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To maximize heat exchanger life, the combustion
air must be free of chemicals which form corrosive
acidic compounds in the combustion gases.
Some examples of these chemicals are chlorine,
fluorine, and sulphur. Some common sources of
these chemicals are detergents, bleaches,
aerosol sprays, cleaning solvents, and a wide
variety of commercial and household products.
3. Return Air Supply
In applications where the supply ducts carry
heated air to areas outside the space in which
the furnace is installed, the return air must be
delivered to the furnace by duct(s) sealed to the
furnace casing. These duct(s) must be full size
and without interruption in the spaces outside of
where the furnace is installed.
The return air duct connection(s) must be
physically sound and sealed to the furnace
casing to prevent products of combustion from
entering the living space.
The floor or platform on which the furnace is
mounted must provide sound physical support
of the furnace with no gaps, cracks, or sagging
between the furnace and floor or platform. The
return air and circulating air ductwork must not
be connected to any other heat producing device
such as a fireplace insert, stove, etc. Doing so
may result in fire, explosion, personal injury,
carbon monoxide poisoning, or property damage.
Use a type high velocity air filter in the return air
duct to maintain a clean heat exchanger.
!
WARNING:
Failure to prevent products of com-
bustion from being circulated into the
living space can create potentially
hazardous conditions including car-
bon monoxide poisoning that could
result in personal injury or death.
4. Vent System
The furnace must always be connected to an
approved vent pipe to carry the furnace
combustion products outdoors. At the beginning
and end of each heating season, inspect the
outdoor vent terminal closely with a flashlight to
determine if any of the conditions listed under
the following warning exist.
MAINTENANCE ITEM BEGINNING OF END OF EACH
EACH HEATING SEASON HEATING SEASON MONTHLY
VERIFY FURNACE AREA IS FREE
OF COMBUSTIBLE MATERIALS
XXX
VERIFY COMBUSTION AND VENTILATION
AIR IS NOT RESTRICTED
XXX
VERIFY NO SIGNS OF PHYSICAL
DETERIORATION OF THE FURNACE
XXX
VERIFY NO OBSTRUCTIONS OR
RESTRICTIONS IN VENT OR CHIMNEY
XX
VERIFY NO HOLES OR CRACKS IN VENT PIPE
XX
VERIFY NO CORROSION IN VENT PIPE
XX
VERIFY THAT HORIZONTAL VENT PIPES
SLOPE UPWARDS AWAY FROM FURNACE
XX
VERIFY BURNER FLAME
X
CLEAN OR REPLACE FILTER(S)
X
CLEAN BLOWER COMPARTMENT
X
CLEAN BURNER ASSEMBLY
X
FRE
QU
EN
C
Y
O
F MAINTENAN
C
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Table 1. Maintenance Table