Lennox International Inc. o23v - Manual (Page 11)

Page 11
II−PLACEMENT AND INSTALLATION
Make sure unit is installed in accordance with installation in-
structions and applicable codes.
A−Piping
The piping system and it’s components (oil filter, safety valves,
shut-off valves, etc.) must be designed to provide clean, air
free fuel to the burner.
An oil filter is required for all models. Use an oil filter of gener-
ous capacity for all installations. Install filter inside the building
between the tank shut−off valve and the burner. Locate filter
close to burner for easy servicing. The GAR−Ber 11BV−R or
equivalent filter (with the below specifications) is recom-
mended.
Maximum Firing Rate: 10GPH (38LPH)
Micron Removal: 10
Filtering Area: 500 in. 2 (3225.8 cm 2 )
Working Pressure: 15 PSI (103.4 kPa)
Inlet/Outlet Dimension: 3/8" (9.5 mm) NPT
Flow Rate: 45GPH (171LPH)
Care must be taken to ensure the restriction of the piping sys-
tem, plus any lift involved, does not exceed the capabili-
ty of the oil pump. Each installation will be different. Use
the following guidelines when determining to use a single or
two stage pump.
When using a single−pipe system with the fuel supply level
with or above the burner (see figure 5) and a vacuum of 6"
(152 mm) Hg or below, a single stage fuel unit with a supply
line and no return line should be adequate. Manual bleeding of
the fuel unit is required on initial start up. Failure to bleed air
from the pump could result in an air lock/oil starvation condi-
tion.
NOTE−As an extra precaution, cycle heating on and off
ten times after bleeding air from the pump. This will elim-
inate air in the gun assembly.
When using a two pipe system with the fuel supply level
below the level of the burner (see figure 6) a single stage
fuel unit should be used in lift conditions of up to 10 feet
(3 m) and/or a vacuum of 10" (254 mm) Hg or below. A
two stage fuel unit should be used when lift exceeds 10
feet (3 m) and/or a vacuum of 10" (254 mm) Hg to 15" (381
mm) Hg. Both conditions require the use of a return line that
purges the fuel unit of air by returning it to the fuel tank. Use
table 8 when determining the run and lift for piping.
Before converting a one-pipe system to a two-pipe sys-
tem the pump must be converted to a two-pipe system.
To convert the pump, install the bypass plug according
to the instructions. Notice in the two-pipe system the re-
turn line must terminate 3" (76 mm) to 4" (102 mm)
above the supply inlet. Failure to do this may introduce
air into the system and could result in loss of prime.
NOTE−If using an outside tank in cold climates a number one
fuel or an oil treatment is strongly recommended.
FIGURE 5
OIL PIPING
ОООООООООООО
ОООООООООООО
ОООООООООООО
ОООООООООООО
ОООООООООООО
ОООООООООООО
ОООООООООООО
ОООООООООООО
ОООООООООООО
ОООООООООООО
ОООООООООООО
Air Vent
Fill
Pipe
Oil
Tank
Fuel
Unit
Aux
Filter
Shut−off
Valve
8 ft (2.4 m)
Maximum
One Pipe Lift
ONE-PIPE SYSTEM
FIGURE 6
OIL PIPING
ООООООООООООО
ООООООООООООО
ООООООООООООО
ООООООООООООО
ООООООООООООО
Fuel
Unit
Aux
Filter
Return
Line
Fill
Pipe
Air Vent
Oil
Tank
Inlet
Return
Line
H
3"−4"
(76mm −102mm)
R
OUTSIDE TANK FUEL UNIT ABOVE BOTTOM OF TANK.
TWO-PIPE SYSTEM
TABLE 8
TWO−PIPE MAXIMUM LINE LENGTH (H + R)
3450 RPM − 3 GPH (11.4 LPH)
Lift H"
Figure 5
3/8" (10 mm) OD
Tubing
1/2" (12 mm) OD
Tubing g
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)