Burned Wires

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Old 04-08-05, 09:23 AM
totalfor
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Burned Wires

Our AC/Heating unit has been burning wires near the compressor and on the relays inside the house. The burned wires in the compressor occur when the AC is on and the burned wires occur inside on the timer relays when the heat is turned on. Several heating and air repairmen have replaced the wire only to have them occur again and again. The last one says he doesn't know what the problems and wanted to sell us a new system. Obviously there is to much electricity being applied to the system and there is a reason for the problem somewere and I would like to know before purchasing a whole new system. Has anyone seen a simulair situtation and know how to fix this? Thanks
 
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Old 04-08-05, 12:44 PM
Nominal
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When you say relays on the inside, I am going to assume you mean breakers that are for the outside condensing unit. Do you have any other electrical problems in your home? If you suspect electrical problems, most of the companies that supply the power offer free evaluations. Also, if it is electrical problems and you are experiencing other problems besides the A/c unit, you will probably need the power company or an electrician, not an A/c guy. Also, a compressor can have internal problems that will cause the wires to burn off at the terminals. If this is the problem there is no fix except for replacement of compressor, and if system is old, you would be better off replacing system. A loose connection will also cause wires to burn. If after the first wire burnt off, and the technician did not make a tight connection, over time the wire will heat up and burn off again. Depending on the condition of the terminal, they do make repair kits for terminals that bolt on to help ensure a tight connections. I hope this helps and I hope your compressor does not have internal problems. Oh, btw, sometimes a megger?(spelling) will help test the windings in a compressor. However these testers are expensive and some technicians may not have one. The relays burning on the inside unit is probably due to the load from the heat strips. This is usually caused from loose connections. If system is old, then all the wiring connections may need to be retightened. Heat strips are usually not that expensive to have restrung but this still won't help the wiring connections going to all the relays, contactors, or sequencers in the heating compartment. If system is old and you have no other electical issues in your home, then it may be time for a new systems.
 
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Old 04-08-05, 01:52 PM
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The last one says he doesn't know what the problems and wanted to sell us a new system. Obviously there is to much electricity being applied to the system and there is a reason for the problem somewere and I would like to know before purchasing a whole new system.
You can have a lot of ifs ifs here for sure. Like said is every wire on tight? Now first not to much electric most of the time not enough. Did any of the tech's check the voltage comeing in? Did any check the Amp draw of the unit?? Ring out the compressor. Is there any aluminum wire to the unit or in the unit. Do light bulbs in the home burn out fast? Post back here in the same post.

ED
 
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Old 04-08-05, 02:52 PM
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As was suggested we need more info.
Where exactly are the wires burning?

If they are burning at a terminal or set screw they may need to either properly clean the terminal or replace the component that has the burnt terminal.
It is possible for the terminal to be overheated to the point that you cannot clean it enough for it to make good contact.
 
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