Steam Pressure Controls - FULTON RB Series Installation, Operation And Maintenance Manual

OPERATION - 3
Burner Programmer
Is located in the burner mounted control panel. Acts in conjunction with a sensing device
to 'supervise' the ignition sequence, prove the flame is satisfactory and finally 'monitor' 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 both main and pilot gas/oil valves
will shut to isolate the fuel lines to the burner.
Air Pressure Switch (Gas and Dual Fuel Burners only)
Mounted on the burner, this switch is operated by the pressure of air entering the burner through
the throat of the scroll. Lack of combustion air, or insufficient air pressure, will stop the switch
completing the circuit, preventing the burner from operating.
Gas Train Assembly
Consists of pilot and main supply lines, each line having a manual cock, a governor and solenoid
operated valves. The governors maintain a consistent 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 manufacturers Instruction Manual.
Note: Boilers fitted on skid systems and in plantrooms are interlocked with the feedwater and condensate return
tank, after switching the boiler on at the boiler control box isolator switch, the reset button on the tank control box
must be reset. This reset must also be selected after any electrical outage.
3.2.2

STEAM PRESSURE CONTROLS

Pressure controls are mounted on the side of the control box together with a syphon pipe,
pressure test point and steam pressure gauge.
Pressure controls are as follows:
Control Pressure On/Off Switch
Controls the ON/OFF cycle of the burner, switching the burner off when the desired steam
pressure is reached and switching it on when steam pressure falls.
High Limit Switch
Should the Control Pressure Switch fail, the steam pressure will raise above the preset limit
causing the High Limit Switch (set at least 0.5 barg higher than the Control Pressure Switch)
to switch off and lock out the burner.
A High Limit Indicator will illuminate and an alarm will sound.
Should this happen, switch the boiler to pump only and wait until the steam pressure is
discharged. Check the connection to the pressure switch, replace as required.
High/Low Pressure Switch
Air pressure transducer for fully modulated burners switches the burner from high to low flame
and vice-versa.
Provides a proportional control signal to the burner combustion control.
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Fulton Ltd
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