Introduction
1-4
750-297
Profire E/LNE Series Manual
1.6 — Oil System Air Atomizing
E Model burners use compressed air for atomization. Atomizing air is independent of combustion air. The system is
supplied with a separate compressor module for mounting near the burner.
1.6.1 — 3-Way Solenoid Valve
Metered oil enters the common port of the 3-way solenoid valve. During shutdown, pre- and post-purge, the valve is
de-energized (N.C. port closed) and all metered fuel oil returns to the storage tank. When the valve is energized,
metered oil is directed to the nozzle through the N.C. port.
1.6.2 — Nozzle Assembly
The nozzle assembly consists of four main parts: body, compression spring, swirler, and tip. The swirler is held against
the nozzle tip by the compression spring. The nozzle body has inlet ports for air and oil lines. Metered fuel oil enters
the nozzle body and flows through a tube to the swirler. Oil is forced from the core of the swirler to the side ports where
it meets with the atomizing air. Atomizing air enters and passes through the nozzle body to grooves in the swirler,
where it mixes with fuel oil. Air/oil passes through grooves and out of the nozzle orifice in a cone of atomized oil.
Proper velocity and angle of the fine spray ensures good mixing with the combustion air, providing quiet starts and
excellent combustion efficiency. During pre- and post-purge, the nozzle tip is purged with air. This prevents afterdrip or
baked-on residue.
FIGURE 1-2. Nozzle Assembly
1.6.3 — Oil Strainer
Prevents foreign matter from entering the burner oil system.
1.6.4 — Atomizing Air Proving Switch
Pressure actuated switch contacts close when sufficient atomizing air pressure is present. The oil valve will not open
unless switch contacts are closed.
NOZZLE TIP
SWIRLER
SPRING
FUEL OIL
ATOMIZING AIR
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