MCAC-CTSM-2018-1 Flooded type water cooled screw chiller (MIC)
93
Fig.27 Low pressure at full load (standard unit)
Cleaning work must be done a lot of scale is found. Physical and chemical cleaning can be chosen
according to the device you have. Generally, chemical cleaning is much easier to carry out. Methods are
as below. Arrange for a qualified water treatment specialist to develop and monitor a treatment program.
a) Cycle under normal temp. (A):
(Volume of condenser+ volume of pipes+ volume of container)×1/3
Note: concentration of detergent ——33%
b) Cycle under normal temp. (B):
(Volume of cooling tower flume + volume of condenser+ volume of pipes)×1/10
Note: concentration of detergent ——10%
Warning: When you do cleaning while the unit stops, the volume of the cooling tower flume can be 1/2
or 1/3 of rated value. The volume of cooling tower flume should keep at the rated value if cleaning is
performed when the unit is running. Midea assumes no responsibility for pressure vessel damage
resulting from untreated or improperly treated water.
Requirement for cleaning and maintenance
Generates insoluble CaSO
4
Soft fluid deposit may be
caused by ions iron or
aluminum
Water with much Ca
2+
and
Mg
2+
Easily generates hard scale.
Corrosive to copper and
iron.
Water with much SO
4
2-
and
SiO
2
2-
Generates hard CaSO
4
and
CaSiO
2
Generates deposits Fe(OH)
3
and Fe
2
O
3
Generates sulfide, ammonia
and marsh gas, especially
H
2
S which corrodes copper.
Water with organic
substances
Exhaust gas from auto,
chemical factory, plating
Copper tubes of condenser
may be eroded and
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