Filter
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many applications, the installer will provide return air filter grilles
mounted on the wall or ceiling of the conditioned structure. In the
instance of filter grilles, the filters can simply be removed from the
grille and replaced.
The other typical application is an accessory filter rack installed
inside the unit itself. The following information is given to assist in
changing filters used in these internal filter racks.
Table 1 indicates the correct indoor filter size for your unit. Refer
to Fig. 3 to access filters installed in the accessory filter rack. If
using an Accessory Filter Rack, refer to the Installation Instructions
provided with it for correct filter sizes and quantities.
Table 1 – Air Filters Located Inside Unit
(For Replacement Purposes)
Unit Size Filter Size in. (mm)
A24 20x20x1 (508x508x25)
A30 20x24x1 (508x610x25)
A36---A42 24x30x1 (610x762x25)
A48---A60 24x36x1 (610x914x25)
To replace or inspect filters in accessory filter rack:
1. Remove the filter access panel (See Fig. 3) using a 5/16--in.
nut driver.
2. Remove the filter(s) by pulling it out of the unit. If the
filter(s) is dirty, clean or replace with a new one.
When installing t he new filter(s), note the direction of the airflow
arrows on the filter frame.
If you have difficulty locating your air filter(s) or have questions
concerning proper filter maintenance, contact your dealer for
instructions. When replacing filters, always use the same size and
type of filter that was supplied originally by the installer.
Access Panels
Filter Access Panel
For Accessory Filter Rack
A09044
Fig. 3 -- Accessory Filter Rack Access Panel
FIRE AND UNIT OPERATION HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
Never operate your unit without filters in place. An
accumulation of dust and lint on internal parts of your unit
can cause loss of efficiency.
!
WARNING
RETURN
DUCT COVER
(Remove for
lter access)
SMALL CHASSIS
A10063
Fig. 4 -- Small Chassis Filter Access
LARGE CHASSIS
FILTER
ACCESS
PANEL
A10062
Fig. 5 -- Large Chassis Filter Access
Replacing or inspecting filters in units with econom-
izers
Small Chassis (See Fig. 4)
1. Remove return air duct cover at rear of unit using a 5/16-- in.
nut driver.
2. Remove the filter(s) by pulling it out and through the unit
duct opening. If filter is dirty, replace both filters with new
ones.
When installing the new filters, note the direction of the airflow
arrows on the filter frame, which should be pointing at the indoor
coil.
3. Reinstall duct cover ensuring opening is air and water tight.
Large Chassis (See Fig. 5)
1. Remove filter access door using a 5/16-- in. nut driver.
2. Remove the filter(s) by pulling it out and through the unit
filter access door. If filter i s dirty , replace both filters with
new ones.