Lennox B050A3B, Installation/Servicing Instructions And Users Information Manual

Page: 33 / 36

506307-01 Page 33 of 36 Issue 1207
grilles in the door, or by the introduction of outside air, or both,
in accordance with the National Fuel Gas Code, ANSI Z223.1/
NFPA 54 (latest edition) or the CSA B149.1, Natural Gas and
Propane Installation Codes, and local codes.
Adequate combustion and ventilation air must reach
the furnace to provide for proper and safe operation.
Air openings in front of furnace must be kept free of
obstructions. Any obstruction may cause improper
operation that can result in a fire hazard or carbon
monoxide injury.
WARNING
to prevent operation of the furnace until the condition has been
corrected. Contact your dealer if you desire more information
about this important safety feature.
NOTE: After any heavy snow, ice or frozen fog event
the furnace vent pipes may become restricted. Always
check the vent system and remove any snow or ice that
may be obstructing the exhaust pipes.
Should any unusual conditions be observed during your
inspections, call an authorized service dealer immediately.
Return Air
All return air duct connections must be tight and sealed to
furnace cabinet and all return air grilles or registers must
be located outside the space containing the furnace.
Cleaning/Replacing the Filter
It is very important to clean or replace the air filter regularly.
Dirty filters are the most common cause of inadequate
heating or cooling performance and can sharply increase
the operational costs of your unit. In some cases, they can
double the cost.
The air filter should be inspected at
least every 6 weeks and cleaned or replaced as required.
Your furnace may use either a disposable filter or a cleanable
filter. The type of filter may be indicated on a label attached
to the filter. If a disposable filter is used, replace with the
same type and size. To remove excess dirt from a cleanable
filter, shake filter and/or use a vacuum cleaner. Wash filter
in soap or detergent water and replace after filter is dry.
Cleanable filters do not need to be oiled after washing.
Cleanable filters may be replaced with disposable filters.
Refer to Table 1 on page 33 when selecting the proper size
and quantity of disposable filter.
If your air distribution system has a central return air filter-
grille, the furnace does not need a filter. Filter-grilles can be
maintained the same way as cleanable filters (see above).
Venting and Furnace Support
Venting of this furnace must comply with the unit Installation
Instructions. Be sure the installer has followed these
requirements. If not, you should request the installer to
comply as soon as possible.
For your safety, please note the following:
1. 80% furnaces may be common vented with another
appliance in certain circumstances. Refer to the
installation instructions and Category I Venting Tables,
National Fuel Gas Code, ANSI Z223.1/NFPA 54 (latest
edition) or the CSA B149.1, Natural Gas and Propane
Installation Codes, and local codes for proper installation
guidelines.
2. This furnace is not designed for use with a vent damper.
Use of such a device will not improve the efficiency of
this furnace.
The vent from your furnace may rise vertically and terminate
above the roof. When horizontal venting an 80% furnace, an
approved sidewall venter must be used. Refer to the Installation
Instructions for further information on horizontal venting of an
80% furnace.
Make sure all flue product materials external to the furnace
are clear and free of any obstruction, slope upward, and have
no holes or leaks. For proper venting terminations, see the
Installation Instructions furnished with the furnace.
Check to see that the furnace cabinet is sound and firmly
supported, without sagging. There should be no cracks or
gaps between the furnace and the base or floor, which would
permit entry of unfiltered air.
It is important that the outside area where the vent terminates
is kept clear of any obstructions which might block or impede
the venting of the furnace. Screens in vent terminals should
be cleaned periodically. Should venting become blocked at
anytime, your furnace is equipped with a special safety control
Table 1
Minimum Filter Requirements
BTU
INPUT
FILTER
SIZE
50,000
75,000
100,000
125,000
13 X 23
13 X 23
16 1/2 X 26
20 X 23