Cleaning And/Or Replacing Air Filter; Blower Motor And Wheel Maintenance - Carrier 58MSA Service And Maintenance Instructions

FILTER
SUPPORT
Fig. 3—Bottom Filter Arrangement
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.
Personal injury could result from sharp metal edges, etc. Use
care and wear protective clothing safety glasses, and gloves
when removing parts.
Step 1—Cleaning 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.
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 cross-mesh binding, the binding must face
the blower. If the filter has an air direction arrow, the arrow must
point toward the blower.
To clean or replace filters, proceed as follows:
WASHABLE
FILTER
FILTER
RETAINER
A93046
WASHABLE
FILTER
Fig. 4—Filter Installed for Side Inlet
1. Turn off electrical supply to furnace.
2. Remove main furnace door and blower access panel.
3. Release filter retainer wire. (See Figs. 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 panel 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.
2. Remove main furnace door and blower access panel.
3. Disconnect blower wires from furnace control board.
Field thermostat connections may need to be disconnected
depending on their length and routing.
4. Remove control box mounting screws, and 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: (See top-left of Fig. 8.)
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.
3
FILTER
RETAINER
A93045