Just installed a 13 seer Rheem AJN series last week and the unit makes a rushing water sound in the attic that comes and goes. I'm certain is the freeon line and the contractor came out vacumed the entire line and insalled another filter in the line and new site glass outside. We didn't move the lineset or touched anything inside the attic and it's not leaning against any structure , just secured to a wood frame exactly like before.
It seems like there's a valve somewhere that closes and opens and you hear the freeon (running water )through the attic and goes away and comes back again. The contrcator is puzzeled and I'm wondering if you guys can suggest anything.
Thanks in advance for your help.