Lennox G24M3/4-100 User Manual

Page 8
Setting Equipment
The Lennox G24M multiposition gas furnace can be
installed as shipped in upflow or horizontal position with
righthand or lefthand discharge. The furnace can easi
ly be converted for downflow applications.
Select a location that allows for required clearances
listed on the unit rating plate. Also consider gas supply
connections, electrical supply, vent connection and
installation and service clearances [24 inches (610 mm)
at unit front].
NOTE - 1/3 and 1/2 hp blower motors are equipped with ei
ther four flexible mounting legs or three flexible legs and
one rigid leg. The rigid leg is equipped with a shipping bolt
and a flat white plastic washer (rather than the rubber
mounting grommet used with a flexible mounting leg). This
shipping bolt and flat washer must be removed before the
furnace is put into operation. Once the shipping bolt and
washer are removed, the rigid leg will not touch the fan
housing.
Upflow Applications
The Lennox G24M furnace is shipped in a standard upflow
position. Level the furnace using shims or leveling bolts. Four
knockouts in the furnace base panel are factory-provided for
the installation of leveling bolts (field-provided). Allow for
clearances to combustible materials as indicated on the unit
rating plate. Minimum clearances for closet or alcove installa
tions are shown in figure 5.
In upflow applications, return air can be brought in through
the bottom or either side of the furnace. If a furnace with
bottom return air is installed on a platform, make an airtight
seal between the bottom of the furnace and the platform to
ensure proper and safe operation.
Knockouts are provided on both sides of the furnace cabi
net for installations with side return air. When side return air
is used, seal the bottom of the furnace using the panel pro
vided.
An upflow filter rack is available and must be ordered sepa
rately. The adjustable rack can be installed beneath the fur
nace (flush with cabinet edges) for bottom return air ap
plications or on the side of the furnace for side return air.
6 in. (152 mm)
0
0
2 in. (51 mm)
1 in. (25 mm)
Upflow Application
Installation Clearances
Vent
Connector
Type
Type C Type B1
TOP 1 in. (25 mm)
*FRONT 2 in. (51 mm)
BACK 0
SIDES 0
VENT 1 in. (25 mm)
0**FLOOR 0**
*Front clearance in alcove installation must be 24 in. (610
mm). Maintain a minimum of 24 in. (610 mm) for front service
access.
** For installations on a combustible floor, do not install the
furnace directly on carpeting, tile or other combustible mate
rials other than wood flooring.
RIGHT
SIDE
LEFT
SIDE
TOP
BOTTOM
FIGURE 5
UNIT CONVERSION FOR DOWNFLOW APPLICATION
REMOVE
TOP CAP
REMOVE
BOTTOM
REMOVE
FOUR
SCREWS
DISCONNECT WIRE
HARNESS JACKPLUGS
AND SENSOR LEAD
FROM CONTROL
BOARD
REINSTALL
TOP CAP ON
UNIT BOTTOM
REINSTALL
BOTTOM ON
UNIT TOP
ROTATE HEAT
EXCHANGER &
REINSTALL
RECONNECT
WIRE HARNESS JACK
PLUGS AND SENSOR
LEAD AT CONTROL
BOARD
UPFLOW CONFIGURATION DOWNFLOW CONFIGURATION
SINGLE-WALLED VENT
PIPE FROM COMBUSTION
AIR BLOWER FLUE
ADAPTER TO FURNACE
FLUE OUTLET
(Furnished by installer)
FIGURE 6

Lennox G24M3/4-100 Specifications

General

Brand	Lennox
Model	G24M3/4-100
Category	Furnace
Language	English