
Y2
Safety solenoid valve
Y3
Variable-voltage solenoid
STB
Safety thermostat
5.10 Filling the system
5.10.1.
Water treatment
In most cases, the boiler and the central heating installation can be
filled with normal tap water and no water treatment will be necessary.
WARNING
Do not add chemical products to the central heating water
without first consulting a water treatment professional. For
example: antifreeze, water softeners, products to increase
or reduce the pH value, chemical additives and/or
inhibitors. These may cause faults in the boiler and
damage the heat exchanger.
4
Flush the central heating installation with at least 3x
the volume of the central heating installation. Flush
the DHW pipes with at least 20 times the volume of
the pipes.
For an optimum functioning of the boiler, the water of the installation
must comply with following characteristics:
Total installed heat output (kW)
≤ 70
Degree of acidity (water non-treated) pH
6,5 - 8,5
Degree of acidity (water treated)
pH
7 - 9
Conductivity at 25°C
µS/cm
≤ 500
Chlorides
mg/l
≤ 50
Other components
mg/l
< 1
Total water hardness
°f
5- 35
°dH
2,8 - 20,0
mmol/l
(1)
0,5 - 3,5
(1) Flow temperature lower than 90°C - Maximum hardness: 1,50 mmol/l
If a water treatment is necessary,
De Dietrich
Thermique
recommends the following manufacturers:
4
Cillit
4
Climalife
4
Fernox
4
Permo
4
Sentinel
AFC 18 - AFC 24 - AFC 30
5. Installation
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