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06/11
*2P0611*
506710−01
*P506710-01*
E 2011 Lennox Industries Inc.
Dallas, Texas, USA
DOWNFLOW
AIR FLOW
CAUTION
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
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.
INSTALLATION
INSTRUCTIONS
SL280DFV
DAVE LENNOX SIGNATURE
®
COLLECTION GAS FURNACE
DOWNFLOW AIR DISCHARGE
506710−01
06/2011
Supersedes 01/2011
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
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.
NOTICE
A thermostat is not included and must be ordered
separately.
D The Lennox icomfort Toucht thermostat must be
used in communicating applications.
D In non−communicating applications, the Lennox
ComfortSense
®
7000 thermostat may be used, as
well as other non−communicating thermostats.
In all cases, setup is critical to ensure proper sys-
tem operation.
Field wiring for both communicating and non−com-
municating applications is illustrated in diagrams,
which begin on Page 23.
Table of Contents
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangement 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SL280DFV 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 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filters 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct System 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Venting 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Piping 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Integrated Control Settings 32. . . . . . . . . . . . . . . . . . . . . . .
Blower Performance Data 35. . . . . . . . . . . . . . . . . . . . . . . .
Unit Start−Up 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Pressure Adjustment 40. . . . . . . . . . . . . . . . . . . . . . . .
Proper Combustion 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Altitude 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other Unit Adjustments 42. . . . . . . . . . . . . . . . . . . . . . . . . .
Heating Sequence of Operation 42. . . . . . . . . . . . . . . . . . .
Service 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Planned Service 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair Parts List 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Integrated Control Diagnostic Codes 48. . . . . . . . . . . . . . .
Program Unit Capacity/Size Mode 55. . . . . . . . . . . . . . . . .
Troubleshooting 56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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