Installer’s Guide
19
- Adjusting the fuel pump pressure
- Setting the draft control
NOTICE: This oil furnace must be installed and ad-
justed by qualified oil heating dealers using calibrated
combustion test instruments to ensure safe and reli-
able operation of the furnace.
FUEL SYSTEM INSTALLATION
In situations where the oil storage tank is installed
at the same level with, or above, the burner, a single
oil supply line run from the oil tank to the burner will
usually be adequate. No return line will be required. If
the oil tank is installed below the burner and the lift
exceeds approximately 8-ft., an oil supply line and an
oil return line are necessary. See Figure 14 and 15.
Refer to the Standard for the Installation of Oil-Burn
-
ing Equipment, NFPA 31-2001, and the oil burner op-
erating instructions for detailed information on oil
storage tank & oil supply/ return line installation.
NOTICE: We recommend installing a high efficien-
cy oil filter, in the oil supply line, capable of filter-
ing 10 to 20 micron diameter (or preferably small-
er) particles from the fuel.
If available, the use of ultra-low or low sulfur (less
than 0.0015% S and 0.0015 - 0.05% S, by weight,
respectively), no. 2 fuel oil is highly recommend
-
ed. Low sulfur fuel oil can help to significantly reduce
instances of blockage and corrosion of the oil burner
fuel delivery system (especially the nozzle), the furnace
heat exchanger, and the flue gas venting system. Air
pollutants emitted by the furnace and the typical mal
-
odorous smell of oil combustion will be reduced.
Connect fuel lines
Carefully follow the fuel unit manufacturer’s literature
and the latest edition of NFPA 31 for oil supply system
specifications.
Fuel units with automatic bypass do not require a by
-
pass plug. The burner fuel unit is shipped without the
bypass plug installed. You must install this plug on
two-pipe oil systems.
DO NOT install the bypass plug in the fuel unit if con-
nected 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 is factory equipped with a single-stage
fuel unit. 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 venting of the fuel unit is required on initial
start-up. If connecting a two-pipe fuel supply, install
the fuel unit bypass plug.
The oil supply inlet pressure to the fuel unit cannot
exceed 3 psi. Install a pressure-limiting device in
accordance with NFPA 31. Example: Burner is
at same level or below the level of the oil tank.
WARNING
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. See
Figure 15. Depending on the fuel line diameter and
horizontal and vertical length, the installation may
also require a two-stage pump. Consult the fuel unit
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 ttings 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 lodge in fuel line components and fuel
unit, damaging the equipment and preventing proper
operation. WARNING
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.
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.
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