Carrier 48EZ(N)-A Maintenance, Air Filter, Indoor Blower and Motor, 48EZ --A, Cut Hazard

48EZ -- A

MAINTENANCE

To ensure continuing high performance and to minimize the possibility of premature equipment failure, periodic maintenance must be performed on this equipment. This combination heating/cooling unit should be inspected at least once each year by a qualified service person. To troubleshoot cooling or heating of units, refer to Tables 12, 13 and 14.

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

!WARNING

PERSONAL INJURY AND UNIT DAMAGE HAZARD

Failure to follow this warning could result in personal injury or death and unit component damage.

The ability to properly perform maintenance on this equipment 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 Owner’s Manual.

!WARNING

ELECTRICAL SHOCK AND EXPLOSION HAZARD

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

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

2.Use extreme caution when removing panels and parts.

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

4.Should overheating occur or the gas supply fail to shut off, turn off external main manual gas valve to the unit. Then shut off electrical supply.

!CAUTION

CUT HAZARD

Failure to follow this caution may result in personal injury.

When removing access panels (see Fig. 18) 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.

!CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in improper operation.

Errors made when reconnecting wires may cause improper and dangerous operation. Label all wires prior to disconnecting when servicing.

The minimum maintenance requirements for this equipment are as follows:

1.Inspect air filter(s) each month. Clean or replace when necessary. Certain geographical locations may require more frequent inspections.

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

3.Inspect blower motor and wheel for cleanliness at the beginning of each heating and cooling season. Clean when necessary. For first heating and cooling season, inspect blower wheel bi-monthly to determine proper cleaning frequency.

4.Check electrical connections for tightness and controls for proper operation each heating and cooling season. Service when necessary. Ensure electrical wiring is not in contact with refrigerant tubing or sharp metal edges.

5.Check and inspect heating section before each heating season. Clean and adjust when necessary.

6.Check flue hood and remove any obstructions, if necessary.

Air Filter

IMPORTANT: Never operate the unit without a suitable air filter in the return-air duct system. Always replace the filter with the same dimensional size and type 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 heating and cooling season or whenever the filter(s) becomes clogged with dust and/or lint.

Indoor Blower and Motor

NOTE: All motors are prelubricated. Do not attempt to lubricate these motors.

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

!WARNING

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 and lubricating the blower motor and wheel.

Cleaning the Blower Motor and Wheel

1.Remove and disassemble blower assembly as follows:

a.Remove blower access panel (see Fig. 18).

b.Disconnect 5 pin plug and 4 pin plug from indoor blower motor. Remove capacitor if required.

c.On all units, remove blower assembly from unit. Remove screws securing blower to blower partition and slide assembly out. Be careful not to tear insulation in blower compartment.

d.Ensure proper reassembly by marking blower wheel and motor in relation to blower housing before disassembly.

e.Loosen setscrew(s) that secures wheel to motor shaft. Remove screws that secure motor mount brackets to housing, and slide motor and motor mount out of housing.

2.Remove and clean blower wheel as follows:

a.Ensure proper reassembly by marking wheel orientation.

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

c.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 soft brush attachment. Remove grease and oil with mild solvent.

d.Reassemble wheel into housing.

e.Reassemble motor into housing. Be sure setscrews are tightened on motor shaft flats and not on round part of shaft. Reinstall blower into unit. Reinstall capacitor.

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