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221834B
Diagram 14.8
CONDENSATE
TUBE
UNION CONNECTIONS
SECURING
SCREWS (6)
INJECTOR
MANIFOLD
SPARK
ELECTRODE
Diagram 14.6
Diagram 14.7
SECURING
SCREW (2)
SECURING SCREW (4)
LIGHTS BRACKET
LOCKNUT
HIGH/LOW
CONTROL
AIR PRESSURE
SWITCH
ELECTRICAL
CONNECTIONS (3)
GREY
BROWN
CLEAR RED
AIR PRESSURE
SWITCH TUBES
GREY
YELLOW
14 Replacement of Parts
14.7 Multifunctional Control: diagram 8.1.
Disconnect the screws and electrical plugs at the multifunctional
control.
Support the multifunctional control and remove the four screws
from the flanged connection, undo the union at the gas service
cock and remove the support bracket securing screw.
Remove the multifunctional control by easing the flange and
service cock apart.
Remove the union half and refit to the replacement multifunctional
valve.
Use a little jointing compound on the external thread only, to
ensure gas soundness.
Make sure that the new “O” ring is in place in the flanged
connection is replaced.
It will be necessary to purge the pipework and multifunctional
control before relighting and checking the pressure, refer to
“Commissioning”.
14.8 Fan
Refer to Section 12.1 “Heat Exchanger Cleaning”.
Make sure that the earth connection is remade onto the
replacement fan.
The polarity of the electrical connections is not important.
14.9 Injector
Refer to Servicing Section 12.3.
Fit new injector as shown.
Note: The replacement injector is supplied complete with the
gas supply pipe manifold.
14.10 Heat Exchanger: diagram 14.8
Note: To carryout the following operations it will be found more
convenient if the whole of the heat exchanger and burner are
removed as a unit.
Follow the relevant parts of Servicing Section and remove the
bypass heat shield, fan/flue hood, combustion chamber front
panel, heat exchanger baffle, spark electrode, injector and
thermostat phials.
Release the flexible tube from the condense drain trap, this is
a push-fit.
Release union connections and the six securing screws, then
remove the complete assembly.
Heat Exchanger: Secondary - diagram 14.9
Disconnect the union connector.
Remove and fit the flexible hose to the replacement.