Lennox International Inc O23V2-90 Ii Tanki, 111SUTOFFI Maximam, Iiii, o Oo 8 o o o o o o

Oil Piping - One-Pipe System

--FILL PIPE

--AIR VENT

_o_1	II TANKI		v_l	8ft(2.4m)
ol II		111S"UT'OFFI "Maximam
	IL		VALVE	I One Pipe Lift

Oil	Piping -Two-Pipe		System
AIR VENT
			FUEL PUMP
FILL PIPE	"'',_ R		/	AUX
	-IIII	RETURN	m/	.FILTER
_II	I	PIPE _	_	INLET

- -. --

	(76ram'102mm) I
.... F_iF_E 14	R

outside tank fuel pump above bottom of tank.

_o Oo °°8° _o °o °o_o °o o_

Figure 15

To determine the correct tubing size for piping, refer to table 3

	Table 3
	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 (see figure 16) with the oil tank below the level of the burner, use a single-stage fuel pump in lift conditions of up to 10 feet (3 m) and/or a vacu- um of 10" (254 mm) Hg or less. 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 table4

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.

Figure 16

IMPORTANT

Table 4

Two-PipeMaximum Pipe Length (H + R)

3450 RPM - 3 GPH (11.4 LPH)

		Single-		Two-		Single-			Two-
		Stage		Stage		Stage			Stage
Lift "H"		3/8" (10 mm) OD				1/2" (12 mm) OD
ft (m)		Tubing - ft (m)				Tubing
0' (0.0)		84	(25.6)	93	(28.3)	100		(30.5)	100	(30.5)
2' (0.6)		73	(22.3)	85	(25.9)	100		(30.5)	100	(30.5)
4' (1.2)		63	(19.2)	77	(23.5)	100		(30.5)	100	(30.5)
6	'(1.8)	52	(15.8)	69	(21.0)	100		(30.5)	100	(30.5)
8' (2.4)		42	(12.8)	60	(18.3)	100		(30.5)	100	(30.5)
10'(3.0)		31	(9.4)	52	(15.9)	100		(30.5)	100	(30.5)
12'(3.7)		21	(6.4)	44	(13.4)	83	(25.3)		100	(30.5)
14'(4.3)		---		36	(11.0)	41	(12.5)		100	(30.5)
16'(4.9)		---		27	(8.2)	---			100	(30.5)
18'(5.5)		.........							76 (23.2)

Page 11

O23V SERIES