BOSCH SSB255 SSB Gas-Fired Condensing Boiler Instruction Manual
- June 3, 2024
- Bosch
Table of Contents
BOSCH SSB255 SSB Gas-Fired Condensing Boiler Instruction Manual
Please read this entire document prior to proceeding with any work.
When replacing the fl ue pipe on an installed boiler follow the steps below before proceeding with replacement procedure:
- Shutoff and or isolate the external power supply.
- Shutoff and disconnect the gas supply pipe.
- Shutoff and disconnect the boiler’s supply and return piping.
- Drain water from the boiler then remove the tridicator gage, PRV and blow off piping.
- Remove the exhaust and combustion air pipes along with the vent adapter.
- Reverse steps after installing the stainless steel vent pipe and check system of for leaks.
WARNING:
♦ This bulletin is intended to provide technical guidance to a professional who is licensed and qualified to work on boiler products and components. If you are not qualified to work on such equipment, please obtain the services of such a professional.
WARNING: HAZARDOUS VOLTAGE
♦ Turn off or disconnect power to the boiler before proceeding with any work.
Background
These instructions will assist the installer in removing the boiler’s existing plastic fl ue pipe and replacing it with the stainless steel fl ue pipe component (see table below for part numbers).
Table 1
- This flue pipe is supplied in two pieces, which fit together when installed.
Removal of Existing Plastic Flue Pipe
7. Rotate the lock at the top on the front panel and remove the front panel as shown (fig.1).
Figure 1
8. Remove the power supply connectors (white, black, and green wires) from the main power switch (fi g.2).
Figure 2
9. Remove the flue gas probe from the existing plastic flue pipe (fi g.3).
2 | SSB Stainless Steel Flue Pipe – Retrofit Installation Procedure Technical Service Bulletin
Figure 3
10. Unscrew the two screws that are located on the right and left sides under the boiler’s top-front panel, and remove the panel (fi g. 4 & 5).
Figure 4
Figure 5
11. Remove the Tridicator gauge (fig. 6).
Figure 6
12. Remove the black plug from the system supply connector (fig.7).
Figure 7
13. Unscrew the four screws located on top of the top-rear panel (fig.8).
Figure 8
Technical Service Bulletin SSB Stainless Steel Flue Pipe – Retrofit Installation Procedure | 3
14. Disconnect the flexible gray pipe from the plastic air intake collar, and remove the top-rear panel (fi g.9 & 10).
Figure 9
Figure 10
15. Disconnect the existing plastic flue pipe from the condensate collector (fig.11).
Figure 11
16. Remove the existing plastic flue pipe by pulling it up through the top of the boiler (fig.12).
Figure 12
Installation of New Stainless Steel Flue Pipe
-
Insert the new stainless steel flue pipe down through the top of the boiler (fig.13).
Figure 13 -
Connect the flue pipe into the condensate collector (fig.14).
Fully and carefully insert the male end of the pipe into the female end.
Be sure gasket stays in groove/position while inserting.
Figure 14 -
Reinstall the top-rear panel. Reconnect the flexible gray pipe to the air intake and tighten clamp (fig.15).
Figure 15 -
Connect the new stainless steel flue pipe to the plastic exhaust collar (fig.16).
Figure 16 -
Tighten down the top-rear panel’s four screws (fig.17).
Figure 17 -
Reinstall the top-front panel and tighten the two screws (fi g.18 & 19).
Figure 18
Figure 19 -
Install the flue gas probe into the new stainless steel pipe (fig. 20).
Figure 20 -
Reconnect the power and ground wires to the switch (fig.21).
Figure 21 -
Using Loctite 542, reinstall the Tridicator gauge (fig.22).
Figure 22 -
Reinstall the black plug (fig.23).
Figure 23 -
Close the boiler’s front panel. If boiler was installed, reconnect the boiler’s electric power and gas supply, pressurize the boiler’s internal water and reconnect existing venting. Test run the boiler to check for flue gas leaks or condensation leaks.
a. If no leaks are present, the work is complete.
b. If leaks are present, check the connections and reseat and/or tighten where needed. Run the boiler and again check for leaks.
Bosch Thermotechnology Corp.
65 Grove Street
Watertown, MA 02472
Tel: 1-866-642-3198
Fax: 1-603-965-7581
www.bosch-thermotechnology.us