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14 Replacement of Parts
14.1 General
Refer to Diagram 14.3 for the overall view of disassembled
items.
Replacement of parts must be carried out by a competent per-
son.
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 dis-
connected 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.
14.2 Draining of Boiler Heating Circuit
Drain down the Heating Circuit of the boiler only, by closing the
heating fl ow and return isolating valves. Attach a length of hose
to the drain point and open the drain valve, see diagram 14.2.
After replacing parts, close the drain valve and remove the
hose. Open the heating fl ow and return isolating valves and re-
fi ll, 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, 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.
Diagram 14.1
GAS
COCK
COLD
WATER
VALVE
HEATING
RETURN
VALVE
HEATING
FLOW
VALVE
Diagram 14.2
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