Maintenance And Inspection List; Daily Management - mycom i125S Instruction Manual

5.2

Maintenance and Inspection List

5.2.1

Daily Management

As daily management, check the items listed in Table 5-1 "Daily Inspection Items" and record the
results.
By regularly recording the daily operational data in an operation log, it should be able to detect any
significant change in the system. This is significantly effective in preventing compressor failures.
It is particularly important to check whether the temperature/pressure correlations related to the
refrigerant evaporation and condensation is proper. This makes it possible to quickly find out problems
in the compressor or the system.
If a failure or accident should occur in the compressor or the system, the operation logbook will help
determine the cause and take prompt and proper actions.
In addition to the items listed in Table 5-1, it is necessary to record and manage unit components and
load side conditions on a daily basis. For their details, refer to the operation manual of the unit.
Inspection Item
Operating hours
Suction pressure
Discharge
pressure
Oil supply
pressure
Oil filter pressure
loss
Suction
temperature
Degree of
superheat for
suction
Discharge
temperature
Oil supply
temperature
Capacity control
Specified load
Screw Compressor i-series
Table 5-1 Daily Inspection Items
Inspection Details
h 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
℃
Whether within upper
and lower limits
℃
Whether degree of
superheat is proper
℃
Whether within upper
limit
℃
Whether within upper
and lower limits
％
Whether operation is
normal
5-2
2200M4JE-HO-iS2-N_2014.04.
Chapter 5 Maintenance and Inspection
Check Items/Actions
 Judgment of periodic maintenance
interval
 Contamination on the cooling pipe
surface
 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 lubricant
 Clogging 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
 Improper adjustment of manual
control valve of electromagnetic
assembly
5.2 Maintenance and Inspection List