901-10113 - 37 - 9/16/2024
Noisy Compressor:
Loud, metallic rattle
Noise lasts less than 10 seconds.
Only happens at initial start-up.
Unit was not operated for several days or
more.
No issue.
It can take several seconds for the compressor
to get fully oiled.
Noise lasts longer than 10 seconds.
Oil level in sight glass is normal.
Three-Phase electrical system.
Compressor may be rotating backwards.
Running backwards can cause severe damage.
Usually caused by miswiring when replacing a
contactor.
Otherwise, due to failure of phase-rotation
correction system. The system is designed to
detect phase rotation and uses one of two
contactors to ensure forward rotation.
Contact JTB for assistance.
Noise lasts longer than 10 seconds.
Rotation is correct.
Oil level is low.
Low oil level can cause noisy operation and
severe damage.
Add POE oil – seek assistance.
Bulged or inflated
Cold Plate
Internal refrigerant leak. Refrigerant is above
atmospheric pressure, so it inflates the Cold
Plate like a balloon.
Use caution, distortion can cause the Cold
Plate to break free from its mounts.
Do not pump-down the system.
Be aware that Cold Plate solution (a trade
secret, but likely containing water, dissolved
salts, and glycols) could migrate back into the
refrigerant tubing if the suction pressure
decreases (due to running the compressor or
using a recovery machine or vacuum pump on
the system).
May want to use (additional) filter-dryer on
inlet of refrigerant recovery machine.
After replacing defective Cold Plate, do a dry
nitrogen and/or solvent flush to clean any
potential contaminants out of the system.
Replace the filter-dryer on the condensing
unit. Consider adding a suction side filter-
dryer.
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