Supplied By www.heating spares.co Tel. 0161 620 6677
Manual No. 405/0101
ANNUAL SERVICE
26
ANNUAL SERVICE - PAGE 26
7.2
DISMANTLING PRIOR TO SERVICING
Refer to Figs. 32, 33 and 34.
1.
Turn off the gas supply at the gas service cock (bottom
L.H. corner).
2.
Remove the screw securing the control box, see Fig. 25
and lower the control box.
3.
Remove the two tie rods from the retaining clips on the
front of the expansion vessel frame and remove the split
pins from the ends of the rods. Remove the two screws
securing the expansion vessel support frame to the inner
case front panel. Hook the plain ends of the tie rods into
the brackets on the sides of the boiler. Carefully lower the
expansion vessel and frame (hinged at the bottom).
Locate the other ends of the tie rods in the brackets on
the expansion vessel frame, then pass the split pins
through the ends of the rods to secure them in place. See
Fig. 32.
Fig. 32
4.
Remove the four screws (two at the top and two at the bottom) securing the inner case front panel and lift off the panel.
See Fig. 32.
Note: When the inner case front panel is removed, the four case seal housing channels are not secured to the boiler
as they are retained in position by the front panel. Ensure that they are correctly fitted over the chassis edges before
the front panel is replaced.
5.
Remove the two screws securing the fan assembly to the flue hood, see Fig. 33. Carefully slide the fan assembly away
from the flue to disengage the flue tube sleeve from the flue. Withdraw the fan assembly, disconnecting the fan motor
and pressure switch leads.
Note: If a Vertex Flue is fitted, slide the flue tube sleeve up into the flue to disengage it from the fan outlet.
6.
Remove the push rod assembly and the leads from the overheat cut-off device, see section 9.7, then remove the two
screws at each side of the flue hood securing the blanking plates and lift out the plates. See Fig. 33.
Note: On the 80 model these four screws are the only ones securing the flue hood.
7.
All models except 80 - Remove the four screws securing the flue hood - two at the back (extended screws) and two at
the front. See Fig. 33.
8.
Lift the flue hood off the boiler.
9.
Remove the six screws (four on 80 model) securing the combustion chamber front cover and remove the cover.
10. Remove the bottom case seal housing channel (lifts off the chassis).
11. Undo the securing nut and remove the spark electrode, see Fig. 34, from the pilot assembly.
12. Undo the tubing nuts and disconnect the pilot supply from both the pilot assembly and gas valve.
Carefully remove and retain the pilot injector, see Fig. 34.
13. Remove the two screws (underneath the chassis) securing the small baffle infront of the burner and remove the baffle.
14. Remove the two screws securing the right hand end of the burner to the chassis. Slide the burner to the right, to
remove it from the main injector and withdraw the burner.
Fig. 33
Fig. 34
