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33
221504A
Diagram 14.5
AIR PRESSURE SWITCH
14 Replacement of Parts
AIR PRESSURE
SWITCH TUBES
RED
CLEAR
SECURING
SCREWS
3331
14.10 Gas Valve: Diagram 14.6
Remove the gas valve cover, retaining screw, see diagram
10.1.
Disconnect the electrical connections at the gas valve.
Disconnect the pilot tube nut at the gas valve.
Support the gas valve, remove the four extended screws from
the flanged connections at each end of the valve and remove
the valve by easing the flanges apart.
Make sure that the new “O” rings are in place in the flanged
connections when replacing.
It will be necessary to purge the pipework and valve before
relighting and checking the pressure settings, refer to section
“Commissioning”.
14.11 Solenoid: Diagram 14.7
Remove the gas valve cover, retaining screw see diagram 10.1.
Disconnect the electrical connections of the solenoid that is to
be replaced.
To remove the retaining clip, put a screw driver blade into the
hole of the clip, lever off to the left and remove the solenoid.
Diagram 14.6
GAS VALVE
Diagram 14.7
SOLENOID
ELECTRICAL
CONNECTIONS
EXTENDED
SECURING SCREW (4)
PILOT TUBE
NUT
EARTH
CONNECTION
ELECTRICAL
CONNECTIONS
RETAINING
CLIP HOLE
RETAINING
CLIP
SOLENOID
3333 3332
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