Viessmann CU3, Service Instructions Manual

Page: 19 / 56

19
Initial start−up, inspection and maintenance
Further details regarding the individual steps
(cont.)
Cleaning the combustion chamber and heating surfaces
¨
Do not use a wire brush or sharp objects.
Avoid scratches or other damage to components which are in contact with
flue gases.
Components which are in contact with flue gases should not come into
contact with pure iron, otherwise corrosion damage will result. Use plastic
brushes, if required.
1. Clean the combustion chamber
and heating surfaces.
H
For normal cleaning, thoroughly
flush with a water jet.
H
However, you may use cleaning
agents if you notice stubborn
residues, surface discolouration
or soot deposits.
When doing so, please observe
the following:
Only use solvent−free cleaning
agents. Ensure that no solvent
enters between the boiler body
and the thermal insulation.
Remove soot deposits with
alkaline agents containing
surfactants (e.g. Fauch600
*1
).
¨
Safety instructions
Observe the cleaning agent
manufacturer’s details. Wear
goggles, protective gloves and
protective clothing if
necessary.
Combustion residues may
create thin, yellow brown
surface discolouration as well
as hard deposits, which may
only become visible after
removing the soot deposits.
Use slightly acidic, chlorine−
free cleaning agents based on
phosphoric acid to remove
surface discolouration and
hard deposits (e.g.
Antox75E
*1
).
2. Remove loosened deposits from
the boiler, the heating surfaces
and the flue gas collector and
thoroughly rinse with water.
*1
Manufacturer: Hebro Chemie GmbH
Rostocker Straße40
D41199 Mönchengladbach
5692500GB