Alarm control, Change-over switch
(7)
Charging-pump control
(5)
Charging-pump control + low level alarm
(3)
Charging-pump control + isolated low level alarm
(3)
Charging-pump control + high and low level alarm
(2)
Discharging-pump control or pump prevention
(4)
Discharging-pump control + high level alarm
(4)
Discharging-pump control + isolated high level alarm
(3)
Discharging-pump control + high and low level alarm
(2)
Low level alarm or valve control
(1)
High level alarm or valve control
(1)
High and low level alarm control for expansion tank
(2)