Bryant 3Model 383KAV User Manual download pdf (Page 5)

(2.) Use 1/4-in. diameter wire brush (commonly known

as 25-caliber rifle cleaning brush).

NOTE: The materials needed in items (1.) and (2.) can usually be

purchased at local hardware stores.

(3.) Insert twisted wire end of brush into end of steel

spring cable, and crimp tight with crimping tool or

strike with ball-peen hammer. TIGHTNESS is very

important.

(4.) Remove metal screw fitting from wire brush to

allow insertion into cable.

b. Clean each heat exchanger cell.

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

steel spring cable (end opposite brush).

(2.) 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. 8.)

(3.) 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.

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

CAUTION: Be very careful when removing the burner

assembly to avoid breaking the ignitor. See Fig. 9 for the

correct ignitor location.

(5.) Replace screws in center panel and cells before

cleaning.

(6.) 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.

(7.) Repeat foregoing procedures until each cell in

furnace has been cleaned.

(8.) Remove residue from each cell using vacuum

cleaner.

(9.) Clean burner assembly using vacuum cleaner with

soft brush attachment.

(10.) Clean flame sensor with fine sandpaper.

(11.) Reinstall cell inlet plates and burner assembly.

Care must be exercised to center the burners in the

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. Blocked vent safeguard

b. Inducer motor

c. Pressure switch

d. Limit overtemperature switch(es)

e. Gas valve

f. Hot surface ignitor

g. Flame-sensing electrode

13. Reconnect vent pipe to relief box. Replace vent pipe

enclosure (downflow/horizontal furnace only).

14. Replace blower access door only.

15. Turn on electrical power and gas.

16. Set thermostat and check furnace for proper operation.

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.

17. Check for gas leaks.

18. Replace control access door on upflow furnace.

19. On downflow/horizontal furnaces, remove blower access

door, replace control access door first, then replace blower

access door and secure with screw in front of door.

D. Electrical Controls and Wiring

CAUTION: There may be more than 1 electrical supply

to the unit. Check accessories and cooling unit for

additional electrical supplies.

Fig. 8—Cleaning Heat Exchanger Cell

A91252

Fig. 9—Position of Ignitor to Burner

A93347

BURNER

IGNITOR

IGNITOR

ASSEMBLY

CELL

PANEL

BURNER

HOT

SURFACE

IGNITOR

ASSEMBLY

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Bryant 3Model 383KAV User Manual Page 5

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