Installation
Model API 3171 Installation, Operation, and Maintenance Manual
24
How float controls work
The on and off levels of the Square D 9036 simplex and the Square D 9038 duplex are
controlled by adjusting the collars (335). As the liquid level rises, the float rises to contact the
upper collar and the upward movement of the float rod causes the mechanical switch inside the
control to close. This completes the circuit to the starter. Operation continues until the liquid
level drops low enough for the float to contact the lower collar. This pulls the rod down, opening
the switch and turning off the pump.
The only difference between the Square D 9036 simplex and the Square D 9038 duplex is in
the operating sequence. For the Square D 9038 duplex, the first pump starts as the water level
rises. This allows the float to contact the upper collar. When the water level drops down and
shuts off the first pump, a lever arm inside the control mechanically switches to the second
pump and it comes on for the next cycle.
If the first pump fails to keep up with demand, or not come on at all, then a continued rise in the
level turns both pumps on. Both pumps run until the low-water level is reached. If both pumps
are unable to keep up with the demand, then an optional high-water alarm switch can be
supplied in the alternator to close a switch if the water level rises past the second pumps on the
level. This switch can be wired into a customer-supplied alarm horn or light.
APEX high level alarm
The APEX high level alarm is an independent device used to sense fluid level and close a
switch that activates a separate alarm. The switch is mounted on a pipe above the support
plate. The pipe must extend into the sump 10 to 15 cm | 4 to 6 in. below the required actuation
point. As the liquid level rises in the pipe, trapped air causes bellows inside the switch to inflate
and trip a microswitch. The switch can then activate a light, horn, relay, solenoid valve, or other
electric device.
Figure 11: High water alarm
1.
High water alarm
2.
Reducing adapter, 13.0 mm x 26.0 mm | 0.5 in. x 1.0
in.
3.
Nipple, 26.0 mm | 1.0 in.
4.
Coupling, 26.0 mm | 1.0 in
5.
Pit cover
6.
Pipe, 26 mm | 1.0 in, 204 mm | 8.0 in. shorter than
the pump length
7.
Cut the pipe 64 mm | 2.5 in. below the required
switch actuation point
Magnetrol displacer-type liquid level switch
The Magnetrol displacer-type liquid level switch is closed by a magnetic seal inside a sealed
tube. Switch operation is controlled by the buoyancy of weighted displacers suspended on a
spring. As liquid level rises, the resulting change in buoyancy moves the spring upwards. The
spring movement causes a magnetic sleeve to attract a pivoted magnet, closing the actuating
switch. Refer to installation guide supplied by the manufacturer for proper installation and
configuration.
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