24
Alpha SY24 - Component Replacement
8.21 PRESSURE RELIEF VALVE - Fig. 23
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).
8.22 EXPANSION VESSEL
Note: If there is less than 450 mm clearance above the boiler or a rear exit flue is used, it is not possible to replace the vessel,
in which case an additional vessel should be fitted external to the boiler in the central heating return pipe, as close to the boiler
as possible (see Fig. 5).
1.
Gain access behind the casing and drain the boiler heating circuit as described in sections 8.1 and 8.2.
2.
Disconnect the pipe from the pump inlet manifold and expansion vessel.
3.
Remove the four screws securing the top support plate.
4.
Lift the expansion vessel out of the boiler.
5.
When replacing the vessel, ensure that the connection is towards the front of the boiler and re-assemble in reverse order
using new seals as necessary.
6.
Refill and pressurise the system. (Refer to Commissioning, section 5.1).
Fig. 23
Summary of Contents for SY24
Page 25: ...25 Alpha SY24 Wiring Diagrams 9 1 ILLUSTRATED WIRING DIAGRAM 9 WIRING DIAGRAMS ...
Page 26: ...26 9 2 FUNCTIONAL FLOW WIRING DIAGRAM Alpha SY24 Wiring Diagrams ...
Page 28: ...28 10 3 FAULT FINDING SOLUTION SECTIONS A to F Alpha SY24 Fault Finding ...
Page 29: ...29 Alpha SY24 Fault Finding 10 4 FAULT FINDING SOLUTION SECTIONS G to J ...
