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What is a wire lug in my AC unit?

I got this advice from Protek 480 and the live chat with another guru determined the loose wires are thermostat wires. Protek480: It sounds like a 120 volt line coming in from the pole. Red is the hot wire, white the common or neutral wire, and the green ground. Hook the red and white to the two main wire lugs in the unit and the green goes to the frame or ground lug that will tie to the frame. I don't know what a wire lug is or where the main and ground LUGS are or look like. Thanks a lot for any help!

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A lug is defined as a screw terminal made to accept one or more wires. Lugs as such are found in Circuit Breaker boxes (and on the circuit breakers themselves) Electrical junction boxes, Contactor relays such as found in Central Air units, those all being fairly large. There are also small lugs as would be associated with small wires such as thermostat wiring. Terminal diagrams for user-made connections are always provided with the unit being connected be it thermostat or HVAC unit. The thermostat comes with written documentation including diagrams, HVAC units typically have a diagram glued to the inside of the access panel.

Electricity can be your friend but can also kill you. Disconnect the power before altering or making any connections. If you don't know what you are doing, don't become a statistic, get help.

Posted on Jul 12, 2009

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Need to find out why my honeywell rht4650d thermostat is reading "in recovery"


The problem is likely with the cooling system, not the thermostat itself. Either the message from the thermostat is not being received by the AC unit, the solenoid isn't turning on the unit or it can't cool properly.
First check that none of the wires to the thermostat are loose or broken. You'll have to take the face plate off to check. The conductors are very small wires and can break easily. Depending on the unit,there are 4-5 wires usually for a HVAC system. If a wire is loose, reconnect it (push it in or screw it down gently). If a wire is broken, strip (for screw terminals) a new section and reconnect it. Check for ice build up on the condenser coils. (That is often a sign of a refrigerant leak. You'll need a professional to fix it and recharge the unit.)
Do you hear the fan running? If you do, then the condenser is a likely culprit. If the fan isn't running, then the control board for the system may be bad. You may want a professional to check the system. If you tell them the make and model, the technician can bring the parts if it is a problem with the control board.

I hope this helps.

Cindy Wells
(We had the broken wires to our thermostat in the winter. A few years ago, a nearby lightning strike had the AC off in the summer due to the control board damage. The house reached 90 degrees while we waited for the repair.)

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1 Answer

Replacing the Contactor on my Rudd AC model uaka-037jaz. I got a Dayton 2utl4 contator for a replacement. I need to know which wires connect to what location. I hooked it up with the 2 thermostat wires...


On this unit wiring is very basic, line in wires to the two lugs on the bottom, common as refered to is always black wire which goes to the compressor and the fan motor, red to adjacent lug of the contactor which then one goes to the capacitor and one to the compressor and one to the outdoor fan motor. One wire usually yellow from capacitor to start winding of compressor marked on the capacitor as herm, and a brown wire to the fan motor from the capacitor. The side connectors as you know go to the 24v control coil. The reason as to the fuse going out could be due to loose connections in the disconnect box or a short in the wiring at the compressor, fan motor or capacitor, and worst case a shorted compressor internally. Recommend having the system checked with the proper equipment to include an ohm meter with uf reading ability.

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1 Answer

All of the sudden tonight it was getting hot went to adjust thermostat and it was blank. No air and no fan. Bought new thermostat (above). checked circuit breakers. thermostat shows it is on but wont kick...


At the thermostat you have several colored wires. Touch the green and red wire together and see if the indoor fan comes on. If you know what wire goes to the coil on your AC contactor touch the red wire to that wire. If it starts the outdoor fan and your compressor the thermostat is not wired correctly. All you are doing by my suggestion is bypassing the thermostat to eliminate it as the possible problem.

The outdoor AC contactor coil wire is usually yellow or blue, but you must make sure not to short the red wire to the other side of your transformer as that will cause you to have to buy a new transformer. Your unit wire diagram should show the wire to the AC contactor coil. You need to determine which wire feeds the AC coil which closes the contactor to the compressor and outdoor fan motor.

If this helps please rate me at fixya.com

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1 Answer

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You connect the two hot wires from your power source to the two lugs in the. On the other side of the disconnect you connect the two hot wires to the A/C unit to the other two lugs. You tie the neutral wires (white) together and insulate them. You ground the ground wire to the box and run a ground wire to the AC unit.

So, you should have a red, black white and ground wire on the supply side to your disconnect. The red and black are your hots from your main box to the disconnect. They go on one side of the disconnect. The units red and black go ont other side. You connect the neutrals and ground it and you are in business.

Don't guess, because you are fooling with 220 Volts AC which will knock you silly.

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1 Answer

I don't know how to wire up my air conditioner. I have two hot wires, but no place to attach the ground wires. It is a self contained outside unit.


Your Ruud is a 220 volt AC unit and requires two hot wires and one ground. The ground wire goes to the case inside of the electrical box close to the contactor that the two hot wires connect to. I have included a picture of what the grounding lug looks like so you will have no trouble finding it.

Grounding lug

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I have tried replacing my honeywell twice in the past year. My problem is that I have to push and try and move my thermostat around for the ac to kick on. Once I can get the ac on, it turns off again and I...


Hello, sounds like the problem Is a wiring issue, there might be a loose wire in the wall causing this problem with your thermostat, however usually the wires don't get loose in the wall unless they were spliced. Also, make sure the connections on the thermostat sub base are tight to each terminal and that the thermostat is mounted securely to the wall.

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How do you wire a dayton electric unit heater? Model-3e030,watts-15000, phase-3, motor amps-22, motor volts-120, heater volts-480, listed air heater-492b, cycles-60 ac.You have a...


red, white, and black will be your high voltage. Green will probably be for ground and yellow and orange go to the thermostat. I can confirm on Monday when I have access to manuals.

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1 Answer

Ground cable for battery has no home??


It should bolt to the engine and or chassis, it should have a lug on the loose end, if it does not then look of the lug on the frame or side of the engine.
If the lug is missing and all you have is a bare wire end then the cable should be replaced.

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1 Answer

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