Carrier 50ZH024-060 ÐAir Filter, ÐUnit Top Removal Outdoor-Coil Side, ÐIndoor Blower and Motor

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

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. FAILURE TO HEED THIS WARNING COULD RESULT IN SERI- OUS INJURY, DEATH OR DAMAGE TO THIS EQUIP- MENT.

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.

Failure to follow these warnings could result in serious injury or death:

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 1ÐAir 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 1 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 2ÐUnit 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.

Disconnect and tag electrical power to the unit before removing top. Failure to adhere to this warning could cause serious injury or death.

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

Refer to the following top removal procedures:

1.Remove 7 screws on unit top cover surface. (Save all screws.)

2.Remove 2 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 3ÐIndoor Blower and Motor

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

Disconnect and tag electrical power to the unit before cleaning the blower wheel. Failure to adhere to this warning could cause serious injury or death.

To clean the blower wheel:

1.Access the blower assembly as follows:

a.Remove top access panel.

b.Remove 3 screws that hold blower orifice ring to blower housing. Save screws.

c.Loosen setscrew(s) which secure wheel to motor shaft.

2.Remove and clean blower wheel as follows:

a.Lift wheel from housing. When handling and/or cleaning blower wheel, be sure not to disturb balance weights (clips) on blower wheel vanes.

b.Remove caked-on dirt from wheel and housing with a brush. Remove lint and/or dirt accumulations from wheel and housing with vacuum cleaner, using a soft brush attachment. Remove grease and oil with a mild solvent.

c.Reassemble blower into housing. Place upper orifice ring on blower to judge location of the blower wheel. Blower wheel should be approximately 0.2-in. below bottom of orifice ring when centered correctly. Be sure setscrews are tightened on motor and are not on round part of shaft.

d.Set upper orifice ring in place with 3 screws removed in step 1.

e.Replace top access panel.

Step 4ÐOutdoor Coil, Indoor Coil, and Condensate Drain Pan

Inspect the outdoor coil, indoor coil, and condensate drain pan at least once heating and cooling season. Proper inspection and cleaning requires the removal of the unit top. See Unit Top Removal section above.

Remove all obstructions (including weeds and shrubs) that inter- fere with the airflow through the outdoor coil. Straighten bent fins with a fin comb. If coated with dirt or lint, clean the coils with a vacuum cleaner, using a soft brush attachment. Be careful not to bend the fins. If coated with oil or grease, clean the coils with a

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