Symptom
08
Leak from
Sliding surface is
mechanical
roughened due to
seal
overheating.
Machine is stopped
for a long time.
(No oil film on
sliding surfaces)
Deteriorated part(s)
Incompatibility of
lubricant and
operating
conditions (such as
working
temperature range
or refrigerant)
Poor contact of
sliding surfaces
Compound 2-stage Screw Compressor 2016**C
Direct cause
Started and
stopped too many
times.
* In case of
standard
equipment, "four
or more times per
hour" is
considered
"frequent/too
many".
The amount of
lubricant contained
in refrigerant gets
smaller, resulting in
decreased
viscosity.
Overheated
operation
Oil supply
temperature is high.
User-specific
conditions, such as
intermittent heat
load
Hardened O-ring
Swelled O-ring
* This occurs when
the lubricant of
refrigerating
machine contains
large amount of
refrigerant.
Deteriorated seal
ring/mating ring
Unsuitable lubricant
was selected, or
operating
conditions have
changed after
installation of the
equipment.
Foreign matter
attached to sliding
surfaces, due to
contaminated
lubricant.
Root cause
If heat load is less than the level set
by the equipment's design
conditions, review the operating
conditions and set control such that
equipment is started/stopped less
frequently.
In case of capacity control
malfunction, see "Capacity control
malfunction" in item No. 11.
In case of liquid flow-back, remove
the cause(s).
If oil heater or devices on its control
circuit are defective, replace the
defective part.
See the causes in item 02,
"Insufficient refrigerant flow".
See the causes in item 07, "Oil
supply temperature is high".
If machine is sometimes stopped
longer than a week, take either of
the following measures: (i) Manually
operate oil pump alone and turn the
rotor shaft of the compressor.
(ii) Attach an oil pot for supply oil to
the seal cover.
If deteriorated over time, replace.
For other specific causes, see the
causes/action for symptom
"Overheating of sliding surface".
In case of liquid flow-back, remove
the cause(s).
If oil heater or devices on its control
circuit are defective, replace the
defective part.
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.
6-6
2200LZJE-HO-C6-N_2013.12.
Chapter 6 Troubleshooting
Action
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