Care And Maintenance; Fg3A Service And Troubleshooting; Service - Bryant SM03-4 Service Manual

3. Remove sheet metal screw holding bracket clip in place.
Screw is located between coil and refrigerant flow-control
device.
4. Pull bracket clip out.
5. Remove refrigerant flow-control device assembly.
6. Pull strainer out of coil liquid refrigerant tube and replace
with new strainer.
V. CARE AND MAINTENANCE
WARNING: Hinged access panel contains electrical
components and is heavy. Support panel when lowering
to clean unit to avoid personal injury.
WARNING: Disconnect electrical power to all circuits
before servicing unit. Failure to do so may result in
personal injury from electrical shock or moving parts.
WARNING: As with any mechanical equipment, per-
sonal injury can result from sharp metal edges. Be careful
when removing parts.
The minimum maintenance requirements for this equipment are as
follows:
1. Inspect and clean or replace field-supplied air filter each
month or as required.
2. Inspect cooling coil, drain pan, and condensate drain each
cooling season for cleanliness. Clean as necessary. (To be
performed by trained personnel.)
3. Inspect blower motor and wheel for cleanliness each
heating and cooling season. Clean as necessary.
4. Inspect electrical connections for tightness and controls for
proper operation each heating and cooling season. Service
as necessary.
NOTE: Never operate without a filter or with hinged access door
open. Damage to blower motor may result.
A. Cooling Coil, Drain Pan, and Condensate Drain
Remember to disconnect electrical power before opening hinged
access panel.
The cooling coil is easily cleaned when dry. Inspect coil and clean
(if necessary) before each cooling season. If coil inlet face is
coated with dirt or lint, vacuum with a soft brush attachment.
Be careful not to bend coil fins. If coil is coated with oil or grease,
clean it with a mild detergent-and-hot water solution. Rinse coil
with clear water. Be careful not to splash water onto insulation.
Inspect drain pan and condensate drain at same time cooling coil
is checked. Clean drain pan and condensate drain by removing any
foreign matter from pan. Flush pan and drain tube with clear water.
Clear drain line if restricted.
NOTE: There MUST be a trap in condensate line. Trap must be
at least 3-in. deep, not higher than the bottom of unit condensate
drain opening, and pitched downward to an open drain or sump.
B. Blower Motor and Wheel
Clean blower motor and wheel when cooling coil is cleaned.
Lubricate motor every 5 years if motor is used on intermittent
operation (thermostat FAN switch at AUTO position), or every 2
years if motor is in continuous operation (thermostat FAN switch
at ON position). Remove motor to lubricate. Put approximately 8
drops of SAE 10 nondetergent oil in each oil hole. Do not overoil
motor. Plug hole securely so that oil does not drip when hinged
access panel is lowered to open position.
Blower motor and wheel may be cleaned using a vacuum with a
soft brush attachment. Remove grease with a mild solvent such as
hot water and detergent. Be careful not to disturb balance weights
(clips) on blower wheel vanes. Do not drop or bend wheel as
balance will be affected.

FG3A SERVICE AND TROUBLESHOOTING

I. SERVICE
A. Motor
Ball bearing oilers are provided on blower motor. Use electric
motor oil or SAE 10 or 20 nondetergent oil. Check motor mount
bracket and base bolts. Tighten as required.
B. Blower
Check ball bearings for wear. Ball bearings are self-aligning and
grease packed. Replace as required. Check thrust collars for end
play and alignment of wheel. Check blades for accumulation of
dirt. Clean as required. Check mounting brackets, base bolts, and
isolation material.
See Fig. 37 for diagram of internal wiring for blower coil
assembly. Control box (standard 4-in. junction box) is mounted on
refrigerant connection side of unit. All leads pass through strain
relief where they enter control box. Wiring inside cabinet is
located so it does not come in contact with moving parts or sharp
edges.
BLOWER
MOTOR
GROUND
Fig. 37—Wiring Schematic
C. Pulley and Belts
Check belt tension and pulley alignment. (See Fig. 38.) Belt
tension is adjusted by motor tailpiece bolt. A deflection of about
3/4 in. to 1 in. per foot of span should be obtained by pressing belt
firmly. Lock adjusting bolt in position after adjustment is made.
Align pulley grooves by locating motor pulley on motor shaft or by
moving entire motor along motor mounting bracket. Adjust blower
speed by loosening setscrew in outer (moveable) pulley face and
turning this face (half or full turns) so that adjusting setscrew is
positioned precisely over the flat on pulley hub. Speed is reduced
by adjusting pulley faces so they are further apart; speed is
increased with faces closer together. Check pulley setscrews and
bolts.
PULLEY ALIGNMENT
Fig. 38—Checking Pulley Alignment and Tightness
D. Cleaning or Replacing Refrigerant
Flow-Control Device
Refer to Fig. 36 and instructions given in FD3A Service and
Troubleshooting section above.
—45—
UTILITY
BOX
MUST BE
"
PARALLEL
3
⁄
4
FOR PROPER
ALIGNMENT
BELT ADJUSTMENT
LINE
GROUND
LEAD
A91151
1'
A91150