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From the furnace what are the blue, white, green, red wires

From the furnace what are the blue, white, green, and red wires mean

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Here's a link to a wiring diagram which is pretty standard.
http://ingramswaterandair.com/images/HCD1%20AC%20Models%20Installation%20Manual.pdf
Color what it does terminal
Blue 24V common C
White to heat control (gas valve) W
Green manual fan operation G
Red 24V power to thermostat R
Yellow activates comp during cooling Y

Posted on Sep 27, 2009

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This is if you have gas furnace and central air conditioning.
Normally this is the way.
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White wire to W
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Blue wire to C
If you want to check, before you connect to stat. Connect red and white (heat should come on)
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Hi Proper way on wiring furnace.


I can give you a start, For heat only, R terminal on furnace to Red wire to R or RH terminal on thermostat. W terminal to White wire to W terminal on thermostat. G terminal to Green wire to G terminal on thermostat. This will get you heat but not air conditioning.

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Try this.

A T-stat.

Orange = O
Red = R (with existing jumper)
Black = C
Yellow = Y
White =W1 (Or AUG)
Green =G

At airhandler/furnace.

Green = blower wire (usually green, double check with schematic)
(Green should not go to the HP.)
Orange to HP
Red to red and to HP
black to blue (or C) and to HP
White to W
Yellow to HP. (It may also go to a "float switch" if installed. but that will just be a safety switch on the drain pan in case the line clogs and it overflows.)

The green is typically used for the blower motor. (furnace only)

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Blue is typically used for common (or "C") but they may have changed it to black due to a broken wire, or other problems.

The only wires going to the HP should be
Red
Blue/black
orange
yellow

Orange should not be going to the furnace at all.

HP wiring should be
Orange to orange or O
Red to R or red
Blue/black to blue or C
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