Lennox G32 SERIES Unit Information

Page 1
 1998 Lennox Industries Inc.
Litho U.S.A.
Corp. 9729−L12
G32
Service Literature
revised 03−2003
G32 SERIES UNITS
G32 series units are high−efficiency upflow gas furnaces
manufactured with DuralokPlus aluminized steel clam
shelltype heat exchangers. G32 units are available in
heating capacities of 75,000 to 125,000 Btuh and cooling
applications up to 5 tons. Refer to Engineering Handbook
for proper sizing.
Units are factory equipped for use with natural gas only. LP
kits are available. All G32−1 through −4 model units feature
the Lennox SureLight silicon nitride ignition system. G32−5
and later model units feature the SureLight two stage inte
grated control board. The G32 units meet the California Nitro
gen Oxides (NO
x
) Standards and California Seasonal Effi
ciency requirements without modification. All units use a two−
stage gas valve along with a two−stage combustion air blow
er. The gas valve is redundant to assure safety shut−off as re
quired by A.G.A. or C.G.A.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are
subject to change. Procedures outlined in this manual are
presented as a recommendation only and do not super
sede 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.
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 qualified installer or service
agency.
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.
TABLE OF CONTENTS
General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Data 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Altitude 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vent Table 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I Unit Components 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II Placement and Installation 18. . . . . . . . . . . . . . . . . . . .
III Start Up 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VI Heating System Service Checks 27. . . . . . . . . . . . . .
V Typical Operating Pressures 29. . . . . . . . . . . . . . . . . .
VI Maintenance 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VII Wiring Diagrams and Operating Sequence 34. . . . .
VIII Trouble Shooting Guide SureLight Control 51. . . . .

Lennox G32 SERIES Specifications

General

Brand	Lennox
Model	G32 SERIES
Category	Furnace
Language	English