504,626M
*P504626M*
01/04
*2P0104*
Page 1
E
2002 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
Do not store or use gasoline or other flammable va-
pors and liquids in the vicinity of this or any other ap-
pliance.
WARNING
Improper installation, adjustment, alteration, ser-
vice, or maintenance can cause injury or property
damage. Refer to this manual. For assistance or
additional information, consult a qualified installer
or service agency.
INSTALLATION
INSTRUCTIONS
O23 SERIES UNITS
OIL UNITS
504,626M
38152A059
01/04
Supersedes 04/02
Table of Contents
General
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping & Packing
1
. . . . . . . . . . . . . . . . . . . . . . . . . .
Requirements
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O23 Unit Dimensions
2
. . . . . . . . . . . . . . . . . . . . . . . . . . .
O23 Start−Up & Performance Check List
2
. . . . . . . . .
O23 Unit Parts Arrangement
3
. . . . . . . . . . . . . . . . . . . . .
O23 Oil
Burner Parts Arrangement
3
. . . . . . . . . . . . . . . .
Locate & Level the Unit
5
. . . . . . . . . . . . . . . . . . . . . . . .
Setting the Unit
5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Adjustments
5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Venting
6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flue Connections
10
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply & Return Air Plenums
11
. . . . . . . . . . . . . . . . .
Oil Supply Line & Filter Connections
12
. . . . . . . . . . .
Leak Check
13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Wiring
13
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Start-Up & Adjustments
15
. . . . . . . . . . . . . . . . . .
Service
16
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting
17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CAUTION
When venting this appliance, keep vent terminal free
of snow, ice and debris.
General
These instructions are intended as a general guide and do
not supersede local codes in any way. Only qualified tech-
nicians can install and service the Lennox Elite
®
Series
O23 oil furnaces. In Canada, refer to CSA B139 for recom-
mended installation procedures. Consult authorities who
have jurisdiction before installation.
CAUTION
Never burn garbage or paper in the heating system.
Never leave papers near or around the unit.
Shipping & Packing List
1− Assembled oil furnace
1− Barometric draft control
1− Side exhaust pipe collar
1− Direct intake collar (AFII burner units only)
Check the components for shipping damage. If you find any
damage, immediately contact the last carrier.
Litho U.S.A.
