These are the main water levels:
High Water:
A high water level, although not dangerous is undesirable as water may infiltrate the steam header. If
the boiler water level goes above this point the burner may or may not continue to run depending on
the system configuration. If a high water level condition is detected high water audible and visual
indicators are activated to notify the user. The audible indicator may be muted by means of the
mute/reset push button.
Pre High
A pre high level, is a pre warning before the water level reaches the high level. A visible alarm is
shown. The alarm will reset once the water level is below the commissioned value.
Control Point:
Ideal water level regulation point. There are no audible or visual indicators active.
Pre Low
A pre low level, is a pre warning before the water level reaches 1st low. An audible and visual alarm
is indicated. The alarm can be muted via the mute/reset button. The burner will not turn off; alarms will
be reset once the water level is above the commissioned value.
1st Low:
A 1st low water level is a point below the control point at which the burner will turn off. If the water
level falls below this point 1st low audible and visual indicators are activated. The audible indicator
may be muted by means of the mute/reset push button. If the water level is restored above this point
the burner will start automatically and all indicators will also be reset.
2nd Low:
A 2nd low water level is a point below 1st low at which the burner will remain off. If the water level
falls below this point 2nd low audible and visual indicators are activated. The audible indicator may be
muted by means of the mute/reset push button. Even if the water level is restored above this point the
burner will remain off. Operator intervention is required to manually reset the system and can only be
performed once the level is above the 2nd low point. The 2nd low reset condition is non-volatile - if the
system is powered down the reset condition will remain when power is reapplied. In this scenario the
operator reset will still be necessary.
Bottom of probe:
The bottom of probe level is used to identify the point below which the probe cannot obtain a valid
water level, it has no operational use.
Figure 1.2.i Capacitance Probe
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