Page 19
Models NOL/NOR Modulating Revision 101199B
Once this has been done, there should be a fairly
smooth profile between low and high positions.
Ensure that the flame is visually clean throughout
the modulation range at all times.
Check the oil consumption. If this is not correct for
the full burner rating, the oil cam must be adjusted
as follows.
(a)
Inch the burner to low flame and note the
spill pressure.
(b)
To increase the minimum rate, adjust as
shown in fig. 1.
(c)
Adjust the cam to give more eccentricity for
more oil at high flame, and visa-versa.
(d)
Return to the minimum setting and compen-
sate for any changes.
(e)
Inch the burner to high flame and again check
the oil flow.
Continue to repeat (a) to (d) until the high flame
oil rate is correct.
When a satisfactory flame is achieved, again check
the line and spill pressures. Check the pre-heater
temperature (if fitted) and adjust if necessary.
•
Inch the camshaft back to the low flame po-
sition. The oil consumption rate should now
be between 35 and 50% of the rated maxi-
mum.
•
Measure the flue gas composition and ad-
just the combustion air volume as necessary.
•
Check the burner performance throughout
the range adjusting the air cam profile as nec-
essary to give a clean and efficient flame.
When a satisfactory setting has been achieved, lock
the air cam thumbscrews with the grubscrews fit-
ted in the side face of the cam body. Refit the
Modulating unit access cover.
Check the function of the air pressure switch.
•
Switch off the electrical supply to the burner.
•
Remove the air pressure switch cover. Fit a
manometer to the pressure switch to check
the actual air pressure against the pressure
switch dial setting.
•
Switch on the electrical supply and allow the
burner to establish low flame.
•
Select Hand control and ensure that the
burner is at low flame by using the inching
switch.
•
Slowly turn the air pressure switch adjusting
dial clockwise until the flame is extinguished.
The burner will go to lockout.
•
Turn the dial one division anticlockwise and
reset the burner lockout. The burner will now
continue through its cycle until flame is es-
tablished or the burner goes to its lockout
position. If the burner goes to lockout repeat
the procedure one division per burner cycle
until flame is established. Once successful,
turn the dial a further two divisions anticlock-
wise.
•
Switch off the burner electrical supply, re-
place the air pressure switch cover and re-
move the manometer.
If the burner control panel is inclusive of Low
Excess low and High Water interlocks and alarms,
test that these function correctly. Ensure that the
boiler feed pump switchgear provided in the panel
is operating satisfactorily.
Adjust the modulating control to the required pres-
sure/temperature.
Allow the boiler to attain the correct working pres-
sure/temperature and adjust the on/off and limit
instruments to the desired values.
Switch the Hand/Auto selector switch to Auto.
The plant is now under the control of the pres-
sure/temperature controllers for modulation and
the on/off and high limit instruments for control.
On residual oil burners, check the operation of the
three oil temperature thermostats fitted in the end
of the preheater tank element, and the re-circula-
tion thermostat (class G fuel only).
Finally check all ancillary controls and equipment
such as damper interlocks etc.
RRRRR
OUTINE
OUTINE
OUTINE
OUTINE
OUTINE
M
M
M
M
M
AINTENANCE
AINTENANCE
AINTENANCE
AINTENANCE
AINTENANCE
OF
OF
OF
OF
OF
NOL/
NOL/
NOL/
NOL/
NOL/
NOR M
NOR M
NOR M
NOR M
NOR M
ODUL
ODUL
ODUL
ODUL
ODULAAAAATING
TING
TING
TING
TING
B
B
B
B
B
URNERS
URNERS
URNERS
URNERS
URNERS
General
It is vitally important that personnel responsible
for the day to day operation and maintenance of
the plant are instructed by the commissioning en-
gineer on the basic function of the burner as well
as the need for routine maintenance and daily
checking of burner operations.
Final adjustments, which will have been made
during the commissioning, must be recorded on
the
Commissioning Sheet
at the back of this manual
and in the appliance
logbook
. A copy of the com-
missioning data
must
be sent to the appliance
manufacturer.
