Chapter 1 — Basics of Firetube Operation
Part No. 750-184 1-3
The general information in this manual applies directly to Cleaver-
Brooks Model CB/CB-LE Boilers in sizes ranging from 125 through
200 boiler horsepower for the following fuels:*
Series 100 Light Oil (No. 2)
Series 200 Light Oil (No. 2) Or Gas
Series 400 Heavy Oil (No. 6) Or Gas
Series 600 Heavy Oil (No. 6) Only
Series 700 Gas Only
*For additional information on Model CB Ohio Special boilers 125-225 HP, see
Section G at the end of this chapter.
Although the Series 400 or 600 burner is designed and designated
to burn No. 6 oil, the burner will handle grades 4 and 5 equally well,
with some possible adjustments. While the manual contains
pertinent information on No. 6 fuel oil, all references to No. 6 fuel
should be considered applicable to all grades of heavy oil.
The LE option reduces Nitrogen Oxide (NOx) emissions, a major
precursor to ozone pollution (smog). Carbon Monoxide (CO)
emissions also tend to be lower, due to increased turbulence caused
by the addition of the flue gases into the combustion air stream,
thereby improving combustion.
For information on IFGR when firing heavy oil, review the Operation
and Maintenance manual for Heavy Oil Isolation 750-171
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: 125
through 200hp
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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