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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.
EL297DFV(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. EL297DFV(X) 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. EL297D-
FV(X) model units are equipped with a communicating
enabled SureLight
®
two-stage variable speed integrated
control.
EL297DFV(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
I Unit Components . . . . . . . . . . . . . . . . . . . . . . . . Page 9
II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 39
III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 60
IV Heating System Service Checks . . . . . . . . . Page 61
V Typical Operating Characteristics . . . . . . . . . Page 64
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 64
VII Wiring and Sequence of Operation . . . . . . Page 67
Program Unit Capacity Size Mode . . . . . . . Page 85
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . Page 86
EL297DFV
100089
Communicating-Enabled EL297DFV SERIES UNITS
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