We have two 23XL 200Ton R-22 three pass screw machines with the economizer. Chiller #2 has always had a higher approach than #1. It recently had the condenser float replaced as well as isolation valves which leaked and then slide valve shaft seal went south. The charge was recovered and weighed both in and out at 630 pounds. After all was said and done, the condenser approach is now 8.3 to 10.6. On it's worst day prior to all the work, (by Carrier) its approach was at worst 5.6 and at best 2.2. The endbell was pulled and the tubes inspected. All tubes were clean as a whistle but I punched them just on principal since we were in there anyway. There was no change in approach on re-assembly and start-up. We have identical temperature splits on both chillers on the coolers and condensers entering water and leaving water. Evap approaches are about the same at around 1.6. Rotor inlet temps look good, but condenser pressure/temp seem high. I'm starting to think non-condensables... maybe from an improperly evacuated recovery cylinder? The link below is a print out of the chiller data today as it was running. The Carrier techs are scratching their heads and calling Syracuse... Any thoughts?