3. Disconnect flue pipe.
4. Remove outside flue collar.
5. Remove top rear panel.
NOTE:
Blower removal as described in Blower Oiling and
Removal section may be desired for easier access when cleaning
with duct work attached.
6. Remove inside collar on flue pipe.
7. Remove top partition.
8. Place field-fabricated cardboard on metal tray beneath collec-
tor box to prevent debris from entering blower compartment.
9. Remove flue collector box from secondary heat exchanger
tube flange. This exposes inside surfaces of secondary tubes of
heat exchanger.
10. Clean secondary tubes and flue pipe with a stiff brush and
vacuum cleaner.
11. Remove louvered door.
12. Disconnect limit control wires.
13. Disconnect oil line and remove oil burner from furnace.
14. Remove observation door and collar on observation tube.
15. Remove intermediate panel. Care must be taken not to bend or
damage limit control.
16. Loosen to hand tightness the 3 nuts labeled "A" in Fig. 4.
Remove screws labeled "B" in Fig. 4. Slide combustion
chamber forward out of heat exchanger. Be careful not to
bump combustion chamber as it becomes brittle after having
been fired.
17. Use a stiff brush and vacuum cleaner to clean inside of
primary drum.
Never use incendiary type cleaners (smoke sticks) for clean-
ing!
For all heat exchanger plates that have been removed, the
gaskets MUST be replaced. Failure to replace gaskets could
lead to heat exchanger leakage, sooting, and a hazardous
condition which could lead to bodily harm.
18. Before reassembly, heat exchanger and combustion chamber
should be inspected to determine if replacement is required.
After cleaning, place combustion chamber back into primary
drum and secure with "B" screws. Ensure that cover plate
gasket is in place before tightening screws. Care must be taken
not to damage combustion chamber. The "B" screws should be
tightened to 35-45 lb-in.
19. Tighten "A" nuts to 30 lb-in. of torque (firm, but not overly
tight).
20. Replace intermediate panel, observation tube collar, observa-
tion door, limit wiring, and oil burner.
21. Replace collector box on secondary tube flange, ensuring
proper placement of gasket. Tighten screws to 35-45 lb-in. of
torque.
22. Replace top partition, inside collar on flue pipe, top rear panel,
outside flue collar, and blower door.
23. Reconnect flue pipe and oil line(s).
24. Readjust burner for proper operation. Check limit operation as
outlined in Limit Control Check section.
Step 4—Blower Oiling and Removal
Periodic oiling of blower motor may be necessary. Check for
instructions on inside of blower access door.
If it is ever necessary to remove blower from furnace:
1. Turn off all electrical power to furnace.
2. Remove blower door.
3. Remove screws securing blower legs to blower rails mounted
on bottom panel of furnace.
4. Slide blower forward on rails toward rear of unit until motor
wire connections at terminal block on motor can easily be
reached and disconnected.
5. Disconnect motor wires at terminal block on motor.
6. Remove blower from unit.
7. Reverse items 1 through 6 to reinstall blower. Refer to wiring
diagram (Fig. 7) of these instructions or diagram located on
inside of louvered door to properly rewire unit.
Step 5—Keeping Filters Clean
Never operate unit without a filter or with filter access door
removed. Failure to adhere to this warning could lead to a
hazardous condition which could lead to equipment damage
and bodily harm.
As a homeowner, keeping filters clean is your most important
responsibility. A dirty filter reduces efficiency of your system,
causes erratic performance of controls, and could result in damage
to motor or heating element.
1. Inspect filters at regular intervals depending upon dirt condi-
tions. For new homes, check filters every week for 4 consecu-
tive weeks. In all cases, inspect filters at least every 3 to 4
weeks when system is in constant operation. Replace or clean
filter at least at beginning of each season (heating and cooling)
and thereafter as needed.
2. If a permanent filter is used, it can be cleaned with cold water
and soap.
Be sure that filter is thoroughly dry before installing back into
furnace.
Fig. 4—Removing Combustion Chamber
A96398
A
B
a95103
yyy
yyy
8
