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Bosch SSB255 Technical Service Bulletin

Refractory replacement procedure
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Technical Service Bulletin:
Heat Exchanger: Refractory Replacement Procedure
Models: SSB255, SSB399, SSB512
WARNING:
The operations described here-below must be performed by
qualified personnel.
WARNING:
Before replacing the refractory, disconnect the equipment
from the power supply with the main ON/OFF switch and
close the manual gas shutoff valve.
CAUTION:
During every maintenance operation, always replace the
gaskets, especially the burner gaskets.
Replacement Procedure
Please follow the following steps for the refractory replacement:
1.
Disconnect the two electrical connectors from the fan as shown in Fig.1
Electrical connectors
Figure 1
2.
After closing the gas valve, disconnect the gas hose fi tting as shown in
Fig.2.
Data subject to change without notice | Printed in the USA | BTC 438002102 B | 08.2019
Figure 2
3. Disassemble the fan by unscrewing the 4 nuts that lock the fl ange to the burner
head as shown in Fig. 3.
Figure 3
4.
Pull the fan upwards as shown in Fig. 4.
Fig. 2
Fan Flange
Figure 4
Gas hose fitting
Bosch Thermotechnology Corp.

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  Summary of Contents for Bosch SSB255

  • Page 1 Technical Service Bulletin: Heat Exchanger: Refractory Replacement Procedure Models: SSB255, SSB399, SSB512 WARNING:  The operations described here-below must be performed by qualified personnel. WARNING:  Before replacing the refractory, disconnect the equipment from the power supply with the main ON/OFF switch and Gas hose fitting close the manual gas shutoff valve.
  • Page 2 After removing the burner, continue as follows: Unscrew the nuts that lock the burner fl ange as shown in Fig. 8. Figure 11 Figure 8 Data subject to change without notice | Printed in the USA | BTC 438002102 B | 08.2019 Bosch Thermotechnology Corp.
  • Page 3 Figure 17 11. Place the fi ber disc on the disc holder of the combustion chamber as shown in Fig. 15. Data subject to change without notice | Printed in the USA | BTC 438002102 B | 08.2019 Bosch Thermotechnology Corp.
  • Page 4 Fig. 20. 19. Re-assemble all components, and check all gaskets (burner / o-ring fl ange gaskets). Bosch Thermotechnology Corp. 65 Grove Street Figure 20 Watertown, MA 02472 Tel: 1-866-642-3198 Fax: 1-954-776-5529 www.boschheatingandcooling.com...

This manual is also suitable for:

Ssb399Ssb512