Viessmann Vitocrossal 300 Service Instructions Manual page 15

Checking the boiler door/burner gaskets and...
A
C
E
Ø = Ø B -10
Fig. 5
Boiler door
A
Flame tube
B
Thermal insulation mat
C
Check the thermal insulation mat at the flame tube.
The blue side of the thermal insulation mat has to face
the combustion chamber. It must be in close contact
with the flame tube.
B
D
D
E
Commissioning, inspection, maintenance
(cont.)
Burner plate
Thermal insulation block
15