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How do I hook up the AC to this furnace circuit

How do I hook up the AC wires to this furnace circuit board. Model # GF8150D20UH11A. Also where can I get a manual. What type of thermostat should we use.

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Do not hook up line voltage to board. must first go from transformer to board.most boards operate on 24v

Posted on Jun 25, 2009


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How do i bypass the furnace and still use the duotherm 57915.531

Do you have the digital thermostat? You can tell the thermostat you have no furnace. You should be able to disconnect power at the furnace, but the 12v power for the circuit board is provided by the furnace circuit on some systems so make sure you disconnect the wire going to the furnace and leave the wire feeding the circuit board.

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Nordyne model FEH-017HA-04 furnace...the fan comes on full force with ac but not when furnace comes on

On newer furnaces the fan starts in a period of time factory set and is initiated by the control board. The air conditioning fan is started by the thermostat and starts right away when the stat calls for cooling. You will need a tech. familiar with this model and carrying the right parts to look it over. Does the furnace fire and then shut off in a few minutes? If so, it is most likely to be the board. Sorry. It may be pricy.

Oct 24, 2013 | Electric Circuit Breaker Kit for Furnace

1 Answer

Never got an answer to ? on a new goodman board #B1809913S. I want to know where to hook up the a/c circuits, yellow for t-stat =cool, and the cond wires. there is no terminals on the board for these...

Most of the time you would hook it up to Y on the furnace terminal strip. G would you to G which is Fan control....... But if you don't have a terminal on the furnace you can hook up the yellow wire from the thermostat Y directly to the condensor wires from the AC and the other wire from the condernsor to C common ternimal........ just make sure that the blower fan comes on with the AC or it won't cool.

Jun 26, 2011 | Heating & Cooling

1 Answer

How do u wire athermostat to the furnance and ac unit on model e3eb-015h nordyne

You need to get low voltage wire known as 5 wire. run wires thru wall to stat and furnace Red wire goes to R terminal white to W terminal Green to G terminal Yellow to Y terminal on both the stat and furnace circuit board. Now you need a wire called 2 wire low voltage wire run that from furnace circuit board to outside A/C. At furnace hook red wire to Y terminal and white to C terminal doesnt matter which ones you hook up at outside unit. Do it just like i told you this will work properly.
If this helps please rate me.

May 20, 2011 | Heating & Cooling

1 Answer

We have the intertherm E2EH-015HA. The AC Coil drain was plugged and the water over flowed and burned out all the wiring. The only wiring diagrams we can find do not show how to complete the circuit for...

The G terminal on the thermostat most go to the G terminal on the control board, so the green wire that is attached to the G terminal on the subbase of the thermostat must go to the G terminal on the intergrated control board on the furnace. I will post a pic of how the wiring goesrobhvac47_8.jpg

Jan 18, 2011 | Heating & Cooling

1 Answer

Have a Evcon model #GCGD36S21S2A Puppy chewed wired and now compressor won't kick on nor will thermostat turn on. Three wire system but looks like only white wire was hooked up. Nothing when rubbing white...

There will be 2 wires hooked up in order for the system to operate, the color of the wires are not really stanard, allot of installers will use colors of their choice, it usually is yellow and blue, but the only way to know for sure is to remove the thermostat from the wall and see what colors are hooked to the "Y" and "C:" terminals... then make sure that those two colors are connected to the 2 wires that are out in the outdoor unit - air conditioner, at the outdoor unit, it does not matter which color goes to the wires.
example: lets say the outdoor unit has 2 yellow wires, and lets say that the 2 wire that are connected to the "Y" and "C" terminals at the thermostat are yellow and blue, just hook the blue wire to one of the yellow wires that come out of the outdoor section of the air conditioner, then hook the yellow fron the thermostat to the other wire coming out of the air conditioner. All it is doing is energizing a coil in the contactor in the outdoor unit, like a light switch that gives power to the compressor. Now........
If the 2 wires coming from the thermostat were touched together, that would creat a direct short in the 24 volt circuit in the furnace - inside of the house, hopefully the model of furnace or air handle will have a spade type automotive fuse located on the computer board in the furnace, if so this would save the board from shorting out, so look on the board, find the fuse and see if it is blown, if so replace it with a automotive spade fuse of the same type, usually 3 or 5 amp. If there is no fuse it is a good chance that the 24 volt transformer of the board itself is shot - this will require a AC tech.
NOTE: Turn of power to the furnace and the A/C outside, before looking at anything. The thermostat wire to the out door unit is a 24 volt line, this is usually a pencil or smaller sized wire, "Brown" or sometimes "White".
I wish you the best, and hope it helps, I am new to this site, so I am still getting use to it.
Paul Gibson

Mar 31, 2010 | Heating & Cooling

1 Answer

I have installed Generalaire 1137 humidifier to an Goodman Furnace. Furnace Circuit board has 115V Hum terminal for black wire. should I connect the white wire to EAC terminal on circuit board as well.

The white wire needs to go to an "N" terminal. There are usually a number of white wires all in one spot and a bunch of "N" ternimals. Hook the white wire to any of the empty ones.


Jan 29, 2010 | Goodman Furnace Draft Inducer Blower ...

1 Answer

No water flowing to water panel but have water to the solenoid. I have a Aprilaire model 550. wondering if the solenoid is bad and how do I check it.

To test solenoid, apply 24V directly to the terminals as see if water flows through it. Alternativly, turn everything on, ensure that there is 24 volts accross the solenoid wires, if you show 24Volts and no water, solenoid is bad. To test you will need to set your meter to AC Volts.
If you have a separate black transformer supplying the 24 volts, hook that directly to the solenoid. You may also be getting the 24Volts from your furnace circuit board, if that is the case you will see two terminals usually marked HUMIDIFIER on the furnace circuit board (you will need to open your furnace usually 4 screws or so.) There is 24 volts there WHEN THE HEAT IS ON , run two new wires from those terminals to the solinoid and see if it passes water cuz that is when those terminals have voltage. Best way is with a meter though and if you have 24 volts at the solenoid AND no water, it is bad. If NO VOLTS, then could be the the humidistat or a disconnected wire somewhere in the path.

Dec 26, 2009 | Aprilaire Humidifiers

1 Answer

I'm replacing an old thermostat with a new Honeywell RTH6300B programmable. I have propane heat and central AC. My old thermostat has a black, a red and a yellow leads with no ID on the old thermostat wall...

Open up the propane furnace and see what color wires are hooked to the gas valve or circuit board. If it has a circuit board, note which color is on the R terminal and W terminal, Connect the the thermostat the same way. Most likely the yellow wire powers your A/C so you can hook that one to the Y terminal.

Nov 27, 2009 | Honeywell Programmable Thermostat Heater

1 Answer


In order to hook this up to the fan on your furnace, you will need to either have or install a Fan center @ the furnace. (Unless it is gas, and has a circuit board that will simplify the process) All this is, is a transformer, a relay, and a set (or two) of NO and NC contacts. You will need to run 3 wires from the thermostat back to the furnace, if you do not have them already. If you have a gas furnace with a circuit board then all you have to do is connect the three wires from the thermostat to the board. (R to R; W to W; G to G. If you are using an older furnace, or a oil fired appliance, power should go out of the transformer (secondary side) to the thermostat on R. It should then come off W and another wire off G back to the furnace. Connect to the appriately marked terminals on the fan center. Hope this helps

Nov 19, 2009 | Honeywell International Honeywell&...

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