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UNIT INFORMATION
Service Literature
©2017 Lennox Industries, Inc.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer or
equivalent, service agency, or the gas supplier.
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.
SL280UHNVseries units are 80% effi ciency gas furnac-
es used for upfl ow or horizontal applications only, man-
ufactured with Lennox Duralok heat exchangers formed
of aluminized steel. SL280UHNV units are available in
heating capacities of 40,000 to 100,000 Btuh and cooling
applications up to 5 tons. Refer to Engineering Handbook
for proper sizing.
Units are approved for installations up 4500 ft and facto-
ry equipped for use with natural gas only. SL280UHNV
model units are equipped with the iComfort® enabled
SureLight® two-stage variable speed integrated control.
SL280UHNV unit meets the California Nitrogen Oxides
(NOx) Standards and California Seasonal Effi ciency re-
quirements. All units use a redundant gas valve to assure
safety shut-off as required by C.S.A.
All specifi cations in this manual are subject to change.
Procedures outlined in this manual are presented as a
recommendation only and do not supersede or replace lo-
cal or state codes. In the absence of local or state codes,
the guidelines and procedures outlined in this manual (ex-
cept where noted) are recommendations only and do not
constitute code.
SL280UHNV
Corp 1601-L8
ICOMFORT
®
-ENABLED SL280UHNV SERIES UNITS
Contents
I-Unit Components..........................................................4
Blower Data ..................................................................16
II-Placement and Installation ........................................31
III-Start-Up .................................................................... 31
IV-Heating System Service Checks ..............................32
V-Typical Operating Characteristics .............................34
VI-Maintenance ............................................................35
VII- Wiring and Sequence of Operation ........................38
VIII- Field Wiring With Conventional Thermostat ..........42
IX- Program Unit Capacity Size Modes ........................46
X- Troubleshooting .......................................................47
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