Maintenance List; Daily Management - mycom 2016 C Series Instruction Manual

5.2

Maintenance List

5.2.1

Daily Management

As daily management, check the items listed in Table 5-1 "Daily Inspection Items" and record the
results.
Logging these operation data on a daily basis aid in finding out any abnormal conditions of the
compressor. 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 refrigerating unit
components and load side conditions on a daily basis. For their details, refer to the instruction manual
of the refrigerating unit.
Inspection Items
Operating hours
Suction pressure
Intermediate pressure MPa Pressure difference from
Discharge pressure
Oil supply pressure
Oil filter pressure loss MPa Pressure difference between
Suction temperature
Degree of superheat
for suction
Intermediate
temperature
Discharge
temperature
Compound 2-stage Screw Compressor 2016**C
Table 5-1 Daily Inspection Items
Inspection Contents
h Total operating hours
MPa Difference from the set value
Note 1
of evaporation temperature
equivalent pressure
rated operation (normal
value)
Mpa Difference from cooling water
temperature equivalent
condensing pressure
MPa Difference from discharge
pressure
oil filter inlet and outlet
°C Whether within upper and
lower limits
°C Whether degree of
superheat is proper
°C Whether within upper and
lower limits
°C Whether within upper limit
5-2
2200LZJE-HO-C6-N_2013.12.
Chapter 5 Maintenance
Check Items/Actions

Judgment of periodic
maintenance timing

Contamination on the cooling
pipe surface

Temperature, flow rate, etc. of
the object to be cooled

If it is too large, check high-
stage. If it is too small, check
low-stage.

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

Adjust intermediate expansion
valve

Non-condensable gases mixed
into the system

Oil supply temperature,
insufficient oil supply

Compressor failure
5.2 Maintenance List