Carrier UPFLOW 58BTA - Manual (Page 10)

4. Remove the upper rear panel.
5. Remove the flue collector box from the
secondary heat exchanger tube flange. This
exposes the inside surfaces of the secondary
tubes of the heat exchanger. If only the
secondary needs to be cleaned, no further
disassembly is required.
6. Clean the secondary tubes and flue pipe with a
stiff brush and vacuum cleaner.
If the primary heat exchanger section is also to be
cleaned;
7. Disconnect the limit control wires
8. Disconnect the oil line and remove the oil
burner from the furnace.
9. Remove the observation door.
10. Remove the collar on the observation tube.
11. Remove the intermediate panel. (Care, must be
taken not to bend or damage the limit control.)
12. Loosen to hand tightness the three (3) nuts
labeled "A" in Figure 3. Remove the screws
labeled "B" in Figure 3. Slide the combustion
chamber forward, out of the heat exchanger.
Be careful not to bump the combustion
chamber as it becomes brittle after having been
fired.
13. Again, use a stiff brush and vacuum cleaner to
clean the inside of the primary drum.
CAUTION
Never use incendiary type cleaners (smoke sticks)
for cleaning!!
14. Before reassembly, the 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 the "B" screws-
insure that the cover plate gasket is in place
before tightening the screws. (Care must be
taken not to damage the combustion chamber.)
15. Tighten the "A" nuts to 30 pound-inches of
torque (firm, but not overly tight).
16. Replace the intermediate panel, observation
tube collar, observation door, limit wiring, and
oil burner.
17. Replace the collector box on the secondary
tube flange, insuring proper placement of the
gasket. If gasket is damaged in any way, it
should be replaced! Tighten the screws to 30
pound-inches of torque.
18. Replace the upper rear panel and flue collar.
19. Reconnect the flue pipe and oil pipe(s).
20. Readjust burner for proper operation. Check
limit operation as outlined in this manual.
COMBUSTION CHAMBER REMOVAL
Figure 3
ISSUE 9413
20142901 1018