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10, using the air damper positions defined by oil, and adjust-
ing the gas input to match the air damper settings.
If the burner is equipped with an optional multiple set-point
modulating motor or parallel positioning, the low and high
fire rates, as well as lightoff rates, can be set independently
for each fuel. In this case, the gas is adjusted first, to set the
air damper locations for gas firing, as defined in Section 10.
Once gas is set, oil is setup as defined in Section 11, except
that the multipoint modulating damper motor is adjusted to
bring the low fire air setting to match the oil needs.
There are several different options available that can alter
the exact setup details, and these must be evaluated prior
to startup so that the procedures can be adjusted accord-
ingly. The procedures given are for linkage systems. Par-
allel positioning (linkageless) systems allow for much more
flexibility in the fuel, air and FGR settings on each fuel, and
can be tuned to better match each fuels needs. The setup
details for linkageless controls will follow the same general
sequence, but differ in specifics for setting the valve posi-
tions.
8. Combination Gas and Air Atomized #2 Oil
Combination burners, firing both gas and oil, require some
compromises in the setup because they share common con-
trols for both fuels. Air atomized #2 oil firing can have turn-
downs and air damper positions very similar to gas firing,
simplifying the setup. If the burner is equipped with FGR,
gas must be started first to set the FGR control valve po-
sitions to obtain the correct NOx performance. If there is
no FGR, either fuel can be started first, however the setup
cannot be finalized until both fuels have been reviewed to
determine the air damper positions. Follow the setup proce-
dures defined in Section 10 for gas setup and Section 12 for
air atomized oil setup.
If the burner is equipped with an optional multiple set-point
modulating motor, the low and high fire rates, as well as ligh-
toff rates, can be set independently for each fuel. In this
case, the gas is adjusted first, to set the air damper locations
for gas firing, as defined in Section 10. Once gas is set, oil
is setup as defined in Section 12, except that the multipoint
modulating damper motor is adjusted to bring the low fire air
setting to match the oil needs.
There are several different options available that can alter
the exact setup details, and these must be evaluated prior
to startup so that the procedures can be adjusted accord-
ingly. The procedures given are for linkage systems. Par-
allel positioning (linkageless) systems allow for much more
flexibility in the fuel, air and FGR settings on each fuel, and
can be tuned to better match each fuels needs. The setup
details for linkageless controls will follow the same general
sequence, but differ in specifics for setting the valve posi-
tions.
9. Combination Gas and Heavy Oil
Combination burners, firing both gas and oil, require some
compromises in the setup because they share common con-
trols for both fuels. Heavy oil burners cannot operate with
JB Manual
FGR and do not have this adjustment. If the burner does
not have a multiple setpoint modulating motor or link-
ageless control, oil must be set first, as the air damper
positions will be determined by this setup. With the mul-
tiple setpoint modulating motor, gas must be set first, as
it will dictate the damper positions. In either case, setup
cannot be finalized until both fuels have been reviewed
to determine the air damper positions. Follow the setup
procedures defined in Section 10 for gas setup and Sec-
tion 13 for air atomized heavy oil setup.
There are several different options available that can al-
ter the exact setup details, and these must be evaluated
prior to startup so that the procedures can be adjusted
accordingly. The procedures given are for linkage sys-
tems. Parallel positioning (linkageless) systems allow
for much more flexibility in the fuel, air and FGR settings
on each fuel, and can be tuned to better match each fu-
els needs. The setup details for linkageless controls will
follow the same general sequence, but differ in specifics
for setting the valve positions.
10. Gas Setup
a. Place the burner switch in the "OFF" position
b. Place the "Auto-Manual" switch in the manual posi-
tion, for modulation or low fire hold, switch in low fire po-
sition for Lo-Hi-Lo operation. If this is a combination fuel
burner, make sure the fuel selector switch is on "GAS".
c. Place the manual flame control potentiometer in the
MIN (low fire) position on modulating units.
d. Close the downstream manual shutoff valve (closest
to the burner head) on the gas train.
e. Turn the electrical power on for the burner, boiler and
related components.
f. Verify that the gas metering valve is nearly closed, the
vent valve (if equipped) is operating and the gas pilot
valve is not open (the solenoid will hum and feel warm).
g. If equipped with FGR, verify that the FGR control
valve is in the near closed position. A linkage system
should have the shutoff FGR valve in the closed posi-
tion.
h. Turn the burner switch on. This will start the blower
motor and initiate the prepurge cycle.
i. 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
sight port.
j. When the pilot flame is established, the flame safe-
guard will energize the main gas valve (indicated with
the Fuel Valve Light). This operation of the main fuel
valves must be visually checked by observing the valve
stem operation.
k. After the timer has completed the trial for main flame,
the burner will go out on alarm (the closed manual gas
valve prevented the burner from lighting). At this time,
the gas valves must be visually checked to verify that
they have closed. This test sequence proves the proper
operation of the primary control.
l. Press the reset button and restart the burner. When
the pilot has started, open the manual gas valve to allow
Page 35
Startup and Operating Adjustments
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