Installation
Technical Catalogue
TCGB0051 rev 0 - 09/2009
34
6.4. Water control
CAUTION:
When industrial water is applied for chilled water and condenser water, industrial water rarely causes deposits of scales or
other foreign substances on equipment. However, well water or river water may in most cases contain suspended solid matter,
organic matter, and scales in great quantities. Therefore, such water should be subjected to ltration or softening treatment with
chemicals before application as chilled water.
It is also necessary to analyse the quality of water by checking pH, electrical conductivity, ammonia ion content, sulphur content,
and others, and to utilise industrial water only if problem is encountered through these check.
The following is the recommended standard water quality.
Item
Chilled Water System Tendency
(1)
Circulating Water
(20 °C Less than)
Supply Water Corrosion Deposits of Scales
Standard Quality pH (25 °C) 6.8 ~ 8.0 6.8 ~ 8.0
Electrical Conductivity (mS/m) (25°C)
{µS/cm} (25 °C)
(2)
Less than 40
Less than 400
Less than 30
Less than 300
Chlorine Ion (mg CI¯/I) Less than 50 Less than 50
Sulphur Acid Ion (mg SO
4
2
¯/I) Less than 50 Less than 50
The Amount of Acid Consumption (pH 4.8)
(mg CaCO
3
/I)
Less than 50 Less than 50
Total Hardness (mg CaCO
3
/I) Less than 70 Less than 70
Calcium Hardness (mg CaCO
3
/I) Less than 50 Less than 50
Silica L (mg SIO
2
/I) Less than 30 Less than 30
Reference Quality
Total Iron (mg Fe/I)
Less than 1.0 Less than 0.3
Total Copper (mg Cu/I) Less than 1.0 Less than 0.1
Sulphur Ion (mg S
2
¯/I) It shall not be detected.
Ammonium Ion (mg NH
4
+
/I) Less than 1.0 Less than 0.1
Remaining Chlorine (mg CI/I) Less than 0.3 Less than 0.3
Floating Carbonic Acid (mg CO
2
/I) Less than 4.0 Less than 4.0
Index of Stability 6.8 ~ 8.0 -
NOTE:
1. The mark “” in the table means the factor concerned with the tendency of corrosion or deposits of scales.
2. The value showed in “{ }” are for reference only according to the former unit.
6.5. Refrigerant piping
6.5.1. Piping Connection
The refrigerant piping between the water chiller, and the remote condenser should be designed by using the
following chart.
Install the units in this area
Remote Condenser
Remote Condenser
Condenser-less Water Chiller
Condenser-less Water Chiller
H: Vertical Distance between the Chiller Unit and Remote Condenser
L: Horizontal Distance between the Chiller Unit and Remote Condenser
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