1 About this manual
Substance in
water
Concentration
mg/l or ppm
Stainless
steel
Copper
Electrical con-
ductivity
<10 μS/cm
+
o
10-500 μS/cm
+
+
>500 μS/cm
+
o
pH value]
<6.0
o
o
6.0-7.5
o/+
o
7.5-9.0
+
+
>9.0
+
o
Ammonia
(NH
4
+
)
<2
+
+
2-20
+
o
>20
+
-
Chloride (Cl
-
)
<300
+
+
>300
o
o / +
Free chlorine
(Cl
2
)
<1
+
+
1-5
+
o
>5
o/+
o / -
Hydrogen sul-
phide (H
2
S)
<0.05
+
+
>0.05
+
o / -
CO
2
<5
+
+
5-20
+
o
>20
+
-
Total hardness
(°dH)
4.0-8.5
+
+
Nitrate (NO
3
)
<100
+
+
>100
+
o
Iron (Fe)
<0.2
+
+
>0.2
+
o
Aluminium (Al)
<0.2
+
+
>0.2
+
o
Manganese
(Mn)
<0.1
+
+
>0.1
+
o
The water quality should be rechecked after 4 to 6
weeks as it may change due to chemical reactions
during the first few weeks of operation.
Electrical conductivity
The probability of corrosion usually decreases with
decreasing electrical conductivity of the heating
water.
Low salt operation - filling with demineralised
water
, see VDI 2035 sheet 2.
Low salt
Electrical conductivity at 25°C
< 100 µS/cm
In the case of low-salt operation, feeding with non-
demineralised water can have a significant effect on
the pH value and push it into a critical range.
►
Check the pH value regularly.
3.8 Information about the hydraulic
connection
Pressure equalisation through expansion tank
–
The expansion tank prevents air from being
drawn in when the system cools down (issue: oxy-
gen input, heating system's fill-up water
)
–
Dimension the expansion tank with a capacity of
12% of the total hydraulic system volume.
–
Secure the expansion tank against shut-off. To do
this, either use the shut-off options on the way to
the expansion tank as cap valves, or unscrew the
hand lever (handwheel) and attach it to the expan-
sion tank with the wire in a clearly visible position.
–
Installation of an expansion tank or a pressure
maintenance system is essential. Use of open
expansion tanks is not permitted.
–
The pressure in the heating system (can be read
off the manometer) and the set pre-pressure in
the expansion tank must be checked regularly.
Install the temperature sensor in the immersion
sleeves
–
Install the flow and return temperature sensor of
the heating system in the immersion sleeves.
–
Exceptions are only permitted in the case of
installation in copper or carbon steel lines. In this
case, correct insulation of the sensor must be
ensured.
Installing the dirt and sludge separator
–
Installation of a filter (<25 μm) is a condition for
guarantee and warranty claims, e.g. use
SOLARFOCUS dirt and sludge separator. This
prevents the ingress of particles into the plate
heat exchanger (condenser).
Return hose version (structure borne sound
decoupling)
–
To prevent structure-borne sound transmission
(and thereby resulting noise), a minimum length
of 30 cm and arched line routing must be obser-
ved for the primary circuit return hose; see infor-
mation on design
8
Installation manual
vampair
