Introduction
1-6
750-204
Profire D/LND
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 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 effi-
ciency. During pre- and post-purge, the nozzle tip is purged with air. This prevents afterdrip or baked-on residue.
FIGURE 1-4. Nozzle Assembly
1.8.3 — Burner Mounted Trim Heater
This provides heat for No. 4, 5, and 6 fuel oil and is located between the metering pump and the 3-way valve.
This heater should not be used as a continuous run line heater. The heater has an adjustable thermostat and a
cold oil lockout switch which prevents the burner from starting until proper atomizing temperature is attained.
1.8.4 — Oil Strainer
Prevents foreign matter from entering the burner oil system.
1.8.5 — 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.
1.8.6 — Air/Lube Oil Tank
Burner mounted tank stores compressed air for oil atomization and oil for compressor lubrication. Contains wire
mesh filter to separate lube oil from compressed air.
1.8.7 — Integral Air/Oil Unit
Model designation DL, DLG, DM, DMG No. 2 through No. 5 oil with air atomization (Model D42 to 145). These
models utilize an integral air compressor/oil metering unit which is separately driven at 1725 rpm and mounted
on the burner.
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