mycom J Series User Manual

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
Compressor
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.
Compressor

mycom J Series Specifications

General

Brand	mycom
Model	J Series
Category	Air Compressor
Language	English