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11.3 Cleaning the Boiler
The procedure for cleaning the boiler is
as follows:
1. Remove the nuts and washers
securing the front cleaning door
and withdraw the door. Take care -
it is heavy.
2. Remove the baffles as shown in
Figures 11-1 or 11-2.
3. Remove all deposits from the baffle
plates and all the boiler internal
surfaces using a stiff brush and
scraper if necessary.
4. Check the condition of the flue,
clean as necessary.
5. Check the condition of the front
cleaning door seal, replace if
necessary.
6. Replace the baffles, ensuring they
are correctly fitted. See Figures
11-1 or 11-2.
7. Pull out the spiral turbulators from
the heat exchanger tubes. See
Figure 11-3.
8. Clean the turbulators using a stiff
brush.
9. Test the heat exchanger
condensate drain by pouring
water into one of the lower tubes
and observe whether the water
discharges from the 22 mm
condensate outlet. Replace the
turbulators.
10. Replace the front cleaning door,
ensuring the seal is in good
condition and secure it in position
with the nuts and washers
previously removed.
Tighten to form a seal.
11. Remove the condensate trap
andcheck that it is not blocked and
is operating correctly, i.e. the float
is free to move. Clean the trap and
float as required. Refer to Section
6.8.
12. Check that the boiler condensate
outlet is unobstructed. Clean if
necessary.
11.4 Cleaning the Burner
The procedure is as follows:
1. Combustion head: Loosen the two
screws securing the combustion
head and withdraw the head.
2. Clean the combustion head.
3. Inspect the ignition electrodes:
Loosen the electrode clamp
screw and withdraw the electrode
assembly. Wipe clean and check
for any cracks in the ceramic
insulation.
Replace if necessary.
4. Nozzle: The nozzle should be
replaced on an annual service.
Check that the nozzle size and type
are correct, refer to table in Section
2.3 and boiler data label.
5. With the combustion head
removed, loosen the electrode
assembly clamp screw and slide
the electrodes away from the
nozzle.
6. Do not attempt to clean the nozzle.
7. Remove the nozzle using a good
fitting spanner (16 mm).
8. Always check the electrode
settings after replacing the nozzle,
see Figure 11-4.
Photocell - The photocell is a push-fit
in the burner body. Carefully pull it out
to clean.
Burner fan - With the air intake grille
or spigot removed, remove the screws
securing the fan housing cover (R/H
side of burner) and remove the cover.
Inspect the fan and housing and clean
as necessary. Replace the cover.
Pump filter - With the burner cover
removed, remove the four screws secur-
ing the pump end cover. Remove the
filter and wash in kerosene. Replace the
filter and end cover, ensure the ‘O’ ring
is in position.
Re-assemble in reverse order.
!
CAUTION
The use of an ill-fitting spanner will
damage the nozzle and could lead
to an incorrect flame pattern.
Figure 11-4: Electrode assembly
!
WARNING
To ensure safe and efficient
operation of the boiler it is important
that recommissioning is carried out,
especially combustion checks (CO2
level, flue gas temperature and
smoke number) after the boiler has
been serviced.
Refer to the Commissioning
instructions in Section 10.
!
NOTE
The condensate trap and
condensate outlet must be checked
on every service and cleaned as
necessary.
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