Question about Carrier 38CKC036 Air Conditioner

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My unit is tripping the main breaker what should i look at first

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With this cold weather, -- it is not likely tripping off because it is too hot!

Are you familiar with the history of this unit?-- Like has it tripped in the past during HOT weather?
This might be a clue, that the circuit is really loaded close to its limit--

This leads to the next possibility: That the breaker is getting weak (They do after many hard starting loads!
Now-- If you can get the system to start and run for just a few seconds-- can you put a Clamp around Amp meter on the wires?-- and read the full load current?
How close is this to the rating of the circuit breaker?
Is the breaker, and the wire size marginal?

Another thing to look for, is loose lug screws at the main fuses, and the Main contactors, and the motor leads--- for loose wires result in overheating, which raises the current, and leads to tripping, too.

How long ago was the condenser cleaned-- this leads to high amp draw too.

But the first thing would be to learn more about the age of the Main Breaker, and what the 'normal' run current is for that system.

Mack B

Posted on Dec 28, 2010

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