7. MAINTENANCE
93
ENGLISH
- Add oil
Enough amount of oil is filled into the chiller before shipping. Therefore it is not necessary to add oil in normal situa-
tion. The normal oil level in the compressor oil sump should be maintained above the top of the low-level sight glass
and in the middle level of high-level sight glass when compressor is running. If there is too much or too small
amount of oil in the chiller, it affects the chiller's refrigeration efficiency and may cause a serious damage to the
compressor. To check the oil level in the compressor, the chiller should be in the stable running condition(Generally,
chiller reaches to the stable condition after 30 minutes or 1 hour has passed after startup.). If oil adding is needed
due to oil shortage, first the suction and discharge valves of the compressor should be interrupted when the opera-
tion is in stop.
And, through the channel located in the suction and discharge valves of the compressor the remaining gas in the
compressor should be extracted. And then, make the compressor to vacuum state using a vacuum pump. If the oil
pipe is connected to the valve, the oil will be sucked into the compressor until its pressure reaches the atmospheric
pressure. At this time a close attention should be given so as the air not to be sucked into the oil pipe. Lastly, when
the oil level reaches to the designated position, immediately interrupt the oil valve. After the pressure went up,
open the suction valve and discharge valve and start the chiller.
- Oil change
In normal situation, it is not needed to change oil frequently.
When the chiller's run time reaches 2,000 hours, change oil after the sampling test to judge whether the oil change
is needed. Since oil adding or oil change is a professional work, it should be done experienced and qualified expert.
This chiller is designed to use the oil provided by LG Electronics only.
Monthly inspection
- Compressor monthly inspection standard
- Lubrication system monthly inspection standard
Classification
Inspection item
Inspection method
Standard
Compressor
Motor insulation
100M
Ω
or higher
Startup characteris-
tics
Mark
●
for the corresponding
startup method
1. Direct standing startup
2. Wye-delta startup
* In case the chilled water outlet
temperature is _°C
Startup current flow time
t: 5~25 second
Startup current: A
Timer set value (second)
Figure 61 Compressor monthly inspection standard
Figure 62 Lubrication system monthly inspection standard
* Generally, motor startup current is about 600% for direct standing, 200% for wye-delta, 250% for Condorfer and
400% for Reactor, of the rated current.
* Conduct inspection at least once on a month and record the measurement values.
This data can be a clue to solve problems of the motor.
Classification
Inspection item
Inspection method
Standard
Oil
Oil filling amount
Check through the sight glass
Refer to the standard filling
amount
Summary of Contents for LCWW
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