MCAC-ATSM-2011-12 Air-cooled modular chiller unit 50Hz
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l. All possible water pipes in the system to be chilled should be under heat preservation, including inlet pipes
and flanges of the heat exchanger.
m. The outdoor chilled water pipelines should be wrapped with an auxiliary heating belt for heat preservation,
and the material of the auxiliary heat belt should be PE, EDPM, etc., with thickness of 20mm, to prevent the
pipelines from freezing and thus cracking under low temperature. The power supply of the heating belt
should be equipped with an independent fuse.
n. When the ambient temperature is lower than 2℃, and the unit will be not used for a long time, water inside
the unit should be drained. If the unit is not drained in winter, its power supply should not be cut off, and the
fan coils in the water system must be provided with three-way valves, to ensure smooth circulation of the
water system when the anti-freezing pump is started up in winter.
o. The common outlet pipelines of combined units should be provided with mixing water temperature sensor.
Warning:
● For the water pipeline network including filters and heat exchangers, dreg or dirt may seriously damages
the heat exchangers and water pipes.
● The installation persons or the users must ensure the quality of chilled water, and de-icing salt mixtures
and air should be excluded from the water system, since they may oxidize and corrode steel parts inside the
heat exchanger.
12.2.2 Water Quality
※Water quality control
When industrial water is used as chilled water, little furring may occur; however, well water or river water,
used as chilled water, may cause much sediment, such as furring, sand, and so on. Therefore, well water or
river water must be filtered and softened in softening water equipment before flowing into chilled water
system. If sand and clay settle in the evaporator, circulation of chilled water may be blocked, and thus
leading to freezing accidents; if hardness of chilled water is too high, furring may occur easily, and the
devices may be corroded. Therefore, the quality of chilled water should be analyzed before being used, such
as PH value, conductivity, concentration of chloride ion, concentration of sulfide ion, and so on.
※ Applicable standard of water quality for the unit
PH
value
Total
hardness
Conductivity Sulfide
ion
Chloride
ion
Ammonia
ion
Sulfate
ion
Silicon Iron
content
Sodium ion Calcium
ion
7～
8.5
<50ppm <20μV/cm(25 )℃ No <50ppm No <50ppm <30ppm <0.3ppm No
requirement
<50ppm
12.2.3 Installation & regulation guide for target flow controller
● Please carefully check flow switches before conducting installation of the target flow controller. Packing
should be in good condition, and the appearance should be free of damage and deformation. If any problem,
please contact the manufacturer.
● Flow switches can be installed in the horizontal pipeline or the vertical pipeline with upward flowing
direction but cannot be mounted in the pipeline with downward flowing direction. The inlet water of gravity
should be taken into account when flow switches are installed in the pipeline with upward flowing direction.
● Target flow controller must be installed on a section of straight-line pipeline, and its both ends must be
supplied with straight-line pipes whose length is at least 5 times diameter of the pipe. In the meanwhile, the
fluid flowing direction in the pipeline must be consistent with the direction of arrow on the controller. The
connection terminal should be located where wiring connection can be easily done.
● Pay attention to the following items when conducting installation and wire connection:
a. Collision of the wrench with the soleplate of the flow switch is prohibited, since such collision may cause
deformation and failure of the flow switch.
b. To avoid electric shock and damages to the devices, the power supply should be cut off, when wires are
connected or adjustment is done.
c. When wiring connection is conducted, adjustment of other screws except connection terminals of micro
switches and ground screws is prohibited. In the meanwhile, over great force should not applied when wires
of micro switches are connected, otherwise micro switches may suffer displacement, thus leading to failure
of flow switches.
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