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E 2002 Lennox Industries Inc.
Dallas, Texas, USA
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
OHR23 oil furnaces. In Canada, refer to CSA B139 for rec-
ommended 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− Draft control
Check the components for shipping damage. If you find any
damage, immediately contact the last carrier.
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.
06/04
*2P0604*
®
®
Series
INSTALLATION
INSTRUCTIONS
OHR23 SERIES UNITS
OIL UNITS
504,628M
38152A061
06/04
Supersedes 4/02
Table of Contents
General
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Unit Dimensions
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Initial Set−Up of Unit
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RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
Do not store or use gasoline or other flammable va-
pors and liquids in the vicinity of this or any other ap-
pliance.
When venting this appliance, keep vent terminal free
of snow, ice and debris.
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CAUTION
CAUTION
504,626M
*P504626M*
Litho U.S.A.
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Related Manuals for Lennox OHR23 Series
Summary of Contents for Lennox OHR23 Series
-
Page 1: Table Of Contents
......... ® nicians can install and service the Lennox Elite Series Flue Connections . - Page 2 OHR23 Unit Dimensions − Inches (mm) (1346) Model No. 4 KNOCKOUTS 20 1/2 20 1/2 10 1/4 14-1/2 (For Suspending) OHR23Q3 105/120 OHR23Q3 105/120 (368) 457 457 457 457 3-1/2 FLOW 23 1/2 23 1/2 4 3/4 11 3/8 (89) OHR23Q5 140/154 OHR23Q5 140/154 533 533 533 533...
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Page 3: Ohr23 Unit Parts Arrangement
OHR23 Unit Parts Arrangement CLEAN−OUT PORT FLUE OPENING HEAT EXCHANGER BECKETTR AFII BURNER INDOOR BLOWER CLEAN−OUT PORT CONTROL BOX WITH FAN CONTROL BOARD Figure 1 OHR23 Oil Burner Parts Arrangement FLANGE ELECTRONIC IGNITION PRIMARY AIR TUBE GASKET SCREWS TRANSFORMER IGNITOR CONTROL FLANGE REAR ACCESS... -
Page 4: Requirements
1 (25) Dallas, TX 75379−9900 inet Front of Cabinet 24 (610) Installation of Lennox oil−fired furnaces must conform with Service Clearance (Front) 24 (610) the National Fire Protection Association Standard for the Installation of Oil Burning Equipment, NFPA No. 31, the... -
Page 5: Installation
1− Rotate the furnace so that return is on top and supply is on bottom. Refer to table 3 for clearances to combus- OHR23 series units may be installed in a crawl space under tible flooring. a house, utility room or in a wide variety of suspended ap- plications. -
Page 6: Optional Filter Kit
Optional Filter Kit AIR DUCT (Not Furnished An Optional filter kit is available for OHR23 units. Kit 35K05 by Lennox) is used with OHR23−105/120 units, and kit 35K06 is used OPENING with OHR23−140/154 units. All kits include the following: FILTER... - Page 7 Unit Adjustments OHR23 Series Burner Removal Loosen three nuts which at Rotate burner counterclockwise on Neither the nozzle setting nor the air adjustments are factory tach burner to vest panel. slots then pull toward you. set. The furnace is fire−tested and the limit control is checked to make sure it functions properly;...
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Page 8: Venting
8 − The vent may pass through a wall where provisions have Venting been made for a thimble as specified in the Standards of the National Board of Fire Underwriters. See figure 7. WARNING The barometric damper shall be in the same atmo- Wall Thimble spheric pressure zone as the combustion air inlet to the furnace. - Page 9 13− The vent pipe shall not be connected to a chimney In the absence of local codes concerning air for combus- tion and ventilation, the following section outlines guide- vent serving a solid fuel appliance or any mechanical lines and recommends procedures for operating oil fur- draft system.
- Page 10 or at the return air duct connection can cause a potentially Equipment In Confined Space dangerous negative pressure condition. Air for combustion All Air From Outsid (Inlet Air from Crawl Space and and ventilation can be brought into the confined space ei- Outlet Air to Ventilated Attic) ther from inside the building or from outside.
- Page 11 When ducts are used, they shall be of the same cross−sec- Equipment In Confined Space tional area as the free area of the openings to which they All Air From Outside connect. The minimum dimension of rectangular air ducts shall be no less than 3" (76 mm). In calculating free area, CHIMNEY the blocking effect of louvers, grilles, or screens must be OR OIL...
- Page 12 Direct Connection of Outdoor Air for Combustion 6− After it has been determined that each appliance re- maining connected to the common venting system The Beckett AFII burner was designed to allow for direct air properly vents when tested as outlined above, return intake piping (4"...
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Page 13: Flue Connections
Flue Connections Radiation Shield Installation COMBUSTIBLE MATERIAL É É É OHR23 UNIT 1" (25mm) IMPORTANT (TOP) É É É RADIATION É É É When flue pipe is installed at less than minimum SHIELDS UNIT CABINET clearance listed in tables 2 and 3, radiation shields É... - Page 14 One−Pipe System Oil Piping Two-Pipe System When using a one−pipe system with the oil tank even above fuel Air Vent Fill pump the burner and a vacuum of 6" (152 mm) Hg or less, a single− Pipe stage fuel pump with a supply line and no return line should be Filter adequate.
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Page 15: Oil Supply Line & Filter Connections
NOTE − An equipment ground screw is provided. Refer 4 − The return pipe must terminate 3" to 4" above the sup- to unit wiring diagram and figure 18 for OHR23 series ply pipe inlet. See figure 17. units. Ground unit using a suitable ground wire. - Page 16 Fan Control Board thermostat terminal strip Figure 18 Typical OHR23 Wiring Diagram Figure 19 Page 16...
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Page 17: Unit Start−Up & Adjustments
5− If burner fails to light again, refer to the troubleshooting Unit Start−Up & Adjustments section in this manual. Before starting unit, make sure the oil tank is adequately A − Fuel Pump Pressure filled with clean No. 1 or No. 2 furnace oil. Measure fuel pump pressure with unit off. -
Page 18: Service
The following steps are essential to the proper operation of the room air temperature from the stack temperature. This OHR23 series oil furnaces. To prevent sooting, these in- will give you the net stack temperature. Use the efficiency structions must be followed in sequence:... -
Page 19: Start−Up & Performance Checklist
6− Brush out and vacuum the vent outlet area of the outer NOTE − A heat exchanger clean-out kit ABRSH380 drum and replace vent pipe. (35K09) is available from Lennox. 7− Clean around burner, blower deck and vestibule area. OHR23 Start−Up & Performance Check List Job No. -
Page 20: Troubleshooting
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 21 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. Check burner motor, primary Primary control tripped on safe- Reset primary control.
- Page 22 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 23 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. tinues to run, Increase combustion air − check Too little air −...
- Page 24 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. Check thermostat. Thermostat in the path of a Shield thermostat from draft or warm air draft relocate.
- Page 25 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 Adjust barometric draft con- than 10%.
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