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Product description
G315 – 6 720 817 940 (2016/04) 5
Water quality requirements
All water contains substances, e.g. Ca (HCO
3
)
2
(calcium hydrogen
carbonate) that could affect the operation of your heating system. These
can cause corrosion, scale formation or deposits potentially affecting
the system's service life and/or system efficiency.
To ensure your heating system always operates economically, properly
and safely, not to mention in an energy-efficient manner, we recommend
that you regularly monitor the quality of the fill and make-up water and
treat it accordingly as and when necessary.
For the correct use and treatment of the fill and make-up water, the
contents of the following table MUST be observed.
2.4 The correct fuel
To ensure it operates properly, the heating system requires fuel of the
correct type and grade.
NOTICE: System damage from corrosion or scale
formation as the result of using fill and make-up water
that does not conform to the system-specific
requirements.
Ask your trained and certified installer or local water
company what the concentration of Ca (HCO
3
)
2
(calcium hydrogen carbonate) is in your area.
If the fill and make-up water does not meet system-
specific requirements, it will have to be treated.
Consult your trained and certified installer if this is
the case.
Overall boiler output
MBH (kW)
Ca (HCO
3
)
2
concentration /
grains per gallon (mol/ppm)
Maximum fill and make-up water quantity
V
max
/ gallon ( m³)
Heating water
pH value
341 < Q 1,194 (100 < Q
350)
11.7 (200) V
max
= three times system volume 8.2–9.5
1,194 < Q 3412 (350 < Q
1000)
8.8 (150)
341 < Q 1,194 (100 < Q
350) > 11.7 (> 200)
8.2–9.5
1,194 < Q 3412 (350 < Q
1000)
> 8.8 (> 150)
Table 2 Requirements for fill, make-up and heating water
V
max
0 1818
QMBH
Ca HCO
3

2
gr
gal
---------


------------------------------------------------------
V
max
313
QkW
Ca HCO
3

2
ppm
----------------------------------------------------------
=


=
NOTICE: Risk of system damage from use of incorrect
fuel.
Only use the fuel specified. The correct fuel is
entered in Tab. 3 by the heating contractor.
Use the following fuel:
Stamp/Signature/Date
Table 3 Fuel to be used (entered by heating system installer)
We recommend you seek the advice of your system
installer if you intend changing the fuel for your system.
5


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