Bosch ZBR28-3A - Burner Servicing; Heat Exchanger Block Inspection and Cleaning

84 | Inspection and maintenance
Copyright (optional information)6 720 643 068 (2011/06)
14.1.5 Burner servicing
B Remove burner lid (steps 1 - 4).
Fig. 84 Removing the burner cover
B Remove burner and clean its components.
Fig. 85 Burner
B Reinstall burner in reverse order, including a new gasket
if necessary.
B Adjust the gas-air ratio (Æ page 76).
14.1.6 Heat exchanger block inspection and cleaning
B Remove the inspection cover (Æ page 12) and any
sheet metal insert below, if installed.
B Determine degree of soiling of the heat exchanger
through visual inspection.
If mechanical cleaning is required:
For cleaning the heat exchanger, Bosch offers the service
accessory kit which includes main heat exchanger gaskets,
the heat exchanger brush and heat exchanger cleaning
blade (part-# 7719001998).
B Remove the condensate trap (steps 1 and 2) and place
a suitable container underneath.
Fig. 86 Removing the condensate trap
DANGER: Fire danger!
B Only operate the burner while installed in a
boiler.
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NOTICE: Damage to the coating of the heat
exchanger.
B Cleaning of the heat exchanger should not
be necessary until five years after the initial
commissioning.
B Only use a Bosch cleaning blade and Bosch
cleaning brush (Æ page 114).
B Only clean heat exchanger in case if soiling
is clearly visible.
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