Viessmann VITOMAX 200-HS Operating And Service Instructions page 29

Water quality for steam boiler systems
■ Top-up water downstream of the top-
up water treatment system or the stor-
age tanks
■ Condensate at the condensate tank
outlet, if installed; otherwise draw the
sample off as near to the feedwater
tank as possible
Analysis
General information
Verify compliance with the values speci-
fied in table 1 (page 22) and table 2
(page 23) through analyses.
If the analyses are carried out in accord-
ance with different standards or by indi-
rect means, calibrate such methods. A
clean surface with water supply and
drainage facility should be made availa-
ble for carrying out the analyses. The
required equipment should also be kept
in a cupboard at the workplace.
Note
For some types of water, the amount of
solute matter can be estimated by
means of the conductivity. In addition
there is a correlation between the pH
value and both conductivities.
Viessmann offers components for water
analysis to aid continual monitoring of
the O and pH values as well as water
2
hardness levels.
*5 There is currently no European or international standard; see for example
DIN 38405-21 standardised German procedure for water, waste water and sludge
examination; anions (group D); photometric determination of solute silicic acid (D
21).
*6 As an alternative, the permanganate index can be checked in accordance with
ISO 8467, if these values are specified.
(cont.)
Analysis procedure/test equipment
In continuous boiler operation, the boiler
values can be checked adequately with
the test equipment. In the case of severe
deviations, confirm the actual values
through correspondingly standardised
analysis procedures to help remedy the
problem.
Parameters must be checked in accord-
ance with the following standards:
Acid capacity
Conductivity
Copper
Iron
Oxygen
pH value
Phosphate
Potassium
*5
Silicic acid
Sodium
TOC *6
Total hardness as
Ca + Mg
Water quality
EN ISO 9963-1
ISO 7888
ISO 8288
ISO 6332
ISO 5814
ISO 10523
ISO 6878–1
ISO 9964–2
ISO 9964–1
ISO 8245
ISO 6059
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