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Note: 3/8-18 NPT external thread lock shall be screwed on the sensor's casing pipe tightly. This is not marked on
the figure
2.11 Water Treatment
The cooling performance of the unit given in the manual is based on the case where the fouling coefficient is
2
0.018m
°C/kW. Dirt, filth, grease and other impurities will adversely affect the heat exchange effect of the heat
exchanger and the performance of the unit. Foreign matters in chilled water will increase the water pressure drop
of the heat exchanger, reduce the water flow, and cause mechanical damage to the heat exchanger tube bundles,
and even block the water passage.
Please check the water quality of the water system in strict accordance with the water quality requirements of
the unit, so as to ensure that the water quality in the unit meets the requirements in the table.
PH Value（25°C）
Caution:
!
Users shall regularly check the water quality before installation and during operation of the unit.
Please ensure that the water quality meets the requirements in the above table. Once the water
quality exceeds the allowable value for a long time, the heat exchanger may have the problem of
corrosion leakage and serious scaling.
Items with corrosion tendency show that when the water quality exceeds the allowable value for a
long time, it can cause corrosion and leakage of heat exchange tubes, and the failure of unit
operation and affection of normal use;
Items with scaling tendency show that when the water quality exceeds the allowable value for a
long time, it will lead to serious scaling of heat exchanger, affection of heat exchange and direct
reduction of cooling (heating) effect of the unit.
The loss caused by the water quality problem of the user shall be borne by the user.
Cooke Industries - Phone: +64 9 579 2185
Piece 1: the sensor shall be installed with the casing pipe. Its inside and
outside are the 3/8-18 and 1/2-14 NPT threads respectively
Piece 2: 1/2-14 NPT internal thread base. It shall be welded to the main
water pipe
Items
Unit
SO4--
ppm
HCO3-/ SO4--
ppm
Cl-
ppm
PO4
ppm
NH3
ppm
Free Chlorine
ppm
Fe+++
ppm
Mn++
ppm
CO2
ppm
H2S
ppb
Temperature
°C
Oxygen content
ppm
Total hardness
dH
Email: sales@cookeindustries.co.nz
Installation Requirements
Permitted
Values
Corrosion
○
7.5-8.0
○
<100
○
＞1.0
○
<50
○
<2.0
○
<0.5
○
<0.5
○
<0.5
○
<0.05
○
<10
○
<50
○
<65
○
<0.1
4.8-8.5
19
Tendency
Scaling
○
○
Web: www.cookeindustries.co.nz
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