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49
GAS SERVICE COCK
DRAIN POINTS
14 Replacement of Parts
14.1 General
Replacement of parts must be carried out by a competent
person.
Before replacing any parts the boiler should be isolated from
the mains electric supply and the gas should be turned off at
the service cock on the boiler, see diagram 14.1.
Ensure that components with electrical connections are
disconnected before removal.
Unless stated otherwise parts are replaced in the reverse
order to removal.
After replacing any parts always test for gas soundness and if
necessary carry out functional test of the controls.
For replacement of parts the front casing of the boiler will
need to be removed.
To remove undo the two screws on the
underside of the front casing and lift off.
14.2 Draining of Boiler Heating Circuit
Drain down the Heating Circuit of the boiler only, by closing
the heating flow and return isolating valves on the wall mount-
ing jig.
Attach a length of hose to the drain point and open the drain
valve, see diagram 14.1.
Check for leaks.
14.3 Igniter Unit
For access, refer to section 14.1.
Remove ignition lead and electrical connections then remove
igniter unit by removing two securing screws, see diagram
12.8.
14.4 Ignition Lead
For access, refer to section 14.1.
Pull the spark plug style connector off the spark electrode
and the spade connector connected to the igniter unit, see
diagram 12.8.
14.5 Silencer Assembly (front)
For access, refer to section 14.1.
Pull forwards to remove.
The silencer is a push fit so no tools or fixings are required for
its removal or fitting, see diagram 12.7.
Diagram 14.1
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