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Well, tech came out and didn`t know were the noise was coming from. This system has no belts or bearings so that wouldn`t be the problem. The only main things that the system has is the compressor and the motor. He said that the refrigerant deal was fine. He said that if there is a major problem with the unit, it will automatically shut itself off.
The high pitch noise happens after the unit has shut off completely.
Well, tech came out and didn`t know were the noise was coming from. This system has no belts or bearings so that wouldn`t be the problem. The only main things that the system has is the compressor and the motor. He said that the refrigerant deal was fine. He said that if there is a major problem with the unit, it will automatically shut itself off.
The high pitch noise happens after the unit has shut off completely.
Great! those are the best kind of service calls for both you and the service tech. Could you describe the noise as if air escaping from a balloon that gets progressively quieter?
If you are hearing this when the compressor stops (and only when your compressor stops) I go back to my earlier guess that you are hearing the high pressure refrigerant bleed back through the compressor valve(s) to the low pressure section of the compressor. It's normal for the system pressure to equalize but this generally happens in your evaporator section and would not be "heard". The valves are not unlike the reed in a kazoo and I think you are hearing one of them vibrating because it isn't completely sealing like it should.
Probably a small leak-by and not enough slop in the valves to affect system performance and something that wouldn't show up when the tech had his gauges on it while it was running. It might have shown up with the guages by observing how fast the pressures equalize upon shut-down but if it's cooling your house then I wouldn't worry about it.
The one potential problem is that it may be possible at some point to have liquid refrigerant (from the condensor) bleed past the valves into the compressor piston section during the off cycle. The compressor does not like to pump liquid and will likely destroy itself in attempting to do so at start up. This is called scrambling the compressor, cute huh?
Not sure what your observation of the squeal getting louder this year would imply. Don't worry tho, if yours hasn't destroyed itself by now, your leak (you aren't "losing" any refrigerant) is small enough that it probably won't happen anytime soon.
I know its been a while, but have you solved this problem? I have a similar problem but only on startup for less than 25 seconds. Ive had 3 different companies come out and no one had any idea, as the ac is cooling fine. The last company thought it was the reversing valve and had it relplaced, but the sound is still there. Now we are waiting on a rep from the manufactuer to come out.
You need to call a technican as soemthing is overloading the breaker which is what its there for.
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