We inherieted this job from a company that hacked the installation.
The problem was and still is that it trips on oil failure. We tried to correct all the things that we found wrong that would contribute to this problem. Mainly, low load conditions.
We increased the supply air duct size. Cleaned the Evap and fan wheel. Repiped the oil lift lines on the suction side as per manufacturers recommendation.
The superheat is reading high 25 degF on both circuits. Sight glass is full. The feeler blubs are now tight which they were not before. There was no filter driers. We added one.
This is a 10 ton system. Carrier 38AQ012. 2 circuit HP.
The suction pressure ranges between 50-60 and the head is around 200 psi. The oil pressure is 4 psi differental.
Someone suggested that dip tube broke off inside the compressor. But if that was the case why is the oil leaving the compressor? How do you check the oil dip tube? The trouble shooting chart doesn't mention this.
We are ready to change the compressor but we don't want to have the same problem after we get done so. It is no fun being a parts changer.
Any input would be greatly appreciated.