Installation
2-6
750-204
Profire D/LND
the blast tube, but piping to the compressor and tank is essentially similar. Copper tubing for the installation is
not supplied with the burner.
FIGURE 2-5. Separate Compressor Module
2.6 — Typical Oil Supply Loop
Refer to Figure 2-6. Continuous oil circulation must be supplied to the burner at a rate of 50% greater than the
high fire burning rate. The oil circulating pump should be located as close as possible to the storage tank to keep
suction lines short and minimize suction loss. Pipe line sizes indicated on the following oil piping schematics are
of ample size to reduce pressure losses. If heating of the fuel oil is required, the lines must be large enough to
prevent restriction of flow through any cold spots in the system. Note that the supply line is approximately 20
inches or higher above the burner metering pump inlet to help eliminate air problems. Above that is an adjust-
able, spring-loaded back pressure valve that sets approximately 10 to 15 PSI on the circulating loop. The return
line to the tank is connected at the discharge port of the back pressure valve. Since air rises to the highest point,
it will rise from the supply entrance and pass through the back pressure valve to the return line and on to the
tank. Metered oil is pumped (by the metering pump) to the common port of a 3-way valve. With the 3-way valve
de-energized, the metered oil returns to the tank through the back pressure valve and return line. When the 3-
way valve is energized, metered oil is passed on to the burner oil nozzle and atomized by air from the compres-
sor. The proper strainers, check valves, vacuum and pressure gauges, etc. should be installed as indicated. All
lines should be pressure tested after installation.
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