Technical data

27
Primary return
sensor
Cable
clamps
Automatic
air vent
Pump
Primary flow sensor Diverter valve
Differential water
flow switch
Fig. 29
Overheat thermostatHot water storage sensor
Complete pump
1. Unscrew the automatic air vent from the pump outlet.
2. Disconnect the pump unions and withdraw the pump, remove the wiring cover and disconnect the wiring.
3. Connect the wiring as described above, ensure that pump is set to maximum and re-assemble using new sealing washers.
4. Refill and pressurise the system. (Refer to Commissioning, section 5.1).
8.28 DIVERTER VALVE ASSEMBLY - Fig. 30
1. Drain the boiler heating circuit as described in section 8.2.
2. Remove the bottom casing panel as described in section 8.1,
paragraph 4.
3. Remove the diverter valve motor as described in section 8.20.
4. Release the pipework retaining plate screws and rotate the
plates to allow the pipe connections to be withdrawn.
5. Withdraw the pipes from the valve and remove the diverter
valve body.
6. Re-assemble in reverse order using the new seals supplied.
7. Refill and pressurise the system. (Refer to Commissioning,
section 5.1).
8.29 HEATING RETURN FILTER - Refer to Fig. 13
1. Drain the boiler heating circuit as described in section 8.2.
2. Unscrew the heating return filter end cap fitting and withdraw the filter.
3. Clean or replace and re-assemble in reverse order.
8.30 HEATING PRESSURE RELIEF VALVE - Refer to Fig. 2
1. Drain the boiler heating circuit as described in section 8.2.
2. Disconnect the union connecting the valve to the primary flow pipe.
3. Re-assemble in reverse order using the new washers supplied.
4. Refill and pressurise the system. (Refer to Commissioning, section 5.1).
8.31 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.
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 the new seal supplied.
5. Refill and pressurise the system. (Refer to Commissioning, section 5.1).
Motor cover
securing screw
Retaining
plate
Plate
securing
screws
Motor assembly
securing screws
Connections
for wiring
Fig. 30
Alpha 500E - Component Replacement