Franklin Electric 93791010 Manuel Du Propriétaire page 4

an excessive force is placed across the pump-motor
assembly that can cause impeller damage, motor or
pump shaft breakage, excessive bearing wear, etc.
B. Upthrust - With no check valve, a leaking check
valve, or drilled check valve, the unit starts under a zero
head condition. This causes an uplifting or upthrust on
the impeller-shaft assembly in the pump. This upward
movement carries across the pump-motor coupling and
creates an upthrust condition in the motor. Repeated
upthrust can cause premature failure of both the pump
and the motor.
C. Water Hammer - If the lowest check valve is more than
30 feet above the standing (lowest static) water level, or a
lower check valve leaks and the check valve above holds,
a vacuum is created in the discharge piping. On the next
pump start, water moving at very high velocity fills the void
and strikes the closed check valve and the stationary water
in the pipe above it, causing a hydraulic shock. This shock
can split pipes, break joints and damage the pump and/
or motor. Water hammer can often be heard or felt. When
discovered, the system should be shut down and the pump
installer contacted to correct the problem.
REMOVABLE POPPET CHECK VALVE
Some submersible pumps are supplied with a
REMOVABLE check valve assembly for applications
where the pump can become air locked. If the pump is
supplied without a check valve, or if the check valve is
removed, a spring-loaded inline check valve should be
installed roughly 10 to 20 feet (3 to 6.09 meters) above
the pump. This allows for the repriming of the pump
after the pump has run out of water.
W A R N I N G
Fluid draining back through the pump
can cause the pump to rotate backwards. If pump/
motor starts during this time; damage to the pump
can occur.
The check valve can be removed with the use of the
T-Handle Poppet Wrench (part no. 23498207), ordered
separately, or, with standard needle nose pliers. The
poppet assembly is left hand threaded and is removed
by turning CLOCKWISE.
If reinstalling a Popppet Check Valve assembly, the
assembly should be tightened to 15 inch-pounds.
4
Poppet Assembly
INSTALLATION OF PUMP, DROP PIPE, AND
ASSOCIATED EQUIPMENT
Fig. 1 illustrates a typical well installation showing in-
ground components. Franklin recommends the following
procedure when installing the pump and drop pipe:
1. Prior to fastening the pump/motor assembly to
the drop pipe, confirm that the motor's lead wires
are securely housed under lead guard which was
supplied with the pump. Fastening screws have been
provided for use during the lead guard's installation.
2. Fasten the submersible cable to the drop pipe with
clamps or appropriate tape every 10 ft. (3m) to
prevent tangling and damage to the cable. The cable
must remain slack when using plastic drop pipe to
allow for stretching of pipe when installed in the well.
3. Take care not to scrape or pinch the submersible
cable against the well casing.
4. Use an ohmmeter or megger to make insulation and
continuity checks on the cable once the pump is
installed. This locates any fault in the cable.
5. Make sure system check valves are installed
properly. See previous sections of this manual for
further information on check valve placement, type,
and troubleshooting.
6. Install a torque arrestor just above the pump to
prevent chafing the cable when pump and pipe twist
during starting and stopping.
7. Attach a safety cable to pump to prevent loss of
pump if pipe should break.
NOTICE: IT IS RECOMMENDED THAT STEEL CABLE
BE USED FOR THE PURPOSES OF SECURING THE
PUMP. 3/16" DIAMETER TO 1/4" DIAMETER BRAIDED
STEEL CABLE IS SUFFICIENT TO SUPPORT MOST
PUMP/MOTOR SYSTEMS. IT IS ALWAYS BEST TO
CONFIRM THAT THE PUMP/MOTOR SYSTEM DOES NOT
EXCEED THE MAXIMUM WEIGHT LIMIT OF THE CABLE
SELECTED.
8. Place a sanitary well seal or pitless adapter with
an approved cover plate over top of well per
manufacturers recommendations.
9. Keep pump at least 5' (1.5m) from bottom of well and
above well screen or casing perforations.
T-Handle Poppet Wrench