Lennox SL280UHNV - User Manual

Page 1
UNIT INFORMATIONUNIT INFORMATION
Service Literature
©2017 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.
SL280UHNVseries units are 80% e󰀩ciency gas furnac-
es used for upow or horizontal applications only, manu-
factured with heat exchangers formed of aluminized steel
tubes. SL280UHNV units are available in heating capac-
ities of 40,000 to 100,000 Btuh and cooling applications
up to 5 tons. Refer to Engineering Handbook for proper
sizing.
Units are approved for installations up 4500 ft. SL280UHNV
model units are equipped with the Lennox
®
Communicat-
ing SureLight
®
two-stage variable speed integrated con-
trol. SL280UHNV unit meets the California Nitrogen Ox-
ides (NOx) Standards and California Seasonal E󰀩ciency
requirements. All units use a redundant gas valve to as-
sure 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.
SL280UHNV
Corp 1601-L8
Revised 05/2023
COMMUNICATING -ENABLED SL280UHNV SERIES UNITS
Contents
Specications .................................................................2
Blower Data ....................................................................6
I-Unit Components........................................................ 11
II-Placement and Installation ........................................33
III-Start-Up ....................................................................33
IV-Heating System Service Checks ..............................33
V-Typical Operating Characteristics .............................42
VI-Maintenance ............................................................43
VII- Wiring and Sequence of Operation ........................40
VIII- Field Wiring With Conventional Thermostat ..........46
IX- Program Unit Capacity Size Modes ........................ 54
X- Troubleshooting .......................................................55

Lennox SL280UHNV Specifications

General

Model	SL280UHNV
Type	Air Conditioner
Refrigerant	R-410A
Blower Motor	Variable Speed
Phase	1
Efficiency Rating	High Efficiency
Warranty	10-Year Limited Warranty on covered components
Unit Dimensions	Varies by model
Unit Weight	Varies by model
Maximum Fuse Size	Varies by model