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FURNACE MAINTENANCE
it is recommended .that you have your furnace in-
spected and serviced on an annual basis (before the
heating season) by a quaUfied service technician.
You may perform maintenance on the furnace
yourself, but remember that certain mechanical and
electrical skills and tools are required to properly per-
form maintenance on the furnace. Personal iniury or
death may result if you are not properly trained. You
should call your installing dealer or place of purchase
if you are uncertain about your ability to perform
maintenance, ,'
Filter Replacement
The fitter will normaliy be found inside the furnace
blower compartment, see pages 5 and 6, but alter-
nate locations may be a remote filter rack attached
to the outside of the furnace, a separate return air
cabinet attached to furnace or a remote filter grille.
Remote filter grilles and return air cabinets wil! usual-
ly have a hinged door or removable panel to be able
to remove filter. Filter racks attached to the furnace
will usually be made so the filter simply slides out one
side for removal. Use only the same size filter. The
type must be the same unless replacing a disposable
tow velocity type, with a washable high velocity type.
AIR FILTERS -- Monthly
The air fi!ter(s) should be inspected at least monthly
and cleaned or replaced as required. There are two
types of filters most commonly used. The most widely
used is the fiberglass disposable type which should
be replaced before it becomes clogged. The other type
commonly in use is the washable type constructed of
aluminum mesh, foam, or reinforced fibers. Washable
filters may be cleaned by soaking in mild detergent
and rinsing with water.
, NOTE ....
Some filters are marked with an arrow to indicate
the proper direction of air flow through the filter.
"When installing the arrow must point in the direc-
tion of the air flow. Remember that dirty fitters
are the most common cause of inadequate
heating or coo}ing performance.
. immm
The table on page 10 lists recommended sizes and
types of filters that may be used with your furnace,
based on the input rating and nominal tons of air con-
ditioning that may be used with the furnace.
However, the furnace installer may have used a larger
filter for additional air volume or if the furnace was
installed for Heating Only with a remote filter cabinet
or central return he may have installed a smaller filter.
If air conditioning has been added since your furnace
was installed, make sure the filter size is adequate.
Replacement filters should be of the same type and
size to ensure adequate air flow and filtering, unless
a disposable low velocity filter is replaced with a
washable high velocity type.
Filter Replacement/Upflow (Hi-Boy)
See Figure 4
1. Turn off electric power for furnace at circuit
breaker or disconnect switch.
.
3.
.
.
6.
7.
FIGURE 4
Remove blower compartment door.
Pull back on filter clip and remove filter being
careful not to dislodge dirt and debris from filter.
Inspect filter and replace or clean washable type.
If filter is aluminum mesh it should be recoated
wit.h filter coating spray.
Reinstall filter under clips. If filter is marked for air
flow direction make sure it's insta$1ed correctly.
Replace blower compartment door making sure
that it's tightly closed.
Turn on electric power for the furnace.
FILTER REPLACEMENT
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