Dimplex WI 40CS, Installation And Operating Instrictions

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E-8
English
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]
Evaluation characteris-
tic
Approximate
concentration
range (mg/l)
Evaluation of
the copper
Substances that can settle (org.) 0
Ammonia NH
3
< 2
2 to 20
> 20
+
0
-
Chloride < 300
> 300 +
0
Electrical conductivity
< 10
μ
S/cm
10 to 500
μ
S/cm
> 500
μ
S/cm
0
+
-
Iron (Fe), dissolved < 0.2
> 0.2 +
0
Free (aggr.) carbonic acid < 5
5 to 20
> 20
+
0
-
Manganese (Mn), dissolved < 0.1
> 0.1 +
0
Nitrate (NO
3
), dissolved < 100
> 100 +
0
PH value < 7.5
7.5 to 9
> 9
0
+
0
Oxygen < 2
> 2 +
0
Hydrogen sulphide (H
2
S) < 0.05
> 0.05 +
-
HCO
3
-/SO
4
2
-
> 1
< 1 +
0
Hydrogen carbonate (HCO
3
-) < 70
70 to 300
> 300
0
+
0
Aluminium (Al), dissolved < 0.2
> 0.2 +
0
Sulphate < 70
70 to 300
> 300
+
0
-
Sulphite (SO
3
), free < 1 +
Chlorine gas (Cl
2
) < 1
1 to 5
> 5
+
0
-