6
If the cause for the failure to
operate is not obvious, do not
attempt to service the furnace
yourself. Call a qualified serv-
ice agency or your gas sup-
plier.
Filters
It is very important that filters in
your furnace or air conditioning
system be cleaned frequently or
replaced when necessary. Clean
filters not only provide added com-
fort and a more healthful environ-
ment, but also allow the system to
operate more efficiently.
Check
filters every two or three weeks.
Your furnace may be equipped with
a permanent type filter, which need
not be replaced provided it is
cleaned frequently. A permanent
filter may be washed in a mild solu-
tion of detergent and water and
then rinsed thoroughly with clear
water. If the pores of the filter me-
dia become clogged with dirt or lint,
which cannot be washed out, or
if the filter becomes damaged, it
must be replaced. A replace-
ment filter should be of the
same type and the same size as
the old filter.
Filter Replacement –
Downflow
In your installation the filter may
be located in the return air duct
above the furnace as shown in
Figure 5, or it may be located
behind a return air grille.
If the filter is located in the re-
turn air duct above the furnace,
replace the filters as shown in
Figure 5, with the bottom of the
filter resting in the filter rack and
the top edges of the filters
leaning against the inside of the
duct. If the filter is not located in
the return air duct above the
furnace or if the method of re-
moval and replacement is not
obvious, then contact the in-
stalling contractor of the furnace
for assistance.
Filter Replacement –
Horizontal
The filter may be located in a
filter rack near the furnace, or it
may be located behind a return
air grille. If you cannot find the
filter, or if the method of removal
and replacement is not obvious,
then contact the installing con-
tractor of the furnace for assis-
tance.
Filter Replacement –
Upflow
The filter may be located in a
filter rack attached to the side of
the furnace or it may be located
in a filter rack beneath the fur-
nace. See Figure 6. If the filter is
not located in one of these
places, or if the method of re-
moval and replacement is not
obvious, then contact the in-
stalling contractor of the furnace
for assistance.
FIGURE 5 – DOWNFLOW FILTERS
FIGURE 6 – UPFLOW FILTERS
