Maintenance And Inspection List; Daily Management - mycom 4032**C Series Instruction Manual

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.
Inspection item
Hours of operation
Suction pressure
Intermediate
pressure
Discharge pressure
Oil supply pressure
Pressure loss of the
oil filter
Suction temperature
Suction degree of
superheat
Intermediate
temperature
Discharge
temperature
Supply oil
temperature
Capacity control
loading
Leak at the
mechanical seal
Noise and vibration
Compound 2-stage Screw Compressor 4032**C
Table 5-1 Daily Inspection Item
Inspection details
hr Total hours of operation
MPa Difference from the pressure
that corresponds to the
specified evaporation
temperature
MPa Difference from the normal
pressure during rated operation
MPa Difference from the
condensation pressure for the
specified cooling water
temperature
MPa Difference from the discharge
pressure
MPa Pressure difference between
the inlet and outlet ports of the
oil filter
°C Whether upper or lower limit
temperature is not exceeded
°C Whether the degree of
superheat is appropriate or not
°C Whether upper or lower limit
temperature is not exceeded
°C Whether it is within the upper
limit temperature
°C Whether upper or lower limit
temperature is not exceeded
% Normally operation
mL/hr Amount of leak per hour
- Abnormal noise or vibration
5-3
2201Q4JE-MY-C9-N_2018.01.
Chapter 5 Maintenance and Inspection
Checkpoints and actions
 Used to determine the timing of
regular maintenance and
inspection
 Cleanliness of the cooling pipe
surface
 Temperature and flow of the items
cooled
 If the pressure is too high (or too
low), check the conditions of the
high/low-stages.
 Cleanliness of the condenser
cooling pipe
 Mixing of non-condensing gas
 Amount and temperature of the
cooling water
 Whether the differential pressure is
decreasing or not
 Liquid flow-back operation
 Wear of compressor parts
 Contamination of the lubricating oil
 Clogged oil filter element
 Temperature and flow of the items
cooled
 Adjustment of expansion valve
 Insufficient refrigerant circulation
 Adjustment of the intermediate
expansion valve
 Mixing of non-condensing gas
 Supply oil temperature, insufficient
amount of oil supply
 Compressor failure
 Cleanliness of the cooling pipe of
the oil cooler
 Damaged coil of the solenoid valve
 Improper manual valve adjustment
of the solenoid assembly
 Mechanical seal failure
 Compressor failure
5.2 Maintenance and Inspection List