14 Replacement of Parts
Diagram 14.2
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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.
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 under
-
side of the front casing and lift off.
The side panels can be removed to aid replacement of parts.
To hinge a side panel undo and remove the four screws secur
-
ing each side panel to the boiler, two below and two at the top.
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 mounting
jig. Attach a length of hose to the drain point and open the drain
valve, see diagram 14.1.
After replacing parts, close the drain valve and remove the
hose. Open the heating flow and return isolating valves and
refill, vent and pressurise the heating circuit, refer to section 11.
Check for leaks.
14.3 Draining of Boiler Hot Water Circuit
Drain the Domestic Hot Water circuit by closing the cold-water
isolation valve on the wall mounting jig, see diagram 14.1.
Open one or more hot water taps to drain the hot water circuit.
After replacing parts open the cold-water isolation valve and
slowly open a hot water tap to remove air. Close the hot water
tap and check for any leaks.
14.4 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 14.2.
14.5 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
14.2.
14.6 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 14.3.
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Diagram 14.1
Diagram 14.3
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