Liberty Pumps 2LE Series User manual

Copyright © Liberty Pumps, Inc. 2021 All rights reserved.
Installation Manual
Installer:manualmustremainwith owner or
system operator/maintainer.
Prior to installation, record information
from pump nameplate for future reference:
Model:
Serial:
Control Panel:
Mfg Date:
Install Date:
Dealer:
Dealer Ph:
7000 Apple Tree Avenue
Bergen, NY 14416
ph: 800-543-2550
fax: [phone]
www.LibertyPumps.com/LEP
60 Hz
5459000C
2LE-Series
Open 2 Vane
Sewage Pumps
1.5–5 HP
2.5” Solids Handling
3LEV-Series
Vortex Sewage Pumps
1.5–5 HP
3” Solids Handling

2 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5459000C
Contents
Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 | EN
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Operating Constraints . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Model Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Inspection and Storage. . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Pump System Components . . . . . . . . . . . . . . . . . . . . . 4 | EN
Wiring Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 | EN
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 | EN
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 | EN
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 | EN
Maintenance and Troubleshooting . . . . . . . . . . . . . . . 7 | EN
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 | EN
Safety Guidelines
Safety Precautions
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.
Accidental contact with electrically live parts, items, fluid, or
water can cause serious injury or death.
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.
Do not remove cord and strain relief, and do not connect
conduit to pump.
Pump shall be properly grounded using its supplied
grounding conductor. Do not bypass grounding wires or
remove ground prong from attachment plugs. Failure to
properly ground the pump system can cause all metal
portions of the pump and its surroundings to become
energized.
Do not handle or unplug the pump with wet hands, when
standing on damp surface, or in water unless wearing
Personal Protective Equipment.
Always wear dielectric rubber boots and other applicable
Personal Protective Equipment (PPE) when water is on the
floor and an energized pump system must be serviced, as
submerged electrical connections can energize the water. Do
not enter the water if the water level is higher than the PPE
protection or if the PPE is not watertight.
Do not lift or carry a pump or a float assembly by its power
cord. This will damage the power cord, and could expose the
electrically live wires inside the power cord.
The electrical power supply shall be located within the length
limitations of the pump power cord, and for below grade
installations it shall be at least 4 ft (1.22 m) above floor level.
Do not use this product in applications where human contact
with the pumped fluid is common (such as swimming pools,
fountains, marine areas, etc.).
Protect the power and control cords from the environment.
Unprotectedpowerandcontrol(switch) cords can allow water
to wick through ends into pump or switch housings, causing
surroundings to become energized.
Single-phase 200/230V pumps shall only be operatedwithout
the float switch by using the circuit breaker or panel
disconnect.
Some products may have internal capacitors that could cause
shock. Avoid contact with plug ends after removing from
energy source.
This safety alert symbol is used in the manual
and on the pump to alert of potential risk for
serious injury or death.
This safety alert symbol identifies risk of
electric shock. It is accompanied with an
instruction intended to minimize potential
risk of electric shock.
This safety alert symbol identifies risk of fire.
It is accompanied with an instruction
intended to minimize potential risk of fire.
This safety alert symbol identifies risk of
serious injury or death. It is accompanied
with an instruction intended to minimize
potential risk of injury or death.
Warns of hazards which if not avoided will
result in serious injury or death.
Warns of hazards which if not avoided could
result in serious injury or death.
Warns of hazards which if not avoided could
result in minor or moderate injury.
Signals an important instruction related to
the pump. Failure to follow these instructions
could result in pump failure or property
damage.
Read every supplied manual before using
pump system. Follow all the safety instructions
in manual(s) and on the pump. Failure to do
so could result in serious injury or death.
RISK OF ELECTRIC SHOCK

5459000C Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 3 | EN
Do not use an extension cord to power the product. Extension
cords can overload both the product and extension cord
supply wires. Overloaded wires will get very hot and can catch
on fire.
This product requires a separate, properly fused and
grounded branch circuit, sized for the voltage and amperage
requirements of the pump, as noted on the nameplate.
Overloaded branch circuit wires will get very hot and can
catch on fire. When used, electrical outlets shall be simplex of
the appropriate rating.
For cord replacement: power cord must be of the same length
and type as originally installed on the Liberty Pumps product.
Use of incorrect cord may lead to exceeding the electrical
rating of the cord and could result in death, serious injury, or
other significant failure.
Do not use this product with or near flammable or explosive
fluids such as gasoline, fuel oil, kerosene, etc. If rotating
elements inside pump strike any foreign object, sparks may
occur. Sparks could ignite flammable liquids.
Sewage and effluent systems produce and may contain
flammable and explosive gases. Prevent introduction of
foreign objects into basin as sparks could ignite these gases.
Exercise caution using tools and do not use electronic devices
or have live, exposed electrical circuits in or around basins,
open covers and vents.
These pumps are not to be installed in locations classified as
hazardous in accordance with the National Electric Code®,
ANSI/NFPA 70.
Energizing the control panel or breaker for the first time is
potentially dangerous. Licensed electrical personnel should
be present when the panel or breaker is energized for the first
time. If faults caused by damage or poor installation practices
have not been detected, serious damage, injury or death can
result when power is applied.
Do not modify the pump/pump system in any way.
Modifications may affect seals, change the electrical loading
of the pump, or damage the pump and its components.
All pump/pump system installations shall be in compliance
with all applicable Federal, State, and Local codes and
ordinances.
Do not allow children to play with the pump system.
Do not allow any person who is unqualified to have contact
with this pump system. Any person who is unaware of the
dangers of this pump system, or has not read this manual, can
easily be injured by the pump system.
In 200/230V installations, one side of the line going to the
pump is always “hot”, whether the float switch is on or off. To
avoid hazards, install a double pole disconnect near the pump
installation.
Vent basin in accordance with local code. Proper venting of
sewer and effluent gases alleviates poisonous gas buildup
and reduces the risk of explosion and fire from these
flammable gases.
Wear adequate Personal Protective Equipment when working
on pumps or piping that have been exposed to wastewater.
Sump and sewage pumps often handle materials that can
transmit illness or disease upon contact with skin and other
tissues.
Do not enter a pump basin after it has been used. Sewage and
effluent can emit several gases that are poisonous.
Do not remove any tags or labels from the pump or its cord.
Keep clear of suction and discharge openings. To prevent
injury, never insert fingers into pump while it is connected to
a power source.
Do not use this product with flammable, explosive, or
corrosive fluids. Do not use in a flammable and/or explosive
atmosphere as serious injury or death could result.
This product contains chemicals known to the State of
California to cause cancer and birth defects or other
reproductive harm. www.p65warnings.ca.gov.
This pump has been evaluated for use with water only,
however use with human waste and toilet paper is permitted.
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.
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.
Do not dispose of materials such as paint thinner or other
chemicals down drains. Doing so could chemically attack and
damage pump system components and cause product
malfunction or failure.
Do not use pumps with fluid over 104°F (40°C). Operating the
pump in fluid above this temperature can overheat the pump,
resulting in pump failure and excessive cavitation.
Do not use pump system with mud, sand, cement,
hydrocarbons, grease, or chemicals. Pump and system
components can be damaged from these items causing
product malfunction or failure. Additionally, flooding can
occur if these items jam the impeller or piping.
Do not introduce any consumer item that is not toilet paper
into a non-grinder (dewatering, effluent, sewage) pump/
pump system. This includes, but is not limited to the
following:feminineproducts,wipes, towels, towelettes, dental
floss, swabs, pads, etc. Items such as these put the pump
under undo strain and can result in pump/pump system
failure. Additionally, it creates conditions for discharge line
blockage.
Do not run dry.
The Uniform Plumbing Code® states that sewage systems
shall have an audio and visual alarm that signals a
malfunction of the system, to reduce the potential for
property damage.
Keep pump upright.
At no time shall the pump be stored within an incomplete wet
pit. The pump shall not be placed into the pit until it can be
fully operational.
RISK OF FIRE
RISK OF SERIOUS INJURY OR DEATH

4 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5459000C
Model Specifications
For complete listing of models and their specifications, refer to
http://www.LibertyPumps.com/lep/About/Engineering-Specs.
Pump nameplate provides a record of specific pump information.
Inspection and Storage
Initial Inspection
The shipping container should be immediately inspected for
damage that may have occurred in shipment. Exercise care in
opening the shipping container to avoid damage to the pump.
1. Visually check the pump and any spare parts for damage.
2. Check for damaged electrical wires, especially where they exit
the motor housing.
Contact Liberty Pumps customer service to report any damage or
shortage of parts.
Storage Before Use
Protect the power and control cords from the environment.
Unprotectedpowerandcontrol(switch) cords can allow water
to wick through ends into pump or switch housings, causing
surroundings to become energized.
At no time shall the pump be stored within an incomplete wet
pit. The pump shall not be placed into the pit until it can be
fully operational.
LEP-Series pumps are shipped from the factory ready for
installation and use. The pump shall be held in storage if the
pump station is not complete. If storage is necessary, the pump
should remain in its shipping container. It should be stored in a
warehouse or storage shed that has a clean, dry temperature-
stable environment where the pump and its container shall be
covered to protect it from water, dirt, vibration, etc. The cord ends
must be protected against moisture. Do not allow the pump to
freeze.
Uninstalled pumps that are idle for periods of time greater than
three months should have impellers manually rotated once a
month to lubricate the seals.
Installed pumps that are idle for long periods of time in a dry
basin should have impellers manually operated through the
breaker panel once a month to lubricate the seals. Pumps that are
idle in a wet basin must be removed.
Pump System Components
Overload Protection
LEP-Series pumps require overload protection in the control
panel. The motor control unit shall be approved and shall be
properly sized or adjusted for the full load input power indicated
on the pump nameplate. It is important to properly adjust or
select the motor control overload protection. The full load
amperes on the nameplate should be used as a baseline, but it is
important to consider that events such as supply voltage variation
or large solids passing through the pump can temporarily increase
current draw. To avoid possible nuisance tripping, it may be
necessary to adjust overloads to a value slightly higher than the
full load input power indicated on the pump nameplate.
Power and Control Cords
Do not remove cord and strain relief, and do not connect
conduit to pump.
The power and control cords are field-replaceable Quick-connect
cords. The cords shall not be spliced, although a junction box may
be used.
IMPORTANT: Each cable has a green lead. This is the ground wire
and must be grounded properly per NEC®and/or local codes.
General Information
Before installation, read these instructions carefully. Each
Liberty Pumps product is individually factory tested to
ensure proper performance. Closely following these
instructions will eliminate potential operating problems,
assuring years of trouble-free service.
These LEP-Series pumps are to be used for handling septic
tank effluent, sewage, and drain (storm) water.
Provide pump serial number in all correspondence and
reports.
Complete the Start-Up Report as installation progresses.
Completed and submitted Report is required for warranty.
Retain Report for reference.
Pumps are certified by CSA® Group to CSA and UL®
standards.
Pumps must be serviced at a qualified repair facility
approved by Liberty Pumps. No repair work should be
carried out during the warranty period without prior factory
approval. Any unauthorized field repairs void warranty.
Contact Liberty Pumps at 1-800-543-2550 to locate the
closest authorized service center.
Operating Constraints
It is extremely important to verify that the pump has been
sized correctly for the intended installation. The operating
point of the pump must lie within the acceptable range as
outlined by the applicable Liberty Pumps performance chart.
Operating the pump outside of the recommended range can
invalidate the CSA Certification of the pump and can also
cause damage and premature failure. Operating outside of
the recommended range can cause the pump to exceed its
rated nameplate amp draw, which will void the pump
certification. It can also cause motor overheating, cavitation,
excessive vibration, clogging, and poor energy efficiency.
RISK OF ELECTRIC SHOCK
RISK OF ELECTRIC SHOCK

5459000C Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5 | EN
Control Panel
All Liberty Engineered Pumps require a separate, approved pump
control panel for automatic operation. Operation of these models
will be according to the control selected; see separate operation
instructions supplied with the unit.
IMPORTANT: Verify the electrical specifications for the control
panel properly match those of the pump. When connecting an
LEP-Series pump to an existing control panel, verify the panel is
correctly sized for the pump.
Single-phase models require run capacitors. Models with internal
capacitors are factory installed; while external capacitor models
(ending in -C) require run capacitors to be installed in the control
panel. Refer to Table 1 for external model capacitors.
Wiring Instructions
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.
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.
Figure 1. Wiring Diagram (1-phase with Internal Caps)
Figure 2. Wiring Diagram (1-phase with External Caps)
Figure 3. Wiring Diagram 200/230V 3-phase
Table 1. 1-Phase External Motor Capacitor Kits
HP Component and
Specification
Liberty
Pumps
P/N
Mfg
P/N
1.5 & 2 (x2) Oil-filled Capacitors
40 µF 370 VAC K001745 CDE
SFS37T40K384B-0001
3(x2) Oil-filled Capacitors
50 µF 370 VAC K001746 CDE
SFS37T50K384B-0003
5(x2) Oil-filled Capacitors
60 µF 370 VAC K001747 CDE
SFS37T60K384B-0000
RISK OF ELECTRIC SHOCK
CAP CAP
M1
Black
M2
White
M3
Red
Ground
123 G
GRWB wiring plate
motor wires
cord plate
INTERNAL TO PUMP PANEL
POWER
CORD
White Green
Black
L2 L1
M1
Black
M2
White
M3
Red
Ground
GRWB power cord colors
CAP CAP
1G2panel lines
PANEL
INTERNAL
TO PUMP
GRWB
wiring plate
motor wires
G123
cord plate
GRWB
wiring plate
G123
cord plate
INTERNAL TO PUMP
motor wires
M1
Black &
Red
M2
Pink &
White
M3
Violet &
Blue
Ground
Brown Orange
Yellow
POWER
CORD
Red White Green
Black
L3 L2 L1
PANEL

6 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5459000C
Figure 4. Wiring Diagram 460V 3-phase
Figure 5. Wiring Diagram 575V 3-phase
Preparation
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 placementof the
control floats and should be positioned such that the motor
housing is completely submerged to properly cool the motor. 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.
Impeller Free Movement Check
Do not connect any power to pump until this check is
complete. Manually rotate the impeller to check that it spins
freely with very little resistance. The impeller can be rotated by
reaching into the pump intake. The pump can remain upright or
can be laid down on its side for easier access to the intake. Besides
verification that the impeller is freely spinning, rotating the
impeller helps to lubricate the shaft seals if the pump has been
non-operational for more than a week. It is recommended to
rotate the impeller 5–10 full rotations.
Installation
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.
Electrical Connections
With main power disconnected, complete pump and control
wiring connections per wiring diagrams included with the control
panel and Figure 1 through Figure 5 (as applicable). Verify
connections. All wires shall be checked for unintentional grounds
after connections are made.
Discharge Line
Make all discharge connections. A check valve is required to
prevent the backflow of liquid after each pumping cycle. A gate
valve should follow the check valve to allow periodic cleaning of
the check valve or removal of the pump. The remainder of the
discharge line shall be as short as possible with a minimum
number of turns, to minimize friction head loss. Do not reduce the
discharge to below the pump outlet size. Larger pipe sizes may be
required to eliminate friction head loss over long runs. Contact
Liberty Pumps or other qualified person if questions arise
regarding proper pipe size and flow rates.
Inlet Line
Connect the inlet line to the inlet hub per engineer’s
specifications.
RISK OF ELECTRIC SHOCK
Red
White
Blue
Brown
Orange
Yellow
GRWB
wiring plate
G123
cord plate
INTERNAL TO PUMP
motor wires
M1
Black
M2
Pink
M3
Violet
Ground
POWER
CORD
Red White Green
Black
L3 L2 L1
PANEL
GRWB
wiring plate
G123
cord plate
INTERNAL TO PUMP
motor wires M1
Black
M2
Pink
M3
Violet
Ground
POWER
CORD
Red White Green
Black
L3 L2 L1
PANEL
RISK OF ELECTRIC SHOCK

5459000C Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 7 | EN
3-Phase Pump Rotation Verification
Check 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). Label 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.
Guide Rail System
If guide rails are used, refer to the separate instructions supplied
with the unit for proper installation and operation, making sure all
gaskets and components are present. Contact Liberty Pumps for
available models.
If guide rails are not used, complete all pump-mounted plumbing
at this time, being sure all gaskets and components are present.
Vent
Vent basin in accordance with engineer’s specifications following
all applicable plumbing codes.
Operation
Energizing the control panel or breaker for the first time is
potentially dangerous. Licensed electrical personnel should
be present when the panel or breaker is energized for the first
time. If faults caused by damage or poor installation practices
have not been detected, serious damage, injury or death can
result when power is applied.
Starting System
1. Double check all wire connections.
2. Turn pump(s) to OFF position on H-O-A switch.
3. Turn on breakers.
4. Test each pump separately in HAND mode and observe
operation. If 3-phase pump is noisy or vibrates, rotation is
wrong. Refer to 3-Phase Pump Rotation Verification.
5. Set H-O-A switch(es) to AUTO position and allow water to rise
in basin until one pump starts. Allow pump to operate until
the level drops to turn-off point.
6. Allow basin level to rise to start other pump(s). Notice run
lights in panel. Pumps should alternate on each successive
cycle of operation.
7. Turn H-O-A switch(es) to OFF position and allow basin to fill
to the override (alarm) control level(s).
8. Observe all floats in operation to verify that there is adequate
clearance to the surrounds to ensure that the floats do not
have the opportunity to get hung up in their travel.
9. Verify alarm system response.
10. Turn switch(es) to AUTO position; pumps should start and
operate together until level drops to turn-off point.
11. Repeat this operation and cycle several times before leaving
the site.
12. Check voltage when pumps are operating and record the
amp draw of each pump. Check amps on each wire as
sometimes a high leg will exist. For excessive voltage on one
leg, the electric utility company shall be consulted.
Be certain to complete adequate testing, especially on systems
with multiple pumps or custom control configurations.
Maintenance and Troubleshooting
Accidental contact with electrically live parts, items, fluid, or
water can cause serious injury or death.
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.
Wear adequate Personal Protective Equipment when working
on pumps or piping that have been exposed to wastewater.
Sump and sewage pumps often handle materials that can
transmit illness or disease upon contact with skin and other
tissues.
Do not enter a pump basin after it has been used. Sewage and
effluent can emit several gases that are poisonous.
Replacement impellers must match the part number of
original impeller installed from the factory. Do not trim
impellers without consulting the factory.
Verify correct 3-phase pump rotation before returning to
service.
RISK OF SERIOUS INJURY OR DEATH
Correct Impeller Rotation
BOTTOM
VIEW
TOP
VIEW
RISK OF ELECTRIC SHOCK
RISK OF SERIOUS INJURY OR DEATH

8 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5459000C
Maintenance
As the motor is oil-filled, no lubrication or other maintenance is
required. If replacement lubrication is required, use ISO VG 10
turbine oil. Use approximately 1.4 gallons to just cover the upper
bearing of the motor.
Severe operating environments will require more frequent checks.
For any issues that are not resolvable, contact Liberty Pumps for
further assistance.
Monthly
Pumps that are idle for more than a month in a dry basin should
have impellers manually operated through the breaker panel
monthly to lubricate the seals. Pumps that are idle in a wet basin
must be removed.
Quarterly
1. Check pumps for corrosion and wear.
2. Check for free and unobstructed float switch operation and
float switch condition.
3. Inspect for proper check valve operation.
4. For multiple pumps, check for balanced operating times.
Uneven times indicate a defective unit, float switch or control.
5. Inspect the control panel for any presence of moisture in
enclosure, loose connections, and general component
condition.
Annually
1. Basin should be inspected and cleaned. Replace any defective
components.
Troubleshooting
No repair work shall be carried out during the warranty period
without prior factory approval. To do so may void the warranty.
Liberty Pumps, Inc. assumes no responsibility for damage or injury
due to disassembly in the field. Disassembly, other than at Liberty
Pumps or its authorized service centers, automatically voids
warranty.
Table 2. Troubleshooting Matrix
Problem Possible Cause Corrective Action
Pump does not start.
Damaged power or control cord. Replace as needed.
Control panel selector switch in OFF position. Set selector switch to Hand or Auto position.
Blown control circuit transformer fuse. Replace fuse.
Tripped circuit breaker, blown fuse, or other
interruption of power.
Reset tripped circuit breaker, replace blown fuse with
properly sized fuse, check that the unit is securely
plugged in, investigate power interruption.
Improper voltage. Have an electrician check all wiring for proper
connections and adequate voltage and capacity.
Float switch unable to move to the pump ON
position due to interference in basin or other
obstruction.
Position the pump or float switch so that it has adequate
clearance for free movement.
Insufficient liquid level. Verify the liquid level is allowed to rise enough to
activate float switch(es).
Defective float switch. Replace float switch.
Obstructed impeller or volute. Remove obstruction.
Loose wiring connections. Check and tighten all connections.
Thermal overload tripped. Wait for pump to cool to operating temperature.

5459000C Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 9 | EN
Pump does not deliver
proper capacity.
Discharge valve(s) partially closed or clogged. Check the discharge line for foreign material, including ice if the discharge line passes through or into cold
areas.
Check valve partially clogged. Raise liquid level up and down to clear; remove check
valve to remove obstruction.
Incorrect motor rotation.
1-phase internal capacitor models: contact factory.
1-phase exterior capacitor models: verify capacitor
wiring in Figure 2, else consult factory.
3-phase: correct pump rotation direction. Refer to
section 3-Phase Pump Rotation Verification.
Total head (lift height) is beyond pump's
capability. Route discharge piping to a lower level. If not possible, a larger pump may be required. Consult Liberty Pumps.
Low liquid level. Check liquid level.
Obstruction in pump or piping. Remove obstruction.
Pump does not start
and overload heaters
trip.
Unintentional ground. Turn off power and check motor leads for possible
ground.
3-phase motor winding failure. Check resistance of motor windings. All three phases
should have the same reading.
Obstructed impeller or volute. Remove obstruction.
Pump operates with
control panel selector
switch in Hand position
but does not operate in
Auto position.
Control circuits malfunctioning. Check float switch level control or the alternator relay for
issues. Replace as necessary
Check control panel.
Pump runs, but does
not turn off.
Pump is airlocked. Turn pump off and let set for several minutes, then
restart.
Control panel selector switch in Hand position. Set selector switch to Auto position.
Float switch unable to move to the pump OFF
position due to interference with the side of
basin or other obstruction.
Position the pump or float switch so that it has adequate
clearance for free movement.
Control panel failure. Check control panel.
Defective float switch. Replace float switch.
Motor stops and then
restarts after short
period but overload
heaters in starter do
not trip.
Pump operating on a short cycle due to basin
being too small. A larger basin may be required. Consult Liberty Pumps.
Pump cycles too
frequently.
Improper float switch setting. Adjust float switch setting.
Check valve not installed, stuck open, or leaking. Install check valve(s); remove check valve and examine
for freedom of operation and proper installation.
Table 2. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action

10 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5459000C
Pump runs or hums,
but does not pump.
Discharge line is blocked or restricted. Check the discharge line for foreign material, including ice if the discharge line passes through or into cold
areas.
Check valve is stuck closed or installed
backward. Remove check valve(s) and examine for freedom of operation and proper installation.
Gate or ball valve is closed. Open gate or ball valve.
Total head (lift height) is beyond pump's
capability. Route piping to a lower level. If not possible, a larger pump may be required. Consult Liberty Pumps.
Obstructed impeller or volute. Remove obstruction.
Pump is airlocked.
Turn pump off and let set for several minutes, then
restart.
Add baffle to reduce trapped air bubbles.
Capacitor failure in control panel. Check capacitors and replace if needed.
Stuck/defective motor contactor in control
panel. Replace motor contactor.
Pump is not seated correctly in guide rail base. Lift pump and re-position.
Pump operates noisily.
Piping attachments to building are too rigid. Replace a portion of the discharge line with rubber hose
or connector.
Incorrect motor rotation.
1-phase internal capacitor models: contact factory.
1-phase exterior capacitor models: verify capacitor
wiring in Figure 2, else consult factory.
3-phase: correct pump rotation direction. Refer to
section 3-Phase Pump Rotation Verification.
Pump is being run below minimum head
requirement causing cavitation. A different sized pump or impeller may be required. Consult Liberty Pumps.
Foreign objects in the impeller cavity. Clean the impeller cavity.
Broken impeller. Consult Liberty Pumps for information regarding
impeller replacement.
Pump runs periodically
when fixtures are not in
use.
Check valve not installed, stuck open, or leaking. Install check valve(s); remove check valve and examine
for freedom of operation and proper installation.
Fixtures are leaking. Repair fixtures as required to eliminate leakage.
Table 2. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action

5459000C Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 11 | EN
Repeated tripping.
Circuit protection underrated. Check rating and replace with proper size.
Current unbalance. Check current draw.
Other appliance on same circuit. Pump requires separate circuit.
Pump is connected to an extension cord or
wiring is inadequate or compromised. Have an electrician check for proper wiring.
Improper voltage. Have an electrician check all wiring for proper
connections and adequate voltage and capacity.
Obstruction in pump. Remove obstruction.
Incorrect motor rotation.
1-phase internal capacitor models: contact factory.
1-phase exterior capacitor models: verify capacitor
wiring in Figure 2, else consult factory.
3-phase: correct pump rotation direction. Refer to
section 3-Phase Pump Rotation Verification.
Foreign matter buildup. Clean motor housing.
Table 2. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action

12 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5459000C
Warranty
Liberty Engineered Products Limited Warranty
Liberty Pumps, Inc. warrants that pumps of its Engineered Product
line are free from all factory defects in material and workmanship
for a period of 18 months from the date of installation or 24
months from the date of manufacture, whichever occurs first, and
provided that such products are used in compliance with their
intended applications as set forth in the Liberty Engineered
Products specifications and technical manuals. The date of
installation shall be determined by a completed pump start-up
report and warranty registration form.
A pump startup report, filled out by a qualified installer, is
required for warranty to take effect. The report must be submitted
within 30 days from the installation date and submitted through
the Liberty Pumps website. During the warranty period, the
manufacturer's obligation, and at its discretion, shall be limited to
the repair or replacement of any parts found by the manufacturer
to be defective, provided the product is returned freight prepaid
to the manufacturer or its authorized service center, and provided
that none of the following warranty-voiding characteristics are
evident:
The manufacturer shall not be liable under this Warranty if the
product has not been properly installed or maintained in
accordance with the printed instructions provided; if it has been
disassembled, modified, abused or tampered with; if the pump
discharge has been reduced in size; if the pump has been used in
water temperatures above those shown in the specifications; if the
thermal overload(s) and seal moisture probe(s) have not been
properly connected (where equipped); if the pump has been used
in water containing sand, lime, cement, gravel or other abrasives;
if the product has been used to pump chemicals or hydrocarbons;
if the product has been moved from its original installation
location, or if the label bearing the serial and code number has
been removed.
Liberty Pumps, Inc. shall not be liable for any loss, damage or
expenses resulting from installation or use of its products, or for
consequential damages, including field labor costs, travel
expenses, rental equipment, costs of removal, reinstallation or
transportation to and from the factory or an authorized Liberty
Pumps repair facility.
There is no other express warranty. All implied warranties,
including those of merchantability and fitness for a particular
purpose, are limited to 18 months from the date of installation
or 24 months from the manufacturing date. This Warranty
contains the exclusive remedy of the purchaser, and, where
permitted, liability for consequential or incidental damages
under any and all warranties are excluded.
www.LibertyPumps.com/LEP/
Startup-WarrantyRegistration
7000 Apple Tree Avenue
Bergen, NY 14416
ph: 800-543-2550
fax: [phone]
www.LibertyPumps.com/LEP