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Operating information
Standard values for water quality
Only fill the heating system with treated water.
■
Occasions when this will be necessary:
–
Commissioning
–
Recommissioning
–
After repairs or system expansion
When filling with top-up water
–
Check filters, dirt traps and other blow-down or sepa-
■
rating facilities in the heating water circuit for depos-
its, clean and test their function:
Interval:
–
After commissioning and reinstallation: Frequently
–
Depending on the water treatment applied, e.g.
water softening: As required
Limescale deposits
Production
Limescale deposits shorten the service life of the
boiler. They form when the specified preventive meas-
ures have not been implemented correctly.
Flow temperatures
>
Operation with circulating water with low salt con-
tent
Note
Only use fill and top-up water with low salt content,
e.g. desalinated water, permeate or condensate.
For systems using mixed condensation:
As a rule, these systems automatically create water
with a low salt content if no boiler water is fed into the
system for alkalisation.
Boiler water properties
Salt content
Electrical conductivity at 25 °C
General properties
pH value
At 25 °C
■
In accordance with the Drinking Water Ordi-
■
nance/Drinking Water Treatment Ordinance
Oxygen (O
)
*1
2
Alkaline earths (Ca, Mg)
Phosphate
PO
■
4
In accordance with the Drinking Water Ordi-
■
nance/Drinking Water Treatment Ordinance
For Viessmann hot water boilers
■
Use of oxygen binders:
Sodium sulphite (Na
SO
2
3
Tab. 6
Lower values are possible in continuous operation.
*1
If using permissible inorganic corrosion inhibitors in the circulating water, oxygen concentrations up to 0.1 mg/l are possible
*2
If using other permissible products, follow the respective manufacturer's guidelines.
*3
12
All manuals and user guides at all-guides.com
(cont.)
100 °C (VdTÜV MB 1466)
μS/cm
mg/l
mmol/l
mg/l
mg/l
mg/l
)
*3
mg/l
Preventive action:
■
Observe VDI Guideline 2035
■
Observe the information in these instructions
Remedial measures:
Remove deposits immediately
■
Restore the operational functionality of the boiler
■
system
■
Check the boiler system for damage before recom-
missioning
■
Ensure that excessive limescale deposits (scaling)
cannot reoccur
Rectify incorrect operating parameters
■
Recommendation
Commission Viessmann Industrial Service (for contact
details see page 32) or another contractor to carry
out the relevant measures.
Operation with saline circulating water
Required properties for the fill and top-up water:
■
Low salt content
Free of alkaline earths and softened
■
Requirements
Low salt
10 to 30
30 to 100
>
Clear, free of sediment
9 - 10
9 - 10.5
9.5
9.5
≤
≤
< 0.1
< 0.05
< 0.02
< 0.02
< 5
< 10
7
7
≤
≤
< 2.5
< 5
–
–
Saline
100 to 1500
>
9 - 10.5
9.5
≤
< 0.02
*2
< 0.02
< 15
7
≤
< 15
< 10
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