Wolf CGB-75 - Technical Information for Water Treatment

433062555_201804
26.Technicalinformationforwatertreatment
The system must be thoroughly cleaned / ushed before
commissioningandasludgelter/dirttrap(<5μm)e.g.Wolf
accessory installed in the return line. This must be in close
proximity to the boiler.
Thellandtop-upwatermustonlybetreatedwithadesalina-
tion process. The “Water treatment diagram” and the "Maxi-
mum 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con-
ductivityof≈60μS/cm.Themax.permissibletotalhardness
andthecorrespondingmax.conductivityaresystem-specic
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 with asso-
ciated water leaks may occur.
We recommend regular emptying of the sludge lter and
keeping of a system log.
Permissible methods:
- Desalination using mixed-bed cartridges. These are multi
stage ion exchangers. We recommend, for example, using
e.g.GrünbeckorJudocartridgesfortherstll,andlater
as and when required.
- Desalination via reverse osmosis
- Topping up with distilled water
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 supply utility. This
mustverifythatthetotalhardnessissufcientlylow.
For a specic system volume V
A,specic
 >= 10l/kW the next
smaller limit must be used, for V
A,specic
>=20l/kWthenext-
but-one limit and for V
A,specic
>= 40l/kW the smallest value
from the following table must be used.
Foraspecicsystemvolumeof>50l/kW,adjustthetotalhard-
nessto2-3°dHusingadesalinationprocess.Thiscorresponds
toconductivityof60-100μS/cm.
If the boiler is integrated in the system without a low loss
header,adjustthetotalhardnessto2-3°dH(Conductivity=
60-100μS/cm).
2
6
10
14
18
600
800
200
400
1000
1600
1200
1400
1800
2000
CGB-75
CGB-100
Water treatment
required
No water treatment
required
System volume in l
Totalhardnessin°dH
Figure: Water treatment
LimitsinrelationtothespecicsystemvolumeVA
(VA=Systemvolume/maximumratedheatingpower
1)
)
Totalhardnessconversion:1mol/m³=5.6°dH=10°fH
Total
heating
output
V
A
≤20l/kW V
A
>20l/kWand<50l/kW V
A
≥50l/kW
Total hardness/
total alkaline earths
Conductivity
2)
at 25°C
Total hardness/
total alkaline earths
Conductivity
2)
at 25°C
Total hardness/
total alkaline earths
Conductivity
2)
at 25°C
[kW] [°dH] [mol/m³] C [µS/cm] [°dH] [mol/m³] C [µS/cm] [°dH] [mol/m³] C [µS/cm]
1 ≤50 ≤16.8 ≤3.0 <800 ≤11.2 ≤2 <800 ≤0.11
3)
≤0.02 <800
2 50-200 ≤11.2 ≤2
<100
≤8.4 ≤1.5
<100
≤0.11
3)
≤0.02
<1003 200-600 ≤8.4 ≤1.5 ≤0.11
3)
≤0.02 ≤0.11
3)
≤0.02
4 ≤600 ≤0.11
3)
≤0.02 ≤0.11
3)
≤0.02 ≤0.11
3)
≤0.02
Thetotalamountofllandtop-upwateroverthelifecycleoftheboilermustnotexceedthreetimesthenominalvolumeofthe
heating system.
1)
In systems with multiple boilers, the max. rated heating output of the smallest boiler must be used in accordance with VDI 2035
2)
 Highsalinity<800µS/cm
 Lowsalinity<100µS/cm
3)
 <0.11°dHrecommendedstandard;permissibleuptolimitof<1°dH
Table 1
GradualincreaseinthedemandforthespecicSystemvolume(V
S
=systemvolume/lowestindividualoutput)andtotalheat-
ing output.
Thetotalamountofll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.
Heatingwaterqualityrequirementrelatingtotheentireheatingsystem