Bryant 396G - Manual (Page 7)

be performed on this equipment. Consult your local Dealer
as to the proper frequency of maintenance and the
availability of a maintenance contract.
The ability to properly perform maintenance on this equip­
ment requires certain mechanical skills and tools. If you do
not possess these, contact your Dealer for maintenance.
WARNING: Turn oiT ga.s and electrical supplies to unit
before performing any maintenance or service on unit. Fol­
low relighting instructions on plate attached to furnace.
The minimum maintenance that should be performed on
this equipment is as follows:
1. Check and clean or replace air filter each month or as re­
quired.
2. Check blower motor and wheel for cleanliness and
lubrication each heating and cooling season. Clean and
lubricate as necessary.
3. Check electrical connections for tightness and controls
for proper operation each heating season. Service as nec­
essary.
WARNING: As with any mechanical equipment, personal
injury can result from sharp metal edges, etc.; therefore, be
careful when removing parts.
A. Air Filter
Each furnace accommodates two filters which are installed
above the furnace in the return-air plenum.
To clean or replace the filters, proceed as follows:
1. Disconnect electrical power before removing access
panel.
2. Remove upper access panel.
3. Reach up behind top plate, tilt filters toward center of
return-air plenum, remove filters, and replace or clean
as needed.
4. Some furnaces are equipped with permanent, washable
filters.
a. Clean with tap water.
b. Rinse and let dry.
c. No oiling or coating of filters is required.
d. Reinstall filters with cross-hatch binding facing
blower.
B. Blower Motor and Wheel
Clean and lubricate as follows:
1. Remove upper access panel.
2. Loosen screw in vent pipe enclosure front and remove
vent enclosure front by sliding forward (toward front of
unit).
3. Disconnect vent pipe at first joint above unit and swing
■ 3
A77007
Figure 17—Dual Blower With Left-Hand
Housing and Wheel Removed.
vent pipe assembly to the side, supported by suitable
means (block of wood, etc.).
4. Slide vent pipe upward through the rectangular' open­
ing in top plate and remove vent pipe from furnace. .
5. Remove four screws in vent pipe enclosure back and re­
move enclosure back by tilting top toward blower, and
sliding bottom toward front of furnace.
6. Disconnect electrical leads from right side of Molex
speed selector. Note location of wire¿ for reassembly.
7. Remove screws holding blower assembly against blower
deck and slide blower assembly out of furnace.
8. Squeeze side tabs of Molex speed selector and pull it
from blower housing.
9. Units with motor capacitor, loosen screw in strap hold­
ing capacitor to blower housing and slide capacitor from
under strap.
10. Mark blower wheel, motor, and motor support in rela­
tion to blower housing before disassembly, to insure
proper reassembly.
11. Loosen setscrew holding blower wheel onto motor shaft.
12. Remove bolts holding motor mount to blower housing
and slide motor and mount out of housing. Some motors
have a ground wire attached to blower housing; discon­
nect it also.
13. Lubricate motor.
a. Remove dust caps or plugs from oil ports located at
each end of motor.
b. Use good grade of SAE 20 nondetergent motor oil
and put one teaspoon, 5cc, 3/16 oz., or 16 to 25 drops
in each oil port.
c. Allow time for total quantity of oil to be absorbed by
each bearing.
d. After oiling motor, be sure to wipe excess oil from
motor housing.
e? Replace dust caps or plugs on oil ports.
14. Remove blower wheel from housing.
a. Mark blower wheel orientation and cutoff location to
insure proper reassembly.
b. Remove screws holding cutoff plate and remove
cutoff plate from housing.
c. Lift blower wheel from housing through opening.
15. Clean blower wheel and motor by using vacuum with
soft brush attachment. Care must be exercised not to
disturb balance weights (clips) on blower wheel vanes.
Also do not drop or bend wheel, as balance will be
affected.
16. Reassemble blower by reversing procedures 14a thru
14c. Be sure wheel is positioned for proper rotation.
17. Reassemble motor and blower by reversing procedures 8
thru 12. If motor has ground wire, be sure it is connected
as before.
18. Reinstall blower assembly in furnace.
19. Reinstall vent enclosure back.
20. Reinstall vent pipe through opening in top plate, secure
to drafthood and connect remainder of vent pipe as­
sembly.
21. Reinstall vent enclosure front, and secure with screw.
22. Reinstall access panel.
C. Cleaning Heat Exchanger
If it becomes necessary to clean the heat exchanger because
of carbon deposits, soot, etc., proceed as follows:
1. Turn off gas and electrical supply to furnace.
2. Remove front access doors.
3. Remove vent pipe enclosure front and flue pipe.
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