Fulton FB-S Horizontal Firetube Boiler - Manual (Page 37)

The Fulton Companies*FB-S Series Manual*Version 2010-0820 rev. 3/5/13
Page 37
100mm diameter standpipes mounted on top of the boiler center line
towards the front of the boiler. A standard boiler is fitted with Feedwater
pump On/Off, 1
st
Low Water, 2
nd
Low Water and High Water probes.
Note
If the Level Control System is a float type or pressure differential transmitter,
then refer to specific spec sheets located in this manual.
f) Steam Pressure Controls
i. Three steam pressure controls are mounted on the side of the boiler near
the control panel. These are as follows:
a. Operating Control Pressure On/Off Switch. Controls the
on/off cycle of the boiler, switching the burner off when
the desired steam pressure is reached and switching it
on when steam pressure falls.
b. High Limit Switch. Should the Control Pressure Switch
fail, the steam pressure will raise above
the pre-set limit causing the High Limit Switch (set a
least 0.5 {3-4 psig} bar 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.
c. Modulating Pressure Switch. Switches the burner from high
to low flame and vice-versa as steam pressure/water temp
increases or decreases from setpoint.
2
nd
LWCO
Pump On
1
st
LWCO
Pump Off
High Water