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ABOUT THE FURNACE
• This furnace has been tested for capacity and efficiency in
accordance with AHRI Standards and will provide many years
of safe and dependable comfort, providing it is properly installed
and maintained. With regular maintenance, this unit will operate
satisfactorily year after year. Abuse, improper use, and/or improper
maintenance can shorten the life of the appliance and create
unsafe hazards.
• This furnace is designed to fulfill the requirements of being
classified as a Category IV furnace. This classification is related
to the furnace’s Annual Fuel Utilization Efficiency (AFUE) rating,
the percentage of fuel that is converted into usable heating energy.
• Category IV furnaces typically have an AFUE rating over 90%
and are mainly vented through plastic PVC pipe.
AIR FILTERS
WARNING:
Never operate the furnace without a filter in place.
Accumulating dust in the return air can build up on
internal components, resulting in loss of efficiency,
equipment damage, and possible fire.
• An air filter is supplied with the furnace as shipped from the
factory.
• The furnace should always have a clean filter. If the filter becomes
dirty, it should be cleaned or replaced. The filter is installed over
the return air grille of the door inside the furnace cabinet.
• New or newly renovated homes may require more frequent
changing or cleaning until the construction dust has minimized.
Filters designed to remove smaller particles such as pollen, may
require additional maintenance.
THERMOSTAT
• Single stage gas furnaces (M7RL series) are designed to be
controlled by a conventional single stage thermostat. Two-stage
gas furnaces (M7TL series) will perform best with a conventional
two-stage thermostat. However, it is possible to control the M7TL
furnace with a single stage thermostat. Consult with your installer
about which type is best for your installation. Both thermostats
are commonly available at your local building supply store.
• The thermostat’s wiring must comply with the current provisions of
the NEC (ANSI/NFPA 70) and with applicable local codes having
jurisdiction. Thermostat connections should be made according
to the instructions supplied with the thermostat and the indoor
equipment.
• The thermostat should be mounted about 5 feet above the floor
on an inside wall and not on an outside wall or other location
where its operation may be adversely affected by radiant heat
from fireplaces, sunlight, or lighting fixtures, and convective heat
from warm air registers or electrical appliances.
• Thermostat styles vary. Please refer to the thermostat
manufacturer’s User Manual for detailed programming instructions.
FURNACE IN A SMALL ROOM OR CLOSET
If a furnace is installed in relatively small utility room or closet, the
installation needs openings in the walls or door to let return air
in. Make sure that these openings remain unobstructed. Do not
modify these openings in any way without consulting a licensed
HVAC technician.
SOURCES OF CORROSION
It is known that certain common household chemicals can cause
heat exchanger corrosion if the vapors are pulled into the furnace’s
burners The following is a list of chemicals that should not be used
or stored near the furnace.
Do not store these chemicals near the furnace:
• Gasoline/Kerosene
• Permanent wave solutions
• Chlorinated waxes and cleaners
• Chlorine based swimming pool chemicals
• Water softening chemicals
• De-icing salts or chemicals
• Carbon tetrachloride
• Halogen type refrigerants
• Cleaning solvents (perchloroethylene)
• Printing inks, paint removers, varnishes, etc.
• Hydrochloric acid
• Cements and glues
• Antistatic fabric softeners
• Masonry acid washing materials
WARRANTY INFORMATION
A warranty certificate with full details is included with the equipment.
Carefully review these responsibilities with your dealer or service
company. The manufacturer will not be responsible for any costs
found necessary to correct problems due to improper setup, improper
installation, adjustments, improper operating procedure on the part
of the user, Some specific examples of service calls which are not
included in the limited warranty are:
• Correcting wiring problems in the electrical circuit supplying the
equipment.
• Resetting circuit breakers or other switches.
• Adjusting or calibrating of thermostat.
GENERAL INFORMATION
