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Posted by HeatPro on May 31, 2006 at 10:52:02:
In Reply to: Re: could we have combustion problem? posted by Dave on May 31, 2006 at 10:39:52:
That shows that there is more likely a hot spot in the exchanger to make steam and collapse. Pressure readings of the gas at the manifolds would tell if there is overfiring to make this happen. Reduction of the pressure could make it go away. Your heating last year shows that you rarely need high fire to make up for temperature loss in the house. Consider resetting the pressures to lower values, perhaps 100,000 and 200,000 (clocking the gas meter) so the second stage is needed more often in the coldest weather. Consult the Lochinvar factory reps on this problem; they should know this is happening when you have adequate water flow for a 20F rise.
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