Page 12
Figure 14
Oil Piping
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air vent
fill
pipe
Oil
Tank
fuel
pump
Aux
Filter
Shut−off
Valve
8 ft (2.4 m)
Maximum
One Pipe Lift
One-Pipe System
Table 2
One−Pipe Oil Sizing
Line Length
Pipe Diameter (OD Tubing)
0−50’ (15 m)
3/8" (10 mm)
51−100’ (15 m)
1/2" (12 mm)
Two−Pipe System
When using a two−pipe system with the oil tank below the
level of the burner, a single−stage fuel pump should be used
in lift conditions of up to 10 feet (3 m) and/or a vacuum of
10" (254 mm) Hg or less. See figure 15. Use a two−stage
fuel pump when lift exceeds 10 feet (3 m) and/or a vacuum
of 10" (254 mm) Hg to 15" (381 mm) Hg.
Both conditions require that you use of a two−pipe system,
which consists of a return line that purges the fuel pump of
air by returning it to the tank. To determine the run and lift for
piping, refer to table 3 .
Figure 15
Oil Piping
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fuel
pump
Aux
Filter
Return
pipe
Fill
Pipe
Air Vent
Oil
Tank
Inlet
Return
pipe
H
3"−4"
(76 mm −102 mm)
R
outside tank fuel pump above bottom of tank
Two-pipe System
Use continuous lengths of heavy wall copper tubing or
steel pipe for oil supply pipe. Install oil supply pipe under
floor or near walls to protect it from damage. Avoid running
pipes along joists or reverberating surfaces. Always use
flare fittings. All fittings must be accessible. Do not use
compression fittings.
IMPORTANT
Both oil supply and return pipes must be submerged
in oil in the supply tank.
Table 3
Two−Pipe Maximum Pipe Length (H + R)
3450 RPM − 3 GPH (11.4 LPH)
Lift H"
3/8" (10 mm) OD
Tubing
1/2" (12 mm) OD
Tubing
Single
Stage
Two
Stage
Single
Stage
Two
Stage
0’
(0.0 m)
84’
(25.6 m)
93’
(28.3 m)
100’
(30.5 m)
100’
(30.5 m)
2’
(0.6 m)
73’
(22.3 m)
85’
(25.9 m)
100’
(30.5 m)
100’
(30.5 m)
4’
(1.2m)
63’
(19.2 m)
77’
(23.5 m)
100’
(30.5 m)
100’
(30.5 m)
6’
(1.8m)
52’
(15.8 m)
69’
(21.0 m)
100’
(30.5 m)
100’
(30.5 m)
8’
(2.4m)
42’
(12.8 m)
60’
(18.3 m)
100’
(30.5 m)
100’
(30.5 m)
10’
(3.0m)
31’
(9.4 m)
52’
(15.9 m)
100’
(30.5 m)
100’
(30.5 m)
12’
(3.7m)
21’
(6.4 m)
44’
(13.4 m)
83’
(25.3 m)
100’
(30.5 m)
14’
(4.3m)
−−−
36’
(11.0 m)
41’
(12.5 m)
100’
(30.5 m)
16’
(4.9m)
−−−
27’
(8.2 m)
−−−
100’
(30.5 m)
18’
(5.5m)
−−−
−−−
−−−
76’
(23.2 m)
Oil Supply Line & Filter Connections
One−Pipe Systems
CAUTION
Do not install the bypass plug into the pump on one−
pipe systems.
The burner is shipped with fuel pump set for one−pipe op-
eration. For one−pipe systems, the oil supply pipe is con-
nected to the inlet tap on the pump. A one−pipe system
should only be used where there is gravity oil flow to the
pump and the pipe is not run at any point above the oil level
in the tank.
