2200M4JE-HO-iS2-N_2014.04.
Chapter 5 Maintenance and Inspection
Screw Compressor i-series
5.2 Maintenance and Inspection List
5-3
Inspection Item
Inspection Details
Check Items/Actions
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 at test run
Compressor failure
Oil level of oil
separator
- Oil
level
Oil loss
Replenish oil
Fluid level in the
receiver
- Fluid
level
Check for refrigerant leak
Replenish refrigerant
Refrigerant leak
check
-
Leak or not
The machine room and load side
facilities
■
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.
2.
Replacing oil filter
When the pressure difference 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 hours, 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 pressure difference 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 section
If much oil leaks from the mechanical seal section, 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 assembly.
Table 5-2
Guideline for Leak from Mechanical Seal Section
Condition
i125 / i160
Allowable leak rate
mL/h
≤
3
Rate at which inspection must be done
mL/h
≥
9
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.
