Desooting - Pentair Pool Products MiniMax NT Series Service Manual

Maintenance -
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.
To remove a light soot formation without
removing the heater exchanger:
1. Remove burner tray.
2. Remove top, inner lid, flue collector and baffles.
WARNING
Soot is combustible — 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.
7. If flames burn clean, replace baffles, flue collector, and top.
Rev. B 2-11-04

Desooting

For heavy soot accumulation which cannot
be successfully removed by merely
brushing, the heat exchanger must be
removed from the heater.
1. Disconnect the plumbing at the unions. Remove the
thermistor, hi-limit wires from the inlet outlet heater.
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.
CAUTION
P/N
27
NTSM03