Frost Protection; Connection On The Flue Gas Side; Chimney - Viessmann VITOLIGNO 200-S Technical Manual

Design information
When engineering the system, observe the following:
■ Install shut-off valves in the different sections. This prevents the
need for draining all the heating water in the case of repairs or sys-
tem expansion.
■ Install a water meter to record the amount of the fill and top-up water.
Enter the volume of fill water and the water hardness into the boiler
service instructions.
■ For systems with a specific system volume in excess of 20 l/kW out-
put (for multi boiler systems, apply the output of the smallest boiler),
apply the requirements of the next highest category of total output
(in accordance with the table). In the case of severe excess (> 50 l/
kW), soften the water down to a total of alkaline earths of
≤ 0.02 mol/m 3 .
Operating information:
■ Commission the system step by step, starting with the lowest boiler
output and a high heating water flow rate. This prevents a localised
concentration of limescale deposits on the boiler heating surfaces.
■ In multi boiler systems, start all boilers simultaneously to prevent the
entire limescale deposit settling in the heat transfer area of just one
boiler.

6.5 Frost protection

An antifreeze additive suitable for heating systems can be added to
the fill water. The antifreeze manufacturer must verify its suitability,
since otherwise damage to gaskets and diaphragms can occur as well
as noise during heating operation. Viessmann accepts no liability for
any resulting damage or consequential losses.

6.6 Connection on the flue gas side

Chimney

A chimney compliant with regulations relevant to the rated boiler heat-
ing output is required for efficient boiler operation.
Note that in its lower heating output range, the Vitoligno 200-S can
create low flue gas temperatures (risk of the air temperature dropping
below the dew point). Therefore, connect this combustion equipment
to highly insulated chimney stacks (thermal resistance class I to DIN
18160 pt.1) or use suitable moisture-resistant flue systems, which
have Building Regulation approval. The chimney must have a smooth
inner surface with no cracks and no narrowings of the cross-section.
Specification:
Rated heating output
Required draught
Minimum chimney height
*8
Minimum cross-section
Ventilation aperture of the boiler room at least
CO content
2
*8 To DIN 4759.
Alternative cross-sections possible with calculation.
*9
VITOLIGNO 200-S
(cont.)
kW
mbar
m
Ø mm
cm 2
% by vol.
■ During expansion or repair work, only drain the necessary sections.
■ Where water treatment is required, treat even the first fill of the heat-
ing system prior to commissioning. This also applies to any subse-
quent filling, e.g. after repairs or after system expansion, and for all
amounts of top-up water.
■ Check, clean and activate filters, dirt traps and other blow-down or
separating facilities in the heating water circuit more frequently after
commissioning or new installations; later on do so subject to require-
ments in line with the water treatment applied (e.g. water softening).
The build-up of limescale deposits on the heating surfaces will be
minimised if these instructions are observed.
If limescale deposits have formed because of a failure to observe the
requirements of directive VDI 2035 the service life of the installed
heating appliances will in most cases already have been reduced.
Removing the limescale deposits is one option for restoring opera-
tional viability. This must be carried out by Viessmann Industrieservice
or a specialist company. Inspect the heating system for possible dam-
age prior to returning it into use. It is essential that the faulty operating
parameters are corrected to prevent renewed formation of excessive
scale deposits.
The installation of a secondary air device (draught limiter) is recom-
mended for chimneys with draughts in excess of 0.15 mbar.
20 and 30
0.08
6
*9
180
150
14
40 and 50
0.08
7
*9
180
150
14
VIESMANN
6
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