OIL AND DUAL FUEL SYSTEMS
operator open (close for maintenance only)
16 osi (1 psi)
air
3D
5D
limiting orifice high fire ratio adj. (set first)
low fire ratio adjustment (set second)
16 osi
vent
not over 6" below burner (never above)
CL
oil 25 to 30 psi
about 10 psi plus spring setting
RATIOTROL and OIL BURNER
An air/oil Ratiotrol causes its oil outlet pressure (2nd column, below) to vary in proportion to the impulse or main air pressure. This automatically maintains a constant ratio of oil flow to air flow at all firing rates. The Ratiotrol spring can be adjusted to give added oil pressure and oil flow to match the atomizing air. The pressure (column 3) is constant.
Oil Outlet Pressure
Spring Total Outlet
Impulse
from Impulse
Setting
Pressure
16 osi
10 psi
2 psi
12 psi
8 4 0
5
2 2 2
7
2.5
4.5
0
2
If the combustion chamber has pressure or suction, connect the Ratiotrol's vent to the burner mounting by line (A). Use the pressure drop between supply line and combustion chamber to select Ratiotrol size and figure atomizing air pressure.
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