Worcester DANESMOOR 15/19 Installation And Servicing Instructions page 25

Fig. 27. Mechanical Shut-off Valve.
Nozzle Assembly
Check Valve Check Valve
4. Inspection of Mechanical Shut-off Valve. (See Fig. 27)
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 3 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. 21, 22, 23 and 24.
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. 21, 22, 23 and 24.
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
combustion 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 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 M10 nuts
and check the fibreglass rope seal. Replace the seal if necessary.
2. Remove the burner mounting flange by releasing the three
A
25
M10 nuts and check the fibre glass gasket, it is imperative that
this seal is in good condition Replace the seal if necessary
(32/50 and 50/70 models only).
3. Remove and check the baffle retainer, where fitted (20/25,
26/32, 32/50 and 50/70 models). See Fig. 25.
4. Remove the baffles, clean and check their condition. Replace
any baffles considered to be badly corroded.
5. Remove and check the cap retainer, where fitted (32/50 and
50/70 models only). See Fig. 25d & 26.
6. Remove the cap (32/50 and 50/70 models only) and check
the 'rocksulate' gasket. Replace the seal if necessary.
7. 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
insulation!
8. Remove and check the heat shield where fitted (20/25,
26/32, 32/50 and 50/70 models). (See Fig. 25).
9. Check the condition of the combustion chamber base
insulation and replace if there is any sign of significant damage.
10. Check and clean the flue.
11. Replace the items in reverse order noting the baffle positions
shown in Fig. 25.
14.7 Fire Valve.
Check that a fire valve is fitted to the incoming oil line with the
body located outside the premises and the detection element
located within the appliance case. A fire valve clip is provided
for this purpose as shown in Figs 2 & 3. Test the operation of the
fire valve to ensure that the mechanism operates and that the
oil supply is completely isolated.
NOTE: The fire sensing element must be located on the top face
of the burner surround box on RS balanced flue models, as
shown in Fig.3, to allow quick detection of a dangerous
situation.
14.8 Recommission the Burner.
1. Connect the flexible oil supply hose to the isolating valve and
tighten sufficently to form a good seal. Where a 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
forward to compress the gasket and tighten the two locking
screws.
Note: It is important that a good seal is made between the
burner and the boiler to prevent re-circulation of the 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 (in the reverse
order to that described in 11.2) and fit the grommet 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. Recommission the burner as described in Section 12.