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© 2012 Lennox Industries Inc.
Corp. 1138−L11
EL280UH(X)
Service Literature
Revised 05/2012
EL280UH(X) SERIES UNITS
EL280UH(X) series units are 80% efficiency gas furnaces
used for upflow or horizontal applications only, manufac-
tured with Lennox Duralokt heat exchangers formed of
aluminized steel. EL280UH(X) units are available in heat-
ing capacities of 66,000 to 132,000 Btuh and cooling ap-
plications up to 5 tons. Product Specifications manual for
proper sizing.
Units are factory equipped for use with natural gas. Kits are
available for conversion to LPG operation. EL280UH(X)
model units are equipped with the SureLight
®
two−stage in-
tegrated control. EL280UH(X) unit meets the California Ni-
trogen Oxides (NO
x
) Standards and California Seasonal Ef-
ficiency requirements. 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Data Page 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I Unit Components Page 8. . . . . . . . . . . . . . . . . . . . . . . .
II Installation Page 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
III Start Up Page 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV Heating System Service Checks Page 19. . . . . . . . .
V Typical Operating Characteristics Page 22. . . . . . . . .
VI Maintenance Page 23. . . . . . . . . . . . . . . . . . . . . . . . . .
VII Wiring and Sequence of Operation Page 26. . . . . .
VIII Field Wiring and DIP Switch Settings Page 28. . . .
IX Troubleshooting Page 30. . . . . . . . . . . . . . . . . . . . . . .
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 installer (or
equivalent), service agency or the gas supplier.
WARNING
Sharp edges.
Be careful when servicing unit to avoid sharp edges
which may result in personal injury.
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