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9.4
9.4 Maintenance
Devices with a minimum of 3kg refrigerant, or hermetically
sealed devices with a minimum of 6 kg refrigerant must be leak-
proof tested yearly by the operator according to ES842/2006.
The leak-proof testing is to be documented and archived for a
minimum of 5 years. The test is to be carried out by certified per-
sonnel only according to (EG) Nr. 1516/2007. The attached table
can be used as a basis for the documentation.
9.5 Water Quality Requirements
Irrespective of any legal regulations, the ground water should not
contain any substances that could form deposits. Iron (< 0.2 mg/
l) and Manganese (< 0.1 mg/l) limit values must be adhered to to
prevent iron ochre sedimentation from forming in the heat source
system.
The use of surface water or water containing salt is not permissi-
ble. Your local water utility can provide you with general informa-
tion regarding the possible use of ground water. Water analyses
are carried out by specially-equipped laboratories.
As a rule, your heat pump system should be equipped with an in-
termediate circuit. Irrespective of any legal regulations, a water
analysis must be carried out if a system is to be operated without
an intermediate circuit to establish conclusively whether the
ground water is compatible for the evaporator of a heat pump
(compare table). If one characteristic is negative "-" or two char-
acteristics are "0", the water quality is not sufficient for the heat
pump.
Table:
Resistance of copper-soldered stainless steel plate heat ex-
changers to substances contained in the water
+
Normally good resistance
0
Corrosion problems can arise,
particularly if several factors receive an evaluation of "0"
-
Should not be used
[<: less than, >: greater than]
E-8
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Evaluation characteris-
Substances that can settle (org.)
Ammonia NH
Chloride
Electrical conductivity
Iron (Fe), dissolved
Free (aggr.) carbonic acid
Manganese (Mn), dissolved
Nitrate (NO
PH value
Oxygen
Hydrogen sulphide (H
HCO
Hydrogen carbonate (HCO
Aluminium (Al), dissolved
Sulphate
Sulphite (SO
Chlorine gas (Cl
Approximate
concentration
tic
range (mg/l)
3
2 to 20
< 10 μ S/cm
10 to 500 μ S/cm
> 500 μ S/cm
5 to 20
), dissolved
3
7.5 to 9
S)
< 0.05
2
> 0.05
2
-/SO
-
3
4
-)
3
70 to 300
70 to 300
), free
3
)
2
Evaluation of
the copper
0
< 2
+
0
> 20
-
< 300
+
> 300
0
0
+
-
< 0.2
+
> 0.2
0
< 5
+
0
> 20
-
< 0.1
+
> 0.1
0
< 100
+
> 100
0
< 7.5
0
+
> 9
0
< 2
+
> 2
0
+
-
> 1
+
< 1
0
< 70
0
+
> 300
0
< 0.2
+
> 0.2
0
< 70
+
0
> 300
-
< 1
+
< 1
+
1 to 5
0
> 5
-
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