My new 2 ton Ruud UAKB 024JAZ condensor copeland scroll compressor is making a loud hum that comes and goes but is there most of the time. My installer and 3rd party tech believe its because we used the .059 piston that came with the Apollo SA3024 air handler. The RUUD manual calls for a .057 piston.
My concern is that it ran quiet as a kitten for 4-5 days before It started making the noise. Seems like it would have started right away??
I have shut the system off. Tomorrow evening we are going to install the new .057 piston, vacuum the system down to 500 microns and recharge with R22.
What if anything has to be done about the compressor oil?? Is that removed during the vacuum process?? The 3rd party tech says the oil isnt removed during the vacuum??