Viessmann Vitotwin 300-W Installation And Service Instructions For Contractors page 76

Commissioning, inspection, maintenance
Further details regarding the individual steps
03. Use a vacuum cleaner to remove
residues from heating surface B
inside the combustion chamber.
04. If required, spray slightly acidic,
chloride-free cleaning agents based
on phosphoric acid onto heating
surface B and let the solution soak
in for at least 20 min.
05. Thoroughly flush heating surface
B with water.
06. Reopen the opening in heating sur-
face B.
07. Reinstall separating plate A and
tighten screws with 1.5 Nm.
Note
Ensure the separating plate is fitted
correctly.
76
(cont.)
08. Install the burner and tighten the
screws diagonally with 8.5 Nm.
09. Fit the gas/air duct with a new gas-
ket. Tighten the union nut with a tor-
que of 100 Nm.
10. Check the gas connections for tight-
ness.
Danger
Escaping gas leads to a risk
of explosion.
Check all fittings for gas
tightness.
11. Connect the electrical cables/leads
to the corresponding components.