Specifications

21
WATER QUALITY
Water used in the chilled water, cooling
water, and heat medium circuits may cause
scaling and/or corrosion if not correctly
maintained within specific limits. In some
areas, the water supply may contain
minerals that cause scaling or may be
extremely soft and corrosive. Where these
conditions exist, a water treatment company
should be consulted. If the absorption chiller
is damaged as a result of scaling, corrosion,
or erosion caused by poor water quality
control, the equipment warranty may be void.
Water quality should not exceed the
following limits:
ITEM
CHILLED
WATER
COOLING
WATER
HEAT
MEDIUM
MAKE-UP
WATER
Standard
pH (at 77°F)
6.8 - 8.0
6.5 - 8.2
7.0 – 8.0
6.8 - 8.0
Conductivity (S/cm at 77°F)
400
800
300
300
Chloride ion (Cl
-
ppm)
50
200
30
50
Sulfate ion (SO
4
2-
ppm)
50
200
30
50
M-alkalinity (CaCO
3
ppm)
50
100
50
50
Total hardness (CaCO
3
ppm)
70
200*
70
70*
Calcium hardness (CaCO
3
ppm)
50
150
50
50
Ionic silica (SiO
2
ppm)
30
50
30
30
Reference
Total iron (Fe ppm)
1.0
1.0
1.0
0.3
Copper (Cu ppm)
1.0
0.3
1.0
0.1
Sulfide ion (S
2-
ppm)
ND
ND
ND
ND
Ammonium ion (NH
4
+
ppm)
1.0
1.0
0.1
0.1
Residual chlorine (Cl ppm)
0.3
0.3
0.1
0.3
Free carbon dioxide (CO
2
ppm)
4.0
4.0
0.4
4.0
Ryzner stability index
-
6.0 - 7.0
-
-
NOTES:
1. ND (Not Detectable)
2. *Maximum total hardness of make-up water shall not exceed 70 ppm when bleed off is the only method used to control
water quality.
Table 5 – Water Quality