Lennox Model # XC14 - 030 - 230A09 Serial # 5815F06483 Customer called about his air conditioner blowing hot air. When I arrived the system was low on refrigerant low side was at 70 psi and the high side at 160. I added 2 pound of r-410 refrigerant the system had 7 degrees subcool and a 21 degree split temperature system is operating properly at this point.