can hear water running in baseboard pipe

Old 09-09-07, 08:30 AM
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Question can hear water running in baseboard pipe

when heat is on we can hear the water running in the baseboard pipes. Is a new occurance. Is there air in the lines? Is the extrol tank needing to be replaced, have done that once already about 6 years ago. Have 2 zones. If it needs to be bled, at what end do we start bleeding at? I remember doing this when we first installed the system, going from one room to the next opening upa small valve on baseboard and letting the air out till water came and then closing it. Cannot remember if we started at the last bedroom, end of line, and worked backwards. or at the beginning of the line in first room. And this was before the 2nd zone was installed, which we did not take part in the bleeding of the system. It is close to heating time and need to fix before it gets cold.
Old 09-09-07, 10:03 AM
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You do indeed have air in the piping. Start bleeding at the vent nearest the boiler. You may have to do it more than once. Try bleeding first with the thermostat not calling for heat. After bleeding all the radiation, check the pressure on the boiler (should be 10-12# for a single story house), turn up the thermostat & listen for the running water sound.

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