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Need wiring diagram for Evcon 7990-368 thermostat

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4 Suggested Answers

The HVAC Guy
  • 30 Answers

SOURCE: We changed our thermostat to

the wire for the fan should be labeled g inside the furnace/ac and is likey green in color. this wire should be on the g terminal in the tstat

Posted on Oct 30, 2008

SOURCE: Colman evcon ''B'' relay connection on new programmable t/stat

Hello The B wire now goes to the O termnal on new thermostat.

Posted on Apr 03, 2010

hvac1960
  • 2133 Answers

SOURCE: How do I know if

It's 24 vts (Low).

Posted on Jan 09, 2011

hvac1960
  • 2133 Answers

SOURCE: is my thermostat low, or high voltage for coleman

Its 24 Volts.

Posted on Jan 09, 2011

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1 Answer

My Coleman Evcon furnace Model EB 12B will start out blowing warm air and then before it reaches the temp set on thermostat starts blowing cold air. We had the thermostat changed over the summer and the...


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Did you check to see if you have power or fuse blown? If it is a furnace/ air handler and you are comfortable with electricity. Turn
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1 Answer

I have a Goodman A/C unit model # GSC130361F A and a Evcon


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Colman evcon ''B'' relay connection on new programmable t/stat


Hello The B wire now goes to the O termnal on new thermostat.

Apr 03, 2010 | Coleman Air Conditioners

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I assume this is a manufactured home, this is probably a two transformer system, either your contactor is welded in the on positon or wyou have control wiring issues, (could be the thermostat)

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2 Answers

Wiring Diagram


here is a basic wiring diagram for all air cond systems your thermostat consist of treminal r w y and c run a four conductor wire fromm thermostat to ai handler the air handler should allso have eather have red blue white wires or a teminal block marked r w c r stands for red w for white c for comon allso blue run color for color from the thermostat to ai handler with exeption of yellow yellow runs straigth to condenserand retuns in white wire to air handler wich gets conected to comon hope this help[s you

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