General; Combustion, Dilution, Ventilation Air - Lennox EL296UHE Installation Instructions Manual

The input rate and temperature rise must be set per the
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furnace rating plate.
One hundred percent (100%) outdoor air must be pro­
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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.
The furnace heat exchanger, components, duct sys­
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tem, air filters and evaporator coils must be thoroughly
cleaned following final construction clean-up.
All furnace operating conditions (including ignition, in­
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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 an EL296UHE furnace:
• Place the furnace as close to the center of the air dis­
tribution system as possible. The furnace should also be
located close to the vent termination point.
• When the furnace is installed in non-direct vent applica­
tions, do not install the furnace where drafts might blow
directly into it. This could cause improper combustion
and unsafe operation.
• When the furnace is installed in non-direct vent applica­
tions, do not block the furnace combustion air opening
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 insu­
lated space, keep insulation away from the furnace.
• 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. Ad­
equate space must be provided between the drain pan
and the furnace heat exchanger.
CAUTION
EL296UHE unit should not be installed in areas nor­
mally subject to freezing temperatures.
The State of California has determined that this prod­
uct may contain or produce a chemical or chemicals,
in very low doses, which may cause serious illness
or death. It may also cause cancer, birth defects or
reproductive harm.
Insufficient combustion air can cause headaches,
nausea, dizziness or asphyxiation. It will also cause
excess water in the heat exchanger resulting in rust­
ing 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 com­
bustion 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 EL296UHE 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 needed. In today's homes, tight construction prac­
tices make it necessary to bring in air from outside for com­
bustion. 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 out­
side 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 fur­
nace vent pipe or chimney. As a result, combustion gases
enter the living space creating a potentially dangerous situ­
ation.
In the absence of local codes concerning air for combus-
tion and ventilation, use the guidelines and procedures in
this section to install EL296UHE furnaces to ensure effi­
cient and safe operation. You must consider combustion
air needs and requirements for exhaust vents and gas pip­
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WARNING
WARNING