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© 2019 Lennox Industries Inc.
Corp. 1902-L1
EL280DFE
Service Literature
EL280DFE SERIES UNITS
EL280DFE series units are 80% efficiency gas furnaces
used for downflow applications only, manufactured with
Lennox Duralokt heat exchangers formed of aluminized
steel. Units are available in heating capacities of 66,000 to
88,000 Btuh and cooling applications up to 4 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. EL280DFE mod
el units are equipped with the SureLight
®
integrated control.
All units use a redundant gas valve to assure safety shut-off
as required by CSA.
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.............................
Blower Performance Data Page 3..................
Parts Identification Page 4.........................
I Unit Components Page 5........................
II Installation Page 20............................
III Start Up Page 20..............................
IV Heating System Service Checks Page 22.........
V Typical Operating Characteristics Page 24.........
VI Maintenance Page 25..........................
VII Wiring and Sequence of Operation Page 28......
VIII Field Wiring and DIP Switch Settings Page 31....
IX Troubleshooting Flow Chart Page 35.............
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 in
jury. Take care while handling this equipment and
wear gloves and protective clothing.
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