2205B0JE-DA-J-N_2014.05.
5 Maintenance and Inspection
Screw Compressor J-series
5.2 Maintenance List
5-3
Daily inspection items
Based on the operating log, check the following points.
Table 5-1 Daily Inspection Items
Inspection Items
Inspection Contents
Check Items/Actions
Comp
re
s
s
or
Operating hours
h
Total operating hours
Judgment of periodic
maintenance timing
Suction pressure
MPa
Note 1
Difference from the set value
of evaporation temperature
equivalent pressure
Contamination on the cooling
pipe surface
Temperature, flow rate, etc. of
the object to be cooled
Discharge pressure Mpa Difference from cooling water
temperature equivalent
condensing pressure
Contamination on condenser
cooling pipes
Non-condensable gases mixed
into the system
Quantity, temperature, etc. of
cooling water
Oil supply pressure
MPa Difference from discharge
pressure
Whether differential pressure is
decreasing
Operation with liquid flow-back
Whether compressor parts are
worn
Oil filter pressure loss MPa Pressure difference between
oil filter inlet and outlet
Contamination of lubricant
Clogging of oil filter
Suction temperature
°C Whether within upper and
lower limits
Temperature, flow rate, etc. of
the object to be cooled
Degree of superheat
for suction
°C Whether degree of
superheat is proper
Adjust expansion valve
Insufficient refrigerant flow
Discharge
temperature
°C Whether within upper limit
Non-condensable gases mixed
into the system
Oil supply temperature,
insufficient oil supply
Compressor
failure
Oil
supply
temperature
°C Whether within upper and
lower limits
Contamination on cooling pipes
of oil cooler
Capacity control
Indicated load
%
Whether operation is normal
Damage to solenoid valve coil
Improper adjustment of manual
control valve of electromagnetic
assembly
Leak from mechanical
seal
mL/h
Leak per hour
Mechanical seal failure
Variable Vi valve
position (L, M, H)
Whether port position is
appropriate for operating
conditions
Damaged solenoid valve coil
Position sensor failure
Noise and vibration
Abnormal noise/vibration
Compressor
failure
Others
Motor current
A
Whether it is higher than the
current at test run
Compressor
failure
Motor
failure
Oil level of oil
separator
- Oil
level
Oil
loss
Replenish
oil
Fluid level in the
receiver
- Fluid
level
Replenish
refrigerant
Check for refrigerant
leak
-
leak or not
The machine room and the load
side facilities
Note 1 : Unless otherwise noted, the pressure unit MPa represents the gauge pressure in this manual.
Co
mp
ressor
