Firetube Operation Basics
1-10
750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
5. Burner Drawer: The gas 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.
6. 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 out-
let.
7. Front Door Insulation: If NOx emissions are below 60 ppm, the front door is insulated inside to control tem-
perature buildup. The insulation is held in place with wire mesh.
8. 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 1-13. Fan/Motor Cassette
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