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
SECURING SCREW (4)
LIGHTS BRACKET
LOCKNUT HIGH/LOW
CONTROL
Diagram 14.6
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.
SECURING |
|
SCREW (2) |
|
AIR PRESSURE |
|
SWITCH |
|
ELECTRICAL |
|
CONNECTIONS (3) |
|
GREY | GREY |
| |
| YELLOW |
BROWN |
|
CLEAR | RED |
AIR PRESSURE | |
SWITCH TUBES | |
| Diagram 14.7 |
UNION CONNECTIONS
SECURING
SCREWS (6)
SPARK
ELECTRODE
INJECTOR CONDENSATE
MANIFOLD TUBE
Diagram 14.8
221834B | 36 |
