Air Pressure Switch; Fan - Bosch WORCESTER GREENSTAR Ri ErP Series Installation, Commissioning And Servicing Instructions

SERVICE AND SPARES

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
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.
44
1.
1.
levels as
2

7.8.9 FAN

▶ Remove the air/gas manifold from the boiler 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
FLAP VALVE ASSEMBLY
1. Twist the mounting flange clockwise to release.
2. Pull mounting flange off the flap valve assembly.
3. Pull rubber flap off flap valve assembly.
▶ To replace the flap valve:
– Press the two lugs on the back of the flap into the two slots in the
flap valve assembly.
Fig. 79 Flap valve assembly
Greenstar Ri
2.
1.
1.
4.
6720643895-81.1Wo
3.
2.
1.
6720643895-117.1Wo
ErP - 6 720 813 283 (2016/07)