Servicing and spares
Bosch Condens 5000W – 6 720 646 195 (2018/10)
46
▶ Re-assemble with new fan ensuring seals are correctly fitted.
Flap valve assembly
There is no need to remove the mounting flange from the fan assembly
just to gain access to the flap.
▶ Twist the mixing chamber clockwise to release from the mounting
flange.
▶ Pull the mixing chamber off the mounting flange.
1. Pull the rubber flap off the flap valve assembly.
Fig. 90 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.
▶ Push the mixing chamber back onto the mounting flange and twist
anti-clockwise to secure.
6.8.9 Electrode assembly and burner
▶ Disconnect spark electrodes and flame sensor connection.
▶ Remove clamping plate.
Refer to figure 91.
1. Remove spark/flame electrode assembly from heat exchanger.
2. Remove the seal from the top of the heat exchanger.
3. Remove the burner.
Fig. 91 Electrode assembly and burner
▶ Replace new burner in correct position.
▶ Ensure that burner tabs, as shown in figure 91, fit correctly their
respective locations.
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.
▶ Ensure that the new seal is fitted.
CAUTION:
Clamping plate
▶ Ensure that the clamping plate is firmly tightened down on top of the
heat exchanger.
▶ Replace the clamping plate.
1.
6720646195-22.1Wo
1.
2.
3.
6720643895-61.1Wo
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