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Bleeding Hydronic System

KeithP Member Posts: 1
I have a hydronic system with 4 loops, 2 downstairs, 2 up. 1 of the upstairs loops was not heating. I turned off the other zone valves and it then heated up.
I have now left the affected zone fully open and the others 50% open.
What could cause this?

Also the rads (baseboard) have 'automatic ' bleeders, with a tire type valve on the top, should these be pressurised or just left alone.

Apart from this its a brilliant system.


  • Dan Peel
    Dan Peel Member Posts: 431
    new system or new problem?

    The source of your trouble could be a piping error, circulator placement problem, air issues, bypass piping or a variety of similar causes. Best guess without seeing would be the circulator is too small, installed on the return and relying on balance across the 4 zone valves to induce flow. Your current solution of restricting flow for the 3 zones should enable the 4th zone to receive more of the flow. This may mask the problem but will not fix it. Enjoy....Dan

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