Carrier 16LJ-A Series - WATER TREATMENT AND QUALITY GUIDELINES; Cooling System Water Treatment and Importance; Water Quality Analysis and Standards for Cooling Water

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2. Analysis of water quality
Check the water quality of make up water to satisfy the water quality guideline “JRA GL-02-1994”.
About the analysis of water quality, contact a water treatment company.
3. Method of water treatment
(1) Blow down
Manage the recycling water quality to satisfy the water quality guideline “JRA GL-02-1994”.
(2) Addition of anticorrosive
Contact a water treatment company.
4. Precaution
In case of using a black pipe for cooling water line or chilled water line, use an anticorrosive for
black pipe to prevent adherence of the iron rust on copper tubes of the chiller.
(1) Adherence of fouling like the iron rust on copper tube may cause a corrosion. It is necessary to
add an anticorrosive for copper tube. Consult a water treatment company.
(2) Do not install the cooling tower near an exhaust gas outlet or ventilation port. Otherwise, the
quality of cooling water becomes poor and it causes corrosion problems.
(3) In case of installing a heat storage tank in chilled water line, there is a possibility to cause a
corrosion on the tubes by oxygen in chilled water or fouling of the heat storage tank. Install a
heat exchanger between the heat storage tank and the chiller or consult a service agent.
(4) When flashing of piping is performed at the first time, bypass the chiller to prevent foreign matter
from getting into it.
(5) In case of installing the chiller into an existing facility, there is a possibility to prevent a forming
the anti corrosion film on copper tubes by influence of a fouling of the existing piping. Consult
the service agent about the water treatment of post replacement.
5. Water quality standard
Water quality standard is shown below as an extract from JRA-GL02-1994.
Water quality standard for cooling water
Circulation Make up
pH(at 25C(77F)) 6.5 - 8.2 6.0 - 8.0 6.8 - 8.0 Yes Yes
Electrical conductivity 25C ms/m 80 or less 30 or less 40 or less Yes Yes
Chloride ion
mgCl
-
/l
200 or less 50 or less 50 or less Yes
Sulfuric acid ion
mgSO
4
2-
/l
200 or less 50 or less 50 or less Yes
Acid consumption (pH 4.8) mgCaCO
3
/l 100 or less 50 or less 50 or less Yes
Total hardness mgCaCO
3
/l 200 or less 70 or less 70 or less Yes
Calcium hardness mgCaCO
3
/l 150 or less 50 or less 50 or less Yes
Ion silica mgSiO
2
/l 50 or less 30 or less 30 or less Yes
Iron mgFe/l 1.0 or less 0.3 or less 1.0 or less Yes Yes
Copper mgCu/l 0.3 or less 0.1 or less 1.0 or less Yes
Sulfide ion
mgS
2-
/l
No detected No detected No detected Yes
Ammonium ion
mgNH
4
+
/l
1.0 or less 0.1 or less 1.0 or less Yes
Residual chlorine mgCl/l 0.3 or less 0.3 or less 0.3 or less Yes
Free carbon dioxide mgCO
2
/l 4.0 or less 4.0 or less 4.0 or less Yes
Ryzner stability index RSI 6.0 - 7.0 *** *** Yes Yes
StandardReference
Circulation
TendencyCooling water line
Corrosion ScaleOne way