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

Service

Cleaning the Combustion Chamber and Heating Surfaces

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
24
Vitocrossal 300 CU3A 26 to 199 Service
1. Remove burner assembly as per instruction on page 22.
2. Clean the combustion chamber by vacuuming loose
debris out.
3. Remove embedded sediment from the heat exchanger
surface by thoroughly rinsing with water or solvent
free cleaning agents such as citric acid based cleaners.
Avoid getting the refractory wet during cleaning.
Note: Discoloration of the heat exchanger surface is
the normal result of the combustion process.
It has no impact on the functionality or the
longevity of the heat exchanger.
4. Use a non-metallic brush if necessary, with a gentle
brushing motion to remove the embedded
sediment.
5. Flush the combustion chamber with water until it
runs clear through the condensate trap.
6. Remove and clean out any accumulated debris from
condensate trap. Reinstall condensate trap.
See page 25 for details.
7. Mount burner and tighten diagonally to a torque of
3 lb.ft. (4 Nm).
8. Fit gas supply pipe with new gasket.
Torque: 11 lb.ft (15 Nm).
9. Plug in air intake adaptor.
10. Connect the electrical cables/leads to the
corresponding components.
IMPORTANT
Perform gas leak test.
(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.