Viessmann Vitocrossal 200 CM2 500 Service Instructions Manual page 45

Vitocrossal 200, CM2 400, 500 and 620 Service
Burner Door
(continued)
7. Disconnect electrical plugs 100 and 100A from
the fan. Disconnect pressure switch tubes APS1
from the venturi and APS2 from the burner door.
Remove the four M8 (13 mm hex) nuts connecting
the fan to the burner door and set aside. Remove
fan/venturi assembly (see page 42 for additional
information).
8. Remove two M6 (5 mm hex key) screws, washers
and ground wire from the burner control bracket and
set aside. Remove the burner control bracket
assembly.
9. Remove pressure switch barb fitting from burner door
and set aside.
Note: Replace barb fitting washer as required.
10.Remove burner tube (see page 42).
11.Install new burner door.
Note: Install burner door studs to new door for
connection to fan/venturi assembly.
Note: When installing the fan/venturi assembly to the
burner door torque nuts to 53 lb.in (6 Nm).
Torque M12 (19 mm hex) door bolts to 13 lb.ft
(18Nm).
Torque the M8 (13 mm hex) nuts to 53 lb.in (6 Nm).
WARNING
Leak test the reconnected gas line.
12. Reinstall in reverse order.
Burner Service
45