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I have a Coleman Evcon Presidential Gas furnace and I am looking for wiring diagram for the box with relays. Model #7900A6021

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  • Karmen
    Karmen Nov 08, 2014

    I have googled it and I cannot fnd a diagram for this. The model #7900A6021

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Try colman web site if not search images on bing or google.

Posted on Nov 08, 2014

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Sounds like it isn't getting a call for heat. If you have a digital thermostat it could be the problem. I have seen them look like they are working but burn out. A simple way to check is take the stat off the wall. There is 2 wires. It's low voltage so don't worry about shock. Touch and hold them together. If it fires up change the t stat. On a . 2 wire it makes no difference which goes to W or R

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If it's a blower motor, then the contacts on the relay is welded shut and has to be manually opened.

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