Weishaupt thermo condens WTC 15-A, Installation And Operating Instructions Manual, Page: 17 / 94

17
3
Note: In accordance with VDI-Guideline 2035
the following demands must be met by the
heating water.
• The untreated fill and top up water must be of
domestic water quality (colourless, clear, without
scaling),
• the fill and top up water must be pre-filtered
(mesh width max. 25 µm),
• the pH value must be 8.5 ± 0.5,
• avoiud oxygenation of the heating water
(max. 0.05 mg/l),
• if any system components are not diffusion resistant
the unit should be separated from the heating circuit
using a system separator.
3.5 Demands on the heating water
3.5.1 Permissible water hardness
The permissible water hardness is determined relative to
the fill and top up water quantity.
☞
Determine if measures for water treatment are
necessary using the diagram.
If the fill and top up water lies in the range of the upper limit
curve:
☞
Treat fill and top up water.
If the fill and top up water lies in the range of the lower limit
curve, the water does not need to be treated.
Note: Document fill and top up water quantity.
0 200 400 600 800 1000 1200 1400 1800 1600
0
5
10
15
20
25
30
Max. total hardness of heating water for WTC 15-A
Fill and top up water quantity [ l ]
To
ta
l har
dness [°dH]
0 200 400 600 800 1000 1200 1400 1800 1600
0
5
10
15
20
25
30
Max. total hardness of heating water for WTC 25-A
Fill and top up water quantity [ l ]
To
ta
l har
dness [°dH]
0 200 400 600 800 1000 1200 1400 1800 1600
0
5
10
15
20
25
30
Max. total hardness of heating water for WTC 32-A
Fill and top up water quantity [ l ]
To
ta
l har
dness [°dH]