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© 2010 Lennox Industries Inc.
Corp. 1029−L7
SLP98UHV
Service Literature
SLP98UHV SERIES UNITS
SLP98UHV series units are high−efficiency upflow, horizon-
tal right and left) gas furnaces equipped with variable ca-
pacity gas valve, variable speed combustion air inducer and
variable speed indoor blower motor. All models are de-
signed only for direct vent (dual pipe) venting system.
SLP98UHV units are available in heating capacities from
66,000 to 132,000 Btuh (19.3 to 38.6 kW) and cooling ap-
plications from 2 to 5 tons (7.0 kW to 17.5 kW). Refer to En-
gineering Handbook for proper sizing.
Units are factory−equipped for use with natural gas. Kits are
available for conversion to LPG operation. SLP98UHV mod-
els include a SureLight
®
variable capacity integrated control
that can be used with Lennox icomfort Touch thermostat as
part of a communicating comfort system. All SLP98UHV
units meet the California Nitrogen Oxides (NO
x
) Standards
and California Seasonal Efficiency requirements.
All specifications in this manual are subject to change. Pro-
cedures outlined in this manual are presented as recom-
mendations 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories Page 3. . . . . . . . . . . . . . . . . . . . . .
Blower Data Page 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I Unit Components Page 14. . . . . . . . . . . . . . . . . . . . . . . .
II Icomfort Touch Thermostat Page 37. . . . . . . . . . . .
III Placement and Installation Page 39. . . . . . . . . . . . . . .
IV Start Up Page 53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V Heating System Service Checks Page 54. . . . . . . . . .
VI Typical Operating Characteristics Page 56. . . . . . . . .
VII Maintenance Page 57. . . . . . . . . . . . . . . . . . . . . . . . . .
VIII Wiring and Sequence of Operation Page 59. . . . . .
XI Field Wiring Page 67. . . . . . . . . . . . . . . . . . . . . . . . . . .
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
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon-
nect switch(es). Unit may have multiple
power supplies.
WARNING
Sharp edges.
Be careful when servicing unit to avoid sharp edges
which may result in personal injury.
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