8.4 WATER CONTROL
It is necessary to analyse the quality of water by checking pH, electrical conductivity, ammonia ion content, sulphur content, and
others. 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
-
?
N O T E
• (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.
8.5 WATER PIPING CONNECTION
Piping location and connection size
The unit is factory supplied with two unions to be connected to the water inlet/outlet pipe. Refer to the next figure detailing the
location of the water pipes location, dimensions and connection sizes.
Water inlet
Water
outlet
Description
Connection size
Water Inlet
Rp1”
Water Outlet
Rp1”
8.6 SUSPENSION OF WATER PIPING
Suspend the refrigerant and water piping at certain points and
prevent the refrigerant and water piping from being in direct
contact with the building: walls, ceilings, etc…
If there is direct contact between pipes, abnormal sound may
occur due to the vibration of the piping. Pay special attention in
cases of short piping lengths.
Do not fix the refrigerant and water pipes directly with the metal
fittings (refrigerant piping may expand and contract).
Some examples for suspension method are shown below.
For suspending
heavies
For piping along
the wall
For instant
installation work
DRAIN PIPING
PMML0342B rev.1 - 03/2016
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