Viessmann Vitodens 100-W Installation And Service Instructions Manual page 27

Further details regarding the individual steps
A
Commissioning, inspection, maintenance
(cont.)
1. Use a vacuum cleaner to remove res-
idues from the heat exchanger A
inside the combustion chamber.
2. If required, spray slightly acidic,
chloride-free cleaning agents based
on phosphoric acid onto heat
exchanger A and let the solution
soak in for approx. 20 min.
3. Thoroughly flush the heat
exchanger A with water.
27