Control Valves; Differential Pressure Control Valve; Circulating Pump - Bosch Worcester Greenstar HIU E Installation And Maintenance Instructions Manual

8.3

Control valves

Refer to figure 64
▶ Ensure the appliance is fully drained.
▶ Disconnect the electrical connection/s [2] from the appropriate
control valve/s [1] (heating or hot water).
▶ Undo the connection pipes [3].
▶ To refit, follow the above in reverse. Ensure any seals that have been
disturbed are renewed.
1
2
3
Fig. 64 Control valve/s removal
8.4

Differential pressure control valve

Refer to figure 65
▶ Ensure the appliance is fully drained.
▶ Undo the sensing tube connection [3].
▶ Undo the connection pipes [1] and remove the differential pressure
control valve and pipe work [2].
1
Fig. 65 Differential pressure control valve assembly removal
6 720 808 928 (2017/06)
Refer to figure 66
▶ Undo the connection pipes [5] and remove the differential pressure
control valve [4] from the upper and lower pipe work.
▶ Undo the sensing tube connection [6] on the differential pressure
control valve [4].
▶ To refit, follow the above in reverse. Ensure any seals that have been
disturbed are renewed.
2
1
3
6720808926-29.1Wo
Fig. 66 Differential pressure control valve removal
8.5
Refer to figure 67
▶ Ensure the appliance is fully drained.
▶ Disconnect the electrical connection from the circulating pump [1].
– Use a flat bladed screwdriver to aid releasing the securing clip.
1
▶ Undo the connection pipes [2].
▶ Remove the circulating pump [1].
▶ To refit, follow the above in reverse. Ensure any seals that have been
disturbed are renewed.
2
3
1
Fig. 67 Circulating pump removal
4
6

Circulating pump

1
Replacement of parts
5
2
55