Replacing The Door Seal - Westinghouse WBCETNG750 Manual

Figure 33 - Setting the Torque Wrench
Figure 34 - Closing the Combustion Chamber Door
After the boiler has operated for 12 - 16 hours, the door will
have to be closed again to accommodate any burn-off of the
organic starch sealing rope. Retightening the door after 12 -
16 hours will ensure a proper seal.
NOTE: During initial start-up, the sealing rope may burn
off. During this period a burning smell may come from the
boiler. This is normal and will pass when the sealing rope has
completed burning off.
It is important to ensure that the combustion chamber door
is properly sealed and installed. Failure to do so could result
in a flue gas leak, property damage, severe personal injury,
or death.
C. Replacing the Door Seal
NOTE: BEFORE replacing the door seal, ensure the door is
completely and properly shut as described in this manual. An
improperly closed door could lead to exhaust leaks.
1. Make sure power is turned off to the boiler.
2. Turn off and remove any piping and electrical connections
connected to the combustion system cabinet (gas pipe line,
intake pipe, etc.) that could hinder opening the boiler door.
3. Before opening the door, ensure you have personal
protective equipment (PPE) in place. Wear an N95 certified
dust respirator, eye protection, and gloves. Spray down the
perimeter of the door to avoid the formation of dust during
the procedure.
Figure 35 - Personal Protective Equipment (PPE)
4. Use the handle to open the door. Open the door slowly to
avoid spreading of dust.
Figure 36 - Opening / Closing the Combustion Chamber Door
5. Gently remove the used seal. Take care not to damage the
door's ceramic insulation.
6. Carefully wash out the seal pit and rebead with new high
temperature silicon (rated to at least 300
Figure 37 - Removing the Combustion Chamber Door Seal
7. Replace the old seal with a new seal identical to the removed
one. The seal must be a little bit longer than the door diameter
in order to let the terminal sides remain compressed and ensure
a tight seal. Ensure the ends of the seal are covered with scotch
tape to prevent any fraying.
8. Place the new seal on the fresh silicon bead starting at the 5
o' clock position and insert it into the seal pit following the door
circumference.
Figure 38 - Installing the Combustion Chamber Door Seal
Figure 39 - Meeting the Taped Ends of the Seal
9. Close the door. Verify that the boiler plate presses exactly in
the middle of the seal. It may be necessary to readjust the door
joints due to the new seal's plasticity.
Figure 40 - Combustion Chamber Door With Installed Seal
61
o
C).
WHL-038 Rev. 1.29.16