29
Alpha HE CB25/33, SY25 - Component Replacement
8.16 CLOCK (if fitted) - Refer to Fig. 21
Note:
When replacing a clock, only use a single channel clock for the HE CB25/33 and a two channel clock for the HE SY25
boiler. Refer to Section 2.9 and 4.9.
1.
Gain access behind the control panel as described in Section 8.1.
2.
Remove the two screws securing the clock cover at the rear of the control panel.
3.
Disconnect the wiring from the clock.
4.
Remove the clock retaining screws and withdraw the clock from the control panel.
5.
Fit the new clock, ensuring the wires are connected correctly. Refer to Section 4.9.
6.
Re-assemble in reverse order. Refer to the User's instructions and the boiler's control cover to set the clock.
8.17 PRIMARY HEAT EXCHANGER
1.
Gain access to the combustion chamber and drain the boiler heating circuit as described in Sections 8.1 and 8.2.
2.
Remove the five screws securing the combustion chamber front cover and remove the cover.
3.
Remove the overheat thermostat (Section 8.9) and the primary temperature sensor (Section 8.21).
4.
Remove the right hand side baffle plate by lifting it up.
5.
Disconnect the two unions from the heat exchanger flow and return pipes.
6.
Slide the heat exchanger off the pipes and remove it by carefully withdrawing it out of the boiler.
7.
Re-assemble in reverse order.
8.
Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
8.18 CONDENSING HEAT EXCHANGER - Fig. 24
1.
Remove the fan as described in Section 8.7.
2.
Drain the boiler as described in Section 8.2.
3.
Disconnect the two primary flow and return connections and disconnect the flue limit thermostat connection.
4.
Remove the two screws securing the flue hood and slide it forwards from the heat exchanger.
5.
Remove the righthand screw securing the condensing heat exchanger, lower the heat exchanger from the flue adaptor
and pull it forwards and out of the condensate socket in the rear panel.
6.
Fit a new heat exchanger and re-assemble in reverse order.
7.
Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
8.19 COMBUSTION CHAMBER INSULATION
1.
Gain access to the combustion chamber as described in Section 8.1.
2.
Remove the screws securing the combustion chamber cover and remove the cover.
3.
The front and right hand side insulation panels slide out.
4.
To replace the rear and left hand side insulation panels, remove the heat exchanger as described in Section 8.16.
5.
Remove the two screws securing the left hand side panel. Slide out the side panel, then prise out the top of the rear
insulation panel and lift it up and out of the boiler.
6.
Fit new panels and re-assemble in reverse order.
7.
Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
8.20 PRESSURE GAUGE - Fig. 24
1.
Gain access behind the casing and drain the boiler heating circuit
as described in Sections 8.1 and 8.2.
2.
Remove the nut securing the pressure gauge sensor and withdraw
the sensor.
3.
Depress the two lugs on the pressure gauge and push it out of the
control panel.
4.
Fit the new gauge using a new washer on the manifold connection
if necessary.
5.
Refill and pressurise the system. (Refer to Commissioning, Section
5.1).
Fig. 29
Содержание Benchmark HE CB33
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...
