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SPACE HEATING/COOLING AND DHW
the tendency of corrosion or deposits of scales.
the former unit.
9.4 WATER CONTROL
It is necessary to analyze 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
Corro-
sion
Depos-
its 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¯/L)
Less than 50 Less than 50
Sulphur Acid Ion
(mg H
4
SO¯/L)
Less than 50 Less than 50
The amount of Acid
consumption (pH
4.8) (mg CaCO
3
/L)
Less than 50 Less than 50
Total Hardness
(mg CaCO
3
/L)
Less than 70 Less than 70
Calcium Hardness
(mg CaCO
3
/L)
Less than 50 Less than 50
Silica L (mg SIO
2
/L)
Less than 30 Less than 30
Reference Quality
Total Iron (mg Fe/L)
Less than 1.0 Less than 0.3
Total Copper
(mg Cu/L)
Less than 1.0 Less than 0.1
Sulphur Ion (mg S
2¯
/L)
It shall not be detected
Ammonium Ion
(mg NH
4
+
/L)
Less than 1.0 Less than 0.1
Remaining
Chlorine (mg CI/L)
Less than 0.3 Less than 0.3
Floating Carbonic
Acid (mg CO
2
/L)
Less than 4.0 Less than 4.0
Index of Stability 6.8 ~ 8.0 -
DHW tank for heat pump type heating system shall be
selected according to the requirements in this instruction and
on-site use requirements.
If the selection, installation and wiring are not carried out
according to the requirements in this instruction, we would not
be responsible for the problems caused by the DHW tank.
Hot water may cause serious burns. Test water temperature
Connecting of water pipe with tap water pipe should be
according to local regulations and standards.
When the high domestic hot water temperature can be
supplied) shall be installed at the hot water outlet connection
of the DHW tank. This mixing valve shall secure that the
hot water temperature at the hot water tap never rise above
a set maximum value. This maximum allowable hot water
temperature shall be selected according to the applicable
legislation.
DHW tank selection (Storage capacity)
When selecting a tank for DHW operation, take into
consideration the following points:
- The volume of the tank has to meet with the daily
consumption in order to avoid stagnation of water.
- Fresh water must circulate inside the DHW tank water
after the installation has been performed. Additionally,
consumption of DHW during long periods of time.
- Try to avoid long runs of water piping between the tank
and the DHW installation in order to decrease possible
temperature losses.
- lf the domestic cold water entry pressure is higher than
the equipment’s design pressure, an adequate pressure
reducer must be installed to ensure that the maximum
pressure is NOT exceeded.
9.5 DHW TANK SELECTION
Item
DHW
space
Tendency
(1)
Water
supplied
Corrosion
Deposits
of scales
Electrical Conductivity
(mS/m) (25°C)
(2)
100~2000
Chlorine Ion (mg CI¯/L) Max 250
Sulphate (mg/L) Max 250
Combination of chloride
and sulphate (mg/L)
Max 300
Total Hardness
(mg CaCO
3
/L)
60~150
treatment with chemicals before application as treated water.
No antifreeze agent shall be added to the water circuit.
To avoid deposits of scale on the heat exchangers surface it
is mandatory to ensure a high water quality with low levels of
.
To prevent the storage tank from corrosion, the electronic
anode(optional accessory) can be installed.
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