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heatpump in heating mode pressure 80/330. changed out reversing
My friend installed a gibson heatpump air to air. He said in morning recently for heating in Northern minnesota here, it would make an offal noise and pipes would raddle. He took system pressure and they were off the wall . Low side 100 and high 450. We recovered the refrigerant and changed out the reversing valve and checked the orifice. Pulled a deep vacuum and weighed a charge in 10lbs as per name plate. Now noise has gone away and system working good but pressures in heating mode still 80/340. This is a r-22 sytem. Any suggestions would help.