Information About Water Treatment - Wolf MGK-2-390 Installation Instructions Manual

The system must be cleaned / flushed thoroughly before
c o m m i s s i o n i n g a n d a s l u d g e f i l t e r / d i r t t r a p
(e.g. Wolf accessory, <500 μm = 0.5 mm mesh width MW)
installed in the return line. This must be in close proximity to
the heating appliance and at the lowest position in the heating
system.
The fill and top-up water must only be treated with a
desalination process. The "Maximum permissible total
hardness" table shows the degree to which water treatment is
required.
The system water must not fall below a total hardness of 2°dH,
which corresponds to conductivity of ≈ 60 μS/cm. The max.
permissible total hardness and the corresponding max.
conductivity are system-specific and must be calculated (see
also "Maximum permissible total hardness" table). The
desalinated water (conductivity <= 30 μS/cm) must not be
mixed with untreated DHW.
The addition of chemicals or de-scaling using single-stage ion
exchangers is not permissible, as system damage due to water
leaks may occur.
We recommend regular emptying of the sludge filter.
The operator must ensure that the heating system is maintained
and serviced regularly to maintain its energy quality (see
EnEV).
The Wolf system and operator's log for treatment of
heating water must be kept in a safe place and made
available by the owner / operator. It is provided along with
these installation instructions.
Maximum permissible total hardness table:
Limits depending on the spec. system volume VS (VS = system volume / lowest individual output)
Total hardness conversion: 1 mol/m³ = 5.6°dH
Total hardness / total
alkaline earths
[kW] [°dH]
1* < 50 2 - 16.8*
2 50-200 2 - 11.2
3 200-600 2 - 8.4
4 > 600 2 - 3
*) for system boiler (<0.3 l/kW) and systems with electric heating elements
Gradual increase in the requirement for the spec. system volume (VS = system volume / lowest individual output) and the total
heating output.
The total amount of fill water over the life cycle of the appliance must not exceed three times the nominal volume of the heating
system.
Please note: The total hardness must not fall below 2°dH.
3063772_201507

10. Information about water treatment

VS ≤ 10 l/kW
Conductivity
[mol/m³] C [μS/cm]
0.36 - 3.0* 60 - 500
0.36 - 2.0 60 - 300
0.36 - 1.5 60 - 200
0.36 - 0.54 60 -100
Treatment of heating water in accordance with VDI 2035:
We recommend a heating water pH value of between 8.2 and
8.5, also in mixed installations with various materials.
Request a water analysis from the water utility company. This
must test whether the total hardness is sufficiently low.
For a specific system volume of V
lowest limit from the table below must be applied,
for V >= 20 l/kW the next but one lowest limit, and for
S,specific
V >= 40 l/kW the lowest limit.
S,specific
For a specific system volume of >50 l/kW, the total hardness
must be adjusted to 2-3°dH using a desalination process. This
corresponds to conductivity of 60 - 100 μS/cm.
If the heating appliance is integrated in the system without a
hydraulic low loss header, the total hardness must be adjusted
to 2 - 3°dH (conductivity = 60 - 100 μS/cm).
If the water is not treated, the warranty is voided.
VS > 10 l/kW and < 40 l/kW
Total hardness / total
Conductivity
alkaline earths
[°dH] [mol/m³] C [μS/cm]
2 - 11.2 0.36 - 2.0 60 - 300
2 - 8.4 0.36 - 1.5 60 - 200
2 - 3 0.36 - 0.54 60 -100
2 - 3 0.36 - 0.54 60 -100
>= 10 l/kW, the next
S,specific
VS ≤ 40 l/kW
Total hardness / total Conductivity
alkaline earths
[°dH] [mol/m³] C [μS/cm]
2 - 3 0.36 - 0.54 60 -100
2 - 3 0.36 - 0.54 60 -100
2 - 3 0.36 - 0.54 60 -100
2 - 3 0.36 - 0.54 60 -100
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