Carrier 58MTA Series Service Manual Download

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Turn off the gas and electrical supplies to the unit before
performing any maintenance or service. Follow the operating
instructions on the label attached to the furnace. Failure to
follow this warning could result in personal injury or death.

The minimum maintenance that should be performed on this
equipment is as follows:

1. Check and clean or replace air filter each month as needed.

2. Check blower motor and wheel for cleanliness annually.

3. Check electrical connections for tightness and controls for

proper operation each heating season. Service as necessary.

4. Check for proper condensate drainage. Clean as necessary.

5. Check for blockages in combustion-air and vent pipes annu-

ally.

6. Check burners for cleanliness annually.

Be careful with sharp metal edges, etc. Use care and wear
protective clothing, safety glasses, and gloves when removing
parts. Failure to follow this caution could result in personal
injury.

Step 1—Cleaning and/or Replacing Air Filter

The air filter arrangement may vary depending on the application
or orientation. Filter could be located in furnace blower compart-
ment or in the filter cabinet, but not in both.

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

Operating a unit without a filter or with the blower access
door removed could cause damage to the furnace blower
motor. Dust and lint on internal parts of furnace can cause a
loss of efficiency.

NOTE:

If the filter has an airflow direction arrow, the arrow must

point toward the blower.

To clean or replace filters, proceed as follows:

If filter is installed in filter cabinet adjacent to furnace:

1. Turn off electrical supply to furnace.

2. Remove filter cabinet door.

3. Slide filter out of cabinet.

4. If equipped with permanent, washable filter, clean filter by

spraying cold tap water through filter in opposite direction of
airflow. Rinse filter and let dry. Oiling or coating of the filter
is not recommended.

5. If equipped with factory specified disposable media filter,

replace only with a factory-authorized filter of the same size.

6. Slide filter into cabinet.

7. Replace filter cabinet door.

8. Turn on electrical supply to furnace.

If filter is installed in furnace blower compartment:

1. Turn off electrical supply to furnace.

2. Remove main furnace door and blower access door.

3. Release filter retainer wire. (See Fig. 3 or 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 filter is not

recommended.

7. Slide filter into furnace.

8. Recapture filter retainer wire.

9. Replace blower access door and main furnace door.

10. Turn on electrical supply to furnace.

Step 2—Blower 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.

WASHABLE
FILTER

FILTER
SUPPORT

FILTER
RETAINER

WASHABLE FILTER OR
DISPOSABLE MEDIA FILTER
IN FILTER CABINET

A00232

Fig. 3—Bottom Filter Arrangement

FILTER
RETAINER

WASHABLE

FILTER