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3
Using correct fill and make-up water
3.2
Water quality
All water contains substances, e. g. Ca (HCO
(calcium hydrogen-carbonate), which may influence the
function of your heating system. These may lead to
corrosion, scaling and other deposits.
Regularly check your water consistency and, if
necessary, treat your fill and make-up water, to ensure
that your heating system remains economic, functional,
operationally reliable and energy efficient.
SYSTEM DAMAGE
through corrosion and scaling because of
fill and make-up water, which does not
CAUTION!
comply with system-specific requirements.
Check with your local heating
contractor or your water supply
company regarding the Ca (HCO
concentration (calcium hydrogen-
carbonate) in your area.
You should treat the fill and make-up
water, if it does not comply with system-
specific requirements. In such cases
contact your local heating contractor.
Observe the following table regarding the correct use
and treatment of the fill and make-up water.
This table is an extract from the Code of Practice K8
"Water treatment for hot water heating systems" and the
VDI 2035 "Water treatment guideline".
Total rated boiler
Ca (HCO
output in MBH
300 < Q ≤ 1600
1601 < Q ≤ 3500
300 < Q ≤ 1600
1601 < Q ≤ 3500
Table. 1 Requirements of filling, make-up and heating water
We reserve the right to make any changes due to technical modifications.
8
)
3
2
)
3
2
)
concentration
Maximum fill and make-up water volume
3
2
in mol/m³
≤ 2.0
≤ 1.5
> 2.0
> 1.5
Operating instructions condensing gas boiler Logano plus SB735 • Issue 10/2003
V
in m³
max
V
= three times the system volume
max
(
Q kW
⋅
------------------------------------------------ -
V
=
0 0313
,
max
(
Ca HCO
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
Heating water pH
value
8.2–9.5
)
⎛
⎞
mol
)
--------- -
8.2–9.5
⎝
⎠
3
2
3
m
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