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9.3 Cleaning the heat source
system
ATTENTION!
The supplied strainer must be fitted in the heat source inlet of the heat
pump in order to protect the evaporator against the ingress of impurities.
A dirt trap is installed in the heat source inlet of the heat pump in
order to protect the evaporator against contamination. When the
system is first put into operation, the filter screen of the dirt trap
should be cleaned at relatively short intervals. These intervals
can be prolonged once the amount of impurities detected decre-
ases.
9.4 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]
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Approximate
Evaluation characteris-
concentration
tic
range (mg/l)
Substances that can settle (org.)
Ammonia NH
3
Chloride
Electrical conductivity
10 to 500 μ S/cm
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
9.5 Maintenance
According to regulation (EC) No. 842/2006, all refrigerating cir-
cuits with a minimum refrigerant quantity of 3kg, or of 6 kg in the
case of "hermetically sealed" refrigerating circuits, must be
tested for leaks by the operator every year.
The leak test must be documented and archived for a minimum
of 5 years. The test is to be carried out by certified personnel
only, according to regulation (EC) No. 1516/2007. The table en-
closed in the appendix can be used as a basis for the documen-
tation.
9.5
Evaluation of
the copper
0
< 2
+
2 to 20
0
> 20
-
< 300
+
> 300
0
< 10 μ S/cm
0
+
> 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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