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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.
CAUTION
When venting this appliance, keep vent terminal free
of snow, ice and debris.
01/04
*2P0104*
All manuals and user guides at all-guides.com
Front
Flue Model
INSTALLATION
INSTRUCTIONS
OF23 SERIES UNITS
OIL UNITS
504,627M
38152A060
01/04
Supersedes 04/02
Table of Contents
General
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Shipping & Packing List
OF23 Unit Dimensions
OF23 Start−Up & Performance Check List
OF23 Unit Parts Arrangement
OF23 Oil AFII
Burner Parts Arrangement
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Requirements
Locate & Level Unit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Adjustments
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Venting
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Flue Connect ions
Supply & Return Air Plenums
Oil Supply Lines Sizing
Connect Oil Supply Line and Filter
Leak Check
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Wiring
Start−Up & Adjustment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting
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
OF23 oil furnaces. In Canada, refer to CSA B139 for rec-
ommended installation procedures. Consult authorities
who have jurisdiction before installation.
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 (front flue units only)
1− Direct intake collar (AFII burner units only)
Check the components for shipping damage. If you find any
damage, immediately contact the last carrier.
Page 1
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CAUTION
504,627M
*P504627M*
Litho U.S.A.
1
1
2
2
3
4
4
4
5
6
11
11
11
13
13
12
15
16
17
®
Series
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Related Manuals for Lennox OF23 Series
Summary of Contents for Lennox OF23 Series
- Page 1 Only qualified tech- WARNING ® nicians can install and service the Lennox Elite Series OF23 oil furnaces. In Canada, refer to CSA B139 for rec- Do not store or use gasoline or other flammable va- ommended installation procedures.
- Page 2 All manuals and user guides at all-guides.com OF23 Unit Dimensions − Inches (mm) (19) (19) 3-1/4 1-1/2 (83) TOP FLUE (38) OUTLET SUPPLY RETURN OPENING OPENING (19) (19) TOP VIEW FLUE CONNECTION OF23Q3/4-105/120R, OF23Q5-140/154R SIDE FLOW FLUE OUTLET OF23Q5−175/210R FLOW CENTERING HOLE (Field Fabricate Either Side)
- Page 3 All manuals and user guides at all-guides.com OF23 Unit Parts Arrangement flue opening filter clean-out port indoor blower limit switch control box with fan control board heat exchanger observation port clean−out BeckettR AFII Burner port (Shown) Figure 1 OF23 Oil AFII Burner Parts Arrangement FLANGE ELECTRONIC IGNITION PRIMARY...
- Page 4 Table 2 P.O. Box 799900 Installation Clearances Dallas, TX 75379−9900 All Unit Sizes Installation of Lennox oil−fired furnaces must conform with Clearances inches (mm) the National Fire Protection Association Standard for the Installation of Oil Burning Equipment, NFPA No. 31, the...
- Page 5 Strain on sides of cabinet the burner around in the vest panel area. causing cracking and popping noises may occur if OF23 Series Burner Removal weight of furnace is not evenly distributed. Next, rotate burner counter-...
- Page 6 All manuals and user guides at all-guides.com Prior to installation of unit, make a thorough inspection of the Beckett Oil Burner Nozzle Adjustment chimney to determine whether repairs are necessary. Make Burner must be removed from sure the chimney is properly constructed and sized accord- furnace for this procedure.
- Page 7 All manuals and user guides at all-guides.com 15− All vent pipe run through unconditioned areas or out- Front Flue / Masonry Chimne side shall be constructed of factory built chimney sec- barometric tions. See figure 7. control* liner (in either location) 16−...
- Page 8 All manuals and user guides at all-guides.com Combustion and Ventilation Air space. This space also includes adjacent rooms which are (Confined and Unconfined Spaces) not separated by a door. Though an area may appear to be unconfined, it might be necessary to bring in outdoor air for In the past, there was no problem in bringing in sufficient combustion if the structure does not provide enough air by amounts of outdoor air for combustion −−...
- Page 9 All manuals and user guides at all-guides.com Air from Outside Equipment In Confined Space If air from outside is brought in for combustion and ventila- All Air From Outside tion, the confined space shall be provided with two perma- nent openings. One opening shall be within 12" (305 mm) Chimney Or Oil of the top of the enclosure and one within 12"...
- Page 10 All manuals and user guides at all-guides.com To convert the AFII burner from confined space to outside 7− If improper venting is observed during any of the above tests, the common venting system must be cor- combustion air, remove the three screws which attach the rected.
- Page 11 All manuals and user guides at all-guides.com vent connector, plus 50% of the area of any additional flues Flue Connections or vent connectors. Install the barometric draft control (pro- vided) and flue pipe according to instructions packed with IMPORTANT control. Inspect flue pipe annually.
- Page 12 All manuals and user guides at all-guides.com Use continuous lengths of heavy wall copper tubing or Oil Piping steel pipe for oil supply pipe. Install oil supply pipe under One-Pipe System floor or near walls to protect it from damage. Avoid running air vent Î...
- Page 13 NOTE − An equipment ground screw is provided. Refer Locate filter close to burner for easy maintenance. Table 4 to unit wiring diagram and figure 16 for OF23 series lists the filters for the OF23 furnace. units. Ground unit using a suitable ground wire.
- Page 14 All manuals and user guides at all-guides.com Fan Control Board thermostat terminal strip Figure 16 Typical OF23 Wiring Diagram Figure 17 Page 14...
- Page 15 All manuals and user guides at all-guides.com Typical OF23 Wiring Diagram Figure 18 Page 15...
- Page 16 Turn unit on and check pressure and The following instructions are essential to the proper op- compare to table 3. Adjust if necessary. eration of OF23 series oil furnaces. To prevent sooting, B − Temperature Rise Adjustment these instructions must be followed in sequence: To measure temperature rise, place plenum thermometers 1 −...
- Page 17 7− Clean around burner, blower deck and vestibule area. 7 − Stack Temperature NOTE − A heat exchanger clean-out kit ABRSH380 Take a stack temperature reading in the vent pipe. Subtract (35K09) is available from Lennox. Page 17...
- Page 18 All manuals and user guides at all-guides.com Troubleshooting Burner failure or improper operation can result from a num- lowing troubleshooting charts list some failures, causes ber of different causes. and a sequence of steps to isolate the point of failure. Often the cause can be pinpointed by observing the differ- Check the simplest and most obvious items before prog- ent types of failure or by the process of elimination.
- Page 19 All manuals and user guides at all-guides.com Troubleshooting: Burner fails to start. Source Procedure Causes Correction Thermostat in OFF or COOL Switch to HEAT. Thermostat Check thermostat settings. Turn thermostat to higher tem- Thermostat is set too low perature. Burner motor overload tripped Push reset button pump motor.
- Page 20 All manuals and user guides at all-guides.com Troubleshooting: Burner starts, but no flame is established. Source Procedure Causes Correction Check tank gauge or use dip No oil in tank Fill tank. stick. Coat dip stick with litmus paste If water depth exceeds 1 inch, Oil Supply Water in oil tank and insert into bottom of tank.
- Page 21 All manuals and user guides at all-guides.com Troubleshooting: Burner starts and fires, but lock out on safety. Source Procedure Causes Correction Unbalanced fire Replace nozzle Reduce combustion air − check Too much air − −lean short fire If burner con- combustion.
- Page 22 All manuals and user guides at all-guides.com Troubleshooting: Burner starts and fires, but short cycles (too little heat) Source Procedure Causes Correction Heat anticipator set too low Correct heat anticipator setting. Vibration at thermostat Correct source of vibration. Thermostat Thermostat Check thermostat.
- Page 23 All manuals and user guides at all-guides.com Troubleshooting: Burner runs continuously (too little heat). Source Procedure Causes Correction Too much combustion air Reduce combustion air. Air leaks into heat exchanger Correct cause of air leak. around inspection door, etc. Low CO Low CO less less...
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