Air Source Screw Water Chiller Unit – Installation Operation and Maintenance Manual
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.3 Procedure for Replacing the Dry FilterElement
Turn off the shutoff valves on both ends of the drier-filter (if the shutoff valve is available only on one
end, recycle refrigerants).
Vent a slight amount of refrigerants out of the drier-filter.
Open end caps of the drier-filter.
Replace the old dry filter element with a new one.
Reinstall the end caps of the drier-filter (check whether the gasket is damaged during removal) and
tighten the bolts.
Evacuate certain sections of the drier-filter.
Turn on the shutoff valves to make startup ready.
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.4 Lubricant
MLSC_A
series air-source screw water chiller units have been charged with sufficient lubricant before
they leave the factory.
Model of the lubricant: BSE170
Viscosity: 170
If the water chiller unit in long-term use fails to start or stop upon the low oil level alarm, the causes will be:
Lubricants have entered the refrigerant system and need to be recovered.
Lubricant is undercharged and the following measures are required.
Measures:
Keep the water chiller unit running at full load for one and a half hours. Check whether the oil level of
the compressor rises.
Restart the water chiller unit and ensure that it operates properly. If the oil level is still low, the lubricant
in the unit is undercharged.
If the internal pressure of the compressor is 0 bar, charge lubricants for the compressor using its oil
filler plug. If the internal pressure of the compressor is higher than 0 bar, charge lubricants for the
compressor using an oil filling machine.
Use the lubricant brand defined in the technical specifications when maintaining or charging lubricants.
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.5 Charging and Evacuating Refrigerants
Refrigerants have been charged in the
MLSC_A
series air-source screw water chiller units before the
units leave the factory, and passed the units' performance test. This section describes how a professional
from the service department charges refrigerants to a moderate level after replacing certain components
of the units for maintenance.
