mycom i125S Instruction Manual page 90

Symptom
07 Leak from
mechanical
seal
08 Squeaking
sound from
mechanical
seal part
09 Capacity
control
malfunction
10 Compressor
generates
abnormal
vibration
and/or
sound.
Screw Compressor i-series
Direct cause
Deteriorated part(s) Deteriorated seal
ring/mating ring
Incompatibility of Unsuitable
lubricant and lubricant was
operating conditions selected, or
(such as working operating
temperature range conditions have
or refrigerant) changed after
installation of the
equipment.
Poor contact of Foreign matters
sliding surfaces attached to sliding
surfaces, due to
contaminated
lubricant.
Faulty assembly of
parts
Human error
During initial period As the sliding
after exchange for surfaces are very
new product, hard and dense,
squeaks may be they need time to
heard from sliding fit together.
surfaces until they
fit together.
Failure of capacity Mostly caused by
control solenoid coil burnout.
valve or related
relays
Internal leakage of Aging degradation
capacity control
solenoid valve
Capacity control oil Leak/clogging in
supply line is solenoid valve
defective. gland or oil supply
piping
M rotor shaft Thrust bearing
vibrates
glands are
excessively. tightened unevenly.
Thrust bearing
glands get
loosened.
Root cause
If deteriorated over time, replace.
For other specific causes, see the
causes/action for symptom
"Overheating of sliding surface".
If possible, review the operating
conditions.
If not, see "4-1 Lubricant
(Refrigerant Oil)" to select suitable
lubricant and replace the whole
quantity.
Replace the whole quantity of
lubricant.
Install bypass filter to oil supply
line.
Disassemble, replace parts and
reassemble.
Use assembly check sheet to
ensure confirmation.
Squeaking itself does not cause
leak from seal or deterioration in
sealing function.
Normally, squeaking is heard for
several dozens of hours, however,
it may last longer in rare cases.
→In this case, contact one of our
service centers.
If deteriorated over time, replace.
If the symptom is caused by water
leakage, etc., remove the
cause(s) and then replace
defective part(s).
For details, refer to the instruction
manual of solenoid valve.
Replace.
Remove cause, and check oil for
contamination/replace oil.
If lock nuts are not loose and parts
such as thrust bearing are free of
defects, tighten the glands evenly.
Lock washer claw not bended, or
thrust bearing rolling elements
(balls) are worn.
→ Check the thrust bearing. If
any defect is found, replace it,
and then reassemble it after
adjusting end clearance and
checking shaft runout.
6-6
2200M4JE-HO-iS2-N_2014.04.
Chapter 6 Troubleshooting
Action