Water Control; Water Piping Connection - Hitachi RASM-3VNE Instruction Manual

DRAIN PIPING

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
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
The Amount of Acid Consumption (pH 4.8)
(mg CaCO /I)
3
Total Hardness (mg CaCO
Calcium Hardness (mg CaCO
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
Remaining Chlorine (mg CI/I)
Floating Carbonic Acid (mg CO
Index of Stability
?
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
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.
16 PMML0342B rev.1 - 03/2016
Circulating Water
(20 C Less than)
6.8 ~ 8.0
Less than 40
Less than 400
Less than 50
¯/I) Less than 50
2
4
Less than 50
/I) Less than 70
3
/I) Less than 50
3
Less than 30
Less than 1.0
Less than 1.0
/I) Less than 1.0
+
4
Less than 0.3
/I) Less than 4.0
2
6.8 ~ 8.0
Chilled Water System
Supply Water
6.8 ~ 8.0
Less than 30
Less than 300
Less than 50
Less than 50
Less than 50
Less than 70
Less than 50
Less than 30
Less than 0.3
Less than 0.1
It shall not be detected.
Less than 0.1
Less than 0.3
Less than 4.0
-
Description
Water
Water Inlet
outlet
Water Outlet
For suspending
heavies
Tendency
(1)
Deposits of
Corrosion
Scales
Connection size
Rp1"
Rp1"
For piping along For instant
the wall
installation work