Models NOL/NOR Modulating Revision 101199B
Page 20
The burner should be kept clean inside and out. It
will be more reliable, and if an oil leak occurs it
will be spotted more readily.
Daily Checks
Inspect the burner daily to check if there is any
variation from the correct operating sequence, as
follows:
Check the oil pressure on the nozzle line gauge.
This should be 27.8 bar (400 psi). On heavy fuel
burners a drop in line pressure may indicate clog-
ging of the hot oil filter which is situated in the
outlet pocket of the pre-heater tank. Remove the
filter by removing the four bolts from the outlet
pocket flange and disconnecting the pipework. Lift
the filter out and wash in kerosene. If the oil pres-
sure remains low, then check the oil supply sys-
tem, stop/fire valves, ring main pumps etc and also
the cold oil filter(s).
Check the spill pressures. If these are low it may
indicate that the oil nozzle filter is clogged.
If there is an inspectIon window on the appliance
through which the ignition spark and flame can
be observed, ignition and flame should be in-
spected and any irregularities that are observed
should be rectified i.e. nozzle/electrodes cleaned
and any deposits removed from the inside of the
flame tube and diffuser.
Cleaning the Oil Nozzle
To clean the oil nozzle, switch off the electricity
supply to the burner and disconnect the flexible
oil lines at the burner head quick release couplings.
Remove the hinge plate retaining nuts and swing
open the burner. Disconnect the H.T. leads and
remove the two long cap head screws retaining the
inner assembly, from the face of the oil manifold
block on the side of the hinged extension. The in-
ner assembly lance can now be removed complete
with the diffuser and electrode assembly by with-
drawing from the flame tube/hinge assembly. It is
important that the nozzle is cleaned using non-
abrasive materials, never use anything which may
scratch the finely finished surfaces of the nozzle.
Nozzle life is approximately 5000 hours opera-
tion
, after which wear will affect atomisation and
plant efficiency will drop.
Photoelectric Cell
Remove the photoelectric cell and clean with a
soft lint free cloth if necessary. Be carefull not to
touch the glass buld of the cell as this can lead to
premature failure of the unit.
Cold Oil Filter(s)
On residual oil burners, rotate the cleaning knob
of the cold oil filter daily.
The plug in the bottom of the filter housing should
be removed and sludge water drained off at inter-
vals not exceeding six weeks. If a duplex cold oil
filter set is fitted, the filters can be alternated and
isolated for cleaning operations as necessary.
On distillate oil burners, the filter bowl should be
removed and the filter element cleaned in kero-
sene every six months. If the filter has a disposable
element renewal should be considered.
Replenishing the Fuel Supply
It is usual practice to shut boiler(s) off whilst deliv-
ery of fuel is being made and allow approximately
30 minutes for any sediment to settle before re-
starting the burners.
Boiler Combustion Surface
Keep the boiler combustion surfaces and flueways
clean. Any accumulation of soot will decrease the
efficiency of the boiler and increase the flue gas
exit temperature. Always cover up the burner dur-
ing boiler cleaning operations.
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If the Burner Fails to Start
Make sure that all the thermostats and switches in
the control circuit are in the made position and
that the oil pre-heater excess limit thermostat has
not tripped. Reset if required. Check that the low
oil temperature thermostat is set correctly for the
appropriate fuel.
Check that the electricity supply to the burner is
live and that the control and main circuit fuses
are intact. If a fuse is found to be blown then the
cause should be investigated and rectified before
proceeding further.
On steam boilers, check that the water level in-
terlocks are in the made position.
If the burner is found at lockout (red lockout
lamp illuminated)
Reset the burner and observe the starting se-
quence. (Make reference to the
Sequence Diagram
and Timing Charts
for the Flame Failure controls
on page 23 for further information).
Check the fan and oil pump motor overloads and
reset if necessary.