3. | Check electrical connections for tightness and controls for |
| BLOWER MOTOR AND WHEEL |
| proper operation each heating season. Service as necessary. |
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4. | Inspect burner compartment before each heating season for | → |
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| rust, corrosion, soot or excessive dust. If necessary, have | Blower access door switch opens | |
| furnace and burner serviced by a qualified professional. |
| component operation can occur unless switch is closed. |
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5. | Inspect the vent pipe/vent system before each heating season |
| Caution must be taken when manually closing this switch for |
| for rust, corrosion, water leakage, sagging pipes or broken |
| service purposes. Failure to follow this warning could result |
| fittings. Have vent pipes/vent system serviced by a qualified |
| in personal injury or death. |
| professional. |
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6.Inspect any accessories attached to the furnace such as a humidifier or electronic air cleaner. Perform any service or
maintenance to the accessories as recommended in the acces- | The blower wheel should not be dropped or bent as balance | |
will be affected. | ||
sory instructions. | ||
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CLEANING AND/OR REPLACING AIR FILTER | The following steps should be performed by a qualified service | |
The air filter arrangement may vary depending on the application. | technician. | |
| ||
The filter is exterior to the furnace casing. | To ensure long life and high efficiency, clean accumulated dirt and | |
NOTE: If the filter has an airflow direction arrow, the arrow must | grease from blower wheel and motor annually. | |
The inducer and blower motors are | ||
point towards the blower. | ||
| additional lubrication. These motors can be identified by the | |
| absence of oil ports on each end of the motor. |
Personal injury can result from sharp metal edges, etc. Be careful when removing parts. Gloves and safety glasses should be worn when servicing equipment
Media cabinet filter procedures:
NOTE: Media cabinet or 1″ Filter Rack are accessories and are not included from the factory with the standard furnace model.
1.Turn off electrical supply to furnace before removing filter access door.
2.Remove filter cabinet door.
3.Slide filter out of cabinet.
4.If equipped with permanent, washable 1″ 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. See Table 9 for size information.
5.If equipped with
6.Slide filter into cabinet.
7.Replace filter cabinet door.
8.Turn on electrical supply to furnace.
Table 9—FILTER SIZE INFORMATION (IN.)
FURNACE | FILTER QUANTITY AND SIZE | FILTER | |
CASING WIDTH | Side Return | Bottom Return | TYPE |
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(1) 16 X 25 X 1 | (1) 14 X 25 X 1 | Cleanable* | |
(1) 16 X 25 X 1 | (1) 16 X 25 X 1 | Cleanable* | |
21 | (1) 16 X 25 X 1 | (1) 20 X 25 X 1 | Cleanable* |
24** | (1) 16 X 25 X 1 | (1) 24 X 25 X 1 | Cleanable* |
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*Recommended
**Some furnaces may have 2 filters
Clean blower motor and wheel as follows:
1.Turn off electrical supply to furnace.
2.Unscrew the thumbscrew on outer door and remove outer door.
3.For downflow or horizontal furnaces having vent pipes within the furnace that pass in from of the blower access door:
a.Disconnect vent connector from furnace vent elbow.
b.Disconnect and remove short piece of vent pipe from within furnace.
4.Remove 2 screws from blower access door and remove blower access door.
5.Disconnect blower leads from furnace control. Note wire color and location for reassembly. All other factory wires can be left connected, but field thermostat connections may need to be disconnected depending on their length and routing.
6.Remove 2 screws from control box to blower shelf.
7.Hang control box from front of furnace casing and away from blower compartment.
8.Remove 2 screws holding blower assembly to blower deck and slide blower assembly out of furnace.
9.Clean blower wheel and motor using a vacuum with soft brush attachment. Blower wheel blades may be cleaned with a small paint or flux brush. Do not remove or disturb balance weights (clips) on blower wheel blades.
10.Vacuum any loose dust from blower housing, wheel and motor.
11.If a greasy residue is present on blower wheel, remove wheel from the blower housing and wash it with an appropriate degreaser. To remove wheel:
NOTE: Before disassembly, mark blower motor, and blower housing so motor and each arm is positioned at the same location during reassembly.
a. Disconnect capacitor wires and ground wire attached to blower housing.
b. Remove screws securing cutoff plate and remove cutoff plate from housing.
c.Loosen set screw holding blower wheel on motor shaft.
d.Remove bolts holding motor to blower housing and slide motor out of wheel.
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