Installed a 3hp copland semi-hermetic 3 phase compresssor.
Wired the compressor according to schematic. Unit is dropping temperature, but Will not pump-down. Shut-off liquid valve pressure on low side will not budge. it stays at 5psi,. De-energized liquid line solenoid same effect.
high side is 220 psi. Is it possible that the compressor is wired wrong..