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© 2016 Lennox Industries Inc.
Corp. 1030-L7
SLP98DFV
Service Literature
Revised 05-2016
SLP98DFV SERIES UNITS
SLP98DFV series units are high-efficiency downflow gas
furnaces equipped with variable capacity gas valve, vari
able speed combustion air inducer and variable speed in
door blower motor. All models are designed for direct vent
(dual pipe) venting system only. SLP98DFV units are avail
able in heating capacities from 66,000 to 132,000 Btuh
(19.3 to 38.6 kW) and cooling applications from 2 to 5 tons
(7.0 kW to 17.5 kW). Refer to Engineering Handbook for
proper sizing.
Units are factory-equipped for use with natural gas. Kits are
available for conversion to LPG operation. SLP98DFV mod
els include a SureLight
®
variable capacity integrated control
that can be used with Lennox icomfort Wi-Fi
®
thermostat as
part of a communicating comfort system. All SLP98DFV
units meet the California Nitrogen Oxides (NO
x
) Standards
and California Seasonal Efficiency requirements.
All specifications in this manual are subject to change. Pro
cedures outlined in this manual are presented as recom
mendations only and do not supersede or replace local or
state codes. In the absence of local or state codes, the
guidelines and procedures outlined in this manual (except
where noted) are recommendations only and do not consti
tute code.
TABLE OF CONTENTS
Specifications Page 2.............................
Optional Accessories Page 3......................
Blower Data Page 4..............................
I Unit Components Page 8........................
II icomfort Wi-Fi
®
Thermostat Page 33..............
III Placement and Installation Page 35..............
IV Start Up Page 53..............................
V Heating System Service Checks Page 54..........
VI Typical Operating Characteristics Page 57........
VII Maintenance Page 57..........................
VIII Wiring and Sequence of Operation Page 60.....
IX Field Wiring Page 68...........................
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 HVAC in
staller (or equivalent), service agency or the gas sup
plier.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon
nect switch(es). Unit may have multiple
power supplies.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal injury.
Take care while handling this equipment and wear
gloves and protective clothing.
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