Worcester Highflow 3.5 OF Installation And Servicing Instructions page 16

(g) Cabinet Lower Front Panel: Remove the five pozi-drive
screws securing the panel . . See Fig.
2.
(h) Control Box Cover: Remove the five pozi-drive screws. See
Fig. 2.
(i) Control Box: Remove the facia panel. Remove the single
pozi-drive screw in the top of the left hand side panel. See
Fig. 2. Support the box so that undue strain is not placed
upon the electrical cable and thermostat capillaries.
(J)
Left Hand and Right Hand
Gabir~et
Side Panels: Remove
the cabinet top, front and lower front panels and the control
box and facia. Remove the thrP•: screws remaining at the
top of each of the panels, or,e in the left hand and two in
the right hand panel. See Fig. 2. Di
<~w
the panels slightly
forward to release them from
th~
securing lugs in the base
plate and lift away from th::; applinr:ce.
The following components can be replacP.d if the cabinet
top panel, cabinet front panel, inner casing and
combustion chamber cover are removed. See
17
(a), (b),
(e) and
(f)
preceding.
1.
THE MAIN BURNER
(See Fig. 13.)
(a) Disconnect the thermocouple nut at the pilot burner
as~:cmbly
and ease it from the assembly.
(b) Carefully pull the electrode lead off the connector tab at
the electrode.
(c) Disconnect the pilot tube Within the combustion chamber
at the adaptor.
(ri)
Release the two extended M 5 screws securin~J the burner
manifold block at the front of the chamber.
le)
Carefully remove the burner and pilot asser11bly from the
combustion chamber by liftinsJ and pullin~J.
(f)
Hernove the pilot assembly by removing the two screws
and nuts. Remove the main inJector.
(~))
t1c assemble in the reverse order, ensure that the 0-ring
i: i,Jcated in the end of the burner manifold.
(I)
Check the gas soundness of the connection between the
bur11er manifold and the gas line. See Section 15. lioutine
Cleaning.
2.
THE MAIN INJECTOR and LINT ARRESTER
ASSEMBLY
(See Figs. 16 and 16a.)
{ai ihe Lint Arrester Assembly
1. f1~'1nove theM 5 screw securing the lint arrester assembly
;_md lift the rear frame away from the burner.
2 Remove the clip beneath the arrester assembly and lift
away the side frames to left and right.
Fig. 16.
Lint Arrestor Assembly
Main Burner Injector
16
3. Lift the front frame up and away from the burner mixing
tube.
4. Clean the gauze by shaking and washing in soapy water
or brushing with a non-metallic brush. Care must be taken
not to damage the gauze or its assembly housing.
(b) The Main Injector
1. Remove the burner.
2. Remove the lint arrester assembly.
3.
Remove the main injector from the burner.
4. Fit the new main injector and re-assemble the main burner
assembly in the reverse order.
3. THE PILOT INJECTOR, SPARK ELECTRODE, PILOT
SHIELD AND PILOT BURNER
(See Fi£JS. 18 and 19.)
(a) The Pilot Injector
Remove the main burner assembly, See Instruction
above.
( 1)
Disconnect the thermocouple nut at the pilot burner
assembly and ease it from the assembly.
(2)
Disconnect the pilor pipe from the pilot burner. Slacken
the pilot tube connection at the adaptor within the
combustion chamber and move the pilot pipe away from
the pilot assembly.
(3) The pilot injector may now be removed. It may be
necessary to carefully ease the injector free.
(4) Fit a new pilot injector and re-assemble in the reverse
order.
Fig. 16a.
Lint Arrestor Assembly
Fig. 17.
Pilot Head/Electrode Position.
3 to 4 mm 10 14m I
-~---
PILOT FLAME LENGTH
13 to 18 mm 10 5 in. to 0 751n I
L __ _