Use Of Furnace As Construction Heater - Lennox EL296UH045XV36B Installation Instructions Manual

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.
Installation Locations
This furnace is CSA International certified for installation
clearances to combustible material as listed on the unit
nameplate and in the table in Figure 12. Accessibility and
service clearances must take precedence over fire protec-
tion 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 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
hazardous atmosphere, the furnace must be installed ac-
cording to recommended good practice requirements and
current 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. Fail-
ure to do so may cause erratic limit operation and prema-
ture heat exchanger failure.
This EL296UHV furnace must be installed so that its elec-
trical components are protected from water. Installed in
Combination with a Cooling Coil When this furnace is
used with cooling coils (Figure 3), it shall be installed in
parallel with, or on the upstream side of, cooling coils 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 ai
from entering the furnace. If the damper is manually op-
erated, 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, this furnace must be electrically grounded
according to local codes. In addition, in the United States,
installation must conform with the current National Elec-
tric 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
(open during heating operation only)
(open during cooling operation only)
Heating Unit Installed Upstream of Cooling Unit
NOTE - This furnace is designed for a minimum contin-
uous return air temperature of 60°F (16°C) or an inter-
mittent 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 EL296UHV furnace may be installed in alcoves, clos-
ets, attics, basements, garages, crawl spaces and utility
rooms in the upflow or horizontal position. This furnace
design has not been CSA certified for installation in mobile
homes, recreational vehicles, or outdoors.

Use of Furnace as Construction Heater

NOTE - Gas furnaces manufactured on or after May 1st
2017 are not permitted to be used in Canada for heating
of buildings or structures under construction.
The following statement only applies to the US. Lennox
does not recommend the use of EL296UHV units as a
construction heater during any phase of construction. Very
low return air temperatures, harmful vapors, construction
dust and operation of the unit with clogged or misplaced
filters may damage the unit.
However, EL296UHV units may be used for heating of
buildings or structures under construction in the US, if the
following conditions are met to ensure proper operation:
• 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.
• Return air temperature range between 60°F (16°C)
and 80°F (27°C) must be maintained.
• Air filters must be installed in the system and must
be maintained during construction.
Page 4
Dampers
Gas Unit
Air Handler Unit
Dampers
Gas Unit
Evaporator
Figure 3