Basics of Firetube Operation
1-2
750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
FIGURE 1-1. Firetube Boiler (cutaway view)
The LE (Low Emission) feature reduces nitrogen oxide (NO
X
) emissions, a major precursor to ozone pollution
(smog). Carbon monoxide (CO) emissions also tend to be lower, die to increased turbulence caused by the addition
of the flue gasses into the combustion air stream, thereby improving combustion.
The LE Option is used on Cleaver-Brooks Model CB firetube boilers firing either natural gas and/or light oil, and
is compatible with both hot water and steam systems.
Rated Capacity 250 through 350 hp
Operating Pressure Steam: 15 - 250 psig, or higher if specified
Hot Water: 30 - 250 psig, or higher if specified
Fuel Oil or Gas or Combination
Ignition Automatic
Firing Full Modulation Through Operating Ranges
Burner (Oil) (Low Pressure) Air Atomizing
Burner (Gas) Non-premix, Orificed Type
Air Damper Rotary Type (Electrically Modulated)
Steam Trim ASME Code
Water Trim ASME Code
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