FULTON VSRT 50 - Burner Operation and Control

OPERATION  3
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VSRT_IOM_2018-1213
out procedure removes oils, greases and other organic
compounds that may cause erratic water level control
and surging. There are many chemicals on the market
that may be used and our recommendations are as
follows:
 Fulton recommends the use of washing soda
(sodium carbonate) to wash out boilers. Sodium
carbonate (also known as washing soda or soda
ash), Na2CO3 is a sodium salt of carbonic acid.
Called washing soda, soda crystals, or sal soda
in the detergent section of stores, it eectively
removes oil and grease.
 Trisodium phosphate (TSP, E339) is an excellent
degreaser and alternative to washing soda. It is a
white, granular or crystalline solid, highly soluble in
water producing an alkaline solution. The item of
concern is often partially hydrated and may range
from anhydrous trisodium phosphate, Na3PO4, to
the dodecahydrate, Na3PO4·12H2O. Most often
found in white powder form, it can also be called
trisodium orthophosphate or just plain sodium
phosphate.
Adhere to the following when performing boil-out:
1. The boil-out shall include “over-the-top” wasting
of water. A temporary 2” pipe shall be run from
the relief valve tapping to a suitable point of
discharge as required by local jurisdiction(s) to
assure that grease and oils are oated to the
top and out of the unit. Minimum time for the
procedure shall be four (4) hours of constant
water discharge alternating between bottom and
top blowdown. At least two (2) complete bottom
blowdown and complete rells shall be done.
A suitable manner of chemical waste handling
shall be employed to meet local jurisdictional
requirements.
2. Do not introduce steam to the system until
the boiler has been properly boiled out. A
separate line discharged to a safe location is
recommended for steam discharge prior to boil
out completion.
3. On new systems, send condensate returns to the
drain to ensure the new system piping has been
ushed free of debris and is fully clean. If debris
lled condensate is not wasted, additional boil-
out(s) may be required.
Sequence of Operation: Gas Fired
Burners
The burner is of forced draft design. The Sequence of
Operation for the burner is as follows:
1. Check main gas valve, which provides proper
pressure to burner. The maximum is 13.8” w.c. A
step-down regulator may be necessary.
2. Combustion air is delivered by a centrifugal
blower fan. An air switch monitors the pressure
and is part of the ame programmer safety
interlock circuit.
3. The ame programmer monitors the safe
operation of the burner. Functions include pre-
purge of the combustion chamber, provision
of ignition via the ignition transformer and
electrode, opening main gas valves and
providing post-purge of the combustion
chamber.
4. The ame is monitored by a ame sensor. In the
event of insucient, unstable, or non existent
pilot or main ame, the ame sensor will cause a
safety lockout of the ame programmer. Safety
lockout can also be caused if the ame sensor
is improperly positioned or grounded. After
fault has been corrected, reset by pressing the
appropriate reset button on the boiler panel or
the burner controller.
SEQUENCE OF OPERATION:
MODULATED BURNER
The burner is equipped with modulating controls, which will
provide up to a 6:1 turndown of the burner. This system is
linkageless, and operates a fuel control valve, an air control
valve and a variable speed drive to achieve turndown.
Beginning from an o state, and assuming there is a
load on the system, when turning the switch to on, the
following will be the sequence of operations.
1. The ame programmer will engage the blower
motor and begin to open the air buttery to
the purge position. The air switch will prove
ow, and once all devices are in purge position/
speed, and the air switch is made, the ame
programmer will begin to count down the
specied purge time (30 seconds).