4.9.1 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 manufac-
turer.
4.9.2 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.
Fig. 4-6
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Schematic diagram of target flow controller
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O&I manual
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4.9.3 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 connectioncan
be easily done.
4.9.4 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.
d. Special grounding screws should be used for earth connection.
Bolts should not be installed or removed at will; otherwise flow
switches may suffer deformation and failure.
e. Flow switches have been set at minimal flow value prior to
ex-factory. They should not be adjusted below the ex-factory setting
value, or they may suffer failure. After installing flow switches,
please press the flow switch lever several times to check them.
When the lever is found not to respond with “clatter”, rotate the
screw in a clockwise direction, until “clatter” occurs.
f. Be sure to determine the model of target slice according to the
rated flow of the unit, the diameter of the outlet pipe and the
adjustment range of the target slice of the flow switch. Besides, the
target slice should not contact with other restrictors in the pipeline
or on the inner wall of the pipeline, or the flow switch cannot be
reset normally.
4.9.5 Determine whether the flow switch and the system connected
with it are in good operation according to the measured value by
flow meter, namely, when the measured value on flow meter is less
than 60% of rated water flow of the unit, the target flow controller
should be cut off and observed for 3 working periods, and it should
be covered with flow switch shell timely.
Fig. 4-5
$
$
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4.9 Installation & regulation guide for target flow
controller
<50ppm
<50ppm
<30ppm
<200
μ
V/cm
đ
<0.3ppm
<50ppm
<50ppm
4.8.2 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
No
No
No requirement
Table 4-2
7
Њ
8.5
4.8 Water quality control
4.8.1 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.
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