
4.MAINTENANCE B-70254EN/01
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4.5 COOLING WATER
4.5.1 Cooling Water Specification
The quality of cooling water is specified in the table below. If tap
water is used, it should be treated in an ion exchanger.
Refrigerator/air-conditioner cooling water quality standard
(JRA-9001-1980)
pH (25°C) 6.0 to 8.0
Conductivity (25°C) 200µs/cm or less
Chlorine ion Cl
-
20ppm or less
Sulfate ion SO
4
2-
@@
50ppm or less
M alkalinity CaCO
3
@@@ 50ppm or less
Standard item
Total hardness CaCO
3
@@@ 50ppm or less
Iron Fe @@@ 0.3ppm or less
Sulfur ion S
2-
@@
Not to be detected
Ammonia ion NH
4
+
@@@ 0.2ppm or less
Reference
item
Ionic silica SiO
2
@@ 30ppm or less
4.5.2 Anticorrosive
Add the following anticorrosive to cooling water immediately after
installation to prevent problems due to corroding cooling water and to
decrease the frequency of replacement of cooling water.
Consult the chiller manufacturer for use of the anticorrosive.
Product name:
CONTLIME K-6000
Manufacturer:
MITSUBISHI GAS CHEMICAL. ISC
Use:
Add the anticorrosive to cooling water in concentration of 1000
ppm (100 cc/100 liters). Monthly check the concentration of the
anticorrosive using concentration check paper dedicated to
anticorrosives and add the anticorrosive to cooling water until
the concentration reaches about 1000 ppm.
Concentration check paper:
Purchase a concentration check set (50 sheets of check paper, a
dropping pipette, etc.) together with CONTLIME K-6000
(manufactured by Mitsubishi Gas Chemical ISC).
If the above anticorrosive is added to cooling water and the
concentration is controlled, also be sure to replace the cooling water
every year.
[Reference] Cooling water capacity of the oscillator
Model Water capacity
C1000iA
About 5 liters