Lennox International Inc ML193DF General, Combustion, Dilution & Ventilation Air

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 ML193DF 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 chimney or 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.

CAUTION

ML193DF unit should not be installed in areas nor- mally subject to freezing temperatures.

WARNING

Product contains fiberglass wool.

Disturbing the insulation in this product during installation, maintenance, or repair will expose you to fiberglass wool. Breathing this may cause lung cancer. (Fiberglass wool is known to the State of Cal- ifornia to cause cancer.)

Fiberglass wool may also cause respiratory, skin, and eye irritation.

To reduce exposure to this substance or for further information, consult material safety data sheets available from address shown below, or contact your supervisor.

Lennox Industries Inc.

P.O. Box 799900

Dallas, TX 75379−9900

Combustion, Dilution & Ventilation Air

If the ML193DF 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 and flue gases are discharged out− doors.

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

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 ML193DF furnaces to ensure effi- cient and safe operation. You must consider combustion air needs and requirements for exhaust vents and gas pip−ing. A portion of this information has been reprinted with permission from the National Fuel Gas Code (ANSI− Z223.1/NFPA 54). This reprinted material is not the com- plete and official position of the ANSI on the referenced subject, which is represented only by the standard in its entirety.

In Canada, refer to the CSA B149 installation codes.

CAUTION

Do not install the furnace in a corrosive or contami- nated atmosphere. Meet all combustion and ventila- tion air requirements, as well as all local codes.

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