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© 2016 Lennox Industries Inc.
Corp. 1116-L4
SL280UHV(X)
Service Literature
Revised 04/2020
iComfort
®
ENABLED SL280UHV(X) SERIES UNITS
SL280UHV(X) series units are 80% efficiency gas furnaces
used for upflow or horizontal applications only, manufac
tured with Lennox Duralok heat exchangers formed of
aluminized steel. SL280UHV(X) units are available in heat
ing capacities of 66,000 to 132,000 Btuh and cooling ap
plications up to 5 tons. Refer to Engineering Handbook for
proper sizing.
Units are factory equipped for use with natural gas. Kits are
available for conversion to LPG operation. SL280UHV(X)
model units are equipped with the iComfort
®
enabled Sur
eLight
®
two-stage variable speed integrated control.
SL280UHV(X) unit meets the California Nitrogen Oxides
(NO
x
) Standards and California Seasonal Efficiency re
quirements. All units use a redundant gas valve to assure
safety shut-off as required by C.S.A.
All specifications in this manual are subject to change. Pro
cedures outlined in this manual are presented as a recom
mendation 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.............................
I Unit Components Page 5........................
II Installation Page 43.............................
III Start Up Page 43..............................
IV Heating System Service Checks Page 44.........
V Typical Operating Characteristics Page 47.........
VI Maintenance Page 48..........................
VII Wiring and Sequence of Operation Page 51......
VIII Field Wiring and Jumper Settings Page 55.......
IX Program Unit Capacity Size Mode Page 59.......
X Troubleshooting Page 60........................
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.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in
jury. Take care while handling this equipment and
wear gloves and protective clothing.
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