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Posted by GAP on December 14, 2006 at 18:07:04:
In Reply to: Re: Why two pressuretrols? posted by HeatPro on February 18, 2006 at 14:03:11:
The reason for two pressure switches is for safety. That is why one is set at a higher limit than the other one. If the first one fails to cut off the gas for whatever reason then the high limit will kick in. If that fails then the pressure relief valve will protect the boiler from exploding.