Basics of Firetube Operation
1-12
750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
1.6.5 — Fan/Motor Cassette
The fan and motor assemblies are designed as a cassette so that they can be removed from the front of the boiler
without opening the front door. The front door davit arm can be used to remove the assembly.
FIGURE 1-9. Fan/Motor Cassette
1.6.6 — Burner Drawer
The spudding pattern for the IFGR system may be different than that of a non-IFGR, High-Turndown CB Burner
of the same horsepower (HP) model designation.
1.6.7 — Combustion Air Inlet
The combustion air inlets are located at the top of the front door. Air enters from the rear of the air inlet shrouds,
which reduces the sound level and captures heat from the boiler and stack flue outlet.
1.6.8 — Front Door Insulation
If NO
X
emissions are below 60 ppm, the front door is insulated inside to control temperature build up. The insula-
tion is held in place with wire mesh.
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