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I am looking for a wiring diagram for a basic outdoor ac unit. I have run across a mess of wires disconnected inside a unit. Mainly looking for a diagram explaining what wires go where on a two pole contacter ( to it and from it)

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See Page 7 of this Installation Manual of a basic condensing unit. There was no reference regarding the phase of the unit. This manual shows single and three phase. Hope this is very helpful to you. :-)

Posted on May 06, 2010


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I'm looking for a thermostat to replace my simple comfort 2200 it has 7 wires across B O W2 G E Y1 Y2 and 3 wires vertical R C L I'm looking for a thermostat to replace wire for wire. can you help??

What you have is a 2 stage cool/3 stage heat pump compatible tstat. And I'm guessing by the info you provided that the wires "across and vertical" are 2 sets of wires that are running inside the wall to your indoor unit. As if they didn't have enough wires and run an extra. We normally run 1 control wire with 5,8,10.or12 wires inside. And there should only be a wire connected to B or O, not both? Again I'm guessing. If I'm correct, then any "2 stage cool/3 stage heat" tstat that is "heat pump compatible" should work. I'm also assuming that you have wires connected to B or O. Now if you have a wire connected to both B & O, best call out someone to change it for you because that's different than I've ever seen. Also, the L is a wire used from the outdoor unit, and sometimes both indoor and outdoor, to communicate with the thermostat when something's wrong. Most multi-stage tstats will have this but you'll need to check/ask before you purchase if you want this feature. Also, after you install, be sure to configure the new that to match your system. Hope this helps!

Mar 06, 2017 | Heating & Cooling

1 Answer

What could be causing my HVAC secondary circuit to keep blowing a fuse after the AC Compressor ran for 10 hours?

Yes its a short. I've seen a weakening component cause that but 99% of the time its a short. Look where your control enter your o.d. unit. The wires can rub on the metal where the small hole is for the wires to go through. If your o.d. unit has any low voltage wires inside where the piping to the compressor are, look there. A low or high pressure switch may be installed and the low voltage wires inside can rub on a copper line causing an intermittent short. Look anywhere a low voltage wire can touch anything , other than intended points. If its a component then you may end up with new parts all over and still have a short. The control wires can get damaged by varmits in the attic, crawl space, and where the wires go through the wall or sophet. To isolate it may take a pile of fuses or a transformer with a micro-breaker can be installed. Basically has a 3-5amp micro breaker that trips and can be reset. If you were to remove all control wires leading to the o.d. unit, start the cooling, and it shorts then your short is not at o.d. unit. With o.d. control wires wired in at the ahu, disconnect the low voltage wires from the o.d unit. Cycle cool and if it shorts, the wire between is the cause. If it don't short, then you know its at the o.d. unit. At the o.d. unit, if it has any low voltage safeties(low pressure, high pressure, delay timer, ect...) you can maybe bypass all to allow the contactor to be the only component wired in the low voltage circuit at the o.d. unit. And if it shorts keep chasing it. Bugs and geckos can get behind circuit boards causing a short. Ants in any components can cause a short. Hard to help more from here. Above all, work safe!

Jun 22, 2015 | Heating & Cooling

1 Answer

Have a AC unit working for two years great all of a sudden outdoor unit stops push the contactor in and outdoor fan and compressor come on but will not stay on have 24 volts and fuses are fine any ideas

Most likely you have either a low or high pressure cutout switch that has shut the unit down. One will be located on the suction line (larger tube) the other on the high pressure line (small tube). If you have both high & low shitches they are tied together in series and in order to bypass them you need to trace them back to the contactor . Pull cutout switch by the unit to disconnect power. Do NOTHING inside the box with power on. You will see they tie together somewhere and each one has one end attached to the contactor. Mark which wire goes where and remove these. This will put those sensors out of the loop. If only one sensor then both wires will go the contactor, one on each side. Turn unit back on and see it the compressor starts up. If so then you need a tech to re-charge or diagnose problem. If not, make sure temp inside is set low enough for compressor to turn on. Still noting, then it most likley your thermostat. Need volt meter to check this and better to not mess with the wires as this can really mess things up. At some point you will most likely need to call a tech anyway as you need to be licensed to buy freon and will be required if low charge is indicated.

Apr 22, 2013 | Heating & Cooling

1 Answer

New heat/ac installed oct 09 by friend/family members..started using air last week..noticed it wasnt its 84 in home-NO cold air blowing. what in the world did they do wrong on install?

Hi, it sounds as though when they did the install, they may have a poor brazed joint and the unit lost its charge while setting until now. If the indoor unit runs and is blowing just air, go to the outdoor unit to see if its running. If not the problem is out there. If its off, check the breaker to make sure it is on. They should have also put a disconnect box at the condenser out side. It has 2- fuses inside behind the plastic cover that you can check. If it has power to it, its probably lost its charge and its off on its low pressure switch. Its a small switch brazed to the larger of copper lines inside where the compressor is located and will have 2-BLUE wires coming off the top and is also BLUE in color. There is a high pressure swith that is RED that looks the same so dont confuse them, go by color. You can jump across the 2 with a jumper wire leaving the wires inplace, just move the conectors up to clip onto metal. If its off on low pressure it will start. Don't run it!!This is just to check it. Get back to me to let me know what you have found and if the outdoor unit was off or on.

Jun 06, 2010 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Ac unit breaker trips off

First thing to do turn off the breaker in the electrical panel, then open up the AC outdoor unit, including the disconnect box, that should be mounted on the wall near the outdoor unit. Go thru and tighten all of the screws and wire nuts, look for burnt wires, while you are at it.
Turn on the breaker and try again, if it still trips, then we look deeper;
pull the control panel off the outdoor unit and look for the contactor, this is where the power coming into the outdoor unit hooks up to. There will be a set of contacts in the control, check it out and see if the points are badly burnt,
If all off the wire checking still has not helped, it will more than likely be a bad condensor fan motor or a compressor, the compressor is the big black thing in the bottom of the outdoor unit, making sure that all power is turned off, pull the plastic cover off of the side of the compressor, there will be 3 wires, make sure none of them are burnt and touching the metal, if they are, repair the wire and test.
Try this and if you need to know how to troubleshoot to see if it is the fan motor or the compressor, just contact me back.
If this has been helpful, please rate me.
Contact me if I can help you any more.

Apr 10, 2010 | Goodman CKL24AR24 Air Conditioner

1 Answer

Thermostat wires running from house to outside Kenmore AC unit were chewed by dog. Got replacement wire. Took panel off. There were three encased wires running into AC unit that were chewed. Only see...

If you have a central air conditioner, or a split system, where the indoor unit is attached to the furnace and a outdoor unit is located outside of the home. 2 copper lines will be connected to it, a larger and a smaller one. If it is a air conditioner and not a heat pump, the A/C usually uses 2 wires, that are connected. Allot of times a installer will use a 3 wire thermostat wire, to run to the outdoor unit, if this is the case, the third wire will be folded back out of the way.
The color of the wire is usually picked by the installer, I myself usually use white and red and fold the green out of the way. If you only had 2 wires hooked to it to start with, it really would not make a differace which one you hook up to either one of the yellow wires.
All you are doing it having one wire coming in and one wire leaving,,,, just creating a complete circuit, just don't connect the two yellow wires together.
Example: If you have 2 yellow wires on the A/C unit and 2 wires coming from the house "example a red and a white" hook the white to "One yellow wire" and the red wire to "the other yellow wire".
You are just creating a complete circuit, when the thermostat calls for cooling, it creates a magnetic pull and closes the contact points, in the air conditioner, outside, this allows the 220 volt to flow to the compressor,,, and ahhhh cooling!
I hope I have not confused you, I am just starting to help on this site and still trying to make things understandable.
Wish you the best,
Paul Gibson

Mar 29, 2010 | Heating & Cooling

1 Answer

I purchased a 60-Amp Cutler-Hammer Fusible Pullout Air Conditioner Disconnect to replace my older (over 20 years) one for my AC/Heating unit inside the house. Looking for a wiring diagram as I have 2-wires...

The two wires coming from the breaker box go to the terminals marked "LINE". The two wires going to your AC unit go to the terminals marked "LOAD".

Hope you find this to be very helpful. :-)

Mar 22, 2010 | Heating & Cooling

1 Answer

I have a RUUD AC Model UPFA 060JAS, Serial # 3687 F4787 3195. My dog ripped the wires apart on the outdoor unit. Wire coming out of the house (6) are colored red, blue, white, green brown, and yellow. ...

Paul, you will need to look at the indoor unit and determine which wires from outside are connected inside. let me know. more then likley they color coded it but better to be safe. also does the fan inside still run if you switch thermostat to fan ON. if not the transformer may have blown, if yes you need to make sure you shut the breaker controlling the inoor unit off while your messing with the wires, or you will blow the transformer in the furnace


Sep 26, 2009 | Heating & Cooling

1 Answer

Panasonic cs-pw9gke i need wiring diagram

Split A/C-Cold:

You need four wires(two #10 and two #12) to the outdoor unit, leaving you house, and three wires(#10) coming from the breaker to tye indoor unit inside your house.

Split A/C-Cold and Hot:

You need five wires(two #10 and three #12) to the outdoor unit, leaving your house, and thee wires(#10) coming from the breaker to your indoor unit inside your house.

This ypical arrangment(all of them use three wires fro the breaker), yet there are other units which may require 6-7 wires connected to the the outdoor unit depends on the added features to the unit.



Dec 05, 2008 | GE Quiet-Aire Ductless Split System Air...

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