Liberty Pumps LGV Series User manual

Copyright © Liberty Pumps, Inc. 2022 All rights reserved.
Installation Manual
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.
Installer: manual must remain with owner or
system operator/maintainer.
Record information from pump nameplate:
Model:
Serial:
Control Panel:
Mfg Date:
Install Date:
Dealer:
Dealer Ph:
7000 Apple Tree Avenue
Bergen, NY 14416
ph: 1-800-543-2550
fax: [phone]
www.LibertyPumps.com/LEP
60 Hz
7550000G
LGV-Series
LGH-Series
Ordinary Location Models
XLGV-Series
XLGH-Series
Approved for Hazardous Locations
Class 1, Division 1, Groups C and DT4
Class 1, Zone 1, Groups IIA and IIB T4
3–15 hp
Submersible
Grinder Pumps

2 | EN Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 7550000G
Contents
Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 | EN
Model Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Operating Constraints . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Inspection and Storage . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Pump System Components . . . . . . . . . . . . . . . . . . . . . 5 | EN
Wiring Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 | EN
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 | EN
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 | EN
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 | EN
Maintenance and Troubleshooting . . . . . . . . . . . . . . 10 | EN
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 | EN
Sa fety Guidelines
Sa fety Preca utions
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.
Unprotected power and control (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 operated without
the float switch by using the circuit breaker or panel
disconnect.
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 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
RISK OF FIRE

7550000G Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 3 | EN
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.
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.
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.
Additional Warning for Non-Hazardous Locations
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.
A grinder pump contains metal parts that rotate at high
speeds. Be careful around pump base while power is
connected. Make sure that the pump is either in the tank or
clear from people and wires when in operation.
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.
Keep clear of suction and discharge openings. To prevent
injury, never insert fingers into pump while it is connected to
a power source.
This product contains chemicals known to the State of
California to cause cancer and birth defects or other
reproductive harm. www.p65warnings.ca.gov.
Do not remove any tags or labels from the pump or its cord.
Wear Personal Protective Equipment to protect hands as
cutter blades have extremely sharp edges and present a
serious cutting hazard.
Additional Warning for Non-Hazardous Locations
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.
Additional Warning for Hazardous Locations
All electrical and motor repairs and service must be
performed by a repair facility approved by Liberty Pumps and
certified to work on explosion-proof motor enclosures.
Power and control cords are not field-replaceable unless
Liberty Pumps Quick-connect cords are used. Refer to the
Service Manual for Quick-connect cord replacement
instructions. Service for damaged power or control cords
must be performed by the factory or a repair facility approved
by Liberty Pumps and certified to work on explosion-proof
motor enclosures.
Hazardous locations contain explosive gases that can be
detonated by sparking or electric shock.
All terminations and penetrations of conduit or cable shall be
done using approved materials and methods intended for use
to mitigate the potential for explosion.
When working in a hazardous location, all precautions to
minimize ignition sources such as spark and flame should be
taken to limit the potential for fire or explosion.
Use only non-sparking tools and components in and around
basins, open covers and vents. Do not use electronic devices
that are not rated for use in hazardous locations or have live,
exposed electrical circuits in or around basins, open covers
and vents. Sewage and effluent systems produce and may
contain flammable and explosive gases and sparks could
ignite these gases.
Refer to Chapter 5 of the National Electric Code® or
applicable local codes and ordinances for all electrical and
wiring requirements in hazardous locations.
Float switches must be connected to an intrinsically safe
circuit in the control panel as per the requirements of
Chapter 5 of the National Electric Code®.
RISK OF SERIOUS INJURY OR DEATH

4 | EN Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 7550000G
All personnel shall be trained and qualified for safe work
practices and procedures.
All installations shall be in compliance with all applicable
Federal, State, and Local codes and ordinances for hazardous
locations.
All electrical terminations shall be made according to Federal,
State, and Local codes for hazardous or classified locations.
Conduit, junction boxes, and associated components shall be
approved for use with hazardous locations and installed
according to specifications.
This pump has been evaluated for use with water only,
however use with human waste and toilet paper is permitted.
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.
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.
Submersible Pump—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.
Do not allow pump to freeze.
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.
Replacement impellers must match the part number of
original impeller installed from the factory. Do not trim
impellers without consulting the factory.
Model Specifica tions
For complete listing of models and their specifications, refer to
www.LibertyPumps.com/lep/About/Engineering-Specs. Pump
nameplate provides a record of specific pump information.
Inspection a nd Stora ge
Initial Inspection
The pump should be immediately inspected for damage that may
have occurred in shipment.
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.
General Information
This manual contains important information for the safe
installation and use of this product. Make sure this manual is
provided to the owner of the equipment or to the
responsible party who maintains the system.
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. www.LibertyPumps.com/LEP/
Warranty
For ordinary locations, pumps are certified by CSA®
Group to CSA and UL® standards.
For hazardous locations, pumps are certified by CSA Group
to CSA, UL, and FM standards for use in hazardous locations
with division classification of Class 1, Division 1 Group C and
D; or as zone classified Class 1, Zone 1, and Group IIA and
IIB. Do not use in other hazardous locations.
Pumps must be serviced at a qualified hazardous motor
enclosure repair facility approved by Liberty Pumps. Any
unauthorized field repairs void warranty and hazardous
location ratings. 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.

7550000G Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 5 | EN
Storage Before Use
Protect the power and control cords from the environment.
Unprotected power and control (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 cutters and impellers manually rotated
once a month to lubricate the upper (inner) and lower (outer)
seals.
Pump System Components
Control Panel
All LEP-Series pumps require a separate, approved pump control
panel for operation. Operation of these models will be according
to the control selected; see separate operation instructions
supplied with the unit.
IMPORTANT: When connecting an LEP-Series pump to an existing
control panel, verify the panel is correctly sized and equipped for
the pump.
Control and power cords shall not be spliced, although a junction
box may be used. Verify the electrical specifications for the control
panel properly match those of the pump. 3-phase models require
overload elements selected or adjusted in accordance with the
control panel instructions.
The panel must have provisions for the thermostats that open the
motor contactors. Do not exceed voltage/current combinations
for the thermostat: 24 VAC/125 VA, and 110–600 VAC/345 VA. All
models have a temperature (T) class rating of T4 (135°C) with
thermostats connected.
1-phase pumps require a motor start circuit. Liberty Pumps
control panels for 1-phase models contain the required start
circuitry. If using a non-Liberty Pumps control panel, a start circuit
will need to be installed. Table 1 contains information on the
required Start Kit and its components. A complete kit may be
purchased, or components can be purchased separately using the
part numbers shown. Other options such as pre-wired kits are also
available.
Control Panels in Hazardous Locations
Float switches must be connected to an intrinsically safe
circuit in the control panel as per the requirements of
Chapter 5 of the National Electric Code®.
For hazardous locations, the control panel must be installed
outside the hazardous area and appropriately isolated and sealed
to prevent any potential ignition or explosion. Control and power
cords shall not be spliced; a junction box may be used providing it
is rated for hazardous locations and has approved cord
connectors. Only approved controls that have intrinsically safe
float switch connections shall be used. Failure to use the proper
circuitry and to connect the thermostat will void the T4
temperature class of the pump and will drop the temperature
class to T2 (300°C).
Thermostats
Dual seal LEP-Series motors have hermetically sealed heat sensors
(thermostats) embedded in the motor windings to detect
overheat conditions and prevent damage to the motor. The
thermostats are a normally closed (NC) switch that will open in the
presence of excessive motor temperature. The thermostats will
automatically reset when the motor has cooled to a safe
temperature. The thermostats shall be wired to interrupt power to
the motor contactor with a relay in the panel (cut power to the
motor) if the thermostats open due to motor overheating. The
pump will resume operation once the thermostats automatically
reset. If there is a need to log or monitor over-temperature events,
an external device will be needed. Tripping of the thermostats
indicates an issue that should be investigated. Liberty Pumps
control panels contain the proper circuitry to protect the motor in
the event of overheat conditions.
1-phase motors contain two thermostats and 3-phase motors
contain three thermostats, connected in series. The thermostats
are set to open at 257°F (125°C) and automatically close at 221°F
(105°C). These pumps are designed to operate under class B
thresholds with a maximum temperature of 266°F (130°C), even
though the motors are constructed with class H materials.
RISK OF ELECTRIC SHOCK
Table 1. 1-Phase Motor Start Kit
Component and
Specification
Liberty
Pumps P/N
Mfg
P/N
1-phase Start Kit
(contains all items listed
separately below)
K001864 n/a
Start Capacitor
270–324 µF 330 VAC K001905 Mars 11070 or
Equivalent
Run Capacitor
80 µF 370 VAC K001902 Mars 12199 or
Equivalent
Start Switch K001903 Stearns SINPAC
4-7-72050-15-U03
Bleed Resistor, 15k Ω, 2 W K001904 COTS
RISK OF SERIOUS INJURY OR DEATH

6 | EN Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 7550000G
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 available either permanently
potted into the cord cap or field-replaceable Quick-connect cords.
For either option, the cords shall not be spliced.
IMPORTANT: Each cord has a green lead. This is the ground wire
and shall be grounded properly per NEC and/or local codes.
Seal Failure Probes
Dual seal LEP-Series pumps have a leak detection device mounted
in an oil-filled cavity located between the two mechanical shaft
seals. The device consists of two probes with a 200k Ω resistor
mounted between them. The circuit can be tested by checking for
continuity between the seal leak wires; refer to the applicable
wiring diagram. If the lower (outer) shaft seal begins to leak and
water migrates into the cavity, it will be detected. Once a shaft seal
failure is detected, the pump will continue to operate but service
should be scheduled as soon as possible.
The LEP-Series control panels by Liberty Pumps have a seal leak
detection system with a test button that monitors the integrity of
the seal leak circuit and components. When pressed, the light
should illuminate. The light should go off when the test button is
released. If it remains on, the potentiometer is set too high. If the
light does not illuminate, the light is burned out, the circuity is
open, or the system does not have power. The seal leak relay
requires adjustment upon installation. See Seal leak relay setup
on page 10.
Seal fail probes connect to a relay in the control panel, which is
included in a Liberty Pumps control panel. For a non-Liberty
Pumps control panel or for a replacement relay, refer to Table 2.
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.
Permanent Cord 1-Phase Wiring
Pumps manufactured prior to 03/01/2021
RISK OF ELECTRIC SHOCK
Table 2. Seal Fail Replacement Relay
Description
Relay
Input
Voltage
Liberty
Pumps
P/N
Macromatic
P/N
Simplex, controls 1 pump 120V K001672 SFP120A250
Duplex, controls 2 pumps 120V K001675 SFP120C250
RISK OF ELECTRIC SHOCK
1
23
4
START SWITCH, SINPAC
CONTACTOR
START
CAPS
RUN CAP
15K
2.2K
LINE
MOTOR
SEAL
LEAK
POWER
CORD
CONTROL
CABLE
WHITE WHITE
GREEN
ORANGE
ORANGE
RED RED
WHITE
WHITE
BLUE WHITE
GREEN GREEN
BLACK
BLACK
POTTING RESIN
THERMOSTAT
THERMOSTAT
SEAL FAILURE
PROBES
GRAY GRAY

7550000G Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 7 | EN
Pumps manufactured after 03/01/2021 with C11
configuration code
Permanent Cord 3-Phase Wiring
Wire Diagrams for Motor Connections
L 1
L 2
15K
1342
ORANGE
WHITE
BLUE
GRAY GRAY
BROWN BROWN
GREEN
THERMOSTAT
SEAL FAILURE
PROBES
MOTOR
AUX MAIN
SINPAC START SWITCH
4-7-72050-15-U03
CONTROL
CABLE
POWER
CORD
GREEN
BLACK
THERMOSTAT SEAL LEAK
RED
WHITE
GREEN
BLACK
POTTING
RESIN
RED
WHITE
ORANGE
RUN CAP
80 MFD, 370 VAC
START CAP
270-324 MFD, 330 VAC
SEAL LEAK
POWER
CORD
CONTROL
CABLE
ORANGE
RED RED
WHITE WHITE
GREEN GREEN
BLACK
BLACK
THERMOSTAT
M3 M2 M1
L3
L2 L1
MOTOR
GRAY
BROWN BROWN
GREEN
GRAY
THERMOSTAT
SEAL FAILURE
PROBES
POTTING RESIN FOR
HAZLOC PUMPS
M3
M2
M1 167
248
359
200/230V 3PH (2D) 460V 3PH (1D)
15HP MODELS ONLY
M3
M2
M1 1
1
2
2
3
1
2
3
3
7
7
8
8
9
9
4
45
5
6
M3
M2
M1 1
2
3
7
8
9
4
5
6
6
M3
M2
M1
M3
M2
M1
575V 3PH
(WYE&DELTA)
200/230V
3PH (2Y) 460V 3PH (1Y)
1
2
3Start
M2
M1
1PH
LEAD NO. COLOR
2
1
3
5
6
7
8
9
J
4
blue
orange
yellow
black
purple
pink
red
gray
brown
white

8 | EN Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 7550000G
Prepara 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 basin 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. 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 all debris from the basin.
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.
When installing the pump into an existing basin with a guide rail
system, make certain the pump seats properly. Some vaults have
angled bottoms that might interfere with the pump legs. In this
application, the pump’s legs should be trimmed as required.
Liberty Pumps recommends leaving a portion of the leg so that
the pump will stand upright when placed on the floor. Refer to
Figure 1 and Figure 2.
Figure 1. Cut-off Point 3–7 hp Pumps
Figure 2. Cut-off Point 10–15 hp Pumps
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 and impeller to check that
they spin 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 and impeller 5–10 full
rotations.
Installa 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 mains power disconnected, complete pump and control
wiring connections per wiring diagrams included with the control
panel and Wiring Instructions section. Verify connections. Check
all wires for unintentional grounds after the connections are made.
RISK OF ELECTRIC SHOCK
3” [76.7 mm]
RISK OF SERIOUS INJURY OR DEATH
RISK OF ELECTRIC SHOCK
1-3/4” [44.5 mm]

7550000G Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 9 | EN
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 backward (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 basin. If the
pump is rotating in the wrong direction, turn off the power and
reverse any two of the three power leads to the pump (not the
ground). 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.
Discharge
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 should 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.
Pressure Sewer Applications
A redundant check valve assembly consisting of a curb stop and
check valve must be installed between the pump discharge and
the street main, as close to the public right-of-way as possible, on
all pressure (force main) sewer installations to protect from system
pressures. The curb stop valve is necessary to isolate the site from
the pressure sewer while the check valve provides redundant
protection against potentially detrimental backflow. All valves and
fittings should be rated for at least 200 PSI service. See Liberty
Pumps line of CSV-Series Curb Stop/Swing Check Valve
Assemblies and CK-Series Connection Kit.
Vent
The fiberglass basin provided with the system must be completely
sealed and properly vented per local health and plumbing code
requirements. If the system is to be vented through the inlet to an
existing building vent stack, there must be no traps between the
system inlet and the nearest building vent stack connection
(option 1). If this is not possible or desirable per the application, a
standalone vent can be installed in tank side (option 2) or a vent
flange or grommet can be installed in a hole cut into the cover
(option 3).
Correct Impeller Rotation
BOTTOM VIEWTOP VIEW
Bulkhead
Connection
Pump Station
Compression
Adapter
Fitting
Curb Box
Compression
Adapter
Fitting
Valve Extension
Rod Shown
Curb Stop Valve/Swing
Check Valve Assembly
To PumpTo Main
Flow
Grade
option 1
option 2
option 3
Discharge
ground level
Sewage line

10 | EN Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 7550000G
Thermostat and Seal Failure Connections
Verify thermostat wires are connected in series with the contactor,
seal fail probes are properly connected, and relay sensitivity
properly adjusted. Connections are provided on the terminal strip
inside the Liberty Pumps control panel.
Seal leak relay setup: Turn the dial completely up, connect the
leads from the pump, then push the test button. The light should
turn on. While still depressing the button, turn the dial down until
the light turns off, then turn the dial up until the light turns back
on. For best results, the potentiometer dial should be around 160.
If the pump is connected directly to a seal leak relay in the panel
(no test button), the dial should be set to around 75. Turn the
potentiometer dial clockwise until the red light turns on, then turn
the dial counterclockwise until the red light turns off. The tick
marks on the seal leak relay are for reference only.
Guide Rail System
If guide rails are used, refer to the separate installation
instructions supplied with the unit.
Guide Rail Systems in Hazardous Locations
When working in a hazardous location, all precautions to
minimize ignition sources such as spark and flame should be
taken to limit the potential for fire or explosion.
For hazardous locations, use of a guide rail system shall be of a
non-sparking design. Contact Liberty Pumps for available models.
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.
13. Complete Startup Report.
Be certain to complete adequate testing, especially on systems
with multiple pumps or custom control configurations.
Ma intena nce a nd 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.
Do not enter a pump basin after it has been used. Sewage and
effluent can emit several gases that are poisonous.
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.
Additional Warning for Hazardous Locations
Use only non-sparking tools and components in and around
basins, open covers and vents. Do not use electronic devices
that are not rated for use in hazardous locations or have live,
exposed electrical circuits in or around basins, open covers
and vents. Sewage and effluent systems produce and may
contain flammable and explosive gases and sparks could
ignite these gases.
All electrical and motor repairs and service must be
performed by a repair facility approved by Liberty Pumps and
certified to work on explosion-proof motor enclosures.
Power and control cords are not field-replaceable unless
Liberty Pumps Quick-connect cords are used. Refer to the
Service Manual for Quick-connect cord replacement
instructions. Service for damaged power or control cords
must be performed by the factory or a repair facility approved
by Liberty Pumps and certified to work on explosion-proof
motor enclosures.
RISK OF FIRE
RISK OF SERIOUS INJURY OR DEATH
RISK OF ELECTRIC SHOCK
RISK OF SERIOUS INJURY OR DEATH

7550000G Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 11 | EN
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.
Maintenance
As the motor is oil-filled, no lubrication or other maintenance is
required. If ordinary location pumps require replacement
lubrication, use ISO VG 10 turbine oil. Contact the factory for
proper replacement procedure. For Hazardous Location pumps,
removing any oil plugs needs to be done by someone who is
certified to work on Explosion Proof motors.
To keep the pump/pump system operating smoothly, perform the
following routine checks. Severe operating environments will
require more frequent checks. For any issues that are not
resolvable, contact Liberty Pumps for further assistance.
Monthly
1. 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. Limit the
lubrication run time to less than one minute per pump.
2. Pumps that are idle in a wet basin must be removed—do not
store pump in wet basin.
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.
Field Service on Hazardous Location Pumps
The only allowable repairs/replacements without compromising
the hazardous location rating of the pump are: Quick-connect
cords, lower (outer) shaft seals, volute, and impeller components.
Otherwise, the pump must be returned to Liberty Pumps or an
authorized hazardous repair facility for electrical and motor
service. This will ensure the integrity of the hazardous location
rating of the pump and comply with Liberty Pumps warranty
requirements.
Troubleshooting
Refer to Table 3 for troubleshooting guidance.
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 an
authorized motor enclosure repair facility approved by Liberty
Pumps or its authorized service centers, automatically voids
warranty.
Table 3. Troubleshooting Matrix
Problem Possible Cause Corrective Action
Pump does not start.
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; investigate power
interruption.
Improper voltage. Have an electrician check all wiring for proper
connections and adequate voltage and capacity.
Float switch is 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.

12 | EN Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 7550000G
Pump does not deliver proper
capacity.
Discharge gate valve 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: verify capacitor wiring, else consult
factory.
3-phase: correct pump rotation direction. Refer
to section 3-Phase Pump Rotation
Verification.
Low liquid level. Check liquid level.
Obstruction in pump or piping. Remove obstruction.
Total head is beyond pump's capability.
Route discharge piping to a lower level. If not
possible, a larger pump may be required.
Consult Liberty Pumps.
Pump runs but does not turn off.
Pump is airlocked. Turn pump off and let set for several minutes,
then restart.
Float switch unable to move to the PUMP OFF
position due to interference with the side of
basin or other obstacle.
Position the pump or float switch so that it has
adequate clearance for free movement.
Control panel selector switch in Hand position. Set selector switch to Auto position.
Control panel failure. Check control panel.
Defective float switch. Replace float switch.
Missing or faulty curb stop/swing check valve
allowing system pressure to feed back through
discharge piping.
Verify presence of a curb stop check valve or
replace curb stop/swing check valve assembly.
Pump operates with selector
switch in Hand position but does
not operate in Auto position.
Control circuits malfunctioning.
Check float switch, level control or alternator
relay for issues. Replace as necessary.
Check control panel.
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.
Missing or faulty curb stop/swing check valve
allowing system pressure to feed back through
discharge piping.
Verify presence of a curb stop check valve or
replace curb stop/swing check valve assembly.
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.
Seal fail light is illuminated.
Lower (outer) seal has been compromised. Replace lower seal.
Control panel relay sensitivity is incorrect. Adjust sensitivity dial.
Table 3. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action

7550000G Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 13 | EN
Motor stops and then restarts
after short period but overload
heaters in starter do not trip.
Pump may be operating on a short cycle due to
basin being too small.
A larger basin may be required. Consult Liberty
Pumps.
Water returning to basin due to leaking check
valve. Replace check valve.
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: verify capacitor wiring, else consult
factory.
3-phase: correct pump rotation direction. Refer
to section 3-Phase Pump Rotation
Verification.
Foreign matter build-up. Clean motor housing.
Rupture or failure of discharge
plumbing either inside or outside
of the basin.
Missing or faulty curb stop/swing check valve
allowing system pressure to feed back through
discharge piping.
Verify presence of a curb stop check valve or
replace curb stop/swing check valve assembly.
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.
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: verify capacitor wiring, 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.
Worn bearings. Return pump to an authorized repair facility.
High level alarm triggering.
Missing or faulty curb stop/swing check valve
allowing system pressure to feed back through
discharge piping.
Verify presence of a curb stop check valve or
replace curb stop/swing check valve assembly.
Table 3. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action

14 | EN Copyright © Liberty Pumps, Inc. 2022 All rights reserved. 7550000G
Wa rra nty
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/Warranty
Pump runs or hums but does not
pump.
Discharge line 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 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.
Table 3. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action