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 a G61MP 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.
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
CAUTION
G61MP unit should not be installed in areas normally subject to freezing temperatures.
Combustion, Dilution & Ventilation Air
If the G61MP 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 G61MP furnaces to ensure efficient
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−
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