Lennox O23 User Manual

Page 1
 1995 Lennox Industries Inc.
Litho U.S.A.
Corp. 9535−L8
O23/OHR23
OF23
Service Literature
Revised 09/2003
O23 / OHR23 / OF23 SERIES UNITS
O23 (Elite 80) series units are mid−efficiency upflow oil fur
naces manufactured with Beckett oil burners. O23 units are
available in heating capacities of 70,000 to 154,000 Btuh
(20.5 to 45.1 kW) and cooling applications from 2 through 5
tons (7.0 through 17.6 kW). Refer to Engineering Hand
book for proper sizing.
OHR23 (Elite 80) series units are mid−efficiency horizontal /
downflow oil furnaces. The OF23 (Elite 80) series units are
mid−efficiency loboy upflow oil furnaces, which come in front
(OF23) or rear (OF23R) flue openings, both with Beckett oil
burners. The OHR23 and OF23(R) units are available in heat
ing capacities of 105,000 to 154,000 Btuh (30.8 to 45.1 kW)
and cooling applications from 2 through 5 tons (7.0 through
17.6 kW). Refer to Engineering Handbook for proper siz
ing.
The drum type heat exchanger comes with strategically
placed ports allowing easy cleaning, while the oil burner
can be removed for inspection and service. The mainte
nance section gives a detailed description on how this is
done.
Information contained in this manual is intended for use by
experienced HVAC service technicians only. All specifica
tions are subject to change. Procedures outlined in this
manual are presented as a recommendation only and do
not supersede or replace local or state codes.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon
nect switch(es). Unit may have multiple
power supplies.
WARNING
Improper installation, adjustment, alteration, ser
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and service
must be performed by a qualified installer or service
agency.
O23 SHOWN
TABLE OF CONTENTS
General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indoor Blower Data 4. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangement 5. . . . . . . . . . . . . . . . . . . . . . . . . . . .
I Unit Components 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II Placement and Installation 16. . . . . . . . . . . . . . . . . . . .
III Start Up 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV Heating Systems Service Checks 22. . . . . . . . . . . . .
V Disassembling Burner 24. . . . . . . . . . . . . . . . . . . . . . . .
VI Typical Operating Characteristics 26. . . . . . . . . . . . . .
VII Maintenance 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VIII Wiring Diagrams 28. . . . . . . . . . . . . . . . . . . . . . . . . .
IX Troubleshooting 31. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lennox O23 Specifications

General

Brand	Lennox
Model	O23
Category	Furnace
Language	English

Summary

Unit Overview and Specifications

Series Units Overview

Introduces the O23, OHR23, and OF23 series oil furnaces and their key features.

Series Specifications

Detailed technical specifications for O23, OHR23, and OF23 series units.

Blower Performance Data

Air volume performance data for O23, OHR23, and OF23 series units at various speeds.

Unit Components and Installation

Unit Components and Parts Orientation

Identifies key components and provides parts orientation diagrams for the units.

-1 Through -4 Unit Oil Burner Parts Arrangement

Exploded views of the oil burner assembly for -1 to -4 units.

-5 Unit Oil Burner Parts Arrangement

Exploded views of the oil burner assembly for -5 units.

Installation Guidelines

Covers unit placement, oil piping, venting, and combustion air requirements.

Operation, Service, and Maintenance

Start-Up Procedures

Steps for initial unit start-up, including safety checks and heating start.

Service Checks and Disassembly

Procedures for heating system checks, component disassembly, and typical operation.

Maintenance Procedures

Routine maintenance tasks including filters, heat exchanger, burner, and electrical checks.

Wiring Diagrams and Troubleshooting

Wiring Diagrams and Operation Sequences

Electrical schematics and operational sequences for unit functions.

Troubleshooting Common Issues

Identifies common problems and provides solutions for venting, controls, and burner operation.

Troubleshooting Flowcharts and Guides

Diagnostic flowcharts and guides for blower control and unit operation issues.