Weil-McLain QB-180 Manual page 10

QB-180/300 Oil Burners Series 2 — Burner Manual
3
Fuel pumps and oil lines
Two-pipe oil systems (Figure 7)
Use two-pipe installations when fuel must be lifted
greater than 8 feet.
Burner fuel pump
to a fuel lift height of no more than 10 feet. For greater
lifts install a two-stage pump on the burner.
Fuel suction line vacuum
for a single-stage pump or 17" for a two-stage pump.
Bypass plug must be used
Remove plug from plastic bag attached to fuel pump.
Remove ¼" plug from return port. Insert bypass plug.
Attach return and inlet lines.
Always terminate return line as shown in
To determine two-pipe maximum line lengths, use
page 10.
Table 2,
Table 2
Note: Line lengths include total of vertical and horizontal lengths.
10
— A single-stage pump is limited
must not exceed 12" Hg
with two-pipe installations.
Two pipe oil system maximum oil line lengths (feet)
Single-stage oil pump
Lift
"L"
3/8" O.D.
0 84
2 73
4 63
6 52
8 42
10 31
12
14
Not recommended
— use two-stage pump
16
18
continued
Figure 7
Return line
L
(lift)
.
Figure 7
06507
1/2" O.D.
100
100
100
100
100
100
Two-pipe oil system, typical
Fuel pump
Fill
pipe
Filter
Oil
tank
Return line terminates
3 to 4 inches above inlet line
Two-stage oil pump
3/8" O.D. 1/2" O.D.
93 100
85 100
77 100
69 100
60 100
52 100
44 100
36 100
27 93
-- 65
Part number 644-500-065/0200