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Flooded type water cooled screw chiller (MIC)
MCAC-CTSM-2018-1
84
be full of oil.
When the unit is running stably, the oil level in the high oil immersion lens should be at least above the
1/2 position. There must be no deterioration (blackness) in the lubricating oil, or else, qualified lubricating
oil must be changed before operating the unit.
6) Inspect whether the pressure sensor stop valve, dry filter front/rear angle valve and liquid/air sampling
stop valve are all open.
When the unit stops, the high and low voltages must be almost the same. After start-up, the low voltage
decreases, and the high voltage increases. If there is no voltage change a certain time after start-up,
inspect whether the liquid/air sampling stop valve is open.
7) After the unit is installed and before it is connected, tighten the connections in the electrical cabinet of
the unit one by one.
8) Inspect the bolts of the unit for looseness.
After the unit is transported and installed, inspect whether the fixing bolts of the unit (e.g. fixing bolts at
compressor base angle, at post and beam of the unit, and at pipe clamp, etc.) and of the electrical
elements (e.g. fixing bolts of PCB and insulating transformer, and connection bolts of upper/lower
terminals of AC contactor, etc.) are firmly fixed.
9) Inspect the connections in the electrical cabinet for looseness, especially the electric part in the
cabinet. The parts connected by bolts might become loose due to transportation. If there is any
looseness, tighten them to avoid burnout of circuit or element caused by poor contact.
Inspect the terminals for looseness and poor contact caused by vibration and collision during
transportation and installation (especially electric parts; ensure the connection points of all terminals are
firm and reliable before electrification).
Inspect whether there is poor contact and short circuit caused by dust, moisture, etc. in the electrical
The oil must be full in stop
status of the unit, and above
the 1/2 position in stable
operation.
All connection points
of terminals must be
firm and reliable.
Inspect all terminals
for
firmness
and
reliability
before
electrification.