750-368
CBEX Elite 100-1200 HP
1-7
1.6 — IFGR Components
1.5.4 — Safety Valve(s)
Relieves the boiler of pressure higher than the design pressure or a lower pressure, if designated. Relief valves
and their discharge piping are to be installed to conform to ASME Code requirements.
1.6 — IFGR Components
1. Flue Gas Transfer Port, IFGR Damper, Flange Collar: The flue gas transfer port is a tube that allows the flue
gases to travel from the exit of the second-pass tubes to the entrance of the combustion air fan.
The IFGR damper controls the volume of flue gas induced into the combustion air stream. The damper is
located in the flue gas transfer port and is positioned by the control linkage.
2. 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.
3. 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.
4. 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.
1.7 — 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 (100-200 HP have
a hinged front door and a davit specifically for blower use). When removing the cassette use the lifting lugs pro-
vided (3-point rigging recommended for 350-1200 HP).
FIGURE 1-6. Fan/Motor Cassette
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