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02/11
*2P0211*
506611−01
*P506611-01*
E 2011 Lennox Industries Inc.
Dallas, Texas, USA
AIR FLOW
DOWNFLOW
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.
INSTALLATION
INSTRUCTIONS
SLP98DFV
DAVE LENNOX SIGNATURE
®
COLLECTION GAS FURNACE
DOWNFLOW AIR DISCHARGE
506611−01
02/2011
Supersedes 10/2010
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.
CAUTION
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
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 30.
Table of Contents
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangement 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SLP98DFV Gas Furnace 4. . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List 4. . . . . . . . . . . . . . . . . . . . . . . .
Safety Information 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Use of Furnace as a Construction Heater 5. . . . . . . . . . .
General 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting Equipment 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filters 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct System 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pipe and Fittings Specifications 10. . . . . . . . . . . . . . . . . . .
Joint Cementing Procedure 11. . . . . . . . . . . . . . . . . . . . . .
Venting Practices 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vent Piping Guidelines 12. . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Piping 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Integrated Control 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Motor Performance 40. . . . . . . . . . . . . . . . . . . . . . .
Unit Start Up 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Pressure Measurement 46. . . . . . . . . . . . . . . . . . . . .
High Altitude Information 46. . . . . . . . . . . . . . . . . . . . . . . .
Proper Combustions 47. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other Unit Adjustments 46. . . . . . . . . . . . . . . . . . . . . . . . . .
Heating Sequence of Operation 48. . . . . . . . . . . . . . . . . .
Service 50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Planned Service 52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Integrated Control Diagnostic Codes 53. . . . . . . . . . . . . .
Configuring Unit Size Codes 56. . . . . . . . . . . . . . . . . . . . .
Troubleshooting 57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair Parts List 63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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