Need technical support for York YR 300TR water cooled screw compressor.
To attend the sliding valve stuck up issue, the R134a gas was unloaded using compression vacuum pump upto 5"Hg column. Next day morning it was noted that chilled water got mixed in the gas chamber and the motor got immersed in water due to evaporator tube damage and leak. THe chiller plant was running in good condition until the plant was stopped.
a) What are the possible reasons for the evaporator tube damage. The plant is about 5 yrs old and the bottom row extreme tubes in the evaporator section got damaged. While removing the gas, chilled water circulation was done at 15 deg.C, 4kgf pressure.
b) We would like to know if anything went wrong while unloading the gas ? Checked for any water particles in the last cylinder in which the gas was unloaded by transferring to another cylinder and no water was found.
c) What is the best procedure for improving the motor megger value without removing the motor. At present about 1 Megohm is the value. Is it advisable to pass hot dry nitrogen through the gas charging side and what is the recommended max temperature of the gas to minimize the moisture removal time. Whether the bearings need to be replaced ? What is the safest megger value before restarting the compressor motor.
d)Is it necessary to rewind the compressor motor and the bearings just they got immersed in water ? Will the life of motor and the bearings be drastically reduced just in case the plant starts normally ? Will there be any issues such as carbon contamination / accumulation in the gas chamber if the motor is not rewound.
e) Any one can provide the cross-section drawing of the MaxE YR chiller compressor motor ?
f) Is there any York chiller compressor maintenance manual available in soft copy form. Can anyone post it ?
Seeking expert support from the team.