6 | EN
Copyright © Liberty Pumps, Inc. 2022 All rights reserved.
5595000B
Prepa ra tion
Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
Install Pump Control and Alarm Floats
The water level in the sump is determined by the placement of the
control floats and should be positioned such that the motor
housing is completely submerged to properly cool the motor. If
full submersion is not possible, the minimum water depth shall be
no less than 13” as measured from the bottom of the pump legs.
The upper water level should be positioned to minimize pump
starts. The alarm float should be above the turn
-
on float switch
but below any inlets.
Set the second (turn-on) control above the lower turn-off control.
The exact distance between the two floats must be a compromise
between a frequent pumping cycle (10 starts per hour max) to
properly manage sewage level, and a longer pump run duration
per start, which maximizes energy efficiency. This distance shall be
determined by the engineer, depending on the conditions of the
application.
Prepare Basin
If replacing a previously installed pump, prepare the basin by
removing the old pump and cleaning any debris from the sump.
Inspect all remaining equipment in the basin including guide rails,
piping, valves, and electrical junction boxes (if present) and repair
or replace as appropriate. Ensure that control hardware such as
floats or pressure transducers are clean, properly adjusted, and in
good working order.
Cutter and Impeller Free Movement Check
Wear Personal Protective Equipment to protect hands as
cutter blades have extremely sharp edges and present a
serious cutting hazard.
Do not connect any power to pump until this check is
complete.
Manually rotate the cutter to check that it spins freely
with very little resistance. The cutter is located on the bottom of
the pump. The cutter can be carefully rotated by hand, or rotated
by inserting a tool into the cutter bolt. If rotating by hand, be sure
to wear protective gloves as the cutter and cutter plate have sharp
edges. The pump can remain upright or can be laid down on its
side for easier access to the cutter. Besides verification that the
cutter and impeller are freely spinning, rotating the cutter helps to
lubricate the shaft seals if the pump has been non-operational for
more than a week. It is recommended to rotate the cutter 5–10 full
rotations.
Insta lla tion
All installation and maintenance of pumps, controls,
protection devices, and general wiring shall be done by
qualified personnel.
All electrical and safety practices shall be in accordance with
the National Electrical Code
®
, the Occupational Safety and
Health Administration, or applicable local codes and
ordinances.
For pressure sewer applications
, verify a Redundant Check
Valve Assembly (curb stop and check valve) is installed
between the pump discharge and the street main, as close to
the public right-of-way as possible, on all installations to
protect from system pressures.
Electrical Connections
With main power disconnected, complete pump and control
wiring connections per wiring diagrams included with the control
panel and Figure
2. Verify connections. Check all wires
for unintentional grounds after the connections are made.
3-Phase Pump Rotation Verification
Verify 3-phase pumps for correct rotation prior to installing
pump(s) in basin. To change rotation, reverse any two of the
three power leads to the pump (not the ground). Code the
wires for reconnection after installation.
3-phase power uses three separate
alternating currents that peak at
different integrals. With pumps that
are powered by 3-phase electric, the
phase sequence of the motor must
match the phase sequence of the
power source. When the phase
sequences match, the pump
operates properly. However, when
the phases are out of order, the
pump runs backwards (i.e., the
impeller rotates in the wrong
direction). This causes an extreme
loss of performance and could raise
the current draw, which could result
in tripping an overload or circuit
breaker.
To ensure that the power to the pump is installed correctly, always
verify proper rotation
before
lowering it into the sump. If the
pump is rotating in the wrong direction, turn off the power and
reverse any two leads. This reverses the phase sequence and
corrects the pump rotation.
For 3-phase pumps, rotation must be
clockwise when looking from the top of the pump. The correct
direction is also stamped on the bottom of the volute.
RISK OF ELECTRIC SHOCK
RISK OF SERIOUS INJURY OR DEATH
RISK OF ELECTRIC SHOCK
Correct Impeller Rotation
TOP VIEW
ROTATION
KICKBACK
