23
221954D
100 FF ONLY
Remove the baffles, see diagram 10.3.
If a vertical or flue bend systems, using corrugated bends, see
Flue Kit Installations, has been fitted then the TOP FLUE
BAFFLES will have been REMOVED.
NOTE:
When replacing the bottom three baffles, the two half
and one whole baffle, make sure that they are positioned with
the mark “100” to front of appliance as shown in diagram 10.3.
120 FF ONLY
Remove the baffles, see diagram 10.4.
NOTE:
When replacing the bottom baffle, make sure that it is
positioned with the word “Bottom” to front of appliance as shown
in diagram 10.4.
Continued-
The heat exchanger can now be cleaned, paying particular
attention to the gap between the fins, with a suitably sized semi-
stiff brush, using the cleaning plate, as shown in diagram 10.5,
to protect the rear insulation panel.
Remove the paper together with any debris.
10.3 Main Injector
With the main burner removed the main injector can be inspected
and cleaned as necessary, see diagram 10.6.
If removing for cleaning do not use a wire or sharp instrument
on the hole.
Use a little suitable sealant on the external thread when refitting
to make sure a gas tight seal is made.
NOTE:
On refitting and after cleaning the heat exchanger make
sure the burner is fitted correctly, that is, located on the main
injector and horizontal.
10.4 Electrode, Pilot Burner and Pilot Injector
Clean the pilot burner and electrode.
100FF Model Only. To remove the electrode release the spring
clip, see diagram 10.7.
120FF Model Only. To remove the electrode remove the
securing screw, see diagram 10.7.
When removing and replacing the pilot injector from the pilot
burner take care not to damage the electrode, see diagram 8.6,
clean the injector by blowing through it.
Check that the spark gap is as shown in diagram 8.3.
10.5 Operational Checks
After completing a service and before fitting the case, check
condition of the case seal and renew if necessary.
Examine the flue hood and terminal to make sure they are clean
and clear of obstructions.
Light the boiler and carry out the functional checks as described
in Section 8.
Testing Flue Gases:
If any doubt exists that the flue products
are not exhausting correctly, investigate by use of a gas
analyser (FGA).
Diagram 10.2
Diagram 10.4
SECURING
SCREW
BURNER
SUPPORT BRACKET
BAFFLE (4)
HEAT
EXCHANGER
4296
9642
10 Servicing
120FF only
Diagram 10.3
BAFFLE (6)
HEAT
EXCHANGER
9642
100FF only