Bryant 120 Cleaning And/Or Replacing Air Filter, Filter size information in, 312A, Cut Hazard

CLEANING AND/OR REPLACING AIR FILTER

The air filter arrangement will vary depending on the application.

NOTE: If the filter has an airflow direction arrow, the arrow must point towards the blower.

!CAUTION

CUT HAZARD

Failure to follow this caution may result in personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing furnaces.

Media cabinet filter procedures:

NOTE: Media Cabinet is included with two-stage furnace.

Table 17 – Filter size information (in.)

FURNACE	FILTER SIZE
CASING			FILTER TYPE
	Side Return	Bottom Re-
WIDTH		turn
14--- 1/2	16 X 25 X 1	14 X 25 X 1	Cleanable*
17--- 1/2	16 X 25 X 1	16 X 25 X 1	Cleanable*
21	16 X 25 X 1	20 X 25 X 1	Cleanable*
24	16 X 25 X 1	24 X 25 X 1	Cleanable*

*Recommended

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-in 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 17 for size information.

5.If equipped with factory-specified disposable media filter, replace only with media filter having the same part number and size. For expandable replacement media, refer to the instructions included with the replacement media. If equipped with accessory KGAFR0301ALL external filter rack. See Table 17.

6.Slide filter into cabinet.

7.Replace filter cabinet door.

8.Turn on electrical supply to furnace.

BLOWER MOTOR AND WHEEL

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Blower access door switch opens 115-v power to control. No component operation can occur unless switch is closed. Caution must be taken when manually closing this switch for service purposes.

NOTE: The blower wheel should not be dropped or bent as balance will be affected.

The following steps should be performed by a qualified service agency.

To ensure long life and high efficiency, clean accumulated 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.

Clean blower motor and wheel as follows:

1.Turn off electrical supply to furnace.

2.Loosen the thumbscrew from outer door and remove outer door.

3.For downflow or horizontal furnaces having vent pipes within the furnace that pass in front 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. Record 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 holding 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 mounting arms, motor, and blower housing so motor and each arm is positioned at the same location during reassembly.

a.Disconnect capacitor wires (if equipped) 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 (160+/-20 in.-lb. when reassembling).

d.Remove bolts holding motor to blower housing and slide motor out of wheel (40+/-10 in.-lb. when reassembling).

e.Remove blower wheel from housing.

f.Clean wheel and housing.

12.Reassemble motor and blower by reversing steps 11e, through 11a. Be sure to reattach ground wire to the blower housing.

13.Verify that blower wheel is centered in blower housing and set screw contacts the flat portion of the motor shaft. Loosen set screw on blower wheel and reposition if necessary.

14.Spin the blower wheel by hand to verify that the wheel does not rub on the housing.

15.Reinstall blower assembly in furnace.

312A

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