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.
Can anyone explain to me why reversing the polarity affects the furnace in that way?
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!
Thanks for the link. That chart for the µAmps will come in very handy.
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?
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!