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Instruction Manual – Model NX Oil Burner
Adjust, pipe, & wire burner
Mount burner on appliance
Mounting options
• Bolt the burner to the appliance using the factory-mounted flange or an
adjustable flange.
Mounting dimensions
• When using the Beckett universal adjustable flange, mount the air tube at
a 2° downward pitch unless otherwise specified by the appliance
manufacturer.
• Verify that the air tube installed on the burner provides the correct
insertion depth. See Figure 5.
• The end of the air tube should normally be ¼" back from the inside wall of
the combustion chamber. Never allow the leading edge of the retention
ring to extend into the chamber, unless otherwise specified by the heating
appliance manufacturer. Carefully measure the insertion depth when
using an adjustable flange. Verify the insertion depth when using a
welded flange.
Figure 5 – Mounting burner in appliance
Connect fuel lines
Carefully follow the fuel unit manufacturer's literature and the latest edition of
NFPA 31 for oil supply system specifications. If this information is unavailable,
use the following basic guidelines:
Fuel units with automatic bypass do not require a bypass plug.
NOTICE
The burner fuel unit is shipped without the bypass plug installed.
WARNING
You must install this plug on two-pipe oil systems. DO NOT install the plug in
the fuel unit if connected to a one-pipe oil system. Failure to comply could
cause fuel unit seal failure, oil leakage and potential fire and injury hazard.
Fuel supply level with or above burner –
The burner may be equipped with a single-stage fuel unit for these
installations. Connect the fuel supply to the burner with a single supply line if
you want a one-pipe system (making sure the bypass plug is NOT installed in
the fuel unit.) Manual bleeding of the fuel unit is required on initial start-up. If
connecting a two-pipe fuel supply, install the fuel unit bypass plug.
8
Connect fuel lines
WARNING
The oil supply inlet pressure to the fuel unit cannot exceed 3
psi. Install a pressure-limiting device in accordance with NFPA 31.
Fuel supply below the level of the burner –
When the fuel supply is below the level of the burner, a two-pipe fuel supply
system is required. Depending on the fuel line diameter and horizontal and
vertical length, the installation may also require a two-stage pump. Consult the
fuel unit manufacturer's literature for lift and vacuum capability.
Fuel line installation –
• Continuous lengths of heavy wall copper tubing are recommended.
Always use flare fittings. Never use compression fittings.
• Always install fittings in accessible locations. Fuel lines should not run
against the appliance or the ceiling joists (to avoid vibration noise).
Never use Teflon tape on any fuel fitting. Tape fragments can
WARNING
lodge in fuel line components and fuel unit, damaging the equipment and
preventing proper operation.
Fuel line valve and filter –
Install two high quality shutoff valves in accessible locations on the oil
•
supply line. Locate one close to the tank and the other close to the burner,
upstream of the filter.
NOTICE
Some states require these valves to be fusible-handle design
for protection in the event of fire. We recommend this as good industry
practice for all installations.
• Install a generous capacity filter inside the building between the fuel tank
shutoff valve and the burner, locating both the filter and the valve close to
the burner for ease of servicing. Filter should be rated for 50 microns or
less.
SK9668
Beckett
(continued)
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