Viessmann FB2B Installation And Service Instructions Manual page 41

Further details regarding the individual steps
A
1. Use a vacuum cleaner to remove
deposits from 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.
Commissioning, inspection, maintenance
(cont.)
3. Thoroughly flush heat exchanger A
with water.
4. Install the burner. Fit the screw with a
serrated washer as well as the
remaining screws, then apply torque
diagonally with 8.5 Nm.
5. Fit the gas supply pipe with a new
gasket.
6. Check the gas connections for tight-
ness.
Danger
Escaping gas leads to a risk of
explosion.
Check all fittings for gas tight-
ness.
7. Connect the electrical cables/leads to
each corresponding component.
41