Use Of Furnace As Construction Heater - Lennox EL195UHE Installation Instructions Manual

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.
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 EL195UHE 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 com-
partment. 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 operated, it must be equipped to prevent op-
eration 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 continu-
ous return air temperature of 60°F (16°C) or an intermittent
operation down to 55°F (13°C) dry bulb for cases where a
night setback thermostat is used. Return air temperature
must not exceed 85°F (29°C) dry bulb.
The EL195UHE 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 EL195UHE 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, EL195UHE 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.
Page 4
Dampers
Gas Unit
Air Handler Unit
Dampers
Gas Unit
Evaporator
FIGURE 3