Unit installation

14
Remember dirty filters are the most common cause of
inadequate heating or cooling performance.
NOTE: If using Media Air Cleaner MAC1 or Electronic Air
Cleaner EAC5, follow the directions that came with the air
cleaner for proper filter removal, cleaning, and replace-
ment procedures.
The filters should be inspected and cleaned or changed
every two months or as required. In some installations,
the filters can be inspected and cleaned or changed after
disconnecting the electrical power and removing the
optional access door in the return air plenum. If the
installation does not have an access door proceed as
follows:
1. Disconnect the electrical power.
2. Remove the upper door from the furnace.
3. Remove the left filter first by reaching to the left side
of the blower, pushing the filter up slightly to remove it
from the filter rack. Then carefully pull the filter down
past the left side of the blower housing. Be careful
not to dislodge any trapped dirt or debris from the fil-
ter (Figure 11).
4. Remove the right filter by reaching to the left side of
the blower. Lift filter up slightly to remove it from the
filter rack. Move the filter to the left side of the return
air plenum, and down past the left side of the blower
housing. Be careful not to dislodge any trapped dirt or
debris from the filter (Figure 11).
a. Some installations will have two throwaway filters.
If dirty, these filters must be thrown away and
replaced with two new similar size throwaway
filters.
b. Other installations will have two permanent filters.
Wash, rinse and dry dirty permanent filters. After
cleaning, both sides should be sprayed with a
filter adhesive (available in hardware stores) as
instructed on the adhesive container.
When badly torn or uncleanable, permanent filters
must be replaced with permanent filters of the
same type and size.
5. To reinstall the filters, first MAKE CERTAIN THE AIR-
Routine Maintenance
FLOW DIRECTION ARROW POINTS TOWARDS
THE FURNACE. Then insert the filters from the left
side of the blower. Starting with the right filter, push
the filter into the plenum so that the bottom of the fil-
ter rests in the filter rack and the upper edge rests
against the side of the plenum. Repeat with the left
filter (Figure 11).
6. Replace the air circulation blower door, then recon-
nect the electrical power.
Horizontal Filters (Not Included With Furnace)
For furnaces installed horizontally, filters must be in-
stalled external to the furnace casing. A central return
with filters installed in the duct behind the return grille
may be used. This would simplify filter replacement by
merely requiring the removal of the grille. Clean or
replace filters every two months or sooner as required.
Dirty filters are the most common cause of inadequate
heating or cooling performance.
NOTE: If using Media Air Cleaner MAC1 or Electronic Air
Cleaner EAC5, follow the directions that came with the air
cleaner for proper filter removal, cleaning, and replace-
ment procedures.
Induced Draft Motor Lubrication
The induced draft motor bearings are permanently
lubricated. No further lubrication is required.
Air Circulating Blower Motor Lubrication
The air circulation blower motor bearings are perma-
nently lubricated. No further lubrication is required.