21
Nozzles And Electrodes
:
Use proper size, spray angle,
and spray pattern nozzle. Refer to recommended nozzle
selection charts.
To install nozzle, remove nozzle line electrode assembly,
if necessary remove retention ring assembly, and install
and tighten nozzle. Take care not to damage electrode
insulators or bend electrode tips.
After installing nozzle, reassemble nozzle line electrode
assembly and set electrode tip spacing.
Depending on burner type, electrode tip spacing may
need to be set prior to reassembling nozzle line electrode
assembly.
Refer to following pages for setting electrode tip spacing.
Final Burner Adjustments:
Final burner adjustments
must be made using combustion test instruments. Refer to
“Burner Settings”. Set burner accordingly.
•
Check draft over fire to verify it is between 0.01” WC
and 0.02” WC, adjust draft as necessary.
• After operating 10 minutes to warm up boiler, use
combustion test equipment to take smoke reading in
flue pipe between boiler and draft regulator.
• Smoke reading should be zero to trace (Shell Bacharach
Scale).
• A new boiler requires more than 10 minutes to burn
clean due to oil film on new heat exchanger.
• If smoke reading is zero, gradually close burner’s air
adjustment to obtain smoke reading showing trace
smoke reading. Once smoke reading is trace, measure
CO
2
and as insurance margin increase air to sufficiently
reduce CO
2
by ½% to 1%.
If clean fire cannot be obtained, it is necessary to verify
burner head and electrode alignment. Proper electrode
alignment figures are presented on following pages. If
fire continues to be smoky, replace nozzle with correct
replacement.
Once burner is completely adjusted, burner should
be started and stopped several times to assure good
operation with no fluttering or rumbling. Verify there
are no oil leaks and record nozzle size, oil pressure,
combustion readings, and air settings on tag or label
attached to burner or boiler.
Oil Burner Maintenance
:
Perform following
preventative maintenance annually, preferably prior to
heating season.
1.
Fuel Filter
Replace to prevent contaminated fuel from
reaching nozzle. Partially blocked fuel filter can cause
premature failure of fuel pump.
2.
Fuel Pump Unit
Replace pump screen and clean pump
unit to maintain fuel delivery to nozzle.
3.
Ignition Electrodes
Clean and adjust per
manufacturer’s recommendations, to maintain reliable
ignition of oil.
4.
Nozzle
Replace to maintain safe and reliable
combustion efficiency. Replace with nozzle as required
in charts located in this manual.
5.
Fan and Blower Housing
Must be kept clean, free of
dirt, lint and oil to maintain proper amount of air fuel
requires to burn.
6.
Check Final Burner Adjustments.
If any component parts must be replaced, always use parts
recommended by burner manufacturer.
OPERATING THE BOILER