Use Of Furnace As A Construction Heater; General - Lennox ELITE Series Installation Instructions Manual

Installed in Combination with a Cooling Coil
When this 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.
See figure 1. 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. See figure 1.
Heating Unit Installed Parallel to Cooling Coil
Dampers
(open during heating operation only)
Cooling Coil
Dampers
(open during cooling operation only)
Heating Unit Installed Upstream of Cooling Unit
Cooling Coil
FIGURE 1
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
NOTE - This furnace is designed for a minimum continuous
return air temperature of 60°F (16°C) or an intermittent op­
eration 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 EL280UH furnace may be installed in alcoves, closets,
attics, basements, garages, crawl spaces and utility rooms
in the upflow or horizontal position.
Gas Unit
Gas Unit
This furnace design has not been CSA International
certified for installation in mobile homes, recreational
vehicles, or outdoors.
Use of Furnace as Construction Heater
Lennox does not recommend the use of EL280UH 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.
EL280UH 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
D
these installation instructions.
D 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
D
furnace.
Return air temperature range between 60°F (16°C) and
D
80°F (27°C) must be maintained.
Air filters must be installed in the system and must be
D
maintained during construction.
D Air filters must be replaced upon construction comple­
tion.
D The input rate and temperature rise must be set per the
furnace rating plate.
One hundred percent (100%) outdoor air must be pro­
D
vided for combustion air requirements during construc­
tion. Temporary ducting may supply outdoor air to the
furnace. Do not connect duct directly to the furnace.
Size the temporary duct following these instructions in
section for Combustion, Dilution and Ventilation Air in a
confined space with air from outside.
D The furnace heat exchanger, components, duct sys­
tem, air filters and evaporator coils must be thoroughly
cleaned following final construction clean-up.
All furnace operating conditions (including ignition, in­
D
put rate, temperature rise and venting) must be verified
according to these installation instructions.

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 must be considered
when installing a EL280UH furnace:
Place the furnace as close to the center of the air dis­
D
tribution system as possible. The furnace should also be
located close to the chimney or vent termination point.
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