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© 2000 Lennox Industries Inc.
G40UH(X)
Service Literature
Corp. 0006−L3
Revised 09−2006
G40UH(X) series units are mid−efficiency gas furnaces
used for upflow or horizontal applications only, manufac-
tured with Lennox Duralok Plus heat exchangers formed of
aluminized steel. G40UH(X) units are available in heating
capacities of 44,000 to 154,000 Btuh and cooling applica-
tions up to 5 tons. Refer to Engineering Handbook for prop-
er sizing.
Units are factory equipped for use with natural gas. Kits are
available for conversion to LPG operation. G40UH(X) model
units are equipped with a hot surface ignition system. The
G40UH(X) unit meets the California Nitrogen Oxides (NO
x
)
Standards and California Seasonal 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. 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 recommended only and do not constitute
code.
TABLE OF CONTENTS
Specifications Page 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Data Page 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Altitude Page 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Identification Page 14. . . . . . . . . . . . . . . . . . . . . . . .
I Unit Components Page 16. . . . . . . . . . . . . . . . . . . . . . .
II Installation Page 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
III Start Up Page 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV Heating System Service Checks Page 24. . . . . . . . .
V Typical Operating Characteristics Page 28. . . . . . . . .
VI Maintenance Page 28. . . . . . . . . . . . . . . . . . . . . . . . . .
VII Wiring and Sequence of Operation Page 30. . . . . .
VIII SureLight Troubleshooting Guide Page 41. . . . . . .
IMPORTANT
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 qualified installer, 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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