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  1. Reducing water pressure of the heating system

    HVAC
    Hello, I have a Dunkirk XEB-6 furnace. First, the pressure was a little bit high around 25 psi. The manual said that the pressure should between 12 and 20 psi. I thought that the relief valve is not working. so i went ahead and tested it by lifting the lever and releasing some water. after...
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