Air Pressure Switch; Fan - Bosch Worcester Greenstar Ri ErP + Series Installation And Maintenance Instructions Manual

▶ Undo the securing nut at the top of the heat exchanger and remove the
retaining plate assembly (1).
Disconnect spark electrodes and flame sensor
connection.
This will prevent damage to the electrodes and sensor
when the air/gas manifold is rotated.
1. Rotate fan and air/gas manifold assembly (1.) around the top of the
heat exchanger until the lug on the air/gas manifold is visible.
▶ Lift up assembly and remove from appliance.
1.
Fig. 75 Rotate the air/gas manifold assembly
NOTICE: After re-assembly, check the CO/CO
described in section 7.6 Setting the air/gas ratio.

7.8.8 AIR PRESSURE SWITCH

NOTICE: Pressure switch
▶ Ensure that the tube is reconnected to the pressure
switch
1. Remove the electrical connections.
2. Slacken the top retaining screw and remove the bottom screw.
3. Disconnect the tube.
4. Remove the Air pressure switch assembly
2.
4.
3.
Fig. 76 Air pressure switch
6 720 821 670 (2018/06)
6720804530-16.1Wo
levels as
2
1.
1. Remove the two screws retaining the pressure switch to the bracket.
2. Refit the new Air pressure switch to the bracket.
2.
Fig. 77 Air pressure switch bracket
NOTICE: After re-assembly, check the CO/CO
described in section 7.6 Setting the air/gas ratio.

7.8.9 FAN

▶ Remove the air/gas manifold from the appliance as described in the
previous section.
1. Remove two screws retaining the fan to the air/gas manifold.
2. Remove the air/gas manifold.
3. Remove the screw holding the retaining plate.
4. Remove the retaining plate.
5. Remove three screws and the mixing chamber.
Re-assemble with new fan ensuring seals are correctly fitted.
3.
5.
5.
6.
5.
Fig. 78 Dismantling the air/gas manifold assembly
SERVICE AND SPARES
1.
levels as
2
2.
1.
1.
4.
6720643895-81.1Wo
53