Carrier 50GL-A manual Maintenance and Care for the Equipment Owner, Indoor Air Filter Data

the unit is 48 in. (1219 mm). Clearance of at least 36 in.(914 mm) is required on sides except the power entry side (42 in. [1067 mm] clearance) and the duct side (12 in. [305 mm] minimum clearance).

Maintenance and Care for the Equipment Owner

Before proceeding with those things you might want to maintain 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 ELECTRICAL POWER TO YOUR UNIT BEFORE SERVICING OR PERFORMING 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, glove, 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 exces- sive 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 ap- plications, 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 re- placed.

The other typical application is an accessory filter rack installed in- side 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. 2 to access filters installed in the accessory filter rack. If using an Accessory Filter Rack, refer to the Installation Instructions pro- vided with it for correct filter sizes and quantities.

Table 1—Indoor Air Filter Data

Unit Size	Filter Size in. (mm)
24	20x20x1 (508x508x25)
30	20x24x1 (508x610x25)
36	24x30x1 (610x762x25)
48	24x36x1 (610x914x25)

To replace or inspect filters in accessory filter rack (See Fig. 2):

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 ar- rows on the filter frame.

If you have difficulty locating your air filter(s) or have questions concerning proper filter maintenance, contact your dealer for in- structions. When replacing filters, always use the same size and type of filter that was supplied originally by the installer.

!CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in 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 and blower motor and/or compressor damage.

Filter Access
Panel For
Accessory Filter	Access Panels
Rach

A09380

Fig. 2 - Accessory Filter Rack Access Panel

Fans and Fan Motors

Periodically check the condition of fan wheels and housings and fan-motor shaft bearings. Contact your dealer for the required annual maintenance.

Indoor and Outdoor Coils

Cleaning of the coils should only be done by qualified service per- sonnel. Contact your dealer for the required annual maintenance.

Condensate Drain

The drain pan and condensate drain line should be checked and cleaned at the same time the cooling coils are checked by your deal- er.

Compressor

All compressors are factory shipped with a normal charge of the cor- rect type of refrigeration grade oil. A compressor should rarely re- quire additional oil.

Condenser Fan

!WARNING

PERSONAL INJURY AND UNIT DAMAGE HAZARD

Failure to follow this warning could result in personal injury, death or property damage.

Do not poke sticks, screwdrivers, or any other object into revolving fan blades.

The fan must be kept free of all obstructions to ensure proper cool- ing. Contact your dealer for any required service.

Electrical Controls and Wiring

Electrical controls are difficult to check without proper instrumenta- tion. If there are any discrepancies in the operating cycle, contact your local dealer and request service.

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