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35
Troubleshooting
(continued)
7. Burner motor runs, but burner will not heat.
Possible Cause
Solution
7a. Low fuel pump pressure.
7a. Check fuel pump pressure, adjust or replace if needed.
(Pressure should be checked by an authorized technician).
7b. Dirty fuel nozzle.
7b. Replace.
7c. Improper air adjustment setting.
7c. Adjust setting.
8. Excessive smoke from exhaust stack.
NOTE: There are a number of causes for dirty fires of oil burners in general. Only the more likely or plausible
reasons are noted.
Possible Cause
Solution
8a. Not enough combustion air, or too much
combustion air.
8a. White smoke on startup, too much air, reduce adjustment band
setting on burner housing. Black smoke on startup, not enough air,
increase adjustment band setting on burner housing.
NOTE: Final burner adjustments are best made after the
combustion chamber is hot. Wait five (5) minutes after startup for
final adjustment.
8b. Poor grade of fuel -- dirty or restricted fuel
supply -- loose fuel -- leak between fuel nozzle
adapter and fuel pipe of gun assembly.
8b. Use only recommended fuels. Check for restricted fuel inlet to
pump, or air leaks. Remove burner housing and check for a loose
fuel nozzle or fuel nozzle adaptor and tighten.
NOTE: Just before
a fuel filter, fuel nozzle filter screen, or a fuel pump internal
filter =screen plugs up, the burner will start smoking
excessively
.
8c. High altitude -- unit manufactured at a lower
elevation and shipped to elevation of 5,000 ft. or
above.
8c. Change to a fuel nozzle approximately ¼ GPH smaller, and
increase fuel pump pressure by 15-25 PSI to make up for fuel loss
with better atomization Repla
ce with the same type nozzle, “A” and
“B” nozzle, and at the same angle.
8d. Fuel pump pressure too low -- or too high for
size and angle of fuel nozzle.
8d. Maintain fuel pump pressure between 100 PSI and 140 PSI.
Pressures below 100 PSI may cause delayed ignition and dirty
burns through collapsing of the fuel pattern. Pressures in excess of
140 PSI may provide more fuel for the size and angle of the fuel
nozzle than the combustion area will allow.
17. Excessive fumes from exhaust stack. Does not smoke -- burns eyes, acrid smell.
Possible Cause
Solution
9a. Air adjustment band on burner open too wide.
9a. Close air band.
9b. Burner has been worked on and air handler parts
altered.
9b. Do not change the size of the blower fan or remove the
increment rings from the static disc on the burner gun assembly.
If the fuming condition is too excessive and cannot be removed
by air band adjustment, contact Harvest Tec. NOTE: delayed
ignition will also create excessive fumes.
Summary of Contents for 720 Dew Simulator
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Page 7: ...7 Safety Decal Locations...
Page 69: ...69 Notes...
Page 70: ...70 Notes...