DAir filters must be replaced upon construction comple tion.
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 sys tem, air filters and evaporator coils must be thoroughly cleaned following final construction
DAll furnace operating conditions (including ignition, in put rate, temperature rise and venting) must be verified according to these installation instructions.
•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
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 ML193UH 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
•When the furnace is installed in
•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
ML193UH 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
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
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 ML193UH is installed as a
NOTE - In
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)
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