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INSTALLATION AND PREPARATION FOR USE
PREPARATIONS FOR USE
1.4.9.3 Frequency controlled compressor
1.4.9.4 Pre-start check list
The following Paragraph covers only the initial start of the compressor and not
the complete refrigeration plant.
Be sure that all necessary system valves are open and that the refrigeration
system is ready for start up. Use the following check to guarantee that no items of
importance regarding the compressor (package) have been overlooked.
i.
ii.
iii.
iv.
v.
vi.
vii.
viii
.
When all items are verified, the compressor (package) is ready for the start-up.
1.4.10
Starting and stopping procedures
When starting the compressor a distinction should be made between:
1.4.10.1 First start
30
Hint!
In case of frequency controlled compressors, a separate instruction
00.87.041 is required. If you don't have this instruction consult Grasso.
System is charged with refrigerant.
Settings of safety limit switches are adjusted properly.
Direction of rotation of compressor crankshaft is correct.
Check capacity control: Set the electrical capacity control to the position of the
lowest part load step.
Oil level established in sight glass.
Stop valves to the pressure gauges are open.
Suction stop valve is closed (in case the evaporating temperature is much
higher than the design evaporating temperature) and the discharge stop valve
is open and in case of two- stage compressors that the stop valves in the
intermediate circuit lines are open.
Stop valve in the oil return line of the oil separator (if present) is closed.
Hint!
For all limitations refer to "Main setup data"-overview! The values in
the main setup data tables, overrules the values as mentioned in the
text.
0089288_imm_v_english_19
07.04.2021
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Troubleshooting
