General; Combustion, Dilution & Ventilation Air - Lennox EL195UHE Installation Instructions Manual

• 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 EL195UHE 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 vent termination point.
• When the furnace is installed in non-direct vent ap-
plications, do not install the furnace where drafts
might blow directly into it. This could cause improp-
er combustion and unsafe operation.
• When the furnace is installed in non-direct vent ap-
plications, do not block the furnace combustion air
opening with clothing, boxes, doors, etc. Air is need-
ed 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.
• When the furnace is installed in an unconditioned
space, consider provisions required to prevent
freezing of condensate drain system.
• Please consult the manufacturer of your evaporator
coil for their recommendations on distance required
between the heat exchanger and their drain pan.
Adequate space must be provided between the
drain pan and the furnace heat exchanger.
CAUTION
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.
This product contains a chemical known to the State
of California to cause cancer, birth defects, or other
reproductive harm.
Insufficient combustion air can cause headaches,
nausea, dizziness or asphyxiation. It will also cause
excess water in the heat exchanger resulting in rusting
and premature heat exchanger failure. Excessive
exposure to contaminated combustion air will result
in safety and performance related problems. Avoid
exposure to the following substances in the combustion
air supply:
Permanent wave solutions
Chlorinated waxes and cleaners
Chlorine base swimming pool chemicals
Water softening chemicals
De-icing salts or chemicals
Carbon tetrachloride
Halogen type refrigerants
Cleaning solvents (such as perchloroethylene)
Printing inks, paint removers, varnishes, etc.
Hydrochloric acid
Cements and glues
Antistatic fabric softeners for clothes dryers
Masonry acid washing materials
Combustion, Dilution & Ventilation Air
If the EL195UHE is installed as a Non-Direct Vent Fur-
nace, follow the guidelines in this section.
NOTE - In Non-Direct Vent installations, combustion air is
taken from indoors or ventilated attic or crawlspace and
flue gases are discharged out-doors. In the past, there
was no problem in bringing in sufficient outdoor air for
combustion. Infiltration provided all the air that was need-
ed. In today's homes, tight construction practices make it
necessary to bring in air from outside for combustion. Take
into account that exhaust fans, appliance vents, chimneys,
and fireplaces force additional air that could be used for
combustion out of the house. Unless outside air is brought
into the house for combustion, negative pressure (outside
pressure is greater than inside pressure) will build to the
point that a downdraft can occur in the furnace vent pipe
or chimney. As a result, combustion gases enter the living
space creating a potentially dangerous situation.
In the absence of local codes concerning air for combus-
tion and ventilation, use the guidelines and procedures in
this section to install EL195UHE furnaces to ensure effi-
cient and safe operation. You must consider combustion
air needs and requirements for exhaust vents and gas
piping.
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WARNING
WARNING