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Where do I hook the two wires from me air conditioner to my new gas furnace? In line? (furnace terminal to wire from thermostate) Power to ground? Power to terminal?

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If you are talking about the two wires that comes from your air conditioner outside, they will be connected to your "Y" and "C" on the terminal board of the furnace.

Posted on May 28, 2011

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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

Have an Intertherm thermostate in mobile home controlling gas hearing and elec ac. Blue wire to thermostat connects to the "A" terminal on the thermostat...Blue wire goes to a terminal on the...


If there are only two wires going to the thermostat? Then you will not be able to use a Digital Programable stat. Intertherm and Coleman furnaces do the switching different than regular furnaces. They use the switching from heat to AC at the furnace with the rocker switch. They use the thermostat to either break the connection or make the connection. They use a heating only thermostat.... Hope this helps

Jan 02, 2011 | Intertherm P3RA-048K Air Conditioner

1 Answer

I am installing a totaline progammable thermostat, the old one is a rheem, i hooked the b wire to the b terminal the r wire to the r terminal the g to the g terminal and the y to the y terminal the e l and...


First off, make sure that the wires you are connecting at the thermostat match the circuit board of the unit. It is good practice, but not always followed to do a "1 for 1". To answer your question, W2 is simply when there is 2-stages of heating. If your furnace does not have 2-stage heating, then leave it empty on the t-stat. "C" is common. Common is neutral, so it should have continuity to the ground or L2. If your old stat did not utilize this, I wouldn't worry about it, unless the new stat is a touchscreen and constantly lit stat. Just keep this in mind. W-warm (heat), Y-cooling, G-fan, R-hot (main 24v power from furnace to thermostat), C-common (not always required), AUX (auxillary, if there wasn't one used on your last furnace, I wouldn't worry about it.). X may have been a common, or a dead terminal.
Bottom line, if you open your furnace to see the circuit board and where the thermostat wire connects, and match above, you should be just fine. Make sure you turn power off prior to opening the furnace, and when landing the wires on the stat. You could inadvertently blow the 24v transformer.

May 08, 2010 | Heating & Cooling

1 Answer

From the Isolator panel, how do I connect the condenser, and the blower?


MOST UNITS NOT HEAT PUMPS  WIRE UP WITH 2 WIRES TO CONDENSER RED WIRE AND WHITE . WHITE GOES TO COMMON C ON FURNACE AND RED TO Y TERMINAL OF FURNACE Y ALSO GOES TO Y ON TSTAT. BOTH YELLOW WIRES MUST MEET AT Y OF FURNACE.  WHITE FROM STAT TO W   GREEN FROM TSTAT TO G AT FURNACE IF YOU HAVE C ON TSTAT HOOK UP BROWN WIRE OR BLUE FROM COMMON TERMINAL WHERE YOU HOOKED UP CONDENSER WHITE WIRE AT FURNACE TO TSTAT , MOST THERMOSTATS DONT NEED C RUN FROM FURNACE. THE TWO WIRES GOING TO CONDENSER IS -  AND + TO ACTAVATE CONTACTOR IN OUTSIDE UNIT

Apr 19, 2010 | Ruud Central System Air Conditioner

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.
Sincerely,
Paul Gibson

Mar 31, 2010 | Heating & Cooling

1 Answer

My problem is....On my new Honeywell RTH230B thermostat the color code is Rh, Rc, W,Y and G. My wire colors are red, orange, blue, white and black. I can obviously match up 4 of them but where the heck...


First you are using abnormal wire colors for a furnace. Second.... if you have an air conditioner hooked up to this furnace, you will need to install a jumper wire between rh & rc. I am assuming this is a natural gas furnace. Usually the red wire to R terminals. Usaully the white wire to the W terminal. Take the door off of the furnace. Find the thermostat wire connection in the furnace. What ever color wire is on the R terminal in the furnace should hook to the R terminal on the t/stat. Whatever color is on the W in the furnace goes on the W on the t/stat. Whatever color is on the G terminal in the furnace goes to G on the t/stat. And the Y in the furnace to the Y on the stat. and the G in the furnace to the G on the stat. Most applications use only the R, W, G, & Y ( always put the jumper wire between Rh & Rc)
Good Luck
Hvac Teacher

Mar 26, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

I'm trying to change the thermostat and hook up the wires but the heat does not turn on How do the wires need to be hooked up?


Here is the basic wiring diagram for a gas furnace thermostat

Red wire to R terminal
White wire to W terminal
Green wire to G terminal
Blue or Yellow to Y terminal


Jan 17, 2009 | Heating & Cooling

1 Answer

Replacing the thermostat, took the old one off without marking the wires. Hooked it up by color and we get the furnace when we put it on cool. wires are green, red, yellow & blue (ground wire)on the...


the normal wiring for stats is white=w=heat,red=r=24volts,green=g=fan,blue=c=common,yellow=y=cooling.
see what ties into your furnace board and match the terminals.

Aug 12, 2008 | Honeywell Heating & Cooling

2 Answers

Honeywell thermostat


If you have a forced air furnace with an air conditioner attached make sure you have a jumper wire between Rh and Rc. If the Bryant thermostat had a wire hooked up to C you do not want to hook this up to Rc. Just cap it off and put it back in the wall or disconnect that wire down in the furnace.

Aug 10, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Carrier Weathermaker gas 8000 will not ignite


1. check indoor unit wiring.
2 check sensar of thermostate.
3if not change thermostate

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