8Form 6104 BCF5-R0301
Instruction Manual – Model CF500/CF800 Oil Burner
Connect fuel line(s)Install the oil lines using the following
guidelines. Failure to comply could lead to
equipment damage and present a risk of severe
personal injury, death or substantial property
damage due to leakage of oil and potential
fire hazard.
Use only flare fittings at joints and
connections. Never use compression fittings.
Install fittings only in accessible locations to
assure any leak will be detected.
Where joint sealing is needed, use only pipe
dope. Never use Teflon tape. Tape strands can
break free and damage the fuel unit.
Never use a one-pipe oil system with a lift in
excess of 8 feet with B fuel unit. On two-pipe
oil systems, verify that the suction line
vacuum does not exceed the fuel unit
manufacturer’s recommendation.
The fuel unit is shipped without the by-pass
plug installed for CF500/CF800 ON/OFF
burners. You must install this plug on two-
pipe systems. DO NOT install the by-pass 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 unit by-pass plug
• The CF500/CF800 burner is shipped without the by-pass
plug installed in the fuel unit.
• The by-pass plug must not be installed in the fuel unit for
one-pipe oil systems.
• You must install the by-pass plug if using on a two-pipe
oil system.
❏ Oil supply/return lines
• Install the oil tank and oil lines in accordance with all
applicable codes.
• Size the oil supply and return lines using the guidelines
given in the fuel unit literature included in the literature
envelope. Oil line flow rate will equal the burner rate for
one-pipe systems. For two-pipe systems, refer to Table 3
for the fuel unit gearset capacity - the rate at which fuel is
recirculated when connected to a two-pipe system. Size
two-pipe oil lines based on this flow rate.
• Use continuous lengths of heavy-wall copper tubing,
routed under the floor where possible. Do not attach fuel
lines to the appliance or to floor joists if possible. This will
reduce vibration and noise transmission problems.
• Install an oil filter sized to handle the fuel unit gearset flow
capacity (Table 3) for two-pipe systems. Size the filter for
the firing rate for one-pipe systems. Locate the filter imme-
diately adjacent to the burner fuel unit.
• Install two high-quality shut-off valves in accessible loca-
tions on the oil supply line. Locate one valve close to the
tank. Locate the other valve close to the burner, upstream
of the fuel filter.