Worcester 12/14 Installation And Servicing Instructions page 24

(c) Clean both sides of the fan impeller and remove any debris
from the burner housing.
(d) Check that the impeller rotates freely.
(e) Clean the air inlet passage and check that the adjustment
mechanism operates freely.
(f) Re-assemble the components.
Electro Oil Inter B11
(a) Remove the acoustic fan inlet cover.
(b) Remove the three screws holding the fan cowl in position and
remove the cowl noting how the fan control flap is positioned.
(c) Check that the air control flap pivots freely and ensure the air
path to the burner head is clear.
(d) Clean both sides of the fan impeller and remove any debris
from the burner housing.
(e) Check that the impeller rotates freely.
Fig. 24. Mechanical Shut-off Valve
Check Valve
Re-assemble the components.
3. Remove the combustion head and thoroughly clean all deposits.
4. Inspection of Mechanical Shut-off Valve.
(a) Remove the nozzle.
(b) Fasten an M5 screw, with a minimum length of 30mm, into
the threaded hole (A) and pull the screw to withdraw the check
valve.
(c) Check that the nozzle holder is clear of any debris and clean if
necessary.
(d) Check that the three holes in the check valve are clear of any
debris. Discard the check valve if the holes cannot be cleared or
if the unit is defective and replace with a new one.
(e) Replace in the reverse order.
5. It is strongly recommended that the oil atomising nozzle is
replaced at each service. If this is not possible then remove and
clean the integral filter, but under no circumstances should the
nozzle be stripped into its component parts and never attempt
to clean the nozzle tip.
6. Check and reset the electrodes, where necessary, as shown in
Figs. 20, 21 and 22.
7. Replace the combustion head and check that the nozzle lies
central to the combustion head and the head settings are as
shown in Figs. 20, 21 and 22.
8. Withdraw the photocell from its housing and clean.
9. Remove and clean the oil pump internal filter using kerosene
or white spirit. The internal filter is accessed by removing the oil
pump cover on the Danfoss BFP 11 and Suntec AS47C and by
unscrewing and withdrawing the cartridge on the Danfoss BFP
41 as indicated in Fig. 9
10. It is recommended that the standard flexible oil line is
replaced at each yearly service to prevent the possibility of a
leak due to ageing.
11. Re-assemble the burner components.
12. Check the sponge O-ring seal located around the combus-
tion head and replace if necessary. It is imperative that this seal
is in good condition since failure will cause the flue gases to be
re-circulated into the burner inlet, or the room in the case of a
CF/LLD appliance.
14.4 Remove the paper element from the external oil filter and
replace. If the filter contains a washable element then thoroughly
Nozzle Assembly
A
clean in Kerosene or white spirit and re-assemble into the filter.
14.5 Clean the air ducts. (RS balanced flue model only).
1. Remove the rear duct top cover
2. Shine a light down the rear duct and inspect both the rear and
under duct for any sign of debris and clean where necessary using
a flexible hose connected to a vacuum cleaner. A short length of
garden hose would be suitable for this purpose.
3. Replace the rear duct top cover.
4. Check that the oil bleed holes are clear. These are located in the
base of the burner cover box and the bottom front face of the
burner housing.
14.6 Clean the Boiler.
1. Remove the boiler top access door by releasing the two M10
nuts and check the fibreglass rope seal. Replace the seal if
necessary.
2. Remove and check the baffle retainer where fitted (20-25 model
only). (See Fig. 23c).
3. Remove the baffles and clean and check their condition.
Replace any baffles considered to be badly corroded.
4. Thoroughly clean all of the heat exchanger surfaces using a stiff
wire brush and vacuum clean all loose debris from the combustion
chamber. Take care not to damage the base installation.
5. Remove and check the heat shield where fitted (20-25 model
only). (See Fig. 23c).
6. Check the combustion chamber base insulation board and
replace if there is any sign of damage.
7. Check and clean the flue system if necessary.
8. Replace the items in reverse order noting the baffle positions
shown in Fig. 23.
14.7 Re-commission the Burner.
1. Connect the flexible oil supply hose to the isolating valve bulk-
head fitting and tighten sufficiently to form a good seal. Where a
( f )
double pipe system is being used connect the oil return flexible
hose to return pipe fitting.
2. With the sponge O-ring gasket around the burner blast tube
insert the burner into the housing tube. Push the burner firmly for-
ward to compress the gasket and tighten the two locking screws
using a 5mm Allen key.
Note: It is important that a good seal is made between the burner
and the boiler to prevent re-circulation of the flue gases from the
combustion chamber to the burner inlet, or the room in the case of
a CF/LLD appliance.
3. On the RS balanced flue model feed the electrical lead back
through the hole in the burner surround housing and fit the grom-
met into the hole ensuring a seal is made.
4. Reconnect the electrical lead plug into the control box.
5. Turn on the oil supply at the service cock.
6. Re-commission the burner as described in Section 12.
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