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Adequate clearance must be made around the air open
ings into the vestibule area. Provisions must be made for
proper operation and for combustion air and ventilation air
supply according to the current National Fuel Gas Code or
CAN/CGAB149 standards.
Vent installations must be according to the provided vent
ing tables and applicable provisions of local building codes.
This furnace is AGA and CGA certified for installation clear
ances to combustible material as listed on the unit rating plate
and in the tables in figures 5, 7 and 9. Accessibility and ser
vice clearances must take precedence over fire protection
clearances.
NOTE - For installation on combustible floors, the furnace shall
not be installed directly on carpeting, tile, or other combustible
material other than wood flooring.
For installation in a residential garage, the furnace must be
installed so that the burner(s) and the ignition source are lo
cated no less than 18 inches (457 mm) above the floor. The
furnace must be located or protected to avoid physical dam
age by vehicles. When a furnace is installed in a public garage,
hangar, or other building that has a hazardous atmosphere,
the furnace must be installed according to recommended
good practice requirements and current National Fuel Gas
Code or CAN/CGA B149.1 and B149.2 standards.
The furnace must be adjusted to obtain a temperature rise
within the range specified on the unit rating plate.
The G24M furnace must be installed so that electrical com
ponents are protected from water.
When the furnace is used with cooling units, it shall be
installed in parallel with, or on the upstream side of, cooling
units to avoid condensation in the heating compartment.
With a parallel flow arrangement, a damper (or other means
to control the flow of air) must adequately prevent chilled air
from entering the furnace. If the damper is manually oper
ated, it must be equipped to prevent operation of either the
heating or the cooling unit, unless it is in the full HEAT" or
COOL" setting.
When installed, the furnace must be electrically grounded
according to local codes. In addition, in the United States,
installation must conform with the current National Electric
Code, ANSI/NFPA No. 70. The National Electric Code
(ANSI/NFPA No. 70) is available from the following ad
dress:
National Fire Protection Association
1 Battery March Park
Quincy, MA 02269
In Canada, all electrical wiring and grounding for the unit
must be installed according to the current regulations of the
Canadian Electrical Code Part I (CSA Standard C22.1)
and/or local codes.
Field wiring connections must meet or exceed specifica
tions of type T wire and withstand a maximum temperature
rise of 180°F (82°C) .
When the furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside of the space con
taining the furnace, return air shall be handled by a duct(s)
sealed to the furnace casing and terminating outside space
containing furnace.
NOTE - G24M series units must not be used as a construc
tion heater during any phase of construction. Very low re
turn air temperatures, harmful vapors and misplacement of
the filters will damage the unit and lower its efficiency.
The Lennox G24M furnace may be installed in alcoves,
closets, attics, basements, garages and utility rooms in the
upflow, downflow, or horizontal position.
This furnace design has not been AGA or CGA certified for
installation in mobile homes, recreational vehicles, or out
doors.
WARNING
The blower access panel must be securely in place
when the blower and burners are operating. Gas
fumes, which could contain carbon monoxide, can
be drawn into living space resulting in personal inju
ry or death.
General
These instructions are intended as a general guide and do not
supersede local codes in any way. Consult authorities having
jurisdiction before installation.
In addition to the requirements outlined previously, the fol
lowing general recommendations should be considered
when installing the Lennox G24M furnace.
The furnace should be placed as close to the center of the
air distribution system as possible. The furnace should also
be located close to the chimney or vent termination point.
Do not install the furnace where drafts might blow directly
into it. This could cause improper combustion and unsafe
operation.
Do not block furnace combustion air openings with cloth
ing, boxes, doors, etc. Combustion air is needed for proper
combustion and safe unit operation.
When the furnace is installed in an attic or other insulated
space, keep insulation away from the furnace.
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