Cleaning The Heat Exchanger And Fitting The Burner; Parts - Viessmann VITODENS 222-F Service Instructions Manual

Service

Cleaning the Heat Exchanger and Fitting the Burner

22
Vitodens 222-F B2TA 19 and 35 Service
1. Remove front enclosure panel (if still installed) as
per the instructions on page 11 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 deposits of combustion by-products with
alkaline agents containing tenside.
- Remove coatings and (yellowish brown) surface
discoloration with phosphoric acid-based "Antox
75 E Plus", or citric acid-based CitriSurft 3050
by Stellar Solutions Inc.
- Rinse thoroughly with water.
- Clean siphon (see page 23).
5. Install burner assembly.
6. Mount burner (four torx screws) and tighten
diagonally to a torque of 75 lb.in. (8.5 Nm).
7. 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).
8. Connect electrical cables to corresponding parts.
IMPORTANT
Perform gas leak test.
WARNING
Follow cleaning agent manufacturer's safety instructions
and wear appropriate protective equipment.
WARNING
Never use a metal wire brush or mechanically driven
brushes.