FULTON VMP40 Installation, Operation And Maintenance Manual page 35

4. When the pilot flame is established, the
flame rod (or ultra-violet scanner)
senses the voltage which is created in
the flame between the flame rod and the
gas nozzle (ground). This signal is
transmitted back to
programmer which opens the main gas
valve giving a main flame.
5. All Fulton propane or butane boilers and
Fulton natural gas boilers 50 HP and
above are standardly furnished with UV
Scanners.
a. If the installation is new or the burner
has been disassembled, the burner
may not fire at the first attempt due to
air which must be purged from the gas
lines. This will result in the burner flame
programmer going to lockout. Repeat
the procedure for starting the burner.
b. The main gas valve will remain open
as long as there is a demand for heat
and the flame is carrying a sufficient
signal to the flame programmer.
c. If the flame is not established at the
start, the safety switch in the flame
programmer control will open the
contacts and shut off the burner.
d. Push the reset button on the control
to reset. If trouble persists, it may be
necessary to check the flame rod
setting or the UV scanner. See
Maintenance Section 4 for procedure
to check flame rod setting or UV
Scanner.
Gas Burner Set Up
For LE Models
WARNING
For units equipped with Flue Gas
Recirculation (FGR), the ducting must
be insulated.
a. Open the manual gas cocks on the pilot
and main lines of the gas head.
b. Switch on the main power to the burner.
The water level relay is equipped with a
manual reset. Depress the button on the
box.
c. The flame programmer is the main
control in the panel box. The programmer
in conjunction with a UV scanner
"supervises" the ignition sequence -
proves the flame is satisfactory, and
finally "monitors" the established flame.
Should any fault occur, either during the
ignition sequence or during normal
running, the programmer will immediately
go to "lock-out" and the burner will shut
down.
d. When the pilot flame is established,
ultra-violet scanner senses the flame.
This signal is transmitted back to the
flame programmer which opens the
main gas valve giving a main flame.
e. If the installation is new or the burner
the flame has been disassembled, the burner may
not fire at the first attempt due to air
which must be purged from the gas
lines. This will result in the burner flame
programmer going to lockout. Repeat
the procedure for starting the burner.
f. The main gas valve will remain open as
long as there is a demand for heat and
the flame is carrying a sufficient signal to
the flame programmer.
g. If the flame is not established at the
start, the safety switch in the flame
programmer control will open the
contacts and shut off the burner.
h. Push the reset button on the control to
reset. If trouble persists, it may be
necessary to check the UV scanner.
See Maintenance Section for procedure
to check UV Scanner.
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 disconnected.
Gas Burner Set Up For
Boilers Equipped with
Modulation
1. Modulation is available as an option on
Fulton gas fired steam boilers for 40 -
150 HP units.
2. Boilers equipped with modulation will
have the linkage rod disconnected
between the modulation motor and the
gas butterfly valve for shipment.
If Seiman linkageless modulation is
ordered, no mechanical linkage rod is
required, thus none provided.
WARNING
NOTE
Operation
3. 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 butterfly
valve to the modulation motor.
4. The end of the linkage arm that attaches
to the butterfly valve will have a notch on
both sides of it, where the swivel collar
should be centered. This setting was
based on factory test fire conditions.
5. Combustion analysis should be done at
the installation to make any changes to
insure proper combustion characteristics.
6. The modulating burner will have a
modulation lock switch to enable you to
lock the firing sequence anywhere along
the firing rate from low to high.
7. Depending on the
characteristics, it may be necessary
to adjust both linkage arms. To adjust
the linkages, unscrew the swivel
collar and move the linkage rod in the
appropriate direction.
8. Standard modulating burners will have a
proportioning pressure
addition to the standard operating
pressure control that will send a 0-135
ohm signal to the modulation motor to
adjust the firing rate. Both operating
pressure controls should have the same
setting.
9. NEMA 4 units will use a digital pressure
controller with transducer as the
operating pressure control which sends
a 0ma signal to the modulation motor to
control firing rate.
Gas Burner Set Up For
Boilers Equipped with
High-Low-Off
1. A gas fired burner equipped for high-
low-off firing is available as an option on
Fulton gas fired steam boilers for 40 -
150 HP units.
2. 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.
3. The linkage will be disconnected from
the gas valve for shipment.
4. 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.
combustion
control in
27
VMP IOM