Viessmann Vitorond 200 VD2 1080, Service Instructions Manual

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26
Appendix
Water quality requirements
Heating systems with rated operating temperatures up to 100Ă º C
(VDIĂ2035)
Requirements to be satisfied by the heating water
Total rated output of
the heating system
[Q]
Calcium hydrogen
carbonate concentration
[Ca(HCO
3
)
2
] of the fill
and top-up water
Maximum permissible fill
and top-up water volume
[V
max
]
100ĂkW < Q x ă350ĂkW
350ĂkW < Q x 1
Ă
000ĂkW
Ca (HCO
3
)
2
Ă x Ă2.0Ămol/m
3
Ca (HCO
3
)
2
Ă x Ă1.5Ămol/m
3
V
max
Ă[m
3
]Ă=Ăthree times
system volume (or
calculation V
max
as below)
1
Ă
000ĂkW < Q ććć V
max
[m
3
]Ă=
0.0313 ×Ă
Q
.
Ă[kW]
Ca(HCO
3
)
2
Ă[mol ń m
3
]
Heating system with max. flow temperatures above 100Ă º C
Acc. to the VdTÜV data sheetĂ1466,
the following standard values apply
to the water quality for hot water
generators operating in heating
systems with flow temperatures
above 100Ă º C (see also the
explanations in the original
guidelines):
Operation with recirculated water
with low salt content
It follows that only water with a low
salt content should be used as fill or
top-up water, such as desalinated
water, permeate or condensate.
Systems using mixed condensate
generally establish water with low
salt content, if no boiler water is fed
into the system for alkalinization.
Operation with water containing salt
Where possible, use water with a
low salt content, which is at least free
from alkaline earths (softened) as
filling or top-up water.
5692Ă517ĂGB5692Ă517ĂGB
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