31
Alpha HE CB25/33, SY25 - Component Replacement
8.25 PRESSURE RELIEF VALVE - Fig. 30
1.
Gain access behind the casing and drain the boiler heating circuit as described in Sections 8.1 and 8.2.
2.
Remove the four screws securing the bottom tray and remove the tray. Disconnect the pressure relief valve outlet fitting.
3.
Release the screw retaining the pressure relief valve and pull out the valve.
4.
Re-assemble in reverse order.
5.
Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
8.26 DHW HEAT EXCHANGER (HE CB25/33 only) - Refer to Fig. 31
1.
Gain access behind the casing and drain the boiler heating and hot
water circuits as described in Sections 8.1 and 8.2.
2.
Disconnect the three union nuts to the heat exchanger and remove
heat exchanger by lifting it upwards from the rear right hand side 'O'
ring seal connection.
Note:
Be careful not to allow water to drip onto any electrical
components.
3.
Using the new washers supplied, re-assemble in reverse order.
4.
Refill and pressurise the system. (Refer to Commissioning, Section
5.1).
8.27 MAINS WATER INLET FILTER (HE CB25/33 only) - Fig. 13
1.
Drain the boiler hot water circuit as described in Section 8.2. Remove
the four screws securing the bottom tray and remove the tray.
2.
Withdraw the filter after disconnecting the unions between the inlet
valve and boiler, item H in Fig. 11.
3.
Clean or replace and re-assemble in reverse order.
8.28 DIVERTER VALVE ASSEMBLY (HE CB25/33 only) - Figs. 28 and 32
1.
Gain access behind the casing and drain the boiler heating
and hot water circuits as described in Sections 8.1 and 8.2.
2.
Remove the domestic hot water heat exchanger and flow
switch assemblies from the diverter valve as described in
Sections 8.23 and 8.15.
3.
Disconnect the union connections from the diverter valve.
4.
Release the screws shown in Fig. 28 and raise the valve
slightly to disengage it from the manifold, then lift it out of the
boiler.
5.
Re-assemble in reverse order using the new seals supplied.
6.
Refill and pressurise the system. (Refer to Commissioning,
Section 5.1).
8.29 DHW FLOW VALVE (HE CB25/33 only) - Fig. 32
1.
Remove the diverter valve as described in Section 8.28.
2.
Unscrew (not necessary to remove) the two screws securing the
DHW flow valve to the diverter valve and withdraw the valve.
3.
When re-assembling, push the new valve into position, holding it in, while tightening the fixing screws.
4.
Re-assemble in reverse order.
Fig. 31 HE CB25/33 only
Fig. 32 HE CB25/33 only
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...
