23
Alpha CB50 - Component Replacement
8.4
IGNITION ELECTRODE LEAD - Refer to Fig. 26
1.
Gain access as in section 8.1 and withdraw the burner as in section 8.3.
2.
Disconnect the lead from the electrodes.
3.
Disconnect the lead from the PCB, noting its position (see Fig. 26).
4.
Fit the new lead ensuring it is correctly routed in the control panel cover and the grommet is fitted correctly in the bottom of
the combustion chamber.
5.
Re-assemble in reverse order.
8.5
MAIN BURNER
1.
Remove the burner assembly as described
in Routine Servicing, section 7.2.
2.
Re-assemble with a new burner as
described in Routine Servicing, section 7.4.
8.6
BURNER INJECTORS
1.
Remove the burner assembly as described
in Routine Servicing, section 7.2.
2.
Remove the four screws securing the
burner to the injector manifold and remove
the burner.
3.
Unscrew the damaged injector and screw in a replacement.
4.
Re-assemble as described in Routine Servicing,
section 7.4.
8.7
FAN - Fig. 22
1.
Gain access as in section 8.1.
2.
Disconnect the primary temperature sensor
lead, the overheat thermostat wiring
connections and the air pressure tube
connection at the fan.
3.
Remove the four screws securing the flue hood
and the two screws securing the fan, then
remove the flue hood and fan.
4.
Lower the fan assembly out of the flue bend and
withdraw the assembly horizontally from the
front of the chamber. Disconnect the wiring from
the fan when it becomes accessible.
5.
Remove the two screws securing the fan to the
mounting plate.
6.
Fit the new fan to the mounting plate and re-
assemble in reverse order.
Note: Connect the fan wiring, Blue and Brown wires to the terminals on the motor (polarity not important) and the Green/
Yellow wire to the earth terminal (
).
Ensure the pressure tube is connected and the flue bend and flue hood are located correctly.
7.
Test the boiler as described in Routine Servicing, section 7.4 paragraphs 5 to 9.
8.8
AIR PRESSURE SWITCH - Fig. 22
1.
Gain access as in section 8.1.
2.
Disconnect the pressure sensing tubes, noting their positions.
3.
Remove the two fixing screws and disconnect the wiring.
4.
Remove the two screws securing the mounting bracket to the switch and transfer the bracket to the new pressure switch.
5.
Connect the wiring to terminals 1 and 3 on the new switch (polarity is not important), and reconnect the pressure tubes as
previously connected, i.e. fan connection to P2.
6.
Secure the new switch in position.
7.
Re-assemble in reverse order.
Fig. 22
Fig. 21
Fig. 20
Flame sensing electrode
2 to 4 mm
5 to 6 mm
Ignition
electrodes
5 to 6 mm
Fan
Air pressure switch
Pressure tube
connection
Fan securing
screw
Fan securing
screw
Flue bend
Flue hood
securing
screws
Primary
temperature
sensor
Overheat
thermostat
Flue hood
securing
screws
Flue hood
Содержание Alpha CB50 Boiler
Страница 29: ...29 9 WIRING DIAGRAMS 9 1 ILLUSTRATED WIRING DIAGRAM Alpha CB50 Wiring Diagrams ...
Страница 30: ...30 9 2 FUNCTIONAL FLOW WIRING DIAGRAM Alpha CB50 Wiring Diagrams ...
Страница 32: ...32 Alpha CB50 Fault Finding 10 3 DOMESTIC HOT WATER Follow operational sequence ...
Страница 33: ...33 Alpha CB50 Fault Finding 10 4 FAULT FINDING SOLUTIONS A to F ...
Страница 34: ...34 Alpha CB50 Fault Finding 10 5 FAULT FINDING SOLUTION SECTIONS G to L ...
