18
P/N 38033 Rev. C 12-1-00
Maintenance - Desooting
Common Causes of Sooting
1. Low gas pressure.
2. Inadequate air supply or inadequate venting.
3. Foreign material in burners and orifices; dirt,
spider webs, etc.
4. Excessive water flow can cause condensation
which will contribute to sooting.
5. Heater cycling rapidly; fires, shuts down and
refires quickly 30-45 seconds.
To remove a light soot formation without
removing the heater exchanger:
1. Remove burner tray.
2. Remove top, inner lid, flue collector and baffles.
7. If flames burn clean, replace baffles, flue
collector, and top.
CAUTION
DO NOT USE WIRE BRUSH!
3. Using a brush with plastic or wood bristles,
brush the bottom of the tubes and then the top of
the tubes.
4. Spray off residue with water. (Repeat steps 3-4
as needed).
5. Brush off burners.
6. Replace burner tray and baffles, then test fire.
For heavy soot accumulation which cannot
be successfully removed by merely brush-
ing, the heat exchanger must be removed
from the heater.
1. Disconnect the plumbing at the flanges. Remove
the thermistor, hi-limit wires from the inlet
outlet heater.
CAUTION
When lifting the heat exchanger out of the fire box,
use caution so as not to damage the fire wall.
2. Remove the heat exchanger.
3. Place exchanger in an area that won’t be
affected by chemicals or strong detergents.
4. After spraying the exchanger with water, use a
mixture of detergent and water. Pour, spray or
brush on.
5. Rinse the solution off of the tubes and inspect
them, repeat if necessary.
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