Re: Teledyne-Lars Boiler Hammering
Posted by Bill Panas on February 27, 2002 at 08:00:43:
In response to Re: Teledyne-Lars Boiler Hammering
: I had the same knocking problem with my Teledyne-Lars boiler when I first moved into a new house. I called a T-L service rep in and he explained that as the zone valve closes the latent heat in the boiler flashes the small amount of water to steam and causes knocking. The installer had failed to put in a normally open bypass valve to shunt a selected zone valve (this becomes the "dump zone"). This valve is energized in parallel with the gas valve. As long as the boiler (gas valve) is on the N.O. valve is closed and all operates normally. When the boiler shuts down the N.O. valve opens up and allows water to continue to circulate through the dump zone as it cools.

Lately, I also have the "whinning" that I believe you are having too. I haven't found a solution for that yet. Did anyone else?

: One possible problem with that type of boiler is when the pump shuts off before the burner and fire box has cooled down, the tubes will create steam and that can casue a loud bang, (and also damage the tubes). One other possibility is that the zone valves are closing too rapidly fo the water velocity going through them and causing a water hammer.

: : Hi, Two years ago I had a Teledyne-Lars boiler installed in our home. Our home is a three level home with three seperate zones. Ever since the furnace was installed during the winter it causes the pipes to hammer just as the boiler is shutting off. We also hear a noise occasionally that sounds like a Cessna plane overhead that lasts for several minutes. The installer has thrown up his hands, he has backed off the pressure in one zone and I continue to get air out of the four release valves near the boiler. My wife is a light sleeper and this keeps her awake. Help! Any ideas?

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