Page 1
UNIT INFORMATIONUNIT INFORMATION
Service Literature
©2016 Lennox Industries, Inc.
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.
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.
EL297UHV(X) series units are 90% eciency gas furnac-
es used for upow or horizontal applications only, man-
ufactured with Lennox Duralok heat exchangers formed
of aluminized steel. EL297UHV(X) units are available in
heating capacities of 44,000 to 132,000 Btuh and cooling
applications up to 5 tons. Refer to Product Specications
Manual for proper sizing.
Units are factory equipped for use with natural gas. Kits
are available for conversion to LPG operation. EL297UH-
V(X) model units are equipped with the icomfort
®
enabled
SureLight
®
two-stage variable speed integrated control.
EL297UHV(X) unit meets the California Nitrogen Oxides
(NOx) Standards and California Seasonal Eciency re-
quirements. All units use a redundant gas valve to assure
safety shut-o as required by C.S.A.
All specications 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
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
Blower CFM Data . . . . . . . . . . . . . . . . . . . . . . . . . Page 5
I Unit Components . . . . . . . . . . . . . . . . . . . . . . . Page 26
II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 57
III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 79
IV Heating System Service Checks . . . . . . . . . Page 80
V Typical Operating Characteristics . . . . . . . . . Page 83
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 83
VII Wiring and Sequence of Operation . . . . . . Page 86
Program Unit Capacity Size Mode . . . . . . . Page 110
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . Page 111
EL297UHV(X)
100088
Communicating-ENABLED EL297UHV SERIES UNITS
To Next Page
Need help?
General