FULTON FB-A 10, Instruction, Operation And Maintenance Manual, Page: 56 / 102

47-G 1/01
Operation
Gas Burner Set Up For Boilers
Equipped with High-Low-Off
a)
A gas fired burner equipped for
high-low-off firing is available as an
option on Fulton gas fired steam
boilers for 30 -100 HP units only.
b) Boilers that have a high-low-off
firing rate will have a linkage
between the high-low gas valve and
the primary air gate. This valve is
equipped with a spring return.
c) The linkage will be disconnected
from the gas valve for shipment.
d) Mount the gas train on the pipe
nipple of the burner plate with the
gas train inlet directly facing over the
panel box. Reconnect the linkage
from the primary air gate to the high-
low gas valve.
e) The end of the linkage arm that
goes to the gas valve will have a
notch on both sides of where the
swivel collar should be centered.
This setting was based on factory
test fire conditions.
f) Combustion analysis should be
done at the installation to make any
changes to insure proper combus-
tion characteristics.
g) To adjust the linkage, unscrew
the swivel collar and move the link-
age rod in the appropriate direction.
The high-low-off configuration comes
with two operating pressure controls.
h) Set the low operating pressure
control to approximately 60% of your
desired set point and the main oper-
ating pressure control to your
desired set point.
Gas burner equiped with high-low-off firing
Panel Box for Boilers equiped with high-low-off firing
Low firePressure Control
Night Heating Pressure Control (Optional)