Bryant 330JAV Service And Maintenance Procedures Manual Download

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(1.) Attach variable-speed, reversible drill to end of

spring cable (end opposite brush).

(2.) Remove cell outlet plates. IMPORTANT: Replace

screws in center panel before cleaning.

(3.) Insert brush end of cable into upper opening of cell

and slowly rotate with drill. DO NOT force cable.
Gradually insert at least 36 in. of cable into 2 upper
passes of cell. (See Fig. 7.)

(4.) Work cable in and out of cell 3 or 4 times to obtain

sufficient cleaning. DO NOT pull cable with great
force. Reverse drill and gradually work cable out.

(5.) Remove burner assembly and cell inlet plates.

NOTE:

Be very careful when removing the burner assembly to

avoid breaking the ignitor. See Fig. 8 for the correct ignitor
location.

(6.) IMPORTANT: Replace screws in center panel and

cells before cleaning.

(7.) Insert brush end of cable in lower opening of cell,

and proceed to clean 2 lower passes of cell in same
manner as 2 upper passes.

(8.) Repeat foregoing procedures until each cell in

furnace has been cleaned.

(9.) Using vacuum cleaner, remove residue from each

cell.

(10.) Using vacuum cleaner with soft brush attachment,

clean burner assembly.

(11.) Reinstall cell outlet plates and screws FIRST;

then, reinstall cell inlet plates and burner assem-
bly. Care must be exercised to center burners in
cell openings.

9. After cleaning flue openings, check sealant on flue collector

to ensure that it has not been damaged. If new sealant is
needed, contact your dealer or distributor.

10. Clean and replace flue collector assembly, making sure all

8 screws are secure.

11. Reinstall relief box.

12. Reconnect wires to the following components:

a. Draft safeguard switch.

b. Inducer motor.

c. Pressure switches.

d. Limit overtemperature switch(es).

e. Gas valve.

f. Hot surface ignitor.

g. Flame-sensing electrode.

h. Wiring connectors leading to control.

13. Reconnect vent pipe to relief box. When applicable replace

vent pipe enclosure.

14. Replace blower door only.

15. Turn power and gas to ON.

16. Set thermostat and check furnace for proper operation.

17. Verify blower airflow and speed changes between heating

and cooling.

18. Check for gas leaks.

19. Replace control door.

WARNING:

Never use a match or other open flame to

check for gas leaks. Use a soap-and-water solution. A
failure to follow this warning could result in fire, personal
injury, or death.

Electrical Controls and Wiring

NOTE:

There may be more than 1 electrical supply to unit.

The electrical ground and polarity for 115-v wiring must be
maintained properly. Refer to Fig. 9 and 10 for field wiring
information and to Fig. 11 for unit wiring information. If the
polarity is NOT correct, the furnace control will display rapid
flashing on the status LED and prevent heat operation. The control
system also requires an earth ground for proper operation of the
microprocessor.
With power disconnected to unit, check all electrical connections
for tightness. Tighten all screws on electrical connections. If any
smoky or burned connections are noticed, disassemble the connec-
tion, clean all parts and stripped wire, and reassemble properly and
securely. Electrical controls are difficult to check without proper
instrumentation; therefore, reconnect electrical power to unit and
observe unit through 1 complete operating cycle.
The 24-v circuit contains an automotive-type, 3-amp fuse located
on the main control. Any 24-v electrical shorts during installation,
service, or maintenance could cause this fuse to blow. If fuse
replacement is required, use ONLY a 3-amp fuse. The control will
display code 24 when fuse needs replacement.