Wolf CGB-2-24 - Filling and Draining the System; Heating Water Treatment and Filling

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25.Fillingtheheatingsystem/trap
Beforecommissioning,carryoutaleaktestonallhydraulicpipework
Iftheapplianceisnotwatertight,thereisariskofleaksandresulting
materialdamage.
Testpressureontheheatingwatersidemax.4bar
Priortotesting,closetheshut-offvalvesintheheatingcircuitforthe
appliance,asotherwise,thesafetyvalve(accessory)opensat3bar.
Theappliancehasalreadybeenleaktestedatthefactoryat4.5bar.
TreatmentofheatingwaterinaccordancewithVDI2035:
Potablewatermaybeusedasllingandtop-upwaterifthelimitsintable1arenot
exceeded. Otherwise, the water must be treated using a desalinisation process.
If the water quality does not meet the required values, the warranty for components
on the water side becomes void.
Theonlypermissiblewatertreatmentprocessisdesalinisation!
Thoroughlyushthesystempriortocommissioning.Inordertokeepoxygenation
aslowaspossible,itisrecommendedtoushthesystemusingtapwaterandthen
tousethiswaterforthewatertreatment(positionthedirtlterupstreamoftheion
exchanger).
Heatingwateradditivessuchasantifreezeorinhibitorsarenot
permitted,astheycandamagetheheatingwaterheatexchanger.
Alkalisingadditivesmaybeusedbyawatertreatmentspecialistto
stabilisethepHvalue.
In order to prevent corrosion damage to the aluminium heating water heat exchanger,
the pH value of the heating water must be between 6.5 and 9.0.
Inmixedinstallations,apHvalueof8.2to9.0mustbemaintainedin
accordancewithVDI2035.
The pH value should be checked again 8-12 weeks after commissioning, as under
certain circumstances, chemical reactions may cause it to change. If it does not fall
within this range after 8-12 weeks, remedial measures must be taken.
Heating water quality requirement relating to the entire heating system
LimitsinrelationtospecicsystemvolumeVA
(VA=systemvolume/max.ratedheatingoutput
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
Conduc-
tivity
2)
at 25°C
Total hardness / total
alkaline earths
Conduc-
tivity
2)
at 25°C
Total hardness /
total alkaline earths
Conduc-
tivity
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)
According to VDI 2035, in systems with multiple boilers, use the maximum rated heating output of the smallest heat source
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
Hydraulics
Please
note
Filling
Please
note
Please
note
Filling
Please
note
Electricalconductivityandwater
hardness