Hello, the low side will sweat (that means have excessive moisture) when the system is running, that is its job, to take moisture out of the air.
The 250 pounds pressure on both sides of the system happens when the compressor is not running and the pressures equalize... that pressure will vary depending on the weather,
Summary, if your system is running and cooling the house and the suction line is sweating, the system is working perfectly... do not mess with it,
Use a liquid liquid leak detector solution on all of the tube connections to insure that none are leaking...look very very closely at the connection for any sign of a bubble that is growing.
If your system is working properly, and it is, we know that because the suction line is sweating, the air coming off of the condenser is as warm as it should be, only 10 or 15 degrees warmer than the outside air.
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