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  1. #1
    Join Date
    Mar 2005
    Posts
    65

    Exclamation

    Ok, so it is my first install of a GoodMan gas furnace & evap cabinet, and I believe it has a white rodgers control board?!?! well anyway, I finished the install and went to test the cooling. Everything went fine! Heat is a different story.I guess after wondering for about 1 1/2 hours why the unit cools but doesnt heat I called a supervisor, he came and told me that the gas valves will not run if the polarity of the current is reversed, the circuit board ceases to operate the heat.

    lesson learned!

    Can anyone explain to me why reversing the polarity affects the furnace in that way?

  2. #2
    Join Date
    May 2004
    Posts
    12,002
    It is called FLAME RECTIFICATION...


    Read about it here

  3. #3
    Join Date
    Apr 2004
    Location
    Midwest
    Posts
    2,682
    Originally posted by lusker
    It is called FLAME RECTIFICATION...


    Read about it here
    That’s a good link Lusker, one of the better explanations I have read.

    I would bet most techs don’t understand flame rectification.
    Live each day like it is your last, for one day you will be right!

  4. #4
    Join Date
    Sep 2003
    Posts
    1,311
    lusker,
    Thanks for the link. That chart for the µAmps will come in very handy.

  5. #5
    Join Date
    Oct 2004
    Posts
    3,400
    Look closely at any flat extension cord or even a cord for a table lamp.
    One of the wires will have a rib, or series of ribs, molded into it.
    That's your neutral.
    That side hooks to the white wire in the furnace.

    See if there is any mention of polarity in your installer's guide.

    You did read it, didn't you?

  6. #6
    Join Date
    Mar 2005
    Posts
    65
    unfortunately the unit was already unwrapped and prepped before I got to the job by a coworker, and he said that the paperwork was misssing from the unit. I have since obtained a copy and read up on this flame rectification!

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