Maintenance And Inspection List; Daily Management - mycom SCV 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 Items" and
record the results.
These operation data should be recorded in an operating log book on a daily basis. This practice is
significantly effective and helpful in finding out any abnormal condition of the compressor and prevents
possible compressor failures.
In particular, it is important to confirm the absence of any abnormality between the temperature and
pressure correlations related to the refrigerant evaporation and condensation. It is possible to find any
abnormal condition in the compressor or the system quickly by monitoring the evaporation and
condensation temperature and pressure.
If any compressor/system failure or operating accident occurs, the operating log book will help the
cause to be clear and take appropriate measures promptly.
Inspection item
Operating hours
Suction pressure
Discharge pressure
Oil supply pressure
Oil filter pressure
loss
Suction temperature
Degree of suction
superheat
Discharge
temperature
Oil supply
temperature
Operation check of
Slide valve
Leak from
mechanical seal
Noise and vibration
SCV-series Screw Compressor
Table 5-1 Daily Inspection Items
Inspection details
hr. Total operating hours
MPa Difference from the set value of
evaporation temperature
equivalent pressure
MPa Difference from cooling water
temperature equivalent
condensing pressure
MPa Difference from discharge
pressure
MPa Pressure difference between oil
filter inlet and outlet
°C Whether within upper and lower
limits
°C Whether degree of superheat is
proper
°C Whether within upper limit
°C Whether within upper and lower
limits
% Whether operation is normal
mL/h Leak per hour
- Abnormal noise/vibration
5-3
2205Q2JE-HO-S6-N_2020.01.
Chapter 5 Maintenance and Inspection
Checkpoints and actions
 Judgment of periodic maintenance
timing
 Contamination in the evaporator
 Temperature, flow rate, etc. of the
object to be cooled
 Contamination on condenser
cooling pipes
 Non-condensable gases mixed into
the system
 Quantity, temperature, etc. of
cooling water
 Whether differential pressure is
decreasing
 Operation with liquid flow-back
 Whether compressor parts are
worn
 Contamination of the lubricant
 Clogged of oil filter
 Temperature, flow rate, etc. of the
object to be cooled
 Adjust expansion valve
 Insufficient refrigerant flow
 Non-condensable gases mixed into
the system
 Oil supply temperature, insufficient
oil supply
 Compressor failure
 Contamination on cooling pipes of
oil cooler
 Damage to solenoid valve coil
 Adjustability of manual
control(needle) valve for Solenoid
valve assembly
 Damage to mechanical seal
assembly
 Compressor failure
5.2 Maintenance and Inspection List