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1 replies

noisy start up

Posted on 23/12/2013 12:36pm

our system goes through a 4-storey house from the basement. When it starts up there is a lot of noise - I think from gas/air in the pipes. Sometimes this triggers a hammer effect in the radiator thermostat valves which then make a loud buzzing noise.

There is one air release trap on the top floor. Do we need to fit another or is there a better answer?

1 Replies
  • AndyW_JagaUK
    Commented on 23/12/2013 4:20pm

    There are a couple of things that can cause noise during start up, and running.
    1. Expansion
    As copper pipe heats up it expands, and can cause a creaking noise. This same noise will be heard when the system cools down as well. This might be at the start and end of the programmed time, or during system boiler cycling.
    2. Air
    Air can cause noise in the pipework. This is the sound of rushing water, similar to a water fall or stream.
    3. Valve orientation
    If a TRV is piped the wrong way round, this will cause a hammering noise to come from the valve. This is normally rectified by adjusting the TRV head, but is only a short term fix until the next cycle.

    The air is the easy one to sort out. You will need to vent from all of the radiators and the pipework. This needs to be done at every point where the pipework rises, and then falls again as the peak will always cause an air trap.

    Expansion and valve orientation is more difficult. Expansion can only be overcome by installing some expansion joints in the pipework and valve orientation can only be rectified by swapping the flow / return connections at the valve point


    Andy Williams
    Jaga UK

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