I lurk here quite a bit but rarely post.
I now have a problem that has me scratching my head.
I have 2 identical Carrier packaged rooftop units on a building.
Each unit has 2 Carlyle 06E compressors.
Stage 1 has 2 12T TX valves while Stage 2 has 2 10T TX valves in parrallel.
The units have gone through a refresh with new compressors, TX valves, liquid line shutoff valves, driers etc.
The evaporators, condensers and blowers were thouroughly cleaned.
On the first unit stage 1 is running excessively high condensing pressure (275psig) while stage 2 is running 220psig.
On the 2nd unit stage 2 is running excessively high condensing pressure (300psig) while stage 1 is running 225psig.
This is on a 78F day.
All circuits were charged by weight according to the dataplate and the sight glasses give every indication that the charge is correct.
Superheat at the TX valves is 10F and suction pressure is around 65psig with a 73F return.
All condenser fans are running and are single phaze 347v so rotation is not an issue.
All are using identical blades which appear to have quite a shallow pitch.
If it were the condenser fan blades I would need to assume that all circuits would be running higher condensing pressures.
What can be causing this?