Worcester Greenstar 12i System Instruction Manual page 43

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~ORCESTER
Bosch GllMIP
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I~IU.'iflON 6 SEIMONG lliSIRVCTlONS FOR WORCESTER GAttNStNI 13 S,~
Stl!UI
8 716112055a(C4105)
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REPLACEMENT OF PARTS
PRETTLE VALVE CE427
Access to the following compo-
nents requ i re the control to be
moved in to the service position:
Gas va lve
Siphon
PCB fuse
Transformer
5. Moving boller control to service
position
5.1 RemO\f() screw (A) securing conttol.
5.2 Gentiy pull forward.
6. Gas valve'
• Isolate gas suppo/ at boiler gas oock.
6.1 Remove wire dip from gas valve ovttet then
pull gas adjustment assembly free from
plastic connector and pull forward cleor of
case.
6.2 Undo bottom gas conooction to gas valva.
6.3 Undo two securing screws (C) on the
underside of casing.
• Pv11
~tve
vp and forward out of boiler.
• Disconnect electrical connections.
• Replace vatve with new seals and ched< for
gas soundness.
Note: The valve will require setting; follow
procedure "Setting the gas/air ratio" in
the
gas
cornersiotl section.
7. Gas
adjuste.-
• Isolate gas suppo/ at boiler gas cock.
• Repeat step 6.1 above.
• T wist retaining clip (D) to release then
remove clip
and
tube.
• Refit new adjuste( and secure with dip .
a.
Siphon
8.1 Undo plastic nut (E)
ot1
tho siphon outlet
Q(op condensate tube awat from siphon •
8.2 Remoore hose (f) .
8.3 Remove siphon.
•Refer al so t o page 43 as on
a pplian ces t h e va lve an d a<ljusto"
hav• been changed .
REPLACEMENT OF PARTS