Bryant 376B - Manual (Page 7)

PILOT TUBE REGULATOR
CONN
PILOT J.
ADJUSTMENT
ADJUSTMENT
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\: PRESSURE
TAP
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Figure 16—Redundant Automatic Gas
Control Valve
For continuing high performance, and to minimize possible
equipment failure, it is essential that periodic maintenance
be performed on this equipment. Consult your local Dealer
as to the proper frequency of maintenance and the availabil­
ity of a maintenance contract.
The abihty 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.
The niinimum maintenance that should be performed on
this equipment is as follows:
1. Check and clean or replace air filter each month or as
required.
2. Check blower motor and wheel for cleanliness and lubri­
cation 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
necessary.
A. Air Filter
Each furnace accommodates two filters which are installed
in the return-air duct. See Figures 10 and 11.
To clean or replace the filters, proceed as follows:
1. Disconnect electriceil power before removing access
panel.
2. Remove upper access panel.
3. Reach up behind top plate, tilt filters toward center of
retum-air plenum, remove filters, and replace or clean
as needed.
4. Furnaces are equipped with permanent, washable fil­
ters. Clean those filters as follows:
a. Clean with tap water.
b. Rinse and let dry. No oiling or coating of filters is
required.
c. Reinstall filters with cross-hatch binding facing
blower.
B. Blower Motor and Wheel
1. Remove blower access panel.
2. Remove vent pipe enclosure.
3. Disconnect vent pipe and remove short piece of pipe
from furnace.
4. Disconnect wires from auxiliary limit on blower
housing.
NOTE: For ease of blower removal, it may be necessary to
remove the control box on some sizes.
5. Remove blower assembly from furnace.
6. Remove motor from blower housing.
7. Lubricate motor using good grade of SAE 20 nondeter­
gent motor oil. Put one teaspoon, 5cc, 3/16 oz., or 16 to
25 drops in each oil port.
8. Remove blower wheel from housing and clean by using
vacuum with soft brush attachment. Care must be
exercised not to disturb balance weights (clips) on
blower wheel vanes.
9. Reassemble furnace by reversing above procedures.
When a more detailed servicing procedure is required, see
the furnace Service Manual available from yom Dealer or
Distributor.
C. Cleaning Heat Exchanger
If it becomes necessary to clean the heat exchanger because
of carbon deposits, soot, etc., proceed as follows:
NOTE: Deposits of soot and carbon indicate a problem exists
and needs correcting. Corrective action must be taken to
correct the problem.
1. Turn off gas and power to furnace.
2. Remove control and blower access doors.
3. Remove vent pipe enclosure and disconnect vent pipe
from relief box.
4. Remove four screws that secure relief box to blower
shelf.
5. Disconnect two wires from safeguard switch.
6. Disconnect wire harness edge connector from side of
inducer control box.
-I’i
A77007
Figure 17—Dual Blower With Left-Hand
Housing and Wheel Removed.
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