Bosch Installation Manual

Inspection and maintenance
Greenstar – 6721822579 (2021/01)
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15.1.6 Heat exchanger block inspection and cleaning
NOTICE
Damage to the coating of the heat exchanger.
▶ Cleaning of the heat exchanger should not be necessary until five
years after the initial commissioning.
▶ Only use a Bosch cleaning blade and Bosch cleaning brush.
▶ Only clean heat exchanger when visibly dirty.
▶ Remove the inspection cover ( page 10) and any sheet metal
insert below, if installed.
▶ Determine degree of soiling of the heat exchanger through visual
inspection.
If mechanical cleaning is required:
To clean of the heat exchanger, use Bosch burner gaskets, cleaning brush
kit and cleaning blade, all of which are available as spare parts.
▶ Remove the condensate trap (steps 1 and 2) and place a suitable
container underneath.
Fig. 93 Removing the condensate trap
▶ With the cleaning blade, clean the heat exchanger block from the
bottom to the top.
Fig. 94 Cleaning the heat exchanger with the cleaning blade
▶ Clean the heat exchanger block with the brush from top to bottom.
Fig. 95 Cleaning the heat exchanger with the cleaning brush
▶ Remove burner ( Chapter 15.1.5 “Burner servicing”).
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