Servicing and spares
45
Bosch Condens 5000W – 6 720 646 195 (2018/10)
6.8.7 Air/gas manifold and fan assembly
The following components require the air/gas manifold and fan assembly
to be removed:
▶ Fan electrode assembly
▶ Burner
▶ Heat exchanger
NOTICE:
CO/CO
2
checks
▶ If the joint between the air/gas manifold and heat exchanger is
disturbed the sealing gasket must be replaced.
After completing the service of the boiler, the CO/CO
2
must be
checked and set to the limits shown in Setting the air/gas ratio on
page 39.
▶ Remove electrical connector and earth wire the from fan.
▶ Remove wire clip from gas valve outlet then move gas pipe free from
the gas valve (see figure 85).
Refer to figure 87.
1. Undo the securing nut at the top of the heat exchanger and remove
the retaining plate assembly.
Fig. 87 Air/gas manifold retaining plate
Disconnect spark electrodes and flame sensor connection.
This will prevent damage to the electrodes and sensor when the air/gas
manifold is rotated.
Refer to figure 88.
1. Rotate fan and air/gas manifold assembly around the top of the heat
exchanger until the lug on the air/ gas manifold is visible.
▶ Lift up assembly and remove from boiler.
NOTICE:
After re-assembly
▶ Check the CO/CO2 levels as described in section 6.6 "Setting the
air/gas ratio".
2. Remove the cover panel by removing retaining screw.
Fig. 88 Rotate the air/gas manifold assembly
6.8.8 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.
Fig. 89 Air/gas manifold assembly dismantling
1.
6720643895-60.1Wo
6720643895-63.1Wo
1.
2.
4.
1.
2.
1.
3.
6.
5.
5.
5.
6720643895-81.1Wo
To Next Page
Loading...
