12.0 CHANGING COMPONENTS
42
12.23
Gas Valve
(Fig. 68)
1. Turn the gas cock off and undo the nut on the gas
feed elbow under the boiler.
2. Remove the screws securing the inlet pipe flange
to the boiler bottom panel.
3. Pull off the earth lead and sensing pipe.
4. Undo the nut on the venturi inlet pipe and slacken
the nut on the venturi. Ease the pipe aside and
remove the gas valve.
5. Remove the outlet adaptor and inlet pipe and
transfer them to the new valve. Examine the ‘O’ ring
seals, replace if necessary.
6. Reassemble in reverse order.
IMPORTANT: The CO
2
must be checked and
adjusted as detailed in Section 13.0
Combustion Check
12.24
Expansion Vessel
(Fig. 69)
1. Drain the primary circuit and undo the nut on the
vessel connection pipe.
2. Undo and remove the locknut and spring washer
securing the vessel spigot to the boiler air box.
3. Remove the bracket and vessel from the boiler.
4. Locate the retaining bracket on the upper flange of
the vessel and fit to the boiler.
5. Reassemble in reverse order.
Gas Valve
Valve
Inlet Pipe
Gas Feed
Elbow
Fig. 68
Ignition
Lead
Expansion Vessel
Boiler
Chassis
Lock Nut
Spring
Washer
Fig. 69
Retaining Bracket
Sensing
Pipe
Venturi Inlet
Pipe
Outlet Adaptor
Publication No. 5116282
Содержание Gold 24 HE
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