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02/12
*2P0212*
506894−01
*P506894-01*
E 2012 Lennox Industries Inc.
Dallas, Texas, USA
UPFLOW
HORIZONTAL LEFT HORIZONTAL RIGHT
AIR FLOW
AIR FLOWAIR FLOW
INSTALLATION
INSTRUCTIONS
EL280UH
ELITE
®
SERIES GAS FURNACE
UPFLOW / HORIZONTAL AIR DISCHARGE
506894−01
02/2012
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
This is a safety alert symbol and should never be ignored.
When you see this symbol on labels or in manuals, be alert
to the potential for personal injury or death.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a licensed professional installer (or
equivalent), service agency or the gas supplier.
CAUTION
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
Table of Contents
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangement 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EL280UH Gas Furnace 4. . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List 4. . . . . . . . . . . . . . . . . . . . . . . .
Safety Information 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Use of Furnace as a Construction Heater 5. . . . . . . . . . .
General 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combustion, Dilution & Ventilation Air 6. . . . . . . . . . . . . .
Setting Equipment 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filters 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct System 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Venting 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Piping 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Integrated Control 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Start−Up 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Pressure Adjustment 33. . . . . . . . . . . . . . . . . . . . . . . .
High Altitude 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Proper Combustion 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other Unit Adjustments 35. . . . . . . . . . . . . . . . . . . . . . . . . .
Sequence of Operation 36. . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Performance Data 37. . . . . . . . . . . . . . . . . . . . . . . .
Service 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Planned Service 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair Parts List 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Integrated Control Diagnostic Codes 43. . . . . . . . . . . . . . .
Troubleshooting 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Litho U.S.A.