Lennox SL280UHVX Series - User Manual

Page 1
© 2010 Lennox Industries Inc.
Corp. 1001−L1
Revised 10−2010
SL280UHV(X)
Service Literature
SL280UHV(X) SERIES UNITS
SL280UHV(X) 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. SL280UHV(X) units are available in heat-
ing capacities of 66,000 to 132,000 Btuh and cooling ap-
plications 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. SL280UHV(X)
model units are equipped with the SureLight
®
two−stage
variable speed integrated control. SL280UHV(X) unit meets
the California Nitrogen Oxides (NO
x
) Standards and Califor-
nia Seasonal Efficiency requirements. All units use a redun-
dant 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
Specifications Page 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I Unit Components Page 5. . . . . . . . . . . . . . . . . . . . . . . . .
II Installation Page 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
III Start Up Page 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV Heating System Service Checks Page 28. . . . . . . . .
V Typical Operating Characteristics Page 31. . . . . . . . .
VI Maintenance Page 33. . . . . . . . . . . . . . . . . . . . . . . . . .
VII Wiring and Sequence of Operation Page 36. . . . . . .
VIII Field Wiring and Jumper Settings Page 39. . . . . . .
IX Troubleshooting Page 41. . . . . . . . . . . . . . . . . . . . . . . .
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 installer (or
equivalent), service agency or the gas supplier.
WARNING
Sharp edges.
Be careful when servicing unit to avoid sharp edges
which may result in personal injury.

Lennox SL280UHVX Series Specifications