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7. Reconnect flue elbow and flue pipe.
8. Turn on power to unit and readjust burner for proper
operation. Inspect cleanout ports and flue connection to
make sure there are no leaks.
B. Cleaning Both Primary and Secondary Heat
Exchanger Sections
If a more thorough cleaning is required (both primary and
secondary heat exchanger sections), the following steps should be
performed:
1. Turn off all oil and electrical supplies upstream of furnace.
CAUTION: If furnace has been in operation, some
surfaces may be hot. Allow time for unit to cool down.
2. Disconnect flue pipe and remove flue elbow.
3. Remove collar on flue connection.
4. Remove observation door.
5. Remove upper vestibule panel.
6. Place field-fabricated cardboard on metal tray beneath
collector box to prevent debris from entering blower com-
partment.
7. Remove flue collector box from secondary heat exchanger
tube flange. This exposes inside surfaces of secondary tubes
of heat exchanger.
8. Clean secondary tubes and flue pipe with a stiff brush and
vacuum cleaner.
CAUTION: If soot is allowed to fall into heat exchanger
compartment, it must be vacuumed up before turning
furnace back on. If this soot is not cleaned up, it will blow
through duct work and into the house.
9. Disconnect limit control wires.
10. Disconnect oil line and remove oil burner from furnace.
11. Remove collar on observation tube.
12. Remove lower intermediate panel. Care must be taken not
to bend or damage limit control.
13. Loosen to hand tightness the 3 nuts labeled "A" in Fig. 6.
Remove screws labeled "B" in Fig. 6. Slide combustion
chamber forward out of heat exchanger. Be careful not to
bump combustion chamber as it becomes brittle after
having been fired.
Fig. 6—Removing Combustion Chamber
14. Use a stiff brush and vacuum cleaner to clean inside of
primary drum.
CAUTION: Never use incendiary type cleaners (smoke
sticks) for cleaning!
A
B
A96398
—10—
WARNING: 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.
15. Before reassembly, heat exchanger and combustion cham-
ber 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.
16. Tighten "A" nuts to 30 lb-in. of torque (firm, but not overly
tight).
17. Replace collector box on secondary tube flange, ensuring
proper placement of gasket. Tighten screws to 35-45 lb-in.
of torque.
18. Replace lower then upper intermediate panels, flue and
observation tube collars, observation door, flue elbow, limit
wiring, and oil burner.
19. Reconnect flue pipe and oil pipe(s).
20. Readjust burner for proper operation. Check limit operation
as outlined in Limit Control Check section.
IV. BLOWER OILING AND REMOVAL
Periodic oiling of blower motor may be necessary. Check for
instructions on inside of blower access panel.
If it is ever necessary to remove blower from furnace, refer to Fig.
7 and perform the following:
BLOWER
RETAINER
SCREW
Fig. 7—Removing Blower
1. Turn off electrical power to furnace.
2. Remove louvered door and blower door.
3. Remove blower retaining screw (on blower shelf near
corner where intermediate panel and blower shelf meet).
4. Remove cover from control box and disconnect thermostat
and power wires from board.
5. Remove 3 screws holding control box to blower partition.
REMOVE 3 SCREWS
TO REMOVE
JUNCTION BOX
A95486
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