Relay Unit Location
• When the water level drops below
E
2
, the lower-limit indicator turns
ON and the alarm sounds (U
2
indicator OFF).
• When the water level reaches E
2
,
the alarm turns OFF and the
intermediate indicator turns ON
(U
2
indicator ON).
• When the water level rises to E
1
,
the upper-limit indicator turns ON
and the alarm sounds (U
1
indicator ON).
Principles of Operation