Worcester Greenstar 12i System Instruction Manual page 44

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REPLACEMENT OF PARTS
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REPLACEMENT OF PARTS
SIT AND DUNGS VALVES
The following components require
the control to be moved in to the
service position:
Gas valve
Siphon
PCB fuse
Transformer
REMOVAL OF THE ADJUSTER AND
VALVES IS THE SAME FOR BOTH S IT
AND DUNGS VALVES. THE SIT VALVE IS
SHOWN IN THE DIAGRAM.
ON SOME EARLIER APPLIANCES A
DIFFERENT GAS VALVE IS USED. REFER
TO PAGE 42 FOR THIS INFORMATION.
5. Moving boiler control to service
position
6.1 Remove screw (A) securing control •
5.2 Gentiy pull forward .
G .
Gas
valve•
• lsofate gas supply at boiler gas oock.
6.1 Remove wire d ip ffom gas valve outlet then
pull gas adjustment assembly free from
plastic: c:of"'u'lectOf' and pull fOI'VIat'd cleat of
case
6.2 Undo bottom gas oonnection to
gas
valve.
6.3 Undo two securing screws (C) on
the
underside o1 casing.
• Putl valve up and forward out of boiler.
• Disconnect electri¢8.1 connections.
• R0plac:e valve with Mw seals aoo check tor
gas soundness .
Note: The valve will require setting; follow
procedure "Setting the gas/air ratio" in the gas
conversion section •
7. Valve outlet elbow
~ Isolate gas supply at boi1<!f gas cock and
rep""'t step 6.1 above.
~
Twist
retaini"9
clip (D)
to
release then
remo...e clip and tube.
• Refit new valve outlet elbaw and serure
with clip.
8. Siphon
8.1 Undo plastic nut
(E)
on the siphon ovttet
Drop condensate tube away ffom siphon.
8.2 Remove
hose
(F).
8.3 Remove siphon.
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