Viessmann Vitomax LW M148 Series, Operating And Service Instructions

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■ 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.
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.
Flow temperatures
>
100 °C (VdTÜV MB 1466)
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.
Operation with saline circulating water
Required properties for the fill and top-up water:
■ Low salt content
■ Free of alkaline earths and softened
Boiler water properties Requirements
Salt content Low salt Saline
Electrical conductivity at 25 °C μS/cm 10 to 30
>
30 to 100
>
100 to 1500
General properties Clear, free of sediment
pH value
■
At 25 °C
■
In accordance with the Drinking Water Ordi-
nance/Drinking Water Treatment Ordinance
9 - 10 9 - 10.5 9 - 10.5
≤
9.5
≤
9.5
≤
9.5
Oxygen (O
2
)
*1
mg/l < 0.1 < 0.05 < 0.02
*2
Alkaline earths (Ca, Mg) mmol/l < 0.02 < 0.02 < 0.02
Phosphate
■
PO
4
mg/l
< 5 < 10 < 15
■
In accordance with the Drinking Water Ordi-
nance/Drinking Water Treatment Ordinance mg/l
≤
7
≤
7
≤
7
■
For Viessmann hot water boilers mg/l < 2.5 < 5 < 15
Use of oxygen binders:
Sodium sulphite (Na
2
SO
3
) *3 mg/l
– –
< 10
Tab. 6
*1 Lower values are possible in continuous operation.
*2 If using permissible inorganic corrosion inhibitors in the circulating water, oxygen concentrations up to 0.1 mg/l are possible
*3 If using other permissible products, follow the respective manufacturer's guidelines.
Operating information
Standard values for water quality
(cont.)
5673144
Operation