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GAS UNIT
Dampers
(open during heating
operation only)
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 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
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 ML180DFE furnace may be installed in alcoves, clos-
ets, attics, basements, garages, and utility rooms in the
downflow position.
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 ML180DFE units
as a construction heater during any phase of construc-
tion. Very low return air temperatures, harmful vapors and
operation of the unit with clogged or misplaced filters will
damage the unit.
ML180DFE 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.
AIR HANDLER
Dampers
(open during cooling
operation only)
Page 4
•
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.
•
Air filters must be replaced upon construction com-
pletion.
•
The input rate and temperature rise must be set per
the furnace rating plate.
•
One hundred percent (100%) outdoor air must be
provided for combustion air requirements during
construction. Temporary ducting may supply out-
door air to the furnace. Do not connect duct directly
to the furnace. Size the temporary duct following
these instructions in section for Combustion, Dilu-
tion and Ventilation Air in a confined space with air
from outside.
•
The furnace heat exchanger, components, duct
system, air filters and evaporator coils must be
thoroughly cleaned following final construction
clean-up.
•
All furnace operating conditions (including ignition,
input 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
following general recommendations must be considered
when installing a ML180DFE furnace:
•
Place the furnace as close to the center of the air
distribution system as possible. The furnace should
also be located close to the chimney or vent termi-
nation point.
•
Do not install the furnace where drafts might blow
directly into it. This could cause improper combus-
tion and unsafe operation.
•
Do not block the furnace combustion air openings
with clothing, boxes, doors, etc. 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 fur-
nace.
NOTE - The Commonwealth of Massachusetts stipu-
lates these additional requirements:
•
Gas furnaces shall be installed by a licensed
plumber or fitter only.
•
The gas cock must be "T handle" type.
•
When a furnace is installed in an attic, the pas-
sageway to and service area surrounding the
equipment shall be floored.
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