2200M4JE-HO-iS2-N_2014.04.
Chapter 6 Troubleshooting
Screw Compressor i-series
6-6
Symptom
Direct cause
Root cause
Action
07 Leak
from
mechanical
seal
Deteriorated part(s)
Deteriorated seal
ring/mating ring
If deteriorated over time, replace.
For other specific causes, see the
causes/action for symptom
"Overheating of sliding surface".
Incompatibility of
lubricant and
operating conditions
(such as working
temperature range
or refrigerant)
Unsuitable
lubricant was
selected, or
operating
conditions have
changed after
installation of the
equipment.
If possible, review the operating
conditions.
If not, see "4-1 Lubricant
(Refrigerant Oil)" to select suitable
lubricant and replace the whole
quantity.
Poor contact of
sliding surfaces
Foreign matters
attached to sliding
surfaces, due to
contaminated
lubricant.
Replace the whole quantity of
lubricant.
Install bypass filter to oil supply
line.
Faulty assembly of
parts
Human error
Disassemble, replace parts and
reassemble.
Use assembly check sheet to
ensure confirmation.
08 Squeaking
sound from
mechanical
seal part
During initial period
after exchange for
new product,
squeaks may be
heard from sliding
surfaces until they
fit together.
As the sliding
surfaces are very
hard and dense,
they need time to
fit together.
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.
09 Capacity
control
malfunction
Failure of capacity
control solenoid
valve or related
relays
Mostly caused by
coil burnout.
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.
Internal leakage of
capacity control
solenoid valve
Aging degradation
Replace.
Capacity control oil
supply line is
defective.
Leak/clogging in
solenoid valve
gland or oil supply
piping
Remove cause, and check oil for
contamination/replace oil.
10
Compressor
generates
abnormal
vibration
and/or
sound.
M rotor shaft
vibrates
excessively.
Thrust bearing
glands are
tightened unevenly.
If lock nuts are not loose and parts
such as thrust bearing are free of
defects, tighten the glands evenly.
Thrust bearing
glands get
loosened.
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.