Fulton Edge ICX or FB-F Vertical Tubeless Boilers (Steam), Gas Fired - Manual (Page 57)

48-G 0/01
Operation
WARNING
Prior to the commencement of any
work requiring the removal of
cover plates and the opening of the
control panel box, the electrical
supply to the boiler must be dis-
connected.
Primary Air Adjustment for Fulton
Gas Fired Steam Boilers
a) The primary air adjustment or main
air control is located at the fan hous-
ing face. This control is used to sup-
ply the burner with excess air needed
to facilitate good combustion. Too
much or too little air will result in poor
combustion. It is important to make
sure the lowest level of excess oxy-
gen is present while still maintaining a
high level of carbon dioxide and neg-
ligible carbon monoxide. Using a
CO
2
or O
2
tester it is possible to
determine the percent of excess air in
the combustion mixture.
b) It is a good policy on a gas fired
unit to have between 3.5% and 4%
oxygen present in the combustion.
This will give you 10.5% to 9.5% car-
bon dioxide. The carbon monoxide
level should always be less than
400 PPM.
Secondary Air Adjustment
Procedure for Fulton Gas Fired
Steam Boilers
a) The secondary air control adjust-
ment is located on the top, right-hand
side of the burner assembly. This
damper type air controller is used to
introduce air to and through the blast
tube of the burner. The purpose of
the secondary air adjustment is to
proportionately divide the air to the
center or outer fire chamber. By mov-
ing the damper closed, the air is
forced to the outside of the fire
chamber with less air going down the
blast tube area. By pulling the
damper open more air is forced
down the blast tube and less on the
outside wall of the deflector face and
fire chamber.
b) It is important in the combustion
process to maintain proper air mix-
tures between the outer surface and
center of the blast tube area. On
most boilers the damper is locked in a
wide open position. However, if it is
necessary to close the damper, care
should be taken to close the damper
slowly and no more than 1/4 of the
distance of the swing of the damper
assembly.
c) A visual examination down the
blast tube should reveal that no heat,
flames or fumes are backing up
through the burner plate area. If they
are, the secondary damper must be
opened up once again. Failure to
remove the flame or gases from the
blast tube area can cause a backfire
as well as cause premature failure of
electrodes, flame rods, and other
burner components.
d) A visual inspection down the burn-
er view port should also show the fire
completely covering the furnace
walls. If the fire is tunneling down or
is not to the outside wall of the fur-
nace, the efficiency will drop off.
Close the secondary air damper until
tunneling stops.
Primary Air Adjustment is located at the fan housing face
Blast Tube
Viewing Port
Burner
Viewing Port
Secondary Air Adjustment 40-60 HP
Secondary Air Adjustment 4-30 HP