06/04 504,628M
*2P0604* *P504628M*
Page 1
®
2004 Lennox Industries Inc.
Dallas, Texas, USA
WARNING
This product contain fiberglass wool.
Disturbing the insulation during installation, main-
tenance, or repair will expose you to fiberglass wool
dust. Breathing this may cause lung cancer. (Fiber-
glass wool is known to the State of California to
cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact
your supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379−9900
INSTALLATION
INSTRUCTIONS
OHR23 Series Units
OIL UNITS
504,628M
38152A061
06/04
Supersedes 4/02
Table of Contents
Elite Series Oil Furnace 1. . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OHR23 Unit Parts Arrangement 3. . . . . . . . . . . . . . . . . . .
Oil Burner Parts Arrangement 3. . . . . . . . . . . . . . . . . . . . .
Requirements 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply & Return Air Plenums 5. . . . . . . . . . . . . . . . . . . . .
Optional Filter Kit 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Initial Unit Adjustments 6. . . . . . . . . . . . . . . . . . . . . . . . . .
Venting 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combustion and Ventilation Air 8. . . . . . . . . . . . . . . . . . . .
Flue Connections 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Supply Lines Sizing 12. . . . . . . . . . . . . . . . . . . . . . . . .
Oil Supply Line & Filter Connections 13. . . . . . . . . . . . . .
Leak Check 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Wiring 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Start−Up & Adjustments 15. . . . . . . . . . . . . . . . . . . . .
Service 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start−Up & Performance Checklist 17. . . . . . . . . . . . . . . .
Troubleshooting 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
Elite
®
Series Oil Furnace
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
OHR23 oil furnaces. In Canada, refer to CSA B139 for rec-
ommended installation procedures. Consult authorities
who have jurisdiction before installation.
WARNING
Improper installation, adjustment, alteration, ser-
vice or maintenance can cause personal injury, loss
of life, or damage to property.
Installation and service must be performed by a
qualified installer or service agency.
Shipping & Packing List
1− Assembled oil furnace
1− Draft control
Check the components for shipping damage. If you find
any damage, immediately contact the last carrier.
CAUTION
Never burn garbage or paper in the heating system.
Never leave papers near or around the unit.
Do not store or use gasoline or other flammable va-
pors and liquids in the vicinity of this or any other
appliance.
When venting this appliance, keep vent terminal
free of snow, ice and debris.
Litho U.S.A.
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