Bosch Worcester GREENSTAR 12i System Instruction Manual page 43

A
8.1
E
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER BOSCH GREENSTAR 12i System/24i System
8 716 107 375a (02/05)
5.1
7
D
8.2
F
REPLACEMENT OF PARTS
5.2
Access to the following compo-
nents require the control to be
moved in to the service position:
Gas valve
Siphon
PCB fuse
Transformer
5. Moving boiler control to service
position
5.1 Remove screw (A) securing control.
5.2 Gently pull forward.
6. Gas valve
6.1
Isolate gas supply at boiler gas cock.
6.1 Remove wire clip from gas valve outlet then
pull gas adjustment assembly free from
plastic connector and pull forward clear of
case.
6.2 Undo bottom gas connection to gas valve.
6.3 Undo two securing screws (C) on the
underside of casing.
Pull valve up and forward out of boiler.
Disconnect electrical connections.
Replace valve with new seals and check for
gas soundness.
Note: The valve will require setting; follow
procedure "Setting the gas/air ratio" in the gas
conversion section.
6.2
7. Gas adjuster
Isolate gas supply at boiler gas cock.
Repeat step 6.1 above.
Twist retaining clip (D) to release then
remove clip and tube.
Refit new adjuster and secure with clip.
8. Siphon
8.1 Undo plastic nut (E) on the siphon outlet.
Drop condensate tube away from siphon.
8.2 Remove hose (F).
8.3 Remove siphon.
6.3
C
8.3
REPLACEMENT OF PARTS
42