Lennox EL280UHX Series User Manual

Page 1
UNIT INFORMATIONUNIT INFORMATION
Service Literature
©2016 Lennox Industries, Inc.
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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.
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 disconnect switch(es). Unit may have multiple
power supplies.
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.
EL280UHE(X) series units are 80% e󰀩ciency gas furnac-
es used for upow or horizontal applications only, manu-
factured with Lennox Duralok heat exchangers formed of
aluminized steel. Units are available in heating capacities
of 44.000 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. EL280UHE(X)
model units are equipped with the SureLight® two-stage
integrated control. EL280UHE(X) unit meets the California
Nitrogen Oxides (NOx) Standards and California Season-
al E󰀩ciency requirements. All units use a redundant gas
valve to assure safety shut-o󰀨 as required by C.S.A.
All speci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.
TABLE OF CONTENTS
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
Blower Performance Data . . . . . . . . . . . . . . . . . . Page 5
Parts Identication. . . . . . . . . . . . . . . . . . . . . . . . Page 7
I Unit Components . . . . . . . . . . . . . . . . . . . . . . . . Page 8
II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . Page 26
III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 26
IV Heating System Service Checks . . . . . . . . . Page 26
V Typical Operating Characteristics . . . . . . . . . Page 30
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 31
VII Wiring and Sequence of Operation . . . . . . Page 34
VIII Field Wiring and DIP Switch Settings . . . . Page 38
IX Troubleshooting Flow Chart . . . . . . . . . . . . . Page 42
EL280UHE(X)
Corp 1901-L1
05/2022
EL280UHE(X) SERIES UNITS

Lennox EL280UHX Series Specifications

General

Model	EL280UHX Series
Efficiency Rating	80% AFUE
Stages	Two-Stage
Blower Type	Variable Speed
Fuel Type	Natural Gas or Propane
Warranty	Limited Lifetime Heat Exchanger Warranty