Worcester GREENSTAR 25Si Instruction Manual page 49

E
15.1
48
REPLACEMENT OF PARTS
12.1
A
13
D
F
15.2
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 25Si/30Si
REPLACEMENT OF PARTS
12.2
12. Fan
15.1 Remove 3 screws (A) retaining mixing
B
15.2 Remove 2 screws (B) retaining the fan to
15.3 Remove screw (C) retaining plate and
12.3
13. Electrode assembly
C
14. Burner
14
15. Heat Exchanger
G
15.1 Remove clip from plastic elbow on the flow
15.2 Remove plastic nut from the bottom of
15.3 Rotate lever to release return pipe.
15.4 Undo flue connection from sump.
IMPORTANT: IF THE JOINT BETWEEN THE AIR/GAS
MANIFOLD AND THE HEAT EXCHANGER IS DISTURBED
THE SEALING GASKET MUST BE REPLACED.
15.3
8 716 115 165a (06/2008)
chamber.
the air/gas manifold.
remove.
Re-assemble with new fan ensuring seals
are correctly fitted.
Check CO/CO 2 levels as described in
the "setting of the air/gas ratio" section.
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.
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.
Isolate flow and return valves then drain the
boiler.
Remove syphon.
pipe and pull flow pipe away from heat
exchanger.
the boiler.
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.
15.4