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INSTALLATION
Installation
Thermal insulation
f Insulate the DHW line against heat loss in accordance with
f
locally applicable regulations.
DHW circulation
The heat losses incurred in the DHW circulation line and the elec-
trical power consumption of the circulation pump reduce the effi-
ciency of the system. The cooled water in the DHW circulation line
mixes with the cylinder content. Avoid installing a DHW circulation
line. Where that is not possible, the DHW circulation pump must
be controlled thermally or by time switch.
Gravity brake
To prevent thermal DHW circulation, you should install a gravity
brake between the appliance and the DHW cylinder, depending
on your hydraulic connection (see chapter "Connection to the DHW
cylinder").
Water treatment and application limits
Depending on water temperature and hardness, the following
water treatments should be carried out according to DIN 1988-
200:2012-05:
dH [°]
DHW temperature < 60 °C
0-8.4
No water treatment necessary Periodic descaling recommended
(soft)
8.4-14
No water treatment necessary Periodic descaling necessary (see
(medium)
14-21
Periodic descaling necessary
(hard)
(see chapter "Descaling the
appliance")
>21
Softening
Where water quality fluctuates significantly and the DHW temper-
atures are high (> 60 °C), we recommend annual inspection by a
qualified contractor.
Water constituent
Concentration
(mg/l or ppm)
-
Alkalinity (HCO
)
< 70
3
70-300
> 300
[1]
2-
Sulphate
(SO
)
< 100
4
< 200
> 200
2-
HCO
-/SO
> 1.0
3
4
< 1.0
Electrical conductivity
< 10 µS/cm
10-500 µS/cm
> 500 µS/cm
[2]
pH
< 7.0
7.0-9.0
> 9.0
+
Ammonium (NH
)
4
2-20
> 20
Chloride (Cl)
< 100
100-200
> 200
Free chlorine (Cl
)
2
Hydrogen sulphide (H
S)
< 0.05
2
> 0.05
www.stiebel-eltron.com
DHW temperature > 60 °C
(see chapter "Descaling the ap-
pliance")
chapter "Descaling the appliance")
Softening
Use is not recommended
Reduce the DHW temperature
Time limits
Investigation time
following sampling
0
within 24 h
+
0
+
No limit
0
-
+
No limit
-
0
No limit
+
0
0
within 24 h
+
0
< 2
+
within 24 h
0
-
+
No limit
0
-
<1
+
within 5 h
1-5
0
>5
-
+
No limit
-
Water constituent
Concentration
(mg/l or ppm)
Free (aggressive)
carbon dioxide (CO
)
5-20
2
> 20
Total hardness (°dH)
4-14
[1]
Nitrate
< 100
> 100
[3]
Iron
(Fe)
< 0.2
> 0.2
Aluminium (Al)
< 0.2
> 0.2
[3]
Manganese
(Mn)
< 0.1
> 0.1
+ Resistance under normal conditions
0 Corrosion may occur, especially if other factors are rated as 0
- Use is not recommended
[1] Sulphates and nitrates act as inhibitors of pitting corrosion
caused by chloride in pH-neutral environments
[2] Generally, a low pH value (below 6) increases the risk of
corrosion. A high pH value (above 7.5) reduces the risk of
corrosion.
+
+
[3] Fe
and Mn
are strong oxidising agents and can increase
3
4
the risk of local corrosion in stainless steel.
SiO
above 150 ppm increases the risk of scale build-up
2
Material losses
!
To prevent damage to the plate heat exchanger, ensure
that the water is free from contamination (e.g. sludge,
sediment).
f If necessary, install a filter in the cold water supply
f
line.
10.3.1 Connection to the DHW cylinder
You have various options for connecting the appliance to your
DHW cylinder.
Note
Observe the information and limitations in the chapter
"Specification / Hydraulic connection diagram".
Note
To determine the maximum length of the connection line
between the appliance and DHW cylinder, it may be nec-
essary to subtract higher pressure drop values from the
residual head of the internal circulation pump, subject to
the type of hydraulic connections employed.
Time limits
Investigation time
following sampling
< 5
+
No limit
0
-
No limit (see chapter
"Water treatment")
+
No limit
0
+
No limit
0
+
No limit
0
+
No limit
0
WWS 20 |
53
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