Viessmann Vitocrossal CRU 800 Service Instructions For Contractors page 21

Cleaning the combustion chamber and heating...
For stubborn residues, surface stains or soot deposits,
cleaning agents can be used under the following con-
ditions:
■ Only use solvent-free cleaning agents. Ensure that
no cleaning agent gets between the boiler body and
the thermal insulation.
Remove soot deposits with an alkaline cleaning
■
agent with surfactant additive (e.g. Fauch 600).
■ Remove coatings and surface discolouration (yellow-
brown) with slightly acidic, chloride-free cleaning
agents based on phosphoric acid (e.g. Antox 75 E).
■ Remove loose deposits from the boiler; thoroughly
flush the heating surfaces and the flue gas collector
with a water jet.
Commissioning, inspection, maintenance
(cont.)
Cleaning agent manufacturer's instructions
Recommendation:
"Fauch 600" and "Antox 75 E"
Manufacturer:
Hebro Chemie GmbH
Rostocker Strasse 40
D-41199 Mönchengladbach
21