vaporized at this point by radiant heat from above. The
vapors rise and mix with the air drawn through the
perforated holes in the burner. During high fire
conditions, the flame burns above the top combustion
ring, as shown in figure 4-8; and under low fire
conditions, the flame burns in the lower portion or pilot
ring of the burner, as shown in figure 4-9.
The PERFORATED SLEEVE BURNER consists
of a metal base formed of two or more circular fuel
vaporizing grooves and alternate air channels (fig.
4-10). Several pairs of perforated sleeves or cylinders
force the air through the perforations into the oil vapor
chamber. In this way a large number of jets of air are
introduced into the oil vapor, bringing about a good
mixture. This mixture burns with a blue flame and is
clean and odorless.
These burners usually have a short kindling wick.
Some burners have a cup below the base in which
alcohol is burned to provide heat for starting. The wick
and alcohol are used only for lighting.
Figure 4-8.High fire flame.
Oil-burning heaters are portable and are easily
moved from one location to another. For satisfactory
operation, follow the installation procedures supplied
by the manufacturer. In both pot type and perforated
sleeve burners, oil is fed to the burner under control of
a float-operated metering valve (fig. 4-11). Set the unit
level so the oil can be properly distributed in the
Figure 4-10.Perforated sleeve burner.
Figure 4-9.Low fire flame.
Figure 4-11.Oil-controlled metering valve.