Motorized Burner Inlet Damper; Inlet Damper Servomotor - Viessmann Vitocrossal 200 CM2 186 Service Instruction

Vitocrossal 200 CM2 186 to 311 Service

Motorized Burner Inlet Damper

Note: Only CM2 models 246 and 311 are equipped
with a motorized burner inlet damper.

Inlet Damper Servomotor

Note: Only CM2 models 246 and 311 are equipped
with a inlet damper servomotor.
1. Remove four screws from the venturi tube and remove
damper.
2. Remove the burner inlet damper from the burner along
with the servomotor and linkage.
3. Remove servomotor cover and set aside.
4. Disconnect the servomotor electrical connection from
the servomotor.
5. Disconnect the linkage from the servomotor shaft.
Remove bolts and servomotor and set aside.
6. Reinstall the servomotor, linkage and damper.
Note: Ensure the burner inlet damper vents are in the
fully open position when reconnected. Adjust
linkage if necessary.
CAUTION
If burner inlet damper is not opened completely it may
lead to malfunctions or indicates a wrong setup of the
servomotor.
7. Reinstall in reverse order.
Note: Torque the M6 (5 mm hex) screws to 35 lb.in (4 Nm).
Note: Torque the linkage parts to 13 lb.in (1.5 Nm).
1. Remove the two M4 (3 mm hex key) screws and
washers connecting the servomotor and set aside.
2. Loosen the M5 (4 mm hex key) set screw connecting
the linkage to the servomotor.
3. Remove the servomotor screw and cover and set aside.
4. Disconnect the servomotor electrical connection from
the servomotor.
5. Remove the servomotor and replace.
Note: Ensure the burner inlet damper vents are in the
fully open position when reconnected. Adjust
linkage if necessary.
CAUTION
If burner inlet damper is not opened completely it may
lead to malfunctions or indicates a wrong setup of the
servomotor.
6. Reinstall in reverse order.
Note: Torque the M4 (3 mm hex) screws to 8.8 lb.in (1 Nm).
Note: Torque the M5 (4 mm hex) set screw to 13.2 lb.in
(1.5 Nm).
Burner Service
37