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©
2016 Lennox Industries Inc.
Corp. 1139-L11
Revised 06/2016
EL280DF
Service Literature
EL280DF SERIES UNITS
EL280DF series units are 80% efficiency gas furnaces
used for downflow applications only, manufactured with
Lennox Duralok
t
heat exchangers formed of aluminized
steel. Units are available in heating capacities of 66,000 to
110,000 Btuh and cooling applications 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. EL280DF model
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
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Blower Performance Data
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Parts Identification
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I Unit Components
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II Installation
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III Start Up
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IV Heating System Service Checks
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V Typical Operating Characteristics
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VI Maintenance
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VII Wiring and Sequence of Operation
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VIII Field Wiring and DIP Switch Settings
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IX Troubleshooting Flow Chart
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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.
