Viessmann VITOCROSSAL CRU 800 kW Service Instructions Manual page 27

Closing the burner door
2. Tighten the burner door screws diagonally to a tor-
que of 40 Nm.
Danger
Leaks from the burner door can result in poi-
soning through escaping gas.
Check the burner door for flue gas tightness,
e.g. with inspection mirror, gas sensor or
thermal image camera.
In the case of leaks, tighten diagonally to 50 Nm.
3.
1.
2.
Fig. 19
Attach the intake extension.
Commissioning, inspection, maintenance
(cont.)
3. Check flue gas tightness again.
27