Worcester Benchmark Danesmoor Utility 12/14 Installation And Servicing Instructions page 25

Fig. 25. Location of cap retainer (32/50 and
50/70 models) and location of top baffle. (32/50
model only).
Access Door
Top Baffle
(32/50 model
only)
2. Clean the fan impeller using the following procedure:
Electro-oil Inter B9 Burner
(a) Remove the two screws holding the combustion head in
position and withdraw the combustion head and air guide
collar (where fitted).
(b) Remove the three remaining screws holding the front
cover plate in position and withdraw the cover to expose
the fan impeller.
(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.
(f) Re-assemble the components.
Electro Oil Sterling
(a) Remove the air adjustment cover.
(b) Separate the main body of the burner from the burner
front by removing the M6 allen screw (located beneath the
air adjustment screw), using a 4mm allen key.
Check the condition of the Gasket between these two parts
and replace if necessary.
(c) Note the position of the air damper adjustment and check
the air damper moves freely.
(d) Check the air path to the burner head is clear.
(e) Clean both sides of the fan impeller and remove any debris
from the burner housing.
(f) Check the impeller rotates freely.
(g) Re-assemble the components.
Electro Oil Inter B20
(a) Remove the four screws holding the fan cover and remove.
(b) Clean both sides of the fan impeller and remove any debris
from the burner housing.
Cap Retainer
Cap
(c) Check that the impeller rotates freely.
(d) Clean the air damper which is attached to the fan cover
and check that the adjustment mechanism operates
freely.
(e) Re-assemble the components.
3. Remove the combustion head and thoroughly clean all deposits.
Fig. 26. Mechanical Shut-off Valve.
Check Valve
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 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. 18, 19, 20, 21, 22 and 23.
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. 18, 19, 20, 21, 22 and 23.
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.
25
Nozzle Assembly
A