28
8.32 DIFFERENTIAL WATER FLOW SWITCH - Refer to Fig. 29
1.
Drain the boiler heating circuit as described in section 8.2.
2.
Disconnect the flow switch unions and remove the switch.
3.
Remove the screws securing the plastic cover and disconnect the wiring from the microswitch.
4.
Re-assemble in reverse order using the new seals supplied.
5.
Refill and pressurise the system. (Refer to Commissioning, section 5.1).
8.33 DHW TEMPERATURE/PRESSURE RELIEF VALVE - Refer to Fig. 2
1.
Partially drain the hot water circuit, as described in section 8.2, so that the water in the hot water storage cylinder is below the
relief valve connection.
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.
8.34 DHW STORAGE CYLINDER
1.
Drain the boiler heating and hot water circuits as described in section 8.2.
2.
Remove the heating expansion vessel as described in section 8.31.
3.
Remove the DHW temperature/pressure relief valve as described in section 8.33.
4.
Remove the storage temperature sensor as described in section 8.25.
5.
Release the strapping securing the insulation to the cylinder and remove the two screws (on the left hand side) securing
the top front support bar.
6.
Remove the front section of the cylinder insulation.
7.
Disconnect all the pipework from the cylinder.
8.
Remove the cylinder retaining screw, positioned beneath the cylinder on the backplate.
9.
Lift the cylinder upwards to disengage it from the top of the boiler's backplate. Pull the cylinder forward and out of the boiler.
10. Re-assemble in reverse order using the new seals supplied.
11. Refill and pressurise the heating and hot water circuits. (Refer to Commissioning, section 5.1).
8.35 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. Release the clamping band securing it to the mounting bracket.
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.
8.36 PRESSURE REDUCING VALVE FILTER/CARTRIDGE - 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.
Unscrew the cartridge from the valve body.
3.
Clean or replace the filter/cartridge and re-assemble in reverse order.
4.
Refill and pressurise the hot water circuit by opening the mains water supply valve.
8.37 EXPANSION RELIEF VALVE CHECK VALVE - 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 valve pipework unions and remove the valve
3.
Re-assemble in reverse order. Refill and pressurise the hot water circuit by opening the mains water supply valve.
8.38 EXPANSION RELIEF VALVE CARTRIDGE - 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.
Unscrew the cartridge from the valve body.
3.
Clean or replace the cartridge and re-assemble in reverse order.
4.
Refill and pressurise the hot water circuit by opening the mains water supply valve.
Alpha 500E - Component Replacement
