Working on a Carrier 10 ton semi-hermetoc compressor with two unloaders on it. Not too familiar with this type of compressor, so these are the things i noticed while troubleshooting.
Issue was not enought cooling, system is R-22 suction pressure 83 psi discharge 150 psi. Its controlled by a carrier controller system, and the unloaders are electrical with 24 volt coils. The solenoids are de-energized on a call for 2nd and 3rd stage. Obliviously the system was calling for both stages, but when i energized and de-energized the solenoids to the unloaders the amp and pressures did not change. Both solenoids are good and the super heat was 25 subcool at 12. Came to the conclusion that the unloaders where defective, once unloaders where replaced (didn't use piston) and the solenoids, the unloaders made a clacking sound for a few minutes then stopped. The compressor was running but the DA temp was still at 69 degrees. Im not sure is its a TXV issue, but it needs to be figured out ASAP. Any thoughts? The head pressure is too low and i dont want to overcharge the system.
Issue was not enought cooling, system is R-22 suction pressure 83 psi discharge 150 psi. Its controlled by a carrier controller system, and the unloaders are electrical with 24 volt coils. The solenoids are de-energized on a call for 2nd and 3rd stage. Obliviously the system was calling for both stages, but when i energized and de-energized the solenoids to the unloaders the amp and pressures did not change. Both solenoids are good and the super heat was 25 subcool at 12. Came to the conclusion that the unloaders where defective, once unloaders where replaced (didn't use piston) and the solenoids, the unloaders made a clacking sound for a few minutes then stopped. The compressor was running but the DA temp was still at 69 degrees. Im not sure is its a TXV issue, but it needs to be figured out ASAP. Any thoughts? The head pressure is too low and i dont want to overcharge the system.
