IM-P402-93 AB Issue 7
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8.10 Alarm low
The low alarm relay is normally wired to sound an alarm, and, in many
cases, to switch off the burner. Always consult the boiler manufacturer for
a recommended low alarm level.
Note:- Additional low level alarms are normally fitted to the boiler.
The alarm level is normally set below the lower limit of the 'CONTROL
BAND', but above the 'MINIMUM LEVEL':-
Also see Figure 19, on page 22.
8.11 Alarm high
A high alarm warns that the boiler water level is higher than the manufacturer's
specified limit, and that consequently, carryover could occur.
The high alarm relay will normally be wired to sound an alarm, and sometimes to
stop the feedpump.
It is possible to wire the system so that the burner is also switched off, but we
recommend that the boiler manufacturer is consulted for the preferred option, as
well as to define the high alarm level for the boiler. The alarm level is normally set
above the higher limit of the 'CONTROL BAND', but below the 'MAXIMUM LEVEL':-
Also see Figure 19, on page 22.
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