I need some advice.....
I moved into house with new AC. When the ac / scroll compressor kicks on, I hear a buzz noise on the initial start. The unit cools correctly and the charge on the AC has been recently checked and confirmed. Breaker has never tripped.
I thought I heard it by panel as well. FOr safety sake, I had the installation company send out their electrician to take a look inside. Pulled the breaker to check for corrosion/burn. Took amperage readings at start up and normal operating. Put same breaker back and made sure connections were tight. He said everything was OK.
The run of wiring is 50 foot at most from panel to outside unit. Its run with 12 awg on a 20 amp double throw breaker. The same wiring the old unit used.
Within the ratings on name plate I think:
LRA: 68 amps
Minimum Ciruit Amp. 18.7
Maximum Breaker 30 amp
The conclusion the Electrician suggested that it is the conductor inside conduit vibrating/buzzing at the high startup amp of the unit. He said that it was normal. And if it was really irksome, perhaps pulling 10 awg with a 30 amp breaker may stop it. But that was unnecesary money spent and that the buzzing caused no harm in his opinion.
My research also suggests maybe a hard start kit would help. But its my understanding that a kit like that only lessens the duration and magnitude of conduit buzzing and diming lights/voltage drop and does not eliminate it.
Should I be concerned further with this situation or can I go on enjoying the AC this summer? Is this indeed "normal"? For anyone reading, do you ever notice this type of thing when you switch your AC unit on?