2200LZJE-HO-C6-N_2013.12.
Chapter 5 Maintenance
Compound 2-stage Screw Compressor 2016**C
5.2 Maintenance List
5-3
Inspection Items
Inspection Contents
Check Items/Actions
Oil
supply
temperature
°C Whether within upper and
lower limits
Contamination on cooling pipes
of oil cooler
Capacity control
Indicated load
%
Whether operation is normal
Damage to solenoid valve coil
Improper adjustment of manual
control valve of
electromagnetic assembly
Leak from
mechanical seal
ml Leak per hour
Mechanical seal failure
Noise and vibration
Abnormal noise/vibration
Compressor
failure
Others
Motor current
A
Whether it is higher than the
current at test run
Compressor
failure
Oil level of oil
separator
- Oil
level
Oil
entry
Replenish
oil
Fluid level in the
receiver
- Fluid
level
Replenish
refrigerant
Check for refrigerant
leak
-
leak or not
The machine room and the
load side facilities
Note 1 : Unless otherwise noted, the pressure unit MPa represents the gauge pressure in this
manual.
Daily
Maintenance
Items
1.
Lubrication oil level
When the oil level in the oil separator reaches the lower limit, charge lubricant by referring to the
instruction manual of the unit.
2.
Replacing oil filter
When the differential pressure between the lubrication oil supply pressure and the discharge
pressure is 0.15 MPa or higher, replace the oil filter. At the beginning of the operation, the
differential pressure of the oil filter may increase quickly.
3.
Cleaning of suction strainer
When the compressor operating hours exceeds 500, check the suction strainer. If a temporary
filter is installed for the initial stage of operation, remove it.
At the beginning of the operation or after periodical check, the differential pressure between the
front and back of the suction strainer may increase quickly. If the differential pressure becomes
large, check and clean the suction strainer.
4.
Lubricant leak rate from mechanical seal
If much oil leaks from the mechanical seal, determine the leak rate per hour. The following table
shows guidelines for allowable leak rate and the rate at which inspection must be done.
If any problem (damage, etc.) is found in mechanical seal, replace the mechanical seal.
Table 5-2 Guideline for Leak from Mechanical Seal
2016**C
Allowable leak rate
≤
3 ml/h
Rate at which inspection must be done
≥
9 ml/h
Note: The specifications above are just guidelines. They are not guaranteed values.
5.
Contamination on the cooling water side of the cooling pipes of condenser and oil cooler
Clogging and contamination of the cooling pipe is largely affected by the quality of cooling water.
When the oil temperature and discharge pressure gradually rise during the initial stage of
operation, inspect and clean the cooling water side of oil cooler and condenser even when the
time has not yet come at which inspection must be done.
Comp
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