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2
Product description
2.3
The correct fill and make-up water
Note the fundamental system-specific water quality
requirements.
Water designation
Water is used as the heat transfer medium in your heating
system. Depending on its purpose, the water is given
different descriptions.
• Heating water:
Water contained within your heating system.
• Fill water:
Water used for the first filling of your system before
commissioning.
• Make-up water:
Water used for topping up the heating system in case
of water loss.
Overall boiler output
MBH (kW)
341 < Q ≤ 1,194
(100 < Q ≤ 350)
1,194 < Q ≤ 3412
(350 < Q ≤ 1000)
341 < Q ≤ 1,194
(100 < Q ≤ 350)
1,194 < Q ≤ 3412
(350 < Q ≤ 1000)
Tab. 2 Requirements for fill, make-up and heating water
6
Ca (HCO
)
3
2
concentration /
grains per gallon
Maximum fill and make-up water quantity
(ppm)
≤ 11.7 (≤ 200)
≤ 8.8 (≤ 150)
> 11.7 (> 200)
> 8.8 (> 150)
Water quality requirements
All water contains substances, e.g. Ca (HCO
hydrogen carbonate) that could affect the operation of
your heating system. These can cause corrosion, scale
formation or deposits.
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.
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.
B Ask your trained and certified installer or
local water company what the
concentration of Ca (HCO
hydrogencarbonate) is in your area.
B 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.
For the correct use and treatment of the fill and make-up
water, the contents of the following table MUST be
observed.
V
/ gallon ( m³)
max
V
= three times system volume
max
(
Q MBH
---------------------------------------------- -
=
,
⋅
V
0 1818
max
(
Ca HCO
3
(
Q kW
------------------------------------------------- -
=
,
⋅
V
3 13
(
)
max
Ca HCO
3
2
Logano G515 - Subject to technical modifications
)
(calcium
3
2
Heating water
pH value
8.2–9.5
)
gr
------ -
)
2
gal
)
8.2–9.5
(
)
ppm
)
(calcium
3
2
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