750-204
Profire D/LND
1-5
1.8 — Oil System Air Atomizing
FIGURE 1-3. Dual Gas Manifold
1.8 — Oil System Air Atomizing
D Model burners use compressed air for atomization. Atomizing air is independent of combustion air. Either of
two air/oil systems are used, depending on burner size and fuel. ONe system uses an integral air compressor/oil
metering unit mounted on the burner and is driven by a separate motor. The other system is supplied with a sep-
arate compressor module for mounting near the burner.
1.8.1 — 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 ener-
gized, metered oil is directed to the nozzle through the N.C. port.
1.8.2 — Nozzle Assembly
The nozzle assembly consists of four main parts:
• Body
• Compression Spring
• Swirler
• Tip
The swirler is held against the nozzle tip by the compression spring.
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