Bryant 393AAV instruction manual II. Blower Motor and Wheel, Ð3Ð, Ðspeed Selector

b.Remove filter cabinet door.

c.Slide filter out of cabinet.

d.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.

e.If equipped with factory-specified disposable media filter, replace only with media filter having the same part number and size.

f.Slide filter into cabinet.

g.Replace filter cabinet door.

h.Turn on electrical supply to furnace.

2.Filters installed in side(s) and/or bottom of blower compart- ment (See Fig. 2)

a.Disconnect electrical power before removing access doors.

b.Remove blower and control access doors.

c.Release filter retainer from clip at front of furnace casing. (See Fig. 2.) For side return, clips may be used on either or both sides of the furnace.

d.Slide filter(s) out.

e.Furnaces are equipped with permanent, washable filters. Clean filters with tap water. Spray water through filter in opposite direction of airflow.

f.Rinse and let dry. Oiling or coating of filter is NOT recommended or required.

g.Reinstall filter(s)

h.Replace blower and control access doors

i.Restore electrical power to furnace.

II.BLOWER MOTOR AND WHEEL

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

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.

Clean blower motor and wheel as follows:

1.Turn off electrical supply to furnace.

2.Remove control and blower access door.

3.Disconnect blower leads from furnace control. Notice wire color and location for reassembly.

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

4.Remove 2 screws securing control and transformer support to furnace.

5.Hang control and transformer support to side of furnace casing.

6.Remove screws holding blower assembly to blower deck and slide blower assembly out of furnace.

7.Clean blower wheel and motor using a vacuum with soft brush attachment. Do not remove or disturb balance weights (clips) on blower wheel blades. The blower wheel should not be dropped or bent as balance will be affected.

8.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:

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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, motor, and blower housing so motor and each arm is positioned at the same 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 and motor mounts to blower housing and slide motor and mounts out of housing. Disconnect capacitor and ground wire attached to blower housing before removing motor. Motor mount belly band need not be removed unless motor is to be replaced.

f.Remove blower wheel from housing.

CAUTION: The blower wheel should not be dropped or bend as balance will be affected.

9.Reassemble motor and blower by reversing items 9a through 9f. Be sure to reattach ground wire.

10.Reinstall blower assembly in furnace.

11.Reinstall control and transformer support assembly in furnace.

12.Reconnect blower leads to furnace control.

Refer to furnace wiring diagram (See Fig. 7), and connect thermostat leads if previously disconnected.

NOTE: Refer to Table 1 for motor speed lead relocation if leads were not identified before disconnection

TABLE 1ÐSPEED SELECTOR

		FACTORY-
COLOR	SPEED	ATTACHED
		TO
Black	High	Cool
Yellow (When	Medium High	Spare
Present)
Blue	Medium Low	Heat
Red	Low	Spare
White	Common	L2/COM

CAUTION: Heating air speed selection MUST be ad- justed to provide proper temperature rise as specified on the rating plate. Failure to adjust the heating speed may shorten heat exchanger life.

13.Turn on electrical supply. Manually close blower access door switch. Use a piece of tape to hold switch closed. Check for proper rotation and speed changes between heating and cooling by jumpering R to W and then R to Y on furnace control thermostat terminals.