Worcester 12/14 Installation And Servicing Instructions page 21

boiler is shut down. The lockout indicator light in the boiler control
panel will illuminate indicating that the burner has gone to lockout.
In this instance wait two minutes and press the lockout reset button
mounted in the burner control box. Another start sequence is then
initiated. 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-spurt-
ing occurs remove the burner from the boiler, unscrew the noz-
zle, and while holding the burner in a vertical position, fill the
nozzle holder with oil. Refit 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. 22). 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
fied in Tables 2 to 4 less 0.5% CO
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. 20. 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.
level speci-
2
. During this period some
2
Photocell
Spark gap
2.0-2.5 mm
Adjusting
disc
Nozzle block
Nozzle
Dimension
Pressure Adjustment
A
Screw
3 mm
5 mm
Oil pump
Air control indicator
Air adjustment screw
(4mm hexagonal head)
12.14 Check that the flue temperature does not exceed the
value specified in Tables 2 to 4. 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.
On the CF/LLD model fit the cabinet front panel.
12.17 Allow the burner to run for a further five minutes and
then recheck the CO
2
With the burner cover/panel fitted as 12.16, repeat the previous
test procedure and 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 tem-
perature check the whole system for any leaks.
12.20 Add a suitable proprietary corrosion inhibitor such as
Fernox or Sentinel. This will inhibit corrosion, protect the circu-
lating 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 infor-
mation.
Locking screw
21
level and adjust the air setting if required.
Lockout reset button
Combustion head
Transformer
Control box