Midea LSBLG255/MZ, Техническое и сервисное руководство

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MCAC-CTSM-2014-03 DX type water-cooled screw chiller (PCB Control)
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3) Sufficient lubricating oil in the oil tank (not lower than 1/2 of the oil level in the high oil
immersion lens), and no deterioration (blackness).
Inspect the oil level and quality before start-up for the two factors have direct impact on the
performance and reliability of the unit. There must be sufficient lubricating oil in the unit. And
during the shutdown of the unit, the high oil immersion lens must be full of oil.
When the unit is in stable operation, the oil level in the high oil immersion lens should be at
least above the 1/2 position. And there shall be no deterioration (blackness) of the lubricating oil,
or else, qualified lubricating oil shall be changed before operating the unit.
4) Inspect whether the dry filter front/rear angle valve and liquid/air sampling shut valve etc. are all
opened.
When the unit stops, the high and low voltages shall be almost the same. After the start-up, the
low voltage decreases, and the high voltage increases. If there is no voltage change certain
time after the start-up, inspect whether the liquid/air sampling stop valve is open.
5) After the unit is installed and before connected, it is principle required to tighten the connections
in the electrical cabinet of the unit one by one.
6) Inspect the bolts of the unit for looseness.
After the unit is transported and installed, it is required to 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 of insulating transformer, and
connection bolts of upper/lower terminals of AC contactor, etc.) are firmly fixed.
7) Inspect the connections in the electrical cabinet for looseness, especially the electric part in the
cabinet. The parts connected by bolts might be loose due to transportation. If there is any
looseness, tighten it 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 the electric part; ensure the connection points of all
The oil must be full in
stop status of the
unit, and above the
1/2 position in stable
operation.
The color is indicated in the
center and compared with
the color card around it to
reflect the moistness in the
system.