Bosch WORCESTER DANESMOOR UTILITY 12/14 Installation And Servicing Instructions page 20

burner has gone to lockout. In this instance wait two minutes and
press the lockout reset button to initiate another start sequence.
Repeat the procedure until a flame is established.
Note: Persistent lockout when running indicates a fault and a
Service Engineer should be consulted.
12.11 Run the boiler for approximately 3 minutes and switch off
checking that there is no after-spurting from the nozzle. This can
be detected by oil saturation on the blast tube. If after-spurting
occurs remove the burner from the boiler, unscrew the nozzle,
and while holding the burner in a vertical position, fill the nozzle
holder with oil and refit the nozzle. Replace the burner and
continue to run the boiler for three minute periods until after-
spurting stops.
Note: In order that after-spurting is reduced to a minimum
during the commissioning period it is recommended that a
pressure gauge only is fitted on the external pressure gauge port
on the Electro Oil B11 (See Fig. 20). Use of a "T" piece pressure
gauge manifold will increase the oil line volume and hence
increase the degree of after-spurting.
12.12 Run the boiler for a further 15 minute period and then
finally fine tune the air shutter setting to give the CO
specified in Tables 2 to 8 less 0.5%CO . During this period some
smoke will be emitted due to the burning of the organic binder in
the base insulation board. Smoke readings will therefore be
inaccurate at this point.
Note: A flue gas sampling point is located on the boiler top plate.
12.13 Check that the smoke reading is in the range 0-1. If this
cannot be achieved then check that the burner head is set
correctly and the nozzle is in good condition.
Fig. 18. Electro Oil Inter B9A Burner.
(12/14 model)
Combustion Head
2mm
A
10mm
Draught tube
Output
kW Head Type
12 PL 6/7/21.5/10-E
14 PL 6/7/21.5/10-E
To adjust the nozzle position, undo the
locking screw located at the rear of the
nozzle line and rotate the adjusting
disc one turn anti-clockwise to move
forward by 1 mm.
Spark gap
2 -2.5 mm
Nozzle block
Nozzle
Dimension
A
3 mm
5 mm
12.14 Check that the flue temperature does not exceed the
value specified in Tables 2 to 8. If this is the case then check that
the baffles are correctly located. If the baffles are correctly
located then reduce the pump pressure since nozzle variations
of up to + or – 15% may occur.
12.15 Remove the oil pressure gauge and manifold and check
all oil system joints for any signs of leakage.
12.16 On the RS balanced flue model fit the burner cover box
supplied in the flue terminal kit by lining up the four ball studs
and the polarising pin in the top flange of the box and firmly
pushing forward. Check that the cover is properly seated by
pressing forwards on the front top and then bottom face of the
box to ensure a room seal is achieved.
12.17 Allow the burner to run for a further five minutes and
then recheck the CO
required. Check that the smoke number is in the range 0-1.
Repeat the fine tuning procedure if found necessary.
12.18 Refit the cabinet top and front panels in the reverse
order to that described in Section 5.
12.19 When the heating circuit has reached full operating
level
temperature check the whole system for any leaks.
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12.20 Add a suitable proprietary corrosion inhibitor such as
Fernox or Sentinel. This will inhibit corrosion, protect the
circulating pump and valves and reduce the possibility of
"kettling" noises resulting from deposits of scale and sludge in
the boiler. Refer to the product manufacturers instructions for
further information.
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level and adjust the air setting if
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