Check And Adjust Ignition And Ionization Electrodes; Clean Combustion Chamber/Heat Exchanger Surface - Viessmann VITODENS 200-W Service Instructions Manual

Start-up and Service

Check and Adjust Ignition and Ionization Electrodes

Clean Combustion Chamber/Heat Exchanger Surface

WARNING
Follow cleaning agent manufacturer's safety instructions
and wear appropriate protective equipment.
WARNING
Never use a metal wire brush or mechanically driven
brushes.
22
Vitodens 200-W B2HA 19, 28, 35 Service
1. Check the ignition electrodes A and ionization
electrode B for wear and contamination.
2. Clean electrodes with small brush (not a wire brush)
or emery paper.
3. Check electrode gaps. If the gaps are not as specified,
or the electrodes are damaged, replace and align the
electrodes with new gaskets. Tighten the electrode
fixing screws to a torque of 40 lb.in. (4.5 Nm)
using a calibrated torque wrench.
1. Remove front enclosure panel (if still installed) as
per the instructions on page 12 in this manual, and
reinstall panel upon completion of service work.
2. Remove burner assembly as per instruction on page 20.
Note: Be careful not to scratch parts which are in
contact with flue gas. Use plastic brushes, not
wire brushes!
Follow Material Safety Data Sheet (MSDS) of
the cleaning agent manufacturer.
The cleaning agents must not contain
hydrocarbon-based solvents or potassium.
3. Use a vacuum cleaner to remove residues from heat
exchanger A inside the combustion chamber.
4. If necessary, clean the combustion chamber and
heat exchanger surface A with a soft brush and/or
rinse with water.
Use solvent-free cleaning agents to remove residues:
- Remove coatings and (yellowish brown) surface
discoloration with phosphoric acid-based "Antox
75 E Plus", or citric acid-based CitriSurf 3050 or
CitriSurf 77 by Stellar Solutions Inc.
- Rinse thoroughly with water.
5. Avoid getting the refractory wet during cleaning.
6. Install burner assembly.
7. Mount burner (six screws) and tighten diagonally
to a torque of 6.3 lb.ft. (8.5 Nm).
8. Fasten threaded connection for the gas connection
hose with a new gasket or O-ring and torque to
6.3 lb.ft. (8.5 Nm).
9. Connect electrical cables to corresponding parts.
IMPORTANT
Perform gas leak test.