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UNIT INFORMATION
UNIT INFORMATION
S e r v i c e L i t e r a t u r e
©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.
WARNING
To prevent serious injury or death:
1- Lock-out/tag-out before performing maintenance.
2- If system power is required (e.g., smoke detector
maintenance), disable power to blower, remove
fan belt where applicable, and ensure all
controllers and thermostats are set to the “OFF”
position before performing maintenance.
3- Always keep hands, hair, clothing, jewelry, tools,
etc., away from moving parts
.
SL280UHV(X) series units are 80% efficiency gas furnac
-
es used for upflow or horizontal applications only, man
-
ufactured with Lennox Duralok heat exchangers formed
of aluminized steel. SL280UHV(X) units are available in
heating capacities of 66,000 to 132,000 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. SL280UH
-
V(X) model units are equipped with a communicating
SureLight
®
two-stage variable speed integrated control.
SL280UHV(X) unit meets the California Nitrogen Oxides
(NOx) Standards and California Seasonal Efficiency re
-
quirements. 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.
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.
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.
TABLE OF CONTENTS
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
Blower Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3
I Unit Components . . . . . . . . . . . . . . . . . . . . . . . Page 17
II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 47
III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 47
IV Heating System Service Checks . . . . . . . . . Page 48
V Typical Operating Characteristics . . . . . . . . . Page 51
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 52
VII Wiring and Sequence of Operation . . . . . . Page 54
VIII Field Wiring and Jumper Settings . . . . . . . Page 59
IX Program Unit Capacity Size Mode . . . . . . . Page 73
X Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . Page 74
SL280UHV
Corp 1116-L4
Revised 05/2022
LENNOX
®
COMMUNICATING SL280UHNV SERIES UNITS
