Manual

10
Fuel Unit By-pass Plug
Oil Supply/Return Lines
Table 3 - Fuel Unit Gearset Capacities
Fuel Unit
Model Number
Gearset Capacity
(Gallons Per Hour)
B2TA8245 21
Install the oil tank and oil lines in accordance with all
applicable state and local codes.
Size the oil supply and return lines using the
guidelines given in the fuel unit literature included in
the literature envelope. Oil line fl ow 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 fl ow rate.
Use continuous lengths of heavy-wall copper tubing,
routed under the fl oor where possible. Do not attach
fuel lines to the appliance or to fl oor joists if possible.
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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.
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Install Oil Supply To
Specifications
Failure to properly install the oil supply
system could cause oil leakage,
equipment malfunction,
puff-back of hot gases, heavy smoke,
asphyxiation, explosion and fi re hazards.
Carefully install the oil supply lines, fi ttings and
components using the guidelines provided in this
section.
The oil supply must comply with the latest edition
of NFPA 31 (Canada CSA B139) and all applicable
codes.
Do NOT install valves in the return line.
If the oil supply inlet pressure to the pump exceeds 3
psig or for gravity feed systems, install an oil safety
or pressure reducing valve (Webster OSV, Suntec
PRV or equivalent).
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Section: Mount the Burner
300 psig
300 psig
Figure 10 - Two-pipe Oil Flow with “B” Pump
Figure 9 - One-pipe Oil Flow with “B” Pump
300 psig
300 psig
This will reduce vibration and noise transmission
problems.
Install an oil fi lter sized to handle the fuel unit gear
set fl ow capacity (Table 3) for two-pipe systems.
Size the fi lter for the fi ring rate for one-pipe
systems. Locate the fi lter immediately adjacent to
the burner fuel unit.
Install two high-quality shut-off valves in accessible
locations on the oil supply line. Locate one valve
close to the tank. Locate the other valve close to the
burner, upstream of the fuel fi lter.
Burner Fuel Flow
One-pipe systems – See Figure 9 for the fuel fl ow
path.
- Oil supply connects to one of the fuel unit inlet
ports.
Two-pipe systems – See Figure 10 for the fuel fl ow
paths for two-pipe oil systems.
- Oil supply connects to one of the fuel unit inlet
ports. Oil return connects to the fuel unit return
port. Do NOT install valves in the return line.
(Install the by-pass plug in the fuel unit for
two-pipe systems.)
Nozzle pressure – The fuel unit nozzle port
pressure is factory set at 300 psig. Some original
equipment manufacturer burner applications may
call for a lower pressure to obtain a required fi ring
rate. Do not change this pressure unless directed to
do so by the appliance manufacturer.
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Legend (Figures 9 & 10)
a Return port
b Nozzle port
c Oil valve
d Nozzle & adapter
g Inlet port
k Return line to oil tank
p Air bleed valve