Viessmann VITOCELL 140-E Installation And Service Instructions Manual page 39

Filling the heating water buffer cylinder
Total permissible hardness of the fill and top-up water according to VDI 2035
Total heating output
of heat generator
50 kW
≤
> 50 to 200 kW
≤
> 200 to 600 kW
≤
> 600 kW
Further requirements for the fill and top-up water
independent of the heating output according to
VDI 2035
Appearance
Clear, free of sedimented substances
Electrical conductivity
If the conductivity of the heating water is above
1500 µS/cm due to a high salt content (e.g. in supply
areas near the coast), desalination is necessary.
pH value
Materials in the system
Without aluminium alloys
With aluminium alloys
Information about system design
■ For softening the heating water, use softening sys-
tems with water flow meters: See Vitoset pricelist.
■ During installation, ensure that individual pipework
sections can be drained separately. This avoids the
need to drain all the heating water in the case of
maintenance and repair work.
As the formation of sludge and magnetite in the heat-
■
ing water cannot generally be completely prevented
during operation, we recommend the installation of
suitable magnetic dirt separators: See Vitoset pricel-
ist.
*1 In the case of systems with several heat generators that have several different specific water capacities, the smallest spe-
cific water capacity is definitive.
To calculate the specific system volume, the smallest individual heating output should be used for systems with several
*2
heat generators.
Specific water capacity of
heat generator *1
0.3 l/kW
≥
< 0.3 l/kW
—
—
—
pH value
8.2 to 10.0
8.2 to 9.0
Commissioning, inspection, maintenance
(cont.)
Specific system volume
20 l/kW > 20 to
≤
None
≤
3
3.0 mol/m
≤ ≤
(16.8 °dH)
3
2.0 mol/m
≤ ≤
(11.2 °dH)
3
1.5 mol/m 0.05 mol/m
≤ ≤
(8.4 °dH)
3
0.05 mol/m 0.05 mol/m
≤ ≤
(0.3 °dH)
Notes on commissioning and operating the system
In order to prevent corrosion by remaining flushing
■
water, fill the system completely immediately after
flushing.
■ Even treated fill water contains oxygen and small
amounts of foreign matter. In order to prevent local
concentrations of corrosion products and other
deposits on the heating surfaces of the heat genera-
tor, commission the system in stages with a high
heating water flow rate. Start with the heat generator
at its lowest output. For the same reason, in the case
of multi boiler systems and cascades, commission all
heat generators at the same time.
■ If extending the system or conducting maintenance
or repair work, only drain the pipework sections
where absolutely necessary.
Check and clean filters, dirt traps and other blow-
■
down or separating facilities in the heating water cir-
cuit after filling and commissioning.
■ Special regional regulations regarding fill and top-up
water must be observed. When disposing of heating
water containing additives, check whether additional
treatment may be required before it is discharged
into the public waste water system.
*2
40 l/kW > 40 l/kW
≤
3.0 mol/m 3 0.05 mol/m
≤
(16.8 °dH) (0.3 °dH)
3
1.5 mol/m 0.05 mol/m
≤
(8.4 °dH) (0.3 °dH)
3
1.0 mol/m 0.05 mol/m
≤
(5.6 °dH) (0.3 °dH)
3
0.05 mol/m
≤
(0.3 °dH) (0.3 °dH)
3
0.05 mol/m
≤
(0.3 °dH) (0.3 °dH)
3
3
3
3
3
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