I installed a 4 ton R22 unit (12seer), 4 ton coil, TXv, furnace. Unit came charged with nitrogen. Evac'd, charger to what I thought was a right amount of 22 then left. (installed in March) Came back today. 90 o/s temp. 80 inside. Put my gauges on 80 lbs suction 200 lbs head. no super heat, warm suction. 5 ton blower so I slowed it down to 4 ton , no change.
Dumped Freon to get suction to 65 lbs. now warm suction 8 degree split.
Added r22 to get head up to 225. Now 85 suction, cold suction line and 14 degree split. Mild super heat. ( looks like I'm going the right way, but 85 suction ?)
what do you think is going on here ? I afraid to get the suction any higher but I need the split up to 20 to cool this house.
I looked at the coil , looks like all pass's are sweating but still only got a 14 split.
Any ideas ?