Fulton FB-S Horizontal Firetube Boiler - Manual (Page 40)

The Fulton Companies*FB-S Series Manual*Version 2010-0820 rev. 3/5/13
Page 40
e) Oil Pre-heater Tank (for heavy oil burners)
i. The oil preheater tank is mounted on the heavy oil burner ahead of the fan
housing. Its function is to preheat the oil to correct temperature. The unit is
equipped with three thermostats, ‘low temperature’ ‘operating’ and ‘limit’. A
thermometer and hot oil filter are mounted together as one unit on the
top left-hand side of the preheater tank viewed from the rear of the
burner.
f) Air Pressure Switch
i. Each of the gas burners is mounted on an Air Pressure Switch on the
burner scroll. Lack of combustion air, or insufficient air pressure, will stop
the switch completing the circuit, preventing the burner from operating.
g) Air Control
i. The Air Control System of the gas burners is similar to that of the oil
burners. The servomotor is mounted on the rear of the air inlet of the
burner and directly coupled to the air damper blade. This system
monitors and controls the combustion air entering the burner on
the requirement of the boiler heating during operating. The servomotor has
been adjusted by the manufacturer before the boiler delivery, so normally
the customer needn’t set it again.
h) Gas Train Assembly
i. Consist of pilot and main supply line, each line having a manual cock, a
governor, solenoid operated valves and two-air pressure switch (high and
low). The governors maintain a constant pressure of fuel entering the
burner and are adjustable. The solenoid valves are electronically controlled
by the burner programmer. For specific details, consult the burner
manufacturer’s instruction manual.