I have a 3 ton R410A A/C unit that is 8 years old and is using copper lines that are too small. Does this cause leaks, diaphragm failure, and compressor failure?
The air was not blowing cold, so I had the refrigerant refilled. It works better but only blows about 12 degrees fahrenheit cololer than the intake.
I had a reputable company come out to diagnose. When the new A/C was put in 8 years ago, they used the existing lines in the wall and just attached the new lines (in the attic at the condenser unit and outside at the compressor unit) to the exiting lines. The existing lines were smaller than the lines that go into the machine.
The tech told me that this causes the pressure to rise above what the machine can handle, which is causing several problems: creating leaks in the evaporator, blowing out the diaphragm, and over working the compressor. He said my compressor is working too hard and can die any moment.
He suggests getting a new unit as soon as possible (and is estimating 7,500 - 10,000 for install in my 1600 sq ft 1 story house). He said they would not repair this because of he condition. He tested my compressor, said it is over worked. He leaked some refrigerant and said it smells contaminated. He listened to the compressor and said he can tell it is working too hard. And they supposedly did an electronic test to confirm it was leaking inside the evaporator coil box.
Does this diagnosis sound correct? How long can I milk this A/C unit machine? Am I destroying the compressor by running it with the smaller copper lines?