Burner Door - Viessmann Vitocrossal 200 CM2 400 Service Instructions Manual

Vitocrossal 200, CM2 400, 500, 620 and 620 TX Service

Burner Door

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 37 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.
1. Loosen the retaining clamp and disconnect the
combustion air flex hose and set aside.
2. Disconnect the gas line.
3. Disconnect electrical plugs 35, 36, 87, 111 and 122
from the burner control.
Note: To disconnect electrical plugs 87 and 111 remove
the burner control cover (see page 34).
4. Remove ionization electrode block.
5. Remove ignition electrode block.
6. Remove the six M12 (19 mm hex) burner door bolts,
washers and cotter pin and set aside.
Note: To access the burner door, disconnect gas line
and plugs 40/156 and 40 from the burner
control bracket and plugs 90 and 41 from the
burner control.
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 40).
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
43