Carrier 48VL-A, 48ES---A manual Maintenance and Care for the Equipment Owner, Air Filters

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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:

!WARNING

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.

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, clean or replace with a new one.

When installing the new filter(s), note the 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, always use the same size 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 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 watertight.

Table 2 – Indoor Air Filter Data with Economizer

Unit Size	Filter Size
30-040/060	2 each 20 x 12 x 1
	(508 x 305 x 25 mm)
36-060/090	2 each 20 x 12 x 1
	(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 bent 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 16 x 1 (610 x 406 x 25) filter.

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 filter access door ensuring opening is air and water tight.

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