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I have a Weil-Mclain coal boiler, circa 1946. The system is also connected to a new oil boiler. First off, I have recently replaced the old coal boiler with the Weil-Mclain. Even with the old boiler, I've always had a problem with erratic and excessive pr

AskRed
asked this on September 01, 2012 05:38 PM

I have a Weil-Mclain coal boiler, circa 1946. The system is also connected to a new oil boiler. First off, I have recently replaced the old coal boiler with the Weil-Mclain. Even with the old boiler, I've always had a problem with erratic and excessive pressure buildup in the system, causing frequent pop-offs. The Weil-Mclain does not appear, thus far, to be a suceptable to this occurance, however, it's getting close. The expansin tank I have is the old style, non-bladder, type. The "T" off of the main line to the expansion tank is coming off horizontally from the line, to the expansion tank, with little or no rise to the tank. Could this cause the tank to be water logging (which it is)? Any reccomendations would be appreciated. Also, this system is only about 8 years old. My last question is, what is the purpose of a flow control valve and the proper method of adjusting same, if it can be adjusted.

 

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AskRed

A standard compression tank always requires a special "Airtrol Tank Fitting" to prevent the waterlogging problem. See your Bell & Gossett dealer to get one of these. You will have to know the diameter of the compression tank to get the right size fitting. A Flo-Control is simply an anti-gravity flow check valve. There is not adjustment, since the valve stem is turned all the way down for normal operation, or all the way up to drain the system or allow gravity circulation.

September 01, 2012 05:38 PM