Fulton FB-S Horizontal Firetube Boiler - Manual (Page 53)

The Fulton Companies*FB-S Series Manual*Version 2010-0820 rev. 3/5/13
Page 53
Low Water alarm. This is normal and typical of ‘priming’ where a boiler tries
to maintain an overload condition resulting in unstable water conditions.
7. Fault Finding
Before calling the Fulton Service Department, check the following:
a) Gas isolating valve(s) OPEN (gas and dual fuel burners).
b) Oil isolating valve(s) OPEN (gas and dual fuel burners).
c) Oil storage tank contains an adequate level of fuel.
d) Oil filer(s) are not blocked.
e) Water feed line from feed tank/hotwell is OPEN.
f) Water feed isolating valve on boiler is OPEN.
g) All blowdown valves are SHUT.
h) Fuses or MCBs in the main supply are not tripped.
i) Thermal overload on the pump motor is not tripped.
j) Thermal overload on the burner motor is not tripped.
k) Normal water level is visible in the water level gauges.
l) Feed pump is primed and not air locked.
m) Front door proof of closure microswitch is closed.
Before calling the Fulton Service Department, have the following information available:
a) The model and size of the boiler.
b) The boiler serial number.
c) The model and type of burner fitted.
Note
A very common problem is that when a boiler cools down, the steam in
the steam space condenses and gradually forms a vacuum. If the feed water
line is open, the boiler will draw in water in an attempt to equalize the
pressure. The appearance in the water level gauges is the same if they are
empty or fully flooded. If the sight glasses appear empty, but the water level
control alarm(s) have not sounded, it is highly probable that the boiler is
flooded. Allow air into the system and drop the water to the normal operating
level by opening a blowdown valve. Installing a vacuum breaker on the boiler
or steam header will not allow a vacuum condition to occur as a boiler cools
down.