Gas Fire Hot Water Boiler Whistles


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Old 02-23-07, 06:32 PM
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Smile Gas Fire Hot Water Boiler Whistles

Hello , New Guy to forum.
I have a Utica AGB 125 hot water boiler. It whistles on High fire. It's driving the wife crazy. You that's a work order thats the highest priority.
Background last fall the gas company changed the meter. May or may not have anything to do with this. We had a very warm November and December and I did not notice the whistle .
I did have my furnace tech come in in November to do a check of the system.
What did do and this helped was to close the main gas valve to 75 to 80 % open and the whislte stopped. Still getting blue flame .

I would like some ideas of why this is occuring.
 
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Old 02-23-07, 08:04 PM
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Wink

What did do and this helped was to close the main gas valve to 75 to 80 % open and the whislte stopped. Still getting blue flame .
Id say thats a NO NO for sure. Id call the gas company and have them check the W/C ( thats the psi) on that gas line for sure
 
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Old 02-24-07, 06:10 AM
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By partially closing the gas valve you have effectively limited the maximum gas flow to the burner. The whistling is caused by high velocity gas flow and could be a result of the change out of the gas meter to a smaller flow-rated unit OR it could be a malfunction of the gas pressure regulator.

Did this problem occur with the old gas meter?

Definitely call your gas company and have them check the line pressure after the meter and any supplemental pressure regulator owned by the gas company when the boiler is firing at the maximum rate with the valve you are currently throttling wide open.

If the gas pressure under this scenerio is proper then there may be a problem with the modulating burner itself that will require service.
 
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Old 02-24-07, 12:08 PM
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I think that it did whistle but ,I can't remember when they changed the meter.
One thing about this is that when the pressure in the sheet matal causes the top of the cover to make a thud that a stick on a drum when it goes to high fire. It's done that a long time and I thought it was thermo expansion and pressure of the fires moving the air .
 
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Old 03-24-07, 05:45 PM
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Gas Input

I found the set up instructions for the Boiler. The input was suppose to be 3.5 inches +/-.3 inches.
I made a Manometer and attched it to the 1/8 pipe inspection port of the gas manifold. The input measured about 4 inches. So I turn the adjustment counterclockwise as the set up instructed and the whistle stopped. Got it as close to 3.5 as I could. I haven't heard it since.
 
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Old 03-24-07, 06:29 PM
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Gas Pressure

The higher pressure was likely the cause of your whistle but by adjusting the gas pressure, you may have thrown the air out of proportion. You should get some one with the proper test equipment to come in & check it. You might be fine but you can't tell by eye.
 
 

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