should read ~12 psi when the system is cold or warm and up to ~20 psi when the system is heating up---the relief valve that you found out about with water dumped on the floor is designed to open at 30 psi as a safety valve to protect the system from too much water pressure.
    Last edited by NashuaTech; 11-03-2009 at 12:06 AM.

  3. #3
    Join Date
    Nov 2009

    Default Re: Replacing water in the boiler

    That did the trick. Thanks for your help.

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