112
5790 733 - 07
Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Service
Rotary Damper and Servomotor
1. Pull the connector from the servomotor.
2. Undo 4 screws from the retaining bracket of the rotary
damper. Torque when installing: 13 lb.in (1.5 Nm).
Remove rotary damper together with the retaining
bracket.
3. Undo 2 screws on the servomotor axis.
Torque when installing: 3 lb.ft (4 Nm).
4. Remove the servomotor.
5. Release the articulated rod on the rotary damper
with an open-ended wrench.
6. Install new rotary damper, air pressure switch and
servomotor in reverse order.
7. For further steps, see chapter “Further assembly”
on page 117.
IMPORTANT
For CA3 models 3.5 to 6.0
An incompletely opened rotary damper can cause
malfunctions or indicate incorrect adjustment of the
servomotor. The rotary damper must be fully open when
the burner is off and during operation. If necessary,
adjust it via the articulated rod. See service instructions
for servomotor settings.
Ignition Cables
1. Pull the ignition cables from the ignition unit.
2. Pull the ignition connectors from the ignition electrodes.
3. Install new ignition cables in reverse order.
4. For further steps, see chapter “Further assembly”
on page 117.
Replacing the Solenoid Valve
1. Undo the hose clips and remove the hoses. Unscrew
2 plastic brackets from the 2/2 directional valve.
2. Unscrew 2 fixing screws and remove 2/2 directional valve.
Assemble in reverse order. Torque: 1.5 Nm
Screw the plastic brackets into the new 2/2 directional
valve. Fit the hoses and secure with hose clips (observe
the mark on the valve: 1 left, 2 right).
Note:
Only for boiler models 2.5 and 3.0.