2203M4JE-MY-iS2-N_2017.04.
Chapter 5 Maintenance and Inspection
Screw Compressor i-series
5.2 Maintenance and Inspection List
5-3
5.2 Maintenance and Inspection List
5.2.1 Daily Management
As daily management, check the items listed in Table 5-1 "Daily Inspection Items" and record the
results.
By regularly recording the daily operational data in an operation log, it should be able to detect any
significant change in the system. This is significantly effective in preventing compressor failures.
It is particularly important to check whether the temperature/pressure correlations related to the
refrigerant evaporation and condensation is proper. This makes it possible to quickly find out problems
in the compressor or the system.
If a failure or accident should occur in the compressor or the system, the operation logbook will help
determine the cause and take prompt and proper actions.
Table 5-1
Daily Inspection Items
Judgment of periodic maintenance
interval
value of evaporation
temperature equivalent
Contamination on the cooling pipe
surface
Temperature, flow rate, etc. of the
water temperature
equivalent condensing
pressure
Contamination on condenser cooling
pipes
Non-condensable gases mixed into
the system
Quantity, temperature, etc. of cooling
Difference from discharge
Whether differential pressure is
decreasing
Operation with liquid flow-back
Whether compressor parts are worn
between oil filter inlet and
Contamination of lubricating oil
Clogging of oil filter element
Whether within upper and
lower limits
Temperature, flow rate, etc. of the
object to be cooled
Insufficient refrigerant flow
Non-condensable gases mixed into
the system
Oil supply temperature, insufficient oil
supply
Whether within upper and
lower limits
Contamination on cooling pipes of oil
cooler
Damage to solenoid valve coil
Improper adjustment of manual
control valve of electromagnetic
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