Fulton Vertical Tubeless (FT-A) Thermal Fluid (hot oil) Heater - Manual (Page 51)

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SECTION 3
FTA-IOM-2013-0227
OPERATION
3-11
6. When the fl uid temperature reaches the set point of the temperature
controller or of the optional operating limit controller, all fuel valves will
close and the fl ame programmer will advance to the post purge cycle.
When the postpurge cycle begins, the modulating motor will be in the low
fi re position. At the end of postpurge, the burner motor stops and the entire
system is ready for restart on demand.
OIL FIRED BURNER
The following refers to the design and operation of the on/off burner utilizing
fuel oil which requires no preheating. This burner is of high pressure, mechanical
atomization design.
The sequence of operation is as follows:
1. An oil pump is used to obtain necessary atomizing pressure before the fuel
oil reaches the nozzle. The fuel oil is divided into fi ne particles in the nozzle
and imparted with a rotating motion before escaping from the nozzle as a
cone of fi nely atomized oil.
2. Combustion air is supplied by a centrifugal fan. A damper provides
throttling of the inlet opening. The air from the fan reaches the burner
head after going through a turbulator, accomplishing correct distribution
and mixture of air and atomized fuel oil.
3. An electric spark between two electrodes provides ignition of the
atomized mixture, except where code requires a gas pilot. This spark is
produced by a high voltage transformer.
4. The fl ame programmer circuit controls normal operation of the burner.
The sequence includes purging of the combustion area for a set period,
ignition and opening of magnetic valves on the oil circuit; post-purge of
combustion area and return to re-start position.
5. A scanner mounted on the burner casing and facing the light of the fl ame
monitors the fl ame.
6. Safety lock out occurs within a preset minimum time in the event of
insuffi cient, unstable or non-existent fl ame. After fault has been corrected,
reset programmer by depressing the reset button on the casing of the
burner control box.
7. Proper fuel pressure at the burner nozzle is essential. The correct fi ring rate
is obtained by setting the fuel oil pump to give the design pressure for
each unit. This is done at the factory. Pressure is measured by connecting
a 0-400 PSI (0-25 bar) test pressure gauge to the gauge connection on the
fuel pump. The fuel pressure gauge indicates the pressure of the fuel at the
burner nozzle.
8. Typical pressures range between 160-270 PSI (12-18.6 bar). Note the
correct setting upon commissioning. Gauge readings should be recorded
at start-up and checked periodically.
!
WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct, and strict
adherence to applicable jurisdictional/
professional codes and regulations.
Non-Fulton product information is
for reference purposes only. No Fulton
document may substitute for full review
of documentation available from the
component manufacturer.
4
CAUTION
Unburned oil, unlike gas, does not leave the
combustion chamber during purge.