Carrier 50ZHA024-060 FIRE, EXPLOSION, Electrical SHOCK, CUT HAZ- ARD, Air Filter

be performed on this equipment. This cooling unit should be inspected at least once each year by a qualified service person. To troubleshoot cooling of units, refer to Troubleshooting chart in back of book.

NOTE TO EQUIPMENT OWNER: Consult your local dealer about the availability of a maintenance contract.

FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury, death or property damage.

The ability to properly perform maintenance on this equip- ment requires certain expertise, mechanical skills, tools and equipment. If you do not possess these, do not attempt to perform any maintenance on this equipment, other than those procedures recommended in the User’s Manual.

The minimum maintenance requirements for this equipment are as follows:

1.Inspect air filter(s) each month. Clean or replace when necessary.

2.Inspect indoor coil, outdoor coil, drain pan, and condensate drain each cooling and heating season for cleanliness. Clean when necessary.

3.Inspect blower motor and wheel for cleanliness each cooling and heating season. Clean when necessary. For first heating season, inspect blower wheel bimonthly to determine proper cleaning frequency.

4.Check electrical connections for tightness and controls for proper operation each cooling season. Service when neces- sary.

5.Check the drain channel in the top cover periodically for blockage (leaves, insects). Clean as needed.

FIRE, EXPLOSION, ELECTRICAL SHOCK, CUT HAZ- ARD

Failure to follow these warnings could result in serious personal injury, death, and/or property damage:

1.Turn off electrical power to the unit and install lockout tag before performing any maintenance or service on the unit.

2.Use extreme caution when removing panels and parts. As with any mechanical equipment, personal injury can result from sharp edges, etc.

3.Never place anything combustible either on, or in contact with, the unit.

Step 1—Air Filter

NOTE: Never operate the unit without a suitable air filter in the return-air duct system. Always replace the filter with the same size as originally installed. See Table 2 for recommended filter sizes.

Inspect air filter(s) at least once each month and replace (throwaway-type) or clean (cleanable-type) at least twice during each cooling season or whenever the filters become clogged with dust and lint.

Replace filters with the same dimensional size and type as originally provided, when necessary.

Step 2—Unit Top Removal (Outdoor-Coil Side)

NOTE: When performing maintenance or service procedures that require removal of the unit top, be sure to perform all of the routine maintenance procedures that require top removal, including coil inspection and cleaning, and condensate drain pan inspection and cleaning.

ELECTRICAL SHOCK HAZARD

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

Disconnect and tag electrical power to the unit before removing top.

Only qualified service personnel should perform maintenance and service procedures that require unit top removal.

Refer to the following top removal procedures:

1.Remove screws on unit top cover surface. (Save all screws.)

2.Remove screws on unit top cover flange. (Save all screws.)

3.Lift top from unit carefully. Set top on edge and make sure that top is supported by unit side that is opposite duct (or plenum) side.

4.Carefully replace and secure unit top to unit, using screws removed in Steps 1 and 2, when maintenance and/or service procedures are completed.

Step 3—Indoor Blower and Motor

For longer life, operating economy, and continuing efficiency, clean accumulated dirt and grease from the blower wheel and motor annually.

ELECTRICAL SHOCK HAZARD

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

Disconnect and tag electrical power to the unit before cleaning the blower wheel.

To clean the blower wheel follow the following steps:

1.Remove the blower housing:

a.Remove the screws on the external side of the duct panel that fasten the housing to the duct panel assembly.

b.Remove the side access panel and unscrew the mounting bracket that fastens the blower housing to the internal partition panel fo the control box assembly.

c.Make sure that the blower housing is supported by hand before completely removing the mounting bracket.

d.Slide the blower housing from the rails of the duct panel and place it outside the unit.

2.Remove the blower wheel from the housing:

a.Loosen the set screw which secures the wheel to the motor shaft.

b.Loosen the three mounting legs of the motor by removing the bolts that fasten themounting legs to the housing.

c.Slide out the motor assembly (motor, belly band and the 3 mounting legs) from the hub of the wheel.

d.Remove the filler panel at the discharge end of the blower housing by removing the two screws that fasten it to the housing.

e.Remove the wheel form the housing.

3.Remove the caked on dirt from the wheel and the motor using

abrush.

4.Remove lint and dirt accumulations from the wheel and housing with a vacuum cleaner, using a soft brush attachment.

5.Remove grease and oil with a mild solvent.

6.Reassemble

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