Use Of Furnace As Construction Heater - Lennox EL296DFV Installation Instructions Manual

be installed according to the current National Fuel Gas Code
(ANSI‐Z223.1/NFPA 54). The National Fuel Gas Code is
available from the following address:
American National Standards Institute, Inc.
11 West 42nd Street
New York, NY 10036
In Canada, installation must conform with current National
Standard of Canada CSA‐B149 Natural Gas and Propane
Installation Codes, local plumbing or waste water codes
and other applicable local codes.
In order to ensure proper unit operation in non-direct vent
applications, combustion and ventilation air supply must be
provided according to the current National Fuel Gas Code
or CSA‐B149 standard.
Locations and Clearances
This furnace is CSA International certified for installation
clearances to combustible material as listed on the unit
nameplate and in the table in figure 13. Accessibility and ser­
vice clearances must take precedence over fire protection
clearances.
For installation in a residential garage, the furnace must
be installed so that the burner(s) and the ignition source
are located no less than 18 inches (457 mm) above the
floor. The furnace must be located or protected to avoid
physical damage by vehicles. When a furnace is installed
in a public garage, hangar, or other building that has a haz­
ardous atmosphere, the furnace must be installed accord­
ing to recommended good practice requirements and cur­
rent National Fuel Gas Code or CSA B149 standards.
NOTE - Furnace must be adjusted to obtain a temperature
rise within the range specified on the unit nameplate. Failure
to do so may cause erratic limit operation and premature heat
exchanger failure.
This EL296DFV furnace must be installed so that its electri­
cal components are protected from water.
Installation in Combination with a Cooling Coil
When this furnace is used with cooling units (figure 3), it
shall be installed in parallel with, or on the upstream side of,
cooling units to avoid condensation in the heating compart­
ment. 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 manu­
ally operated, it must be equipped to prevent operation of ei­
ther the heating or the cooling unit, unless it is in the full
HEAT or COOL setting.
When installed, this 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.
Heating Unit Installed Parallell to Air Handler Unit
GAS UNIT
Dampers
(open during heating
operation only)
NOTE - This furnace is designed for a minimum continu­
ous return air temperature of 60°F (16°C) or an intermit­
tent operation down to 55°F (13°C) dry bulb for cases
where a night setback thermostat is used. Return air tem­
perature must not exceed 85°F (29°C) dry bulb.
The EL296DFV furnace may be installed in alcoves, clos­
ets, attics, basements, garages, utility rooms and crawl
spaces.
This furnace design has not been CSA certified for installa­
tion in mobile homes, recreational vehicles, or outdoors.
Never use an open flame to test for gas leaks. Check all
connections using a commercially available soap solution
made specifically for leak detection.

Use of Furnace as Construction Heater

Lennox does not recommend the use of EL296DFV units
as a construction heater during any phase of construction.
Very low return air temperatures, harmful vapors and op­
eration of the unit with clogged or misplaced filters will dam­
age the unit.
EL296DFV units may be used for heating of buildings or
structures under construction, if the following conditions
are met:
• The vent system must be permanently installed per
these installation instructions.
• A room thermostat must control the furnace. The use of
fixed jumpers that will provide continuous heating is not
allowed.
• The return air duct must be provided and sealed to the
furnace.
Page 4
AIR HANDLER
Dampers
(open during cooling
operation only)
FIGURE 3