Viessmann VITODENS 200-W Service Instructions Manual page 23

Further details regarding the individual steps
A
Commissioning, inspection, maintenance
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 (e.g. Antox 75 E)
onto the heat exchanger A and let
the solution soak in for approx. 20
min.
3. Thoroughly flush the heat
exchanger A with water.
4. Install the burner and torque screws
diagonally with 12 Nm.
5. Fit the gas supply pipe with a new
gasket. Torque fittings with 10 Nm.
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.
(cont.)
23