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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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This is a colemon evcon electric furnace for mobile home the blower work fine just won't put out no more heat any ideals


when the fan is operating, is the fan switch on the thermostat in "on" or "auto" position? if it\'s in the \'auto\' position, then the stat is calling for heat ok. if so, you should check the safety controls for closure...i.e., the rollout switches (if there are any) and the high limit control, you should also measure the voltage at the gas valve. if you have 22 -27 volts at the gas valve, and you have all upstream gas open, and you have gas available (not shut off by gas company), but still no fire, then you probably have a defective gas valve. otherwise, if you have a wiring diagram, it should be easy to find the problem.

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


The indoor fan should cycle with the outdoor part, make sure the thermostat is not set to fan "ON" and if the fan is on "AUTO" it could be a wiring issue or a fan relay that is stuck.

May 28, 2010 | Goodman CLQ36AR49 Air Conditioner

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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 Heating & Cooling

1 Answer

I have a coleman Evcon model AH16-0 . I am


Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

Jan 06, 2010 | Heating & Cooling

1 Answer

I have a coleman evcon gas furnace I want to change the termostat to a programmable thermostat I don't know where the wires hookup we have four wires red,white,yellow,green. I have a honeywell RTH230b...


The thermostat has terminals which are marked for color, R = red, W = white, Y =yellow, G =green. There should be a jumper between Rh and Rc, Hook the red to Rh.

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Wiring from thermostat to furnace


Typically you normally will have five wires controlling your furnace and airconditioning. R Y W G C. If you get some thermostat wire. Connect them like this---- red wire will go to R(this is your 24V to thermostat)----yellow wire will go Y(Y is your cooling)----white wire will go W(W is for heating)---green wire to G(green is your fan)---black can go to C(this is your common to supply 24Vto thermostat)

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