ÐPosition of Ignitor to Burner, Ð4Ð

a.	Draft safeguard switch.
b.	Inducer motor.
c.	Pressure switch(es).

NOTE: Be very careful when removing the burner assembly to avoid breaking the ignitor. See Fig. 6 for the correct ignitor location.

	d. Limit overtemperature switch(es).
	e. Gas valve.
	f. Hot surface ignitor.
	g. Flame-sensing electrode.
	h. Wiring connectors leading to control.
4.	Remove 2 screws that secure relief box. (See Fig. 4.)
5.	Remove 8 screws that secure flue collector box to center
	panel. Be careful not to damage sealant.
6.	Remove complete inducer assembly from furnace, exposing
	flue openings.
7.	Using field-provided small wire brush, steel spring cable,
	reversible electric drill, and vacuum cleaner, clean cells as
	follows:
	a. Assemble wire brush and steel spring cable.
	(1.) Use 48 in. of 1/4-in. diameter high-grade steel
	spring cable (commonly known as drain clean-out
	or Roto-Rooter cable).

13 32"

BURNER

11 32"

CELL

PANEL

HOT

SURFACE

IGNITOR

ASSEMBLY

(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 spring cable, and crimp tight with crimping tool or strike

C IGNITOR L

7 8"

C BURNER L

IGNITOR

ASSEMBLY

with ball-peen hammer. TIGHTNESS IS VERY IMPORTANT.

Fig. 6ÐPosition of Ignitor to Burner

A93347

(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 spring cable (end opposite brush).

(2.) Remove cell outlet plates. IMPORTANT: Replace screws in center panel to secure heat exchanger cells 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. 5.)

A91252

Fig. 5ÐCleaning Heat Exchanger Cell

(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.

Ð4Ð

(6.) IMPORTANT: Replace screws in center panel to secure heat exchanger 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 the burners in the cell openings.

8.After cleaning flue openings, clean flue collector. Check sealant on flue collector to ensure that it has not been damaged. If new sealant is needed, contact your dealer or distributor.

9.Replace flue collector assembly, making sure all 8 screws are secure.

10.Reinstall relief box.

11.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.