27
8.23 DIVERTER VALVE ASSEMBLY - Fig. 26
1.
Drain the boiler heating circuit as described in section 8.2.
2.
Remove the diverter valve motor as described in section
8.14.
3.
Remove the two 4 mm allen screws and pull the plastic
housing from the manifold.
4.
Fit the new valve assembly in reverse order using new
seals.
5.
Refill and pressurise the system. (Refer to
Commissioning, section 5.1).
8.24 HEATING RETURN FILTER - Refer to Fig. 13
1.
Drain the boiler heating circuit as described in section 8.2.
2.
Disconnect the by-pass valve unions and remove the
valve. Withdraw the filter from the return.
3.
Clean or replace and re-assemble in reverse order.
8.25 HEATING PRESSURE RELIEF VALVE - Refer to Fig. 2
1.
Drain the boiler heating circuit as described in section 8.2.
2.
Disconnect the relief valve outlet fitting. Undo the screw securing the relief valve and pull out the valve.
3.
Re-assemble in reverse order using a new 'O' ring seal.
4.
Refill and pressurise the system. (Refer to Commissioning, section 5.1).
8.26 HEATING EXPANSION VESSEL - Refer to Fig. 2
1.
Drain the boiler heating circuit as described in section 8.2.
2.
Disconnect the pipe from the expansion vessel and remove the re-usable support strap (see Fig. 19) by inserting a small
screwdriver into the clip on the strap.
3.
Remove the nut and washers securing the vessel to the hot water storage cylinder and lift the vessel out of the boiler.
4.
Re-assemble in reverse order using a new seal.
5.
Refill and pressurise the system. (Refer to Commissioning, section 5.1).
8.27 DHW EXPANSION VESSEL - Refer to Fig. 12
1.
Close the mains water supply valve and ensure that all hot water taps are closed. Release the pressure from the hot water circuit.
2.
Disconnect the expansion vessel union and remove the re-usable support strap (see Fig. 19) by inserting a small
screwdriver into the clip on the strap.
3.
Remove the expansion vessel.
4.
Re-assemble in reverse order. Refill and pressurise the hot water circuit by opening the mains water supply valve.
8.28 PRIMARY PRESSURE SWITCH - Refer to Fig. 25
1.
Drain the boiler heating circuit as described in section 8.2.
2.
Disconnect the wiring from the pressure switch.
3.
Remove the switch by unscrewing it from the manifold.
4.
Re-assemble in reverse order using the new washer supplied.
5.
Refill and pressurise the system.
8.29 DHW TEMPERATURE/PRESSURE RELIEF VALVE - Refer to Fig. 2
1.
Partially drain the hot water circuit, so that the water in the hot water storage cylinder is below the relief valve connection, as
described in section 8.2.
2.
Remove the valve from the storage cylinder.
3.
Re-assemble in reverse order.
4.
Refill the storage cylinder by opening the mains water supply valve and opening a hot water tap.
Fig. 26
Alpha CB50 - Component Replacement
Diverter valve
manifold
4 mm Allen screws
Diverter valve motor
Cover
screws
Diverter valve
housing
Motor securing
screws
Summary of Contents for Alpha CB50 Boiler
Page 29: ...29 9 WIRING DIAGRAMS 9 1 ILLUSTRATED WIRING DIAGRAM Alpha CB50 Wiring Diagrams ...
Page 30: ...30 9 2 FUNCTIONAL FLOW WIRING DIAGRAM Alpha CB50 Wiring Diagrams ...
Page 32: ...32 Alpha CB50 Fault Finding 10 3 DOMESTIC HOT WATER Follow operational sequence ...
Page 33: ...33 Alpha CB50 Fault Finding 10 4 FAULT FINDING SOLUTIONS A to F ...
Page 34: ...34 Alpha CB50 Fault Finding 10 5 FAULT FINDING SOLUTION SECTIONS G to L ...
