7
90
STEP 1
STEP 2
C
L
O
S
E
STEP 3
OFF
ON
MAIN
A07797
Fig. 8 -- To Shut--off Unit Electric Cooling
Maintenance and Care for the Equipment Owner
Before performing equipment maintenance yourself, please
carefully consider the following:
FIRE, EXPLOSION, ELECTRICAL SHOCK AND
CUT HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
1. Turn off gas supply first, then all electrical power to your
unit and install lock--out tag before servicing or per-
forming maintenance.
2. When removing access panels or performing
maintenance functions inside your unit, be aware of
sharp sheet metal parts and screws. Although special care
is taken to reduce sharp edges to a minimum, be
extremely careful when handling parts or reaching into
the unit. Wear safety glasses, gloves, and appropriate
protective clothing.
!
WARNING
Air Filters
The air filter(s) should be checked every 3 or 4 weeks and
changed or cleaned whenever it becomes dirty. Dirty filters
produce excessive stress on the blower motor and can cause the
motor to overheat and shut down.
This unit must have air filters in place before it can be operated.
These filters can be located in one of at least two places. In 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 – Indoor Air Filter Data
Unit Size Filter Size
24040 20x20x1 (508x508x25 mm)
24060, 30 20x24x1 (508x610x25 mm)
36 --- 42 24x30x1 (610x762x25 mm)
48 --- 60 24x36x1 (610x914x25 mm)
To replace or inspect filters in accessory filter rack (See Fig. 3):
1. Remove the filter access panel 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, c lean or replace with a new one.
When installing the new filter(s), note t he direction of the airflow
arrows on the filter frame which should be pointing at the indoor
coil.
3. Reinstall filter access panel ensuring opening is air and
water tight.
If you have difficulty locating your air filter(s) or have questions
concerning proper filter maintenance, contact your dealer for
instructions. When replacing filters, a lways use the s ame s ize and
type of filter that was supplied originally by the installer.
Replacing or inspecting filters in units with econom-
izers
Small Chassis (See Fig. 9)
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 f ilters, 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 watertight.
Table 2 – Indoor Air Filter Data with Economizer
Unit Size Filter Size
30-040/060
2each20x12x1
(508 x 305 x 25 mm)
36-060/090
2each20x12x1
(508 x 305 x 25 mm)
42-060/090
1 each 24 x 14 x 1 (610 x 356 x 25 mm),
24 x 16 x 1 (610 x 406 x 25 mm)
48-090/115/130
1 each 24 x 14 x 1 (610 x 356 x 25 mm),
24 x 16 x 1 (610 x 406 x 25 mm)
60-090/115/130*
1 each 24 x 16 x 1 (610 x 406 x 25 mm),
24 x 18 x 1 (610 x 457 x 25 mm)
*Units with be nt indoor coil.
Large Chassis (See Fig. 10)
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 is dirty, replace both filters with
new ones.
Units with bent indoor coils, install 24 x 18 x 1 (610 x 457 x 25
mm) filter first and then install 24 x 16x1(610x406x25)filter.
When installing the new f ilters, note the direction of the airflow
arrows on the filter frame, which should be pointing at the indoor
coil.
3. Reinstall filter access door ensuring opening is air and water
tight.
