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g. When the prepurge sequence is complete and the
low fire start switch (if used) is made, the pilot valve
will open and the pilot flame should be visible
through the burner sight port.
h. When the pilot flame is established, the flame
safeguard will energize the main valves (indicated
with the Fuel Valve Light), and the burner should
ignite at low fire. This operation of the fuel valves
must be visually checked by observing the valve
stem moving up with a motorized valve or hearing
the clicking noise from a solenoid valve.
NOTE: If the burner is not operating as indicated,
follow the troubleshooting steps to determine the
problem and corrective action.
i. The main flame may not light on the first attempt,
because it must fill the oil lines before providing oil
to the nozzle. Press the reset button on the flame
safeguard to restart the burner.
j. In a few seconds, the combustion analyzer should
have an accurate reading of the O
O
level should be between 4% and 7%, and the
2
nozzle oil pressure should be between 50 and 70
PSIG return line pressure. Do not attempt to fine
tune combustion until the high fire has been set.
DO NOT ATTEMPT TO START THE BURNER WHEN EXCESS OIL
HAS ACCUMULATED, WHEN THE UNIT IS FULL OF VAPOR, OR
WHEN THE COMBUSTION CHAMBER IS HOT.
k. Operate the burner until the boiler is warmed up
and near the operating pressure or temperature.
l. Increase the firing rate, using the potentiometer or
put the low fire hold switch in auto position, while
monitoring and adjusting the O
m. At high fire (end of the modulating motor travel),
adjust the high fire input (open or close the fuel
valve) to match the maximum input and/or pressure
listed on the rating label. The fuel metering valve
should be nearly closed (or closed) at this point and
the nozzle pressure should be at the pressure rating
indicated on the rating label (return line) for the SC.
n. Modulate the burner to low fire, adjusting the O
level as the burner modulates.
p. Adjust the low fire input and air damper adjustments.
q. Re-adjust midfire points for correct emission levels.
r. Adjust the NOx levels at low and midfire rates to
be about 10% under the guaranteed levels or as
required for the gas firing.
s. The burner should be operating at low fire to adjust
the air proving switch. Turn the adjusting screw cw
(in) until the burner trips out (shutdown caused by
the air flow switch). Turn the adjustment screw ccw
(out) 1 ½ turns from the point of shutdown. Check
the operation at higher rates.
t. Adjust the oil pressure switch to trip and shutdown
the burner at a pressure that is 10% lower than the
supply oil pressure.
SC Manual
in the stack. The
2
WARNING
level.
2
5. Air Atomized, #2 Oil Setup
The air atomized oil system has the potential for a large
turndown range similar to gas and has the potential to be
adjusted to different low fire rates. See the burner nameplate
for details on actual rates for this burner.
a. Place the burner switch in the "OFF" position.
b. Place the burner management system in manual mode.
c. Place the burner management system in the low
fire position.
d. Turn the electrical power for the burner, boiler and
related components on.
e. Verify that the oil metering valve is at the nearly
closed position.
f. Turn the burner switch "on". This will start the blower
motor and initiate the purge cycle.
g. When the prepurge sequence is complete and the
low fire start switch is made, the pilot valve will open
and the flame should be visible through the sight port.
h. When the pilot flame is established, the flame
safeguard will energize the main oil valves
(indicated with the Fuel Valve Light), and the burner
should ignite at low fire. This operation of the main
fuel valves must be visually checked by observing
the valve stem moving up with a motorized valve or
hearing the clicking noise from a solenoid valve.
NOTE: If the burner is not operating as indicated,
follow the troubleshooting steps to determine the
problem and corrective action.
DO NOT ATTEMPT TO START THE BURNER WHEN EXCESS
OIL HAS ACCUMULATED, WHEN THE UNIT IS FULL OF
VAPOR, OR WHEN THE COMBUSTION CHAMBER IS HOT.
i. After a few seconds, the combustion analyzer
should have an accurate reading of the O
stack. The O
(see Figure I-1 for O
pressure should be between 5 and 15 PSIG. Do not
attempt to fine tune combustion until the high fire
input has been set.
• The air damper should be positioned for the
2
correct low fire settings.
• The atomizing air pressure can be adjusted
using the air bleed valve.
j. Operate the burner until the boiler is warmed
up and near the operating pressure or temperature.
k.Increase the firing rate, using the manual
potentiometer, while monitoring and adjusting the
O
level. Adjust the oil pressure and atomizing
2
air pressure as needed to reach high fire position.
Page 22
WARNING
level should be between 4% and 7%
2
rates), and the nozzle oil
2
Startup and Operating Adjustments
in the
2
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