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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.
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.
CAUTION
Failure to use properly sized wiring and circuit breaker
may result in property damage. Size wiring and circuit
breaker(s) per Product Specifications bulletin (EHB) and
unit rating plate.
SL280DFnVseries units are 80% efficiency gas furnaces
used for upflow or horizontal applications only, manufac
-
tured with Lennox Duralok heat exchangers formed of alu-
minized steel. SL28DFV units are available in heating ca-
pacities of 60,000 to 80,000 Btuh and cooling applications
up to 5 tons. Refer to Engineering Handbook for proper
sizing.
SL280DFNV model units are equipped with a communi-
cating enabled SureLight
®
two-stage variable speed in-
tegrated control. SL280DFNV unit meets the California
Nitrogen Oxides (NOx) Standards and California Season-
al Efficiency 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.
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
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Blower Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Parts Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
I Unit Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
II Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
III Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
IV Heating System Service Checks . . . . . . . . . . . . . . 28
V Typical Operating Characteristics . . . . . . . . . . . . . . 33
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
VII Sequence of Operation . . . . . . . . . . . . . . . . . . . . . 37
VIII Field Wiring (non communicating T stat) . . . . . . 42
IX Program Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
X Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
SL280DFNV
100027
COMMUNICATING -ENABLED SL280DFNV SERIES UNITS
