Carrier 58MXA ÐCleaning and/or Replacing Air Filter, ÐBlower Motor and Wheel Maintenance

WASHABLE

FILTER

FILTER

FILTER RETAINER

SUPPORT

A93046

Fig. 3ÐBottom Filter Arrangement

Step 1ÐCleaning and/or Replacing Air Filter

The air filter arrangement may vary depending on the application or orientation.

Never operate unit without a filter or with the blower access panel removed. Failure to follow this warning could result in a fire or personal injury.

To clean or replace the filters, proceed as follows:

1.Turn off electrical supply to furnace.

2.Remove main furnace door and blower access panel.

3.Release filter retainer wire. (See Fig. 3 and 4.)

4.Slide filter out of furnace.

5.Furnaces are equipped with permanent, washable filter(s). Clean filter by spraying cold tap water through filter in opposite direction of airflow.

6.Rinse filter and let dry. Oiling or coating of filter is not recommended.

7.Place filter in furnace.

8.Replace blower access panel and main furnace door.

9.Turn on electrical supply to furnace.

NOTE: If the filter has cross-mesh binding, the binding must face the blower. If the filter has an air direction arrow, the arrow must point toward the blower.

Step 2ÐBlower Motor and Wheel Maintenance

To ensure long life, economy, and high efficiency, clean accumu- lated dirt and grease from blower wheel and motor annually.

The inducer and blower motors are pre-lubricated and require no additional lubrication. These motors can be identified by the absence of oil ports on each end of the motor.

The following items should be performed by a qualified service technician.

Clean blower motor and wheel as follows:

1.Turn off electrical supply to furnace.

2.Remove main furnace door and blower access panel.

3.Disconnect wires.

WASHABLE

FILTER

FILTER

RETAINER

A93045

Fig. 4ÐFilter Installed for Side Inlet

All factory wires can be left connected, but field thermostat connections may need to be disconnected depending on their length and routing.

4.Position control box, transformer, and door switch assembly to right side of furnace casing.

5.If condensate trap is located in left- or right-hand side of furnace casing, proceed to item 6, otherwise remove trap and tubing as described below.

a.Disconnect field drain connection from condensate trap.

b.Disconnect drain and relief port tubes from condensate trap.

c.Remove condensate trap from blower shelf.

6.Remove screws securing blower assembly to blower shelf and slide blower assembly out of furnace.

7.Clean blower wheel and motor by using a vacuum with soft brush attachment. Be careful not to disturb balance weights (clips) on blower wheel vanes. Do not bend wheel or blades as balance will be affected.

8.If greasy residue is present on blower wheel, remove wheel from the blower housing and wash it with an appropriate degreaser. To remove wheel:

a.Mark blower wheel location on shaft before disassembly to ensure proper reassembly.

b.Loosen setscrew holding blower wheel on motor shaft. NOTE: Mark blower mounting arms and blower housing so each arm is positioned at the same hole location during reassembly.

c.Mark blower wheel orientation and cutoff plate location to ensure proper reassembly.

d.Remove screws securing cutoff plate and remove cutoff plate from housing.

e.Remove bolts holding motor mounts to blower housing and slide motor and mounts out of housing. Disconnect capaci- tor and ground wire attached to blower housing before removing motor.

f.Remove blower wheel from housing.

g.Clean wheel per instructions on degreaser cleaner.

9.Reassemble motor and blower wheel by reversing items 8b through 8f. Ensure wheel is positioned for proper rotation. Be sure to reattach ground wire.

10.Reinstall blower assembly in furnace.

3