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drhvac

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drhvac
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  • Combustion question

    Approximate readings before and after gas pressure was adjusted. What's better? Before Gas pressure 3.6 Stack 295 Co2 6.34 O2 9.2 Co 9ppm After Gas pressure 4.25 Stack 325 Co2 7.4 O2 8 Co 10ppm This … (View Post)
  • Re: flame sensor

    I did not get the make of the board, but no there's only 2 wires to the unit, and they are using the casing of the bx as the ground. There is a junction box somewhere buried because out of the panel … (View Post)

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