Page 11
To determine the correct tubing size for piping, refer to table 3.
Table 3
One−Pipe Oil Line 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, use a single−stage fuel pump in lift con-
ditions of up to 10 feet (3 m) and/or a vacuum of 10" (254
mm) Hg or less. See figure 13. Use a two−stage fuel pump
when lift exceeds 10 feet (3 m) and/or a vacuum of 12" Hg
to 17" 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 4.
Figure 13
Oil Piping
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎ
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 4
Two−Pipe Maximum Pipe Length (H + R)
Lift H"
3450 RPM − 3 GPH (11.4 LPH)
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’
(1.2 m)
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’
(2.4 m)
42’
(12.8 m)
60’
(18.3 m)
100’
(30.5 m)
100’
(30.5 m)
10’
(3.0 m)
31’
(9.4 m)
52’
(15.9 m)
100’
(30.5 m)
100’
(30.5 m)
12’
(3.7 m)
21’
(6.4 m)
44’
(13.4 m)
83’
(25.3 m)
100’
(30.5 m)
14’
(4.3 m)
−−−
36’
(11.0 m)
41’
(12.5 m)
100’
(30.5 m)
16’
(4.9 m)
−−−
27’
(8.2 m)
−−−
100’
(30.5 m)
18’
(5.5 m)
−−−
−−−
−−−
76’
(23.2 m)
Table 5
Fuel Pump Usage
Pump
Piping Application
Maximum Lift (vacuum)
Single−Stage Pump
One−Pipe System
8 ft. (6" Hg vacuum)
Two−Pipe System
10 ft. (12" Hg vacuum)
Two−Stage Pump
Two−Pipe System
10 ft. or greater
(12" to 17" Hg vacuum)
