Viessmann 7810719 User manual

Please file in Service Binder
5624 562 - 03 10/2019
Part Number: 7810719, 7842945, 7870851 Ignition Electrode
Part Number: 7817324 Ionization Electrode
Part Number: 7810720 Gasket (ignition electrode)
For use with: Vitocrossal 200 CM2 186, 246 and 311
Installation Instructions
Ignition and Ionization Electrode Block
Refer to the Installation and Start-up/Service
Instructions applicable to this boiler.
Ensure that main power to the equipment being serviced
is off.
Ensure that the main fuel supply valve to the boiler
is closed.
Take precautions to avoid accidental activation of power
or fuel during service work.
Do not perform service work on any component part
without ensuring safe operation of the heating system.
When replacing parts, use original Viessmann or
Viessmann approved replacement parts.
Safety and Installation Requirements
Please ensure that these instructions are read and
understood before starting any service work. Failure
to comply with these instructions may cause product/
property damage, severe personal injury and/or loss
of life.
Working on the equipment
The installation, adjustment, service and maintenance of
this product must be performed by a licensed professional
heating contractor who is qualified and experienced in the
installation, service, and maintenance of hot water boilers.
There are no user serviceable parts on the boiler, burner or
control.
for use by heating contractor
Removing the Front Covers
Refer to the Installation and Service
Instructions applicable to this boiler.
1. Remove the M5 screw and set aside.
2. Pull top of upper front panel forward then lift and remove.
3. Reinstall front covers when finished in reverse order.
Note: Install side cover prior to installing the front covers.

Electrode Block Installation
5624 562 - 03
2
Removing the Side Cover
1. Remove the M6 screw (one per panel) on the top rail
and bottom support bracket. Then lift up and remove the
panel.
2. Reinstall the side cover when finished in reverse order.
Note: Install side cover prior to installing the front covers.
Refer to the Installation and Service
Instructions applicable to this boiler.
Ignition Electrode Block
IMPORTANT
If adjustment to the electrode is necessary, be careful not
to damage the ceramic sleeve of the electrode.
WARNING
Leak test the reconnected gas line.
1. Disconnect the ignition cables from the ignition electrodes.
2. Remove the two M6 (5 mm hex) screws and washers
from the ignition electrode block and set aside.
3. Remove the ignition electrode block from the burner door.
4. Remove the ignition electrode block gasket from the
burner door.
5. Remove the four M12 (19 mm or cin. hex)
burner door bolts and washers and set aside.
Note: To access the burner door, disconnect gas line
and plugs 40/156, 53 and 40 from the burner
control bracket and plugs 90 and 41 from the
burner control.
6. Reinstall the new ignition electrode block and gasket.
7. Open the burner door and check dimensions between
electrodes as well as electrode and burner as shown.
Carefully adjust if necessary.
8. Reinstall in reverse order.
9. Torque the M12 (19 mm hex socket cap screws)
ignition electrode 13 lb.ft (18 Nm).
10.Torque the M6 (5 mm hex) burner door bolts to
35 lb.in (4 Nm).

3
5624 562 - 03
Electrode Block Installation
Ionization Electrode Block
IMPORTANT
If adjustment to the electrode is necessary, be careful not
to damage the ceramic sleeve of the electrode.
WARNING
Leak test the reconnected gas line.
1. Disconnect the ionization cable from the electrode
terminal.
2. Remove the four M12 burner door bolts (19 mm or c
hex wrench) and washers and set aside.
Note: To access the burner door, disconnect gas line
and plugs 40/156, 53 and 40 from the burner
control bracket and plugs 90 and 41 from the
burner control.
3. Open the burner door.
4. Remove ionization electrode terminal nut (hex
7 mm). Remove serrated washer and O-ring.
5. Remove the inside portion of the ionization electrode.
6. Remove the two M6 screws (5 mm hex socket cap)
and washers from ionization electrode block and
discard it.
7. Remove the ionization electrode block and gasket from
burner door.
8. Reinstall in reverse order use only new parts supplied in
the kit.
9. Check the dimension between the electrode and
burner as shown. Carefully adjust if necessary.
10. Torque the M12 (19 mm hex) burner door bolts to
13 lb.ft (18 Nm).
11. Torque the M6 (5 mm hex socket cap screws)
ionization electrode 35 lb.in (4 Nm).

Technical information subject to change without notice. Printed on environmentally friendly
(recycled and recyclable) paper.
5624 562 - 03
Electrode Block Installation