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Sealed system drawing in air

  • 02-10-2012 1:36pm
    #1
    Kencollins
    Registered Users, Registered Users 2 Posts: 567 ✭✭✭


    Hi all,

    My heating system was badly balanced and not running well. I had my plumber balance the system, and he advised me to convert to a pressurized system to remove the problem of air being drawn in.

    He did this for a reasonable price, and the heating system is definately running better.

    However, there is air in the highest radiator every time I check. It's not a lot, but enough to take 2-3 seconds to bleed out. The water that comes out is frothy at first and then it changes back to clear.

    The old vented system wasn't drawing in fresh water so I don't think corrosion is a problem.

    The new system has an auto-filling valve that maintains the pressure at 1.5bar.

    The question is, where could the air be coming from? If the water isn't being constantly being refilled or changed should the air have nowhere to get in?!

    The house is a 4 bed semi and I use the heating to heat hot water in the hot press. It is an oil fired potterton statesman boiler.

    There are no obvious leaks around the house, the pressure valve isn't leaking either.

    I do have the pump on setting 3. The plumber put it at that setting and said nothing about changing it! Could the high setting be causing the water to get agitated? If I turn it down to 2 would I need to balance the system all over again?

    Thanks,

    Ken


Comments

  • #2
    JohnnieK
    Registered Users, Registered Users 2 Posts: 2,526 ✭✭✭JohnnieK


    If you change the setting of the pump it could need re balancing. The position of the expansion vessel that he used to seal the system is important too. It should be put on as close to the suction side of the pump as possible to maintain positive pressure in the system. If a system is under partial or full negative pressure there could be air ingress through old valves and rad valves.


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