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VIIFuelPiping
Two basic piping systems are used to connect the boiler to the oil supply:
1) One-Pipe – Recommended where the fuel pump is below the lowest possible level of the oil in
the tank. Basic piping is shown in Figure 21a.
2) Two-Pipe – Recommended where the fuel pump is above the lowest possible level of the oil in
the tank. This system is self-priming. Basic piping is shown in Figure 21b.
Consult the instructions supplied with the pump for limitations on lift, horizontal run, and required line
sizes. Pumps supplied with the ODV boiler generally require the installation of a bypass plug when
converted for use in a two-pipe system. See the pump instructions for specic information. Also note the
following:
1) If the boiler is being installed as a replacement, the existing oil system may be two-pipe even
though the pump is below the lowest level in the oil tank. Such systems should be converted
to one-pipe systems as doing so will result in warmer oil temperatures, lower vacuums, and
longer lter life.
IMPORTANT
• Installation of oil storage tanks, ll pipes, and oil lines must conform to local code
requirements. In the absence of any codes, installation must be in conformance
with ANSI/NFPA-31.
• Use of this boiler with an unenclosed above ground outdoor oil tank is not
recommended.