Worcester GREENSTAR 12i Instruction Manual page 48

E
48
REPLACEMENT OF PARTS
A
13
D
15.1
12.1
B
C
14
F
G
15.2
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 12i/24i System
REPLACEMENT OF PARTS
12.2
12. 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.
Check CO/CO 2 levels as described in
the "setting the air/gas ratio" section.
12.3
13. Electrode assembly
Disconnect spark electrodes and flame
sensor connection.
Remove clamping plate (D).
Remove spark/flame electrode assembly (E)
from heat exchanger.
Check CO/CO 2 levels as described in
the "setting the air/gas ratio" section.
14. 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.
Check CO/CO 2 levels as described in
the "setting the air/gas ratio" section.
15. Heat Exchanger
Isolate flow and return valves then drain the
boiler.
Remove siphon.
15.1 Release captive clip from plastic elbow on
the flow pipe and pull flow pipe away from
heat exchanger.
15.2 Remove plastic nut from the bottom of
the boiler.
15.3 Rotate lever to release return pipe.
15.4 Undo flue connection from sump.
Pull heat exchanger assembly up to clear.
Reassemble and check combustion as
stated in the gas conversion section.
Check CO/CO 2 levels as described in
the "setting the air/gas ratio" section.
15.3
8 716 115 167b (03/2009)
15.4