Cleaning The Combustion Chamber And Heating Surfaces; Separating The Neutralizing System (If Installed) - Viessmann Vitocrossal 300 Service Manual

Vitocrossal 300 CU3A 26 to 57 Service

Cleaning the Combustion Chamber and Heating Surfaces

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.
Separating the Neutralizing System
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 19.
3. Use a vacuum cleaner to remove residues from heat
exchanger inside the combustion chambers.
Note: Be careful not to scratch parts which are in
contact with flue gas (use plastic brushes).
Follow Material Safety Data Sheet (MSDS) of
the cleaning agent manufacturer. The cleaning
agents must not contain hydrocarbon-based
solvents or potassium.
4. If necessary, clean the combustion chamber and
heat exchanger surface with a soft brush and/or rinse
with water.
Use solvent-free cleaning agents to remove heavy
residues:
- Remove deposits of combustion by-products with
alkaline agents containing detergents.
- Remove coatings and (yellowish brown) surface
discoloration with phosphoric acid-based "Antox
75 E Plus", or citric acid based CitriSurf 3050
by Stellar Solutions Inc.
- Rinse thoroughly with water.
- Clean condensate siphon (see page 22).
5. Mount burner and tighten diagonally to a torque of
3 lbf.ft. (4 Nm).
6. Fit gas supply pipe with new gasket.
Torque: 11 lbf.ft (15 Nm).
7. Plug in ventilation air adaptor.
8. Connect the electrical cables/leads to the
corresponding components.
(if installed)
Separating the neutralizing system (if installed) from the
boiler and connecting the drain hose
1. Separate the hose to the neutralizing system from
siphon A.
Service
21