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.
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.
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
!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.
| FREQUENCY | OF MAINTENANCE |
|
MAINTENANCE ITEM | BEGINNING OF | END OF EACH |
|
| EACH HEATING SEASON | HEATING SEASON | MONTHLY |
VERIFY FURNACE AREA IS FREE | X | X | X |
OF COMBUSTIBLE MATERIALS | |||
|
|
|
|
VERIFY COMBUSTION AND VENTILATION | X | X | X |
AIR IS NOT RESTRICTED | |||
|
|
|
|
VERIFY NO SIGNS OF PHYSICAL | X | X | X |
DETERIORATION OF THE FURNACE | |||
|
|
|
|
VERIFY NO OBSTRUCTIONS OR | X | X |
|
RESTRICTIONS IN VENT OR CHIMNEY |
| ||
|
|
|
|
VERIFY NO HOLES OR CRACKS IN VENT PIPE | X | X |
|
|
|
|
|
VERIFY NO CORROSION IN VENT PIPE | X | X |
|
|
|
|
|
VERIFY THAT HORIZONTAL VENT PIPES | X | X |
|
SLOPE UPWARDS AWAY FROM FURNACE |
| ||
|
|
|
|
VERIFY BURNER FLAME | X |
|
|
|
|
|
|
CLEAN OR REPLACE FILTER(S) |
|
| X |
|
|
|
|
CLEAN BLOWER COMPARTMENT |
|
| X |
|
|
|
|
CLEAN BURNER ASSEMBLY | X |
|
|
|
|
|
|
Table 1. Maintenance Table
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