2.2.1
Check list periodical inspection
Check list periodical inspection
CHECK POINTS *
5
FREQUENCY
REMARKS
daily
weekly
monthl
y
Oil level in crankcase
•
Between 25% and 75% height of the sight
glass. For topping up oil, refer to
Section 2.4.1, Page 34.
Colour of the oil
•
The oil should be transparently clear. A
disappearing white colour points to
dissolved refrigerant.
Lubricating oil pressure
difference
•
Min. control oil pressure
•
Oil temperature max.
•
Refer to the "Product Information"
Oil leakage of shaft seal
max.
•
In case of more than 1 cc/hr contact
supplier.
Suction pressure
•
Check against design conditions. Refer to
plant manual.
Discharge pressure
•
Refer to plant manual. For the max.
allowable discharge pressure refer to the
technical data of compressor.
Suction superheat
•
≥0 K (NH
3
)
Discharge temperature
max.
•
170 °C.
Oil temperature min.
•
During compressor standstill the lower part
of the crankcase must remain warmer than
the surroundings: ≥ 20 °C (NH
3
)
Adjustment and
operation of pressure
safety switches
•
Refer also to instructions of switch
manufacturer.
Capacity control (if
provided)
•
Switching frequency of
the compressor
•
Number of operating
hours
•
Check the number of operating hours in
view of any maintenance operations to be
carried out.
2.3
STEPS FOR LONGER SHUT-DOWN PERIODS (> 6 months)
To shut down a compressor for long term periods, proceed as follows:
i.
Tightly shut both the suction and discharge stop valves and the stop valve of
the oil return line (if present).
ii.
Disconnect the power source from the compressor drive motor and the
electrical control cabinet.
5
During the first 50 operating hours the compressor should be checked regularly for all the points
mentioned above, at least twice every 24 hours and more frequently in cases where irregularities are
found.
INSPECTION AND TROUBLE SHOOTING
STEPS FOR LONGER SHUT-DOWN PERIODS (> 6 months)
P-NL-094_imm_VHS_English_13
26.07.2021
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