27
Alpha HE CB25/33, SY25 - Component Replacement
8.5
MAIN BURNER
1.
Remove the burner 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 as described in Routine Servicing, Section 7.2.
2.
Unscrew the damaged injector and screw in a replacement.
Note:
When replacing an injector always use the washer supplied with the injector between the injector and the gas manifold.
3.
Re-assemble as described in Routine Servicing, Section 7.4.
8.7
FAN - Fig. 24
1.
Gain access to the combustion chamber as in Section 8.1.
2.
Remove the air pressure switch as described in Section 8.8.
3.
Disconnect the fan wiring.
4.
Remove the two screws securing the fan to the back panel. Slide the fan to the left and remove from the condensing heat
exchanger. Fit the new fan and re-assemble in reverse order.
Note:
Connect the fan wiring, blue to terminal N, brown to terminal L and green/yellow to terminal
.
5.
Re-assemble and test the boiler as described in Routine Servicing, Section 7.4 paragraphs 5 to 9.
8.8
AIR PRESSURE SWITCH - Fig. 24
1.
Gain access to the combustion chamber as in Section 8.1.
2.
Disconnect the pressure sensing tube.
3.
Disconnect the wiring and remove the switch from the clip.
4.
Connect the wiring to the new switch. The polarity of the wires is not important.
5.
Secure the new switch in position and connect the pressure sensing tube to the connection nearest the fan.
6.
Re-assemble in reverse order.
8.9
OVERHEAT THERMOSTAT - Fig. 24
1.
Gain access to the combustion chamber as in Section 8.1.
2.
Disconnect the wiring from the overheat thermostat.
3.
Unscrew the overheat thermostat from the heat exchanger.
4.
Fit the new overheat thermostat and re-assemble in reverse order.
8.10 FLUE LIMIT THERMOSTAT - Fig. 24
1.
Gain access to the combustion chamber as in Section 8.1.
2.
Remove the fan as in Section 8.7.
3.
The flue limit thermostat is located behind the condensing heat exchanger on the left hand side (see Fig. 24).
4.
Disconnect the inline connector from the thermostat.
5.
Using a 17 mm spanner unscrew the thermostat from the rear of the heat exchanger and disconnect the wiring from the
thermostat.
6.
Fit a new limit thermostat and re-assemble in reverse order.
Fig. 25
Flame sensing electrode
2 to 4 mm
5 to 6 mm
Ignition electrodes
7 mm HE CB33
9 mm HE CB25
Содержание Alpha HE CB25
Страница 33: ...33 9 1 HE CB25 33 ILLUSTRATED WIRING DIAGRAM Alpha HE CB25 33 SY25 Wiring Diagrams 9 WIRING DIAGRAMS...
Страница 34: ...34 Alpha HE CB25 33 SY25 Wiring Diagrams 9 2 HE SY25 ILLUSTRATED WIRING DIAGRAM...
Страница 35: ...35 9 3 HE CB25 33 FUNCTIONAL FLOW WIRING DIAGRAM Alpha HE CB25 33 SY25 Wiring Diagrams...
Страница 36: ...36 9 4 HE SY25 FUNCTIONAL FLOW WIRING DIAGRAM Alpha HE CB25 33 SY25 Wiring Diagrams...
Страница 38: ...38 Alpha HE CB25 33 SY25 Fault Finding 10 3 DOMESTIC HOT WATER HE CB25 33 only Follow operational sequence...
Страница 39: ...39 Alpha HE CB25 33 SY25 Fault Finding 10 4 FAULT FINDING SOLUTIONS A to F...
Страница 40: ...40 Alpha HE CB25 33 SY25 Fault Finding 10 5 FAULT FINDING SOLUTION SECTIONS G to J...
Страница 41: ...41 Alpha HE CB25 33 SY25 Fault Finding 10 6 FAULT FINDING SOLUTION SECTIONS K to L...
