Lennox International Inc Elite Series Gas Furnace General, Combustion, Dilution & Ventilation Air

DThe input rate and temperature rise must be set per the furnace rating plate.

DOne hundred percent (100%) outdoor air must be pro­ 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.

DThe furnace heat exchanger, components, duct system, air filters and evaporator coils must be thoroughly cleaned following final construction clean-up.

DAll furnace operating conditions (including ignition, in­ 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.

•The “A” coil drain pan is high quality engineering poly­ mer with a maximum service temperature of 500° F. However, adequate space must be provided between the drain pan and the furnace heat exchanger. At least 2” space is required for sectionalized heat exchanger and and 4” for drum-type or oil-fired furnace exchanger. Closer spacing may damage the drain pan and cause leaking.

CAUTION

EL296UHE unit should not be installed in areas nor­ mally subject to freezing temperatures.

WARNING

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.

WARNING

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 practices make it necessary to bring in air from outside for combustion. Take into account that exhaust fans, ap­ pliance 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 combus­ tion, 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 po­ tentially 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 EL296UHE furnaces to ensure effi­ cient and safe operation. You must consider combustion air needs and requirements for exhaust vents and gas

Page 5