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b. Insert the twisted wire end of brush into end of spring ca-
ble, and crimp tight with crimping tool or crimp by strik-
ing with ball- -peen hammer. TIGHTNESS IS VERY IM-
PORTANT.
9/32"
7.1mm
Fig. 45 - - Igniter Position- -Side View
Fig. 46 - - Igniter Position- -Top View
NOTE: The materials needed in item 9 can usually be purchased
at local hardware stores.
(1.) Attach variable- -speed, reversible drill to the end of
spring cable (end opposite brush).
(2.) Insert brush end of cable into the outlet opening of
cell and slowly rotate with drill. DO NOT force ca-
ble. Gradually insert cable into upper pass of cell.
(See Fig. 47 .)
(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.) Insert brush end of cable in burner inlet opening of
cell, and proceed to clean 2 lower passes of cell in
same manner as upper pass.
(5.) Repeat foregoing procedures until each cell in fur-
nace has been cleaned.
(6.) Using vacuum cleaner, remove residue from each
cell.
(7.) Using vacuum cleaner with soft brush attachment,
clean burner assembly.
(8.) Clean flame sensor with fine steel wool.
(9.) Install NOx baffles (if removed).
(10.) Reinstall burner assembly. Center burners in cell
openings.
10. Remove old sealant from cell panel and collector box
flange.
11. Spray releasing agent on the heat exchanger cell panel
where collector box assembly contacts cell panel.
NOTE: A releasing agent such as cooking spray or equivalent
(must not contain corn or canola oil, aromatic or halogenated
hydrocarbons or inadequate seal may occur) and RTV sealant
(G.E. 162, 6702, or Dow- -Corning 738) are needed before
starting installation. DO NOT substitute any other type of RTV
5/16"
sealant. G.E. 162 (P771- -9003) is available through RCD in 3- -oz.
7.9mm
tubes.
12. Apply new sealant to flange of collector box and attach to
cell panel using existing screws, making sure all screws
are secure.
13. Reconnect wires to the following components. (Use con-
nection diagram on wiring label, if wires were not marked
for reconnection locations.):
a. Draft safeguard switch.
b. Inducer motor.
c. Pressure switch(es).
d. Limit over- -temperature switch.
e. Gas valve.
f. Hot surface igniter.
A05025
g. Flame- -sensing electrode.
h. Flame rollout switches.
14. Reinstall internal vent pipe, if applicable.
15. Reinstall vent connector on furnace vent elbow. Securely
1-7/8
fasten vent connector to vent elbow with 2 field- -supplied,
47.6 mm
corrosion- -resistant, sheet metal screws located 180_ apart.
16. Replace blower access door only, if it was removed.
17. Set thermostat above room temperature and check furnace
for proper operation.
18. Verify blower airflow and speed changes between heating
and cooling.
19. Check for gas leaks.
A05026
20. Replace outer access door.
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death and/or property damage.
Never purge a gas line into a combustion chamber. Never
test for gas leaks with an open flame. Use a commercially
available soap solution made specifically for the detection of
leaks to check all connections.
42
i. Install NOx baffles (if removed).
Fig. 47 - - Cleaning Heat Exchanger Cell
WARNING
!
A91252
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