REPLACEMENT OF PARTS
SIT AND DUNGS VALVE
REMOVAL OF THE VALVE IS THE SAME
FOR BOTH SIT AND DUNGS VALVES. THE
SIT VALVE IS SHOWN IN THE DIAGRAM.
5. Moving boiler control to service
position
5.1
Remove two screws (A) securing control.
5.2
Hang control on two lugs (B) on boiler
framework.
6. Gas valve
Isolate both the electrical supply and the
gas supply at boiler gas cock.
6.1
Remove wire clip from gas valve outlet then
pull valve outlet elbow free from the gas
valve.
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 air/gas ratio”.
7. Syphon
7.1
Undo plastic nut (D) on the syphon outlet.
Drop condensate tube away from syphon.
7.2
Remove two screws (E) retaining the bracket.
7.3
Pull the syphon towards you to release
from the connection and remove.
D
The following components require
the control to be moved in to the
service position and the bottom
tray removed:
Gas valve
Syphon
PCB fuse
Transformer
5.1
5.2
A
6.2
6.3
7.3
7.2
7.1
B
E
C
6.1
REPLACEMENT OF PARTS
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR Ri
8 716 115 168a (06/2008)
42
S
E
RV
ICI
N
G
& S
P
AR
E
S
IMPORTANT:
Do not replace the gas valve if a
CO/CO
2
analyser is NOT available.
