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LA 1422C
Filling and supplementary water as well as heating water, depending on
heat output
Overall heat output in kW
50
Specific water content
2
heat generator > 0.3 k per kW
50
Specific water content
2
heat generator > 0.3 k per kW
(e.g. circulation water heaters)
and systems with electrical
heating elements
> 50 kW to 200 kW
> 200 kW to 600 kW
> 600 kW
Heating water, depending on heating output
Operating mode
3
Low-salt
Containing salt
1. For the purpose of calculating the specific system volume, the smallest indi-
vidual heat output is to be used for systems with several heat generators.
2. In systems with several heat generators with different specific water con-
tents, the smallest specific water content is decisive.
3. Full softening is recommended for systems with aluminium alloys.
Fig. 6.1:Guideline values for filling and supplementary in accordance with
VDI 2035
CAUTION!
When using demineralised water, ensure that the minimum
permissible pH value of 8.2 is not undershot. Failure to comply
with this value can result in the heat pump being destroyed.
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Total alkaline earths in mol/m³
(total hardness in dGH)
20
20 to £ 50
50
Specific system volume in l/kW
1
Heat output
3.0 (16.8)
none
3.0 (16.8)
1.5 (8.4)
< 0.05 (0.3)
2.0 (11.2)
1.0 (5.6)
1.5 (8.4)
< 0.05 (0.3)
< 0.05 (0.3)
Electrical conductivity in µS/cm
> 10 to 100
> 100 to 1500
Appearance
clear, free from sedimentary substances
452170.66.02-EN · FD 0305
6.3.2 Corrosion
The VDI 2035 recommends the use of partially demineralised
water or demineralised water in systems with larger-than-aver-
age specific system volumes of 50 l/kW.
These measures (e.g. pH stabilizers) are implemented to set the
pH value of the heating water to minimise the risk of corrosion
in the heat pump and in the heating system.
Irrespective of the legal requirements, the following limit values
in the heating water used for various substances must not be
undershot or exceeded. This is to ensure safe operation of the
heat pump. A water analysis must be carried out before com-
missioning the system. If the water analysis produces a "-" for a
maximum of one indicator or a "o" for a maximum of two indica-
tors, the analysis must be classed as negative.
Evaluation characteristic
-
Bicarbonate (HCO
)
3
2-
Sulphate (SO
)
4
Hydrogencarbonate/sulphate
-
2-
HCO
/SO
3
4
1
Electrical conductivity
2
pH value
+
Ammonium (NH
)
4
-
Chloride ions (Cl
)
Free chlorine (Cl
)
2
Hydrogen sulphide (H
S)
2
Carbon dioxide (CO
)
2
-
Nitrate (NO
)
3
Iron (Fe)
Aluminium (Al)
Manganese (Mn)
English
Stain-
les
Concentration area
s
Copper
(mg/l or ppm)
ste
el
< 70
+
70 - 300
+
> 300
+
< 70
+
70 - 300
o
> 300
-
> 1.0
+
< 1.0
o
< 10 µS/cm
o
10 - 500 µS/cm
+
> 500 µS/cm
o
< 6.0
-
6.0 - 8.2
o
8.2 - 9.0
+
> 9.0
o
< 2
+
2 - 20
o
> 20
-
< 50
+
50 - 150
o
> 150
-
< 0.5
+
0.5 - 5
-
> 5
-
< 0.05
+
> 0.05
+
< 5
+
5 - 10
+
> 10
o
< 100
+
> 100
o
< 0.2
+
> 0.2
o
< 0.2
+
> 0.2
+
< 0.05
+
> 0.05
o
o
+
o
+
o/-
-
+
-
o
+
o
-
o
+
o
+
o
-
+
o
-
+
o
-
+
o/-
+
o
-
+
o
+
o
+
o
+
o
EN-9
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