mycom 3225**C Series User Manual

2202MYJE-MY-C8-N_2018.02.
Chapter 5 Maintenance and Inspection
Compound 2-stage Screw Compressor 3225**C 5.2 Maintenance and Inspection List
5-3
5.2 Maintenance and Inspection List
5.2.1 Daily Management
For the purpose of daily maintenance, check the items listed in Table 5-1 "Daily Inspection Item" and
record the results.
Regularly recording the daily operational data in an operation log makes it possible to detect any
significant change in the system. This practice is particularly effective in preventing possible failures of
the compressor.
It is particularly important to keep track of the records that indicate the relationship between the
temperature and pressure, as it is closely related to the evaporation and condensation of the refrigerant,
in quickly finding any abnormal condition of the compressor or the system.
Keeping an operation log in this way can facilitate the efforts to properly track down the cause of failure
or accident that may occur in the compressor or the system, making it easier to quickly and accurately
deal with the situation.
Table 5-1 Daily Inspection Items
Inspection item
Inspection details
Checkpoints and actions
Compressor
Hours of operation
hour
Total hours of operation
 Used to determine the timing of
regular maintenance and
inspection
Suction pressure
MPa
Difference from the pressure
that corresponds to the
specified evaporation
temperature
 Cleanliness of the cooling pipe
surface
 Temperature and flow of the items
to be cooled
Intermediate
pressure
MPa
Difference from the normal
pressure during rated operation
 If the pressure is too high (or too
low), check the conditions of the
high/low-stages.
Discharge pressure
MPa
Difference from the
condensation pressure for the
specified cooling water
temperature
 Cleanliness of the condenser
cooling pipe
 Mixing of non-condensing gas
 Amount and temperature of the
cooling water
Oil supply pressure
MPa
Difference from the discharge
pressure
 Whether the differential pressure is
decreasing or not
 Liquid flow-back operation
 Wear of compressor parts
Pressure loss of the
oil filter
MPa
Pressure difference between
the inlet and outlet ports of the
oil filter
 Contamination of the lubricating oil
 Clogged oil filter
Suction temperature
°C
Whether upper or lower limit
temperature is not exceeded
 Temperature and flow of the items
cooled
Suction degree of
superheat
°C
Whether the degree of
superheat is appropriate or not
 Adjustment of expansion valve
 Insufficient refrigerant circulation
Intermediate
temperature
°C
Whether upper or lower limit
temperature is not exceeded
 Adjustment of the intermediate
expansion valve
Discharge
temperature
°C
Whether it is within the upper
limit temperature
 Mixing of non-condensing gas
 Supply oil temperature, insufficient
amount of oil supply
 Compressor failure
Supply oil
temperature
°C
Whether upper or lower limit
temperature is not exceeded
 Cleanliness of the cooling pipe of
the oil cooler
Capacity control
loading
%
Normally operation
 Damaged coil of the solenoid valve
 Improper manual valve adjustment
of the solenoid assembly
Leak at the
mechanical seal
mL/hr
Amount of leak per hour
 Mechanical seal failure
Noise and vibration
-
Abnormal noise and/or
vibration
 Compressor failure

mycom 3225**C Series Specifications

General

Brand	mycom
Model	3225**C Series
Category	Compressor
Language	English