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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
Evaluation characteris-
tic
Substances that can settle (org.)
Ammonia NH
3
Chloride
Electrical conductivity
Iron (Fe), dissolved
Free (aggr.) carbonic acid
Manganese (Mn), dissolved
Nitrate (NO
), dissolved
3
PH value
Oxygen
Hydrogen sulphide (H
S)
2
2
HCO
-/SO
-
3
4
Hydrogen carbonate (HCO
-)
3
Aluminium (Al), dissolved
Sulphate
Sulphite (SO
), free
3
Chlorine gas (Cl
)
2
Approximate
Evaluation of
concentration
the copper
range (mg/l)
0
< 2
+
2 to 20
0
> 20
-
< 300
+
> 300
0
< 10 μ S/cm
0
10 to 500 μ S/cm
+
> 500 μ S/cm
-
< 0.2
+
> 0.2
0
< 5
+
5 to 20
0
> 20
-
< 0.1
+
> 0.1
0
< 100
+
> 100
0
< 7.5
0
7.5 to 9
+
> 9
0
< 2
+
> 2
0
< 0.05
+
> 0.05
-
> 1
+
< 1
0
< 70
0
70 to 300
+
> 300
0
< 0.2
+
> 0.2
0
< 70
+
70 to 300
0
> 300
-
< 1
+
< 1
+
1 to 5
0
> 5
-
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