Midea LSBLG255/MZ, Technical & Service Manual

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DX type water-cooled screw chiller (PCB Control) MCAC-CTSM-2014-03
98
a) Cycle under normal temp. (A):
(Volume of co 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 co volume of pipes)×1/10
Note: concentration of detergent
——10%
Warning : When doing cleaning with unit stops, volume of cooling tower flume can be 1/2 or 1/3 of rated
value; but if doing cleaning with unit is runs, the volume of cooling tower flume should keep rated value.
Midea assumes no responsibility for pressure vessel damage resulting from untreated or improperly
treated water.
Requirement for cleaning and maintenance
Water quality Scale Corrosion Remark
1
PH≤6 Acid water
Hard Strong
Generates insoluble
CaSO
4
2
PH≥8 Alkali water
Soft
——
Soft fluid deposit may be
caused by ions iron or
aluminum
3
Water with much Ca
2+
and
Mg
2+
Hard
——
Easily generates hard
scale.
4 Water with much Cl
-
Dirt Ultra-strong
Corrosive to copper and
iron.
5
Water with much SO
4
2-
and
SiO
2
2-
Hard Strong
Generates hard CaSO
4
and CaSiO
2
6
Water with much Fe
3+
Large quantity,
hard
Strong
Generates deposits
Fe(OH)
3
and Fe
2
O
3
7 Odorous water Large quantity Ultra-strong
Generates sulfide,
ammonia and marsh gas,
especially H
2
S which has
great corrosion to copper.
8
Water with organic
substance
Large quantity
——
Easily generates scale
9
Exhaust gas from auto,
chemical factory, plating
factory, sewage plant,
ammonia refrigeration plant
and fiber factory
--
Strong
Copper tubes of condenser
may be eroded and
perforated.
10
Dusty places such as plastic
plant
Large quantity -- --
11 Sulfurous gas in the air Ultra-strong --
12
Natural pollution such as
damp air near the coast or
insects in the field goes into
cooling tower.
Large quantity
Strong
--
Cycle under normal temp. (A):
(Capacity of co Capacity of pipe+ Capacity of container)×1/3(Thickness of detergent 33%)
Cycle under normal temp. (B):
(Capacity of flume of cooling tower+ Capacity of co Capacity of pipe)×1/10(Thickness of
detergent 10%)