Technical data

27
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.
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 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 and check the baffle retainer, where fitted
(Danesmoor utility 20/25, 26/32, Worcester Bosch 70/90 and
90/110 models only) as shown in Fig. 32.
3. Remove the baffles, 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
insulation!
8. Remove and check the heat shield where fitted (Danesmoor
utility 20/25, 26/32, Worcester Bosch 70/90 and 90/110
models only) as shown in Fig. 32.
9. Check the combustion chamber base insulation and replace if
there is any sign of damage.
10. Check and clean the flue.
11. Replace the items in reverse order noting the baffle positions
shown in Fig. 32.
14.7 Fire Valve.
Check that a fire valve is fitted to the incoming oil line with the
body located outside the premises and Outdoor Pack and the
detection element located within the appliance case. A fire valve
clip is provided for this purpose as shown in Fig. 3. Test the
operation of the fire valve to ensure that the mechanism
operates and that the oil supply is completely isolated.
14.8 Recommission the Burner.
1.
Connect the flexible oil supply hose to the isolating valve and
tighten sufficiently 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, using a 5mm Allen key.
Note: It is important that a good seal is made between the
burner and the boiler to prevent recirculation of the flue gases
from the combustion chamber to the burner inlet.
3. Reconnect the electrical lead plug into the control box.
4. Turn on the oil supply at the service cock.
5. Recommission the boiler as described in Section 12.
Fig. 33. Mechanical Shut-off Valve.
Check ValveCheck Valve
Nozzle Assembly
A