Worcester WM 12 Installation And Servicing Instructions page 29

for this purpose on the base of the external duct to the right of
the burner as shown in fig. 30.
14.8 Re-commission the Burner.
1. Connect the flexible oil supply hoses to the connection block
as described in Section 11.5. The flexible oil line on the inlet to
the oil pump goes to the inlet on the connection block and the
flexible oil line on the return of the oil pump goes to the return
on the connection block.
2. With the sponge O-shaped gasket around the burner blast
tube insert the burner into the burner mounting flange ensuring
that the cut out in the gasket lines up with the burner retaining
screw. Push the burner firmly forward to compress the gasket
and tighten the burner retaining screw located to the left of the
control box using a 4mm hexagon driver.
Note: It is important that a good seal is made between the burn-
er and the boiler to prevent re-circulation of the combustion
gases from the combustion chamber to the burner inlet.
3. Reconnect the electrical lead plug into the external control box.
Fig. 28. Electro Oil Inter B9 Burner.
(12/19 model)
Combustion Head
8.0 mm
Blast tube
Output Dimension
kW Head Type
12/19 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.
Electrode gap
3.0 mm
Photocell
Adjusting
disc
Nozzle block
1.0 mm
Nozzle
A
Pressure Adjustment
Screw
A
Oil pump
4 mm
Burner retaining
Screw
Air control indicator
4. Turn on the oil supply at both the oil tank and between the
burner and oil filter.
5. Re-commission the burner as described in Section 12.
NOTE: After commissioning/sevicing the appliance the engineer
should position the service switch in the RUN mode as shown in
fig. 29.
Locking screw
Air adjustment screw
(4mm hexagonal head)
29
Combustion head
Transformer
Burner
Control box
Lockout reset button