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Connect Fuel Lines
Oil Leak and Fire Hazard
Install the oil tank following applicable standards
in the U.S. by referring to the latest edition of NFPA
31 or CSA-B139 & CSA-B140 in Canada, and all
authorities having jurisdiction.
Do Not Use Tefl on Tape
Damage to the pump could cause impaired burner
operation, oil leakage and appliance soot-up.
Never use Tefl on tape on fuel oil fi ttings.
Tape fragments can lodge in fuel line components
and fuel unit, damaging the equipment and
preventing proper operation.
Use oil-resistant pipe sealant compounds.
To determine the proper fuel line size,
NOTICE
refer to the fuel pump manufacturer's
instructions provided with the burner. Refer to Figure 5
or Figure 6 for typical installation layouts.
The burner is supplied with either a one-stage pump
or a two-stage pump based on the oil supply system
requirements. Consult the instructions provided with the
pump for installation specifi cations.
When installing a one-pipe system, connect the inlet
line to the pump inlet. The fuel pump may be installed
with gravity feed or lift. The maximum allowable lift for a
single pipe installation is 8 ft.
When installing a two-pipe system, remove the 1/16"
pipe bypass plug from plastic bag attached to fuel unit.
Remove 1/4" plug from return port. Insert and tighten
the bypass plug. Attach return and inlet lines. The
return line should terminate approximately 3 to 4" above
supply line inlet. Failure to do this may introduce air into
the system and could result in loss of prime.
Fuel Line Installation
Route the fuel line through the opening in the bottom
of the burner cover. Continuous lengths of heavy wall
copper tubing are recommended. Always use fl are
fi ttings. Never use compression fi ttings.
Always install fi ttings in accessible locations. To avoid
vibration noise, fuel lines should not run against the
appliance or ceiling joists.
NX Burner Manual
Fuel Line Valves and Filter
Do Not Install By-pass Plug
with 1-Pipe System
Failure to comply could cause immediate pump seal
failure, pressurized oil leakage and the potential for a
fi re and injury hazard.
The burner is shipped without the by-pass plug installed.
Install the by-pass plug in two-pipe oil supply systems ONLY.
Oil Supply Pressure
Control Required
Damage to the fi lter or pump seals could cause oil
leakage and a fi re hazard.
The oil supply inlet pressure to the burner cannot
exceed 3 psig.
Insure that a pressure limiting device is installed in
accordance with the latest edition of NFPA 31.
Do NOT install valves in the return line.
Gravity Feed Systems: Always install an anti-siphon
valve in the oil supply line or a solenoid valve (RWB
Part # 2182602U) in the pump/nozzle discharge
tubing to provide backup oil fl ow cut-off protection.
Install two high quality, oil duty rated, fusible handle
design 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 fi lter for service
access.
Install a generous capacity fi lter inside the building
between the fuel tank shutoff valve and the burner,
locating both the fi lter and the valve close to the burner
for ease of servicing. Filter should be rated for 50
microns or less.
To further protect the fuel supply system and reduce
nozzle orifi ce plugging with fi ring rates below 0.75 gph,
a dual fi ltration system can be installed. This typically
consists of a 50 micron primary fi lter, located near the
fuel tank and a secondary fi lter rated for at least 10
microns located near the burner.
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.
Section: Prepare the Burner
9
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