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PAGE 12 — ST-4125D/ST-6125D SUBMERSIBLE PUMPS — OPERATION AND PARTS MANUAL — REV. #1 (06/12/08)
ST-4125D/ST-6125D — FLOAT SWITCHES
Float Switch Theory
There is a tilt-sensitive mercury switch hermetically sealed within
each float. As the liquid level (water) rises or falls, the float changes
its angle until the mercury switch makes (close) or breaks (open)
the circuit.
The length of cord between the float and point of attachment
determines the amount of water to be pumped.
Figure 3. Dual Float Control Switch
Float Switch (Dual)
Float switches (Figure 3) are used for the unattended operation
of the submersible pump. The ST-4125D and ST-6125D pumps
require the use of a control box to perform this function. Shown
in Figure 3 is an example of a dual float control switch application.
The Models ST-4125D and ST-6125D submersible pumps
require one each of the Model SW-1WOPA float type mercury
switches. These switches have a pumping range level between
5.5~18 feet (1.67~5.5 meters). All float switch connections are
bare wire (no plug). The ST-4125D/ST-6125D uses the
CB12
control box for 230V
and the
CB14 control box for 460 V
when float switches are required for the job application.
Contact Multiquip sales department to order float switches.
CONTROL
BOX
EXTERNAL 3-PHASE
(230 OR 460 VOLT)
POWER SOURCE
CIRCUIT
BREAKER
RED
WHITE
BLACK
L1
L2
L3
GREEN
GROUND
SUBMERSIBLE
PUMP
ST-6125D
LIFTING
CHAIN
4 or 6-INCH
DISCHARGE
HOSE
POWER
CORD
SUPPORT
PLATFORM
LOW
ER
PUMP
ON
PUMP
OFF
FLOAT
SWITCHES
CAUTION!
HIGH
VOLTAGE!
CAUTION!
HIGH
VOLTAGE!
CB12/14
RESET