Lennox SL280UHNV Series Unit Information

Service Literature
COMMUNICATING-ENABLED SL280UHNV SERIES UNITS
SL280UHNV series units are 80% efficiency gas furnaces
used for upflow or horizontal applications only, manufac­
tured with Lennox Duralokt heat exchangers formed of
aluminized steel. SL280UHNV units are available in heat­
ing capacities of 40,000 to 100,000 Btuh and cooling ap­
plications up to 5 tons. Refer to Engineering Handbook for
proper sizing.
SL280UHNV model units are equipped with a communicat­
®
ing enabled SureLight two-stage variable speed integrated
control. SL280UHNV unit meets the California Nitrogen Ox­
ides (NO ) Standards and California Seasonal Efficiency re­
x
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. Pro­
cedures outlined in this manual are presented as a recom­
mendation only and do not supersede or replace local or
state codes. In the absence of local or state codes, the
guidelines and procedures outlined in this manual (except
where noted) are recommendations only and do not consti­
tute code.

TABLE OF CONTENTS

I Unit Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
III Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV Heating System Service Checks
V Typical Operating Characteristics
VI Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VII Wiring and Sequence of Operation
VIII Field Wiring and Jumper Settings
IX Program Unit Capacity Size Mode
X Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Corp. 1601-L8
Revised 02/2021
4
16
30
31
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37
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49
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SL280UHNV
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person­
al injury or loss of life. Installation and service must
be performed by a licensed professional HVAC in­
staller (or equivalent), service agency or the gas sup­
plier.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal in­
jury. Take care while handling this equipment and
wear gloves and protective clothing.
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