750-96 (revised 2010)
Model CB Packaged Boiler Manual
7-19
7.16 — Refractory
The area between the burner housing and the throat tile requires a good seal. An improper or poor seal allows air
leaks that can cause overheating and burning of the burner housing metal. this area should be inspected at fre-
quent intervals.
When installing the housing, or the tile against the housing, liberally coat this surface with refractory cement.
Remove any cement that is squeezed out so that it does not cover the gas holes in the housing.
Allow the refractory to air dry as long as possible. If immediate use is required, fire intermittently at low rate for
several hours to thoroughly dry the refractory.
For detailed information, request Bulletin C10-5921.
7.16.3 — Rear Door
The rear door is a steel shell containing horizontal baffle tiles and lined with insulation material and castable refrac-
tory.
FIGURE 7-9. Rear Door Open
Burned or discolored paint on the outer surface of the door does not necessarily indicate refractory trouble, but
may be an indication of other conditions, such as:
• Leaking gaskets.
• Improper seal.
• Door retaining bolts insufficiently or unevenly tightened.
• The air line to the rear sight tube may be blocked or loose.
• Repainted with other than heat resistant paint.
Therefore, before assuming the refractory requires reworking:
• Check condition of tadpole gasket and rope seal.
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