Water Control; Refrigerant Piping; Piping Connection - Hitachi SAMURAI Series Manual

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 filtration 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
Standard Quality pH (25 °C)
Electrical Conductivity (mS/m) (25°C)
{µS/cm} (25 °C)
(2)
Chlorine Ion (mg CI¯/I)
Sulphur Acid Ion (mg SO ¯/I)
2
4
The Amount of Acid Consumption (pH 4.8)
(mg CaCO /I)
3
Total Hardness (mg CaCO /I)
3
Calcium Hardness (mg CaCO /I)
3
Silica L (mg SIO /I)
2
Reference Quality
Total Iron (mg Fe/I)
Total Copper (mg Cu/I)
Sulphur Ion (mg S
¯/I)
2
Ammonium Ion (mg NH /I)
+
4
Remaining Chlorine (mg CI/I)
Floating Carbonic Acid (mg CO /I)
2
Index of Stability

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.
H: Vertical Distance between the Chiller Unit and Remote Condenser
L: Horizontal Distance between the Chiller Unit and Remote Condenser
TCGB0051 rev 0 - 09/2009
34
Chilled Water System
Circulating Water
Supply Water
(20 °C Less than)
6.8 ~ 8.0 6.8 ~ 8.0
Less than 40 Less than 30
Less than 400 Less than 300
Less than 50 Less than 50
Less than 50 Less than 50
Less than 50 Less than 50
Less than 70 Less than 70
Less than 50 Less than 50
Less than 30 Less than 30
Less than 1.0 Less than 0.3
Less than 1.0 Less than 0.1
It shall not be detected.
Less than 1.0 Less than 0.1
Less than 0.3 Less than 0.3
Less than 4.0 Less than 4.0
6.8 ~ 8.0
Install the units in this area
Condenser-less Water Chiller
Installation
Technical Catalogue
Tendency
Corrosion










-

Remote Condenser
Condenser-less Water Chiller
Remote Condenser
(1)
Deposits of Scales







