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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 upflow 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 /
downflow oil furnaces. The OF23 (Elite 80
) series units are
mid−efficiency loboy upflow 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
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
