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Buzzing gas boiler

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billybongo
billybongo Member Posts: 6
in Gas Heating
My 1970's gas boiler is making an intermittent buzzing noise.

This is only whilst it is heating up/operating.

I have uploaded a video of it here - https://youtu.be/0xKV4vOvr2w

Any suggestions much appreciated!

Comments

  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,002
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    Most boiler buzzing seems to come from the relay which in your case, sits under the transformer. Less often, it comes from the gas valve.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
    HVACNUTDZoro
  • HVACNUT
    HVACNUT Member Posts: 5,835
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    Its likely the coil for the relay.
    It's also likely your boiler wants an appointment with Dr. Kevorkian.
  • billybongo
    billybongo Member Posts: 6
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    hehehe thank you for the replies. I may let nature take it's course...
  • billybongo
    billybongo Member Posts: 6
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    I have had a quick look for the relay serial number and nothing for sale.

    I'm finding similar Honeywell relays. I need 40 VA and 27 Volt secondary. Would a relay with 38VA and 26.5 volts do the job?
  • DZoro
    DZoro Member Posts: 1,048
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    Sometimes if you move/push on the relay box or the relay itself (remove cover) you maybe able to make the sound go away.
    That is also known as a fan center. I'm not sure if it is a dpdt, or a spdt, or other. If that is just controlling the burner, the 38 or 40va is fine. Description should be on the paper attached to the cover if you still can read it.
  • billybongo
    billybongo Member Posts: 6
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    Ah thanks for the tip. I will try that tomorrow.
    The paper label is legible but no word on the poles.
    Maybe I can find just the relay if there is any part number on there when I take it off. Too late and chilly for that tonight!
  • billybongo
    billybongo Member Posts: 6
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  • billybongo
    billybongo Member Posts: 6
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  • HVACNUT
    HVACNUT Member Posts: 5,835
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    You can use what's called a
    Fan Center Control Relay.
    It's a 115v primary, 24v, 40va secondary and is attached to a 1900 plate that will fit on the existing junction box.
    Connect R and G to the thermostat and a N.O. -| |- Contact on the relay for the burner circuit. Follow the schematic, and when done, try it with the gas off first.

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