Bryant 3Model 383KAV User Manual download pdf (Page 6)

The electrical ground and polarity for 115-v wiring must be

maintained properly. Refer to Fig. 10 for field wiring information

and to Fig. 12 for unit wiring information.

NOTE: If the polarity is not correct, the STATUS LED on the

control center will flash rapidly and prevent the furnace from

operating. The control system also requires an earth ground for

proper operation of the control board and flame sensing.

The 24-v circuit contains an automotive-type, 3-amp fuse located

on the control board. (See Fig. 11.) Any direct shorts of the 24-v

wiring during installation, service, or maintenance will cause this

fuse to blow. If fuse replacement is required, use ONLY a fuse of

identical size.

With power to the unit disconnected, check all electrical connec-

tions for tightness. Tighten all screws on electrical connections. If

any smoky or burned connections are found, disassemble the

connection, clean all parts, strip wire, and reassemble properly and

securely.

Reconnect electrical power to the unit and observe unit through 1

complete operating cycle. Electrical controls are difficult to check

without proper instrumentation; if there are any discrepancies in

the operating cycle, contact your dealer and request service.

For an explanation of fault codes, refer to service label located on

blower access door or Fig. 13, and the troubleshooting guide.

The control center stores 1 fault code (the last fault to occur) for a

period of 48 hrs or until the 115- or 24-v power is interrupted.

NOTE: Removing blower access door will open blower access

door switch and terminate 115-v power to control center, and fault

code will be erased. Look into blower access door sight glass for

current LED status.

1. To retrieve fault code, proceed with the following:

NOTE: NO thermostat signal may be present at control center,

and all blower time delay off periods must be completed.

a. Leave 115-v power to furnace turned on.

b. Look into blower access door sight glass for current

LED status.

NOTE: Leave blower access panel installed to maintain power to

control center to view current LED status.

c. Remove control access door.

d. BRIEFLY remove either wire from the main limit switch

until LED goes out, then reconnect it.

NOTE: If wire to main limit is disconnected longer than 4 sec,

main blower starts, and retrieval request is ignored.

2. When above items have been completed, the following will

occur:

a. LED flashes a fault code 4 times. Record this fault code

for further troubleshooting.

b. Inducer motor starts and continues to run the entire

component test.

c. Hot surface ignitor is energized for 15 sec, then de-

energized.

d. Main blower operates at cooling speed for 10 sec, then

turns off.

e. Main blower operates at heating speed for 10 sec, then

turns off.

f. Inducer motor stops.

Items a through e above will assist in furnace troubleshoot-

ing since all components are functionally operated except

the gas valve. This procedure is also referred to as "Com-

ponent Test."

3. Operate furnace through 1 heat cycle to test for proper

operation and check LED status.

4. If furnace is operating properly and LED indicates proper

operation, replace control access door.

5. Component Test can also be initiated by performing the

following:

a. Remove control access door.

b. Remove blower access door.

c. Manually close blower access door switch.

WARNING: Blower access door switch opens 115-v

power to control center. No component operation can

occur. Caution must be taken when manually closing this

switch for service purposes. Failure to follow this warn-

ing could result in personal injury or death.

d. BRIEFLY short (jumper) TEST, 1/4-in. quick-connect

terminal on control center (adjacent to LED diagnostic

light), and Com terminal on thermostat connection

block. (See Fig. 11.)

NOTE: If TEST to Com terminals are jumpered longer than 2 sec,

LED will flash rapidly, and retrieval request will be ignored.

e. Component Test will function as described in item 2

above.

f. Check LED status.

g. If LED status indicates proper operation, release blower

access door switch, replace blower access door, and

replace control access door.

E. Troubleshooting

Refer to the service label. (See Fig. 13.) Pages 10 and 11 contain

a troubleshooting guide. This guide can be a useful tool in isolating

furnace operation problems. Beginning with the word "Start,"

answer each question and follow the appropriate arrow to the next

item.

The guide will help to identify the problem or failed component.

After replacing any component, verify correct operation sequence.

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Bryant 3Model 383KAV User Manual Page 6

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