49
1.
Undo 2 screws and remove fan
A
.
2.
Remove back draught safety device
B
.
3.
Check the damper and gasket for dirt and damage.
Replace if necessary.
4.
Refit back draught safety device
B
.
Note
Observe correct installation position.
5.
Refit fan
A
and secure with 2 screws.
Tighten screws as tightly as necessary and ensure
that the components are undamaged and are func-
tioning correctly throughout service life.
Observe torque settings if a torque wrench is avail-
able.
Torque: 4.0 Nm
Back draught safety device in the flue gas connec-
tion
A
Fig. 34
1.
Remove the balanced flue system.
Note
If the balanced flue system cannot be removed,
clean and check the back draught safety device via
the inspection cover.
2.
Check back draught safety device
A
for dirt, ease
of movement and function.
3.
Refit the balanced flue system.
4.
Pour a small amount of water through the inspec-
tion port to ensure the back draught safety device
is working.
Cleaning the heating surfaces
!
Please note
Scratches to the surfaces of the heat exchanger
that come into contact with hot gas can result in
corrosion damage. Brushing can cause deposits
to become lodged in the gaps between the coils.
Never use brushes to clean the heating sur-
faces.
!
Please note
Prevent damage due to cleaning water.
Cover electronic components with suitable
watertight material.
Note
Discolouration on the heat exchanger surface is a nor-
mal sign of use. It has no bearing on the function and
service life of the heat exchanger.
The use of chemical cleaning agents is not required.
A
Fig. 35
1.
Use a vacuum cleaner to remove combustion resi-
dues from heating surface
A
of the heat
exchanger.
2.
Flush heating surface
A
with water.
Commissioning, inspection, maintenance
Checking the back draught safety devices
(cont.)
6167586