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Air Conditioner loud at start-up

My 4 ton 10 ceer AC unit makes a loud humming, gronning noise when it kicks on, I put a meter on it and it draws over 100 amps at start up, it should only draw about 50 at start-up, any ideas as to what might be wrong?

Re: Air Conditioner loud at start-up

Also I might add its been doing this for over a year so i don't think its broken, it works fine, the only problem is when it kicks on.

Re: Air Conditioner loud at start-up

Bad starting capacitor on the compressor ?

Moon Over My Hammy
Re: Air Conditioner loud at start-up

Last year I had troubles with loud on startup. I had two issues, one being that the condenser unit outside was out of level, the pad had shifted. The second was a bad connection which resulted in low voltage. I also had the "brushes" replaced as one of the three sets was bad. The starting and running capacitors were fine. Since I had the work done at the same time as a seasonal cleaning/tune-up and charge check the work and parts cost only an extra $120.

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