9
Weil-McLain Ultra Oil NX
Burner Manual
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 head assembly
to extend into the chamber, unless otherwise
speci
fi
ed by the heating appliance manufacturer.
Carefully measure the insertion depth when using
an adjustable
fl
ange. Verify the insertion depth
when using a welded
fl
ange.
Installing the Oil Tank and Supply System
3.
Note:
to determine the proper fuel line size, refer to
the fuel pump manufacturer’s instructions provided
with the burner. Refer to Figure 5 or Figure 6 for typical
installation layouts.
Fuel Line Valves and Filter
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.
Fuel supply level with or above burner
Figure 5. – Inside Tank Gravity Feed System
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.
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.
Never use Te
fl
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.
y
y
y
Damage to the pump could cause impaired burner
operation, oil leakage and appliance soot-up.
Do Not Use Tefl on Tape
The burner is shipped without the by-pass plug installed.
Install the by-pass plug in two-pipe oil supply systems ONLY.
y
y
Failure to comply could cause immediate pump seal
failure, pressurized oil leakage and the potential for a
fi re and injury hazard.
Do Not Install By-pass Plug
with 1-Pipe System
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 anit-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.
y
y
y
y
Damage to the fi lter or pump seals could cause oil
leakage and a fi re hazard.
Oil Supply Pressure
Control Required
Section: Inspect/Prepare Installation SIte
Summary of Contents for UO-3 CV
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