Bosch Worcester GREENSTAR 12i System Instruction Manual page 47

A
16
D
E
18.1
H
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER BOSCH GREENSTAR 12i System/24i System
8 716 107 375a (02/05)
15.1
B
C
F
G
18.2
REPLACEMENT OF PARTS
15.2
15. Fan
15.1 Remove 3 screws (A) retaining mixing
chamber.
15.2 Remove 2 screws (B) retaining the fan to
the air/gas manifold.
15.3 Remove screw (C) retaining plate and
remove.
Re-assemble with new fan ensuring seals
are correctly fitted.
16. Electrode assembly
Disconnect spark electrodes and flame
15.3
sensor connection.
Remove clamping plate (D).
Remove spark/flame electrode assembly (E)
from heat exchanger.
17. Burner
Remove seal (F) from the top of the heat
exchanger.
Remove burner (G).
Replace new burner in correct position.
Ensure that burner tab fits correctly into hole.
Ensure that the seal is replaced with a new one.
18. Heat Exchanger
Isolate flow and return valves then drain the
boiler.
17
Remove siphon.
18.1 Remove clip from plastic elbow on the flow
pipe and pull flow pipe away from heat
exchanger.
18.2 Remove plastic nut from the bottom of
the boiler.
18.3 Rotate lever to release return pipe.
18.4 Undo flue connection from sump.
Pull heat exchanger assembly up to clear.
Reassemble and check combustion as
stated in the gas conversion section.
18.3
REPLACEMENT OF PARTS
18.4
46