FULTON VSRT Series Installation And Operation Manual page 54

3 - OPERATION
point in the sight glass. Once the secondary level
cut-off is tripped, a light on the panel will become
illuminated.
2. Do not push the manual reset button for the low
water safety cut-off at this time. Refill the boiler
first.
3. Once boiler is refilled, turn the boiler ON switch.
With the low water cut-off light still illuminated,
the burner should not turn on.
4. Push the low water reset button. Once this button
is reset, the burner should begin the pre-ignition
process as long as all other safety interlock
devices are satisfied.
HIGH LIMIT PRESSURE SWITCH
Perform the following to test:
1. With burner on and the boiler under pressure,
lower the set pressure on the switch until it
trips and shuts down the burner. Be sure that
the pressure is the same as the boiler operating
pressure.
2. To test the manual reset button, wait until the
boiler has fully completed the post purge phase.
Once the boiler is in standby position, reset the
switch to the original set point.
3. Press the manual reset switch on the pressuretrol.
This will ensure that the manual reset switch is
functioning correctly. The burner should not start
until the reset button is pressed.
OPERATING PRESSURE LIMIT SWITCH
Perform the following to test:
1. With the boiler under pressure, lower the set
pressure on the switch until it trips and shuts
down the burner. Be sure that the pressure is the
same as the boiler operating pressure.
2. This switch is an auto reset. Reset the switch to
the original set point. The burner should turn
back on automatically.
FLAME SCANNER
Perform the following to test:
1. Verify that the flame scanner is observing flame
with the burner running by confirming that a
flame signal is present with a flame in the boiler.
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2. Shut down the burner.
! WARNING
Do not shut off gas supply with the burner running.
This is extremely dangerous. Damage to the boiler/
burner may occur.
3. Close both the main gas supply isolation valve
and gas pilot line isolation valve.
4. Turn the burner on. This will cause a flame failure
and verify that the pilot flame failure function is
operating correctly.
5. Turn the boiler off and open the gas pilot line
isolation valve. This will allow for the burner to
cycle though the pilot light off and test main
flame failure. Turn the boiler off after this test is
complete.
Note: On smaller boilers, the pilot flame will be sufficient
to allow the boiler to cycle through the main flame test.
If this occurs, shut the pilot line isolation valve. This will
cause the boiler to fail on main flame.
6. Once boiler is completely off and has completed
the post purge cycle, open the main gas supply
valve and normal boiler operation can be
resumed.
MODULATING CONTROLS
All boilers are standard-equipped with modulating
controls.
The modulating pressure controller continuously
regulates the burner between the minimum firing
rate and high fire. When the unit is on low fire and the
pressure continues to climb past the setpoint, the boiler
will shut down. It will typically re-start when the process
pressure drops below the setpoint.
PRESSURE RELIEF VALVE
Located on the boiler, this valve limits the maximum
operating pressure of the equipment.
SIGHT GLASS ISOLATION VALVES
The brass sight glass isolation valves are equipped with
an internal ball check. In the event that a sight glass
should break, the ball will set, preventing discharge of
© Fulton 2018