Liberty Pumps LEPS Series User manual

Copyright © Liberty Pumps, Inc. 2021 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
1620000B
Liberty
Engineered
Pump
Systems
(LEPS)
for Ordinary and
Hazardous Locations
Common Components
Fiberglass Basin
Sewage or Grinder Pump(s)
Inlet Hub
Control Panel
Alarm System
NEMA 4X Junction Box
Pre-Mounted Float System
Factory Installed Guide Rail System

2 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 1620000B
Contents
Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 | EN
Model Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Basin Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 | EN
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 | EN
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 | EN
Maintenance and Troubleshooting . . . . . . . . . . . . . . 10 | EN
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 | EN
Safety Guidelines
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 the
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.
IMPORTANT: LEPS are a custom product and some differences
in materials, pumps, and design are unavoidable. This manual is
intended as a generic installation guideline only. Any specific
questions should be directed to Technical Customer Service at
1-800-543-2550 or email [email protected]m.
Safety Precautions
RISK OF ELECTRIC SHOCK
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.
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 208/230V pumps shall only be operated without
the float switch by using the circuit breaker or panel
disconnect.
RISK OF 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.

1620000B 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.
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.
RISK OF SERIOUS INJURY OR DEATH
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 208/230V 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.
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 enter a pump basin after it has been used. Sewage and
effluent can emit several gases that are poisonous.
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.
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.
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®.
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.
Do not exert heavy pressure or run heavy equipment on the
backfill material as this could cause the tank to collapse.

4 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 1620000B
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.
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 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.
Do not introduce any consumer item that is not toilet paper
into a non-grinder (dewatering/effluent or sewage) pump/
pump system. This includes, but is not limited to the
following: feminine products, 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.
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.
Do not allow pump to freeze.
Model Specifications
For a complete listing of models and their specifications, refer to
www.LibertyPumps.com/LEP/About/Engineering-Specs. The
pump nameplate provides a record of specific pump information.
Introduction
Pumps and control panels are supplied with their own separate
Installation/Operation manuals. Ensure receipt of these manuals,
and that they are read and understood prior to installing and
using this system. Familiarity with the pump and control panel is
critical.
This manual provides a brief overview of the system and deals
mainly with inspection and installation of the basin. It does not
cover the specifics of the pump or control panel operation. For
questions, call Liberty Engineered Products customer service at
1-800-543-2550.
Identification
Information about the LEPS can be found on a metal tag located
on the basin cover. This identifies the LEPS model number and
electrical specifications per pump, as well as system information
and date. Pump tags are located on the pump(s). Duplicate pump
tags are packaged with the system. These should be mounted on
the basin cover or the control panel for accessibility and
immediate pump information.
Inspection
Inspect the system upon arrival to ensure that there is no shipping
damage. Pay careful attention to the condition of the fiberglass
basin, control floats, pump guide rail brackets, and control panel.
Notify the carrier immediately if there is any damage.
Basin Installation
This is a brief reference to the recommended methods and
procedures for installing Liberty Pumps underground basins to
ensure that damage or premature failure of the basin does not
occur.
This section is not intended to serve as a basic instructional guide.
The installation of Liberty Pumps basins is a specialized skill and is
assumed that the individuals who install our products and refer to
this section will have basic understanding of such procedures as
excavating, backfilling, pipefitting, and electrical work. No amount
of written instruction by a manufacturer or regulatory agency will
convert an inexperienced, under-supervised laborer into a skilled,
experienced mechanic. The ability to recognize and correctly
respond to abnormal conditions during a basin installation
requires field experience as well as mechanical aptitude. Figure 1
is provided for reference.
In addition to proper system engineering and competent
manufacturing, the use of basin installers who have both practical
experience and integrity to assist that the basin be installed
properly, constitutes the greatest protection from catastrophic
basin failure and liability exposure.
Basin Handling
General Handling
Although the exterior surfaces of the fiberglass basins are
designed to withstand normal handling, they can be damaged
during transportation and installation. Basins must not be
dropped, dragged, or handled with sharp objects, and with the
exception of the minimal movement involved in a visual
inspection, must not be rolled.
Unloading, Lifting, and Lowering
RISK OF SERIOUS INJURY OR DEATH
Under no circumstances are the use of chains or cables
around the basin shell permitted.
The proper way to move a basin is by lifting it, using chains or
cables with the optional lifting lugs (not more than a 30° angle), or
by using a non-marring sling around the basin. Before any
attempt is made to move a basin, verify that all equipment and
accessories have sufficient capacity and reach to lift and lower the
basin without dragging and/or dropping. Maneuver the basin with
guide ropes attached to the sides.

1620000B Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5 | EN
Pre-Installation Inspection
Confirm adherence to the project’s specifications before
installation. Physically and visually inspected basin, pumps, valves,
equipment, and piping materials before installation. Notify the
carrier immediately if there is any damage. If the basin or any of its
internal components are damaged, suspend installation until a
determination of the extent of damage can be made by Liberty
Engineered Products or its agent. Any repairs must be first
authorized in writing by Liberty Engineered Products and then be
done in accordance with Liberty Engineered Products instructions.
Storage
Store the basin in a secure, controlled area where the potential for
accidental damage or vandalism will be minimized. The storage
area must be free from sharp objects, rocks, and any other foreign
solutions or materials that could cause damage to the basin.
Chock the basin until it is needed for installation and, if windy
conditions are possible, secure the basin with non-marring
restraints of a size and number adequate for securing the basin.
Excavation
RISK OF SERIOUS INJURY OR DEATH
Locate all overhead and underground utilities before
excavating.
Excavation Considerations
The excavation must provide adequate space for the basin, piping,
and other buried equipment, and for the replacement and
compaction of backfill materials particularly around the basin
walls. The size, shape, and wall slope of the excavation should be
determined by soil conditions, depth of excavation, shoring
requirements, and if workers are required to enter the excavation,
safety considerations and federal, state, county, and municipal
regulations.
Excavation Location
Excavation for an underground basin must be made with due care
to avoid undermining foundations of existing structures and
contact with underground utilities. In the absence of building
codes or regulations, maintain a minimum distance of 5 feet plus
a slope of 45° from the bottom of the compacted sub-base to the
bottom of the adjacent structures, foundations, footings, and
property lines. Additional distances may be required to ensure
that any loading carried or created by the foundations and
supports cannot be transferred to the basin.
Maximum Basin Burial Depth
If burial depth is greater than the basin height, contact Liberty
Engineered Products to determine if additional wall reinforcement
is required and secure written authorization.
Excavated Materials Handling
Carefully store excavated materials that cannot be removed from
the job site as far from the edge of the basin excavation as
possible. Unless approved for use as backfill, securely store
excavation materials separate from the approved backfill
materials.
Work Area Safety
Safe installation procedures are the sole responsibility of the basin
installer. Work safety requirements are defined in US Department
of Labor 29 CFR 1926, Subpart P: Excavations.
Backfill
Careful selection, placement, and compaction of approved backfill
material is critical to a successful basin installation. Among the
common problems associated with basin leaks and premature
failures are:
•Use of incorrect backfill material
•Inadequate or improper placement or compaction
•Rocks, clods, or debris left in the excavation or basin
•Voids under or around the perimeter of the basin
•Failure to prevent the migration of backfill materials
Basin Placement
RISK OF SERIOUS INJURY OR DEATH
Placement of a basin on a concrete pad or compacted
sub-base smaller than the total basin bottom area or on
intermediate supports (saddles) will cause uneven distribution
of loads. This may contribute to structural failure, and is never
permitted.
Cover the bottom of the basin excavation with suitably graded,
leveled, and compacted backfill material to a depth of at least 12”
(compacted sub-base). If a concrete hold-down/anti-flotation pad
is required, this bedding can be reduced to a depth of at least 6”.
Carefully lower the basin into the excavated area and center on
the compacted backfill or concrete pad.
Backfill Material
Ensure backfill material is clean, well granulated, free-flowing,
non-corrosive, and inert; free of ice, snow, debris, rock, or organic
material, all of which could damage the basin and interfere with
the compaction of the backfill material. The largest particles shall
not be larger than 3/4”. Not more than 3% (by weight) should
pass through a #8 sieve, and the backfill material must conform to
ASTM C-33, Paragraph 9.1 requirements. Approved backfill
materials include:
•Pea gravel, naturally rounded particles, with a minimum
diameter of 1/8” and a maximum diameter of 3/4”
•Crushed rock, washed and free-flowing angular particles
between 1/8” and 1/2” in size
Backfill Placement and Compaction
Do not exert heavy pressure or run heavy equipment on the
backfill material as this could cause the tank to collapse.
Compaction of backfill materials must be adequate to ensure the
support of the basin and to prevent movement or settlement.
Place backfill materials in 12” lifts and compacted to a minimum
soil modulus of 700 pounds per square foot.

6 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 1620000B
Support Piping, Equipment and Accessories
RISK OF SERIOUS INJURY OR DEATH
Using the basin to support any loading carried or created by
piping, equipment, cribbing, bracing, or blocking is never
permitted.
Provide support for piping, equipment, and other accessories
during backfilling. During backfilling, temporary support must be
carefully installed and removed to prevent damage to the basin,
piping, and/or equipment.
Anchorage
When basin installations are located in areas subject to high water
tables or flooding, make provisions to prevent the basin, either
empty or filled, from floating. The buoyancy force to be offset is
determined primarily by the volume of the basin. The principle
offsetting factors include:
•Backfill materials
•Concrete hold-down pad
•Friction between the basin, backfill materials, and
surrounding soil
1”
3/4”
1/2”
1/4”
30º maximum
Lifting cable or chain
Spreader bar
FINISH GRADE
Optional lifting lugs
Slope and size of excavation as per
OSHA and engineer’s specification.
In the absence of these,
consider condition of soil, depth of
excavation, and safety considerations.
Basin anti-flotation flange
Compacted sub-base and/or concrete
slab as per engineer’s specification
FINISH GRADE
12” minimum backfill compacted to a minimum
soil modulus of 700 lbs per sq ft
Fiberglass basin as required
per engineer’s specification
Backfill material
Concrete grout as required
per engineer’s specification
CAUTION:
HANDLE WITH CARE
Do NOT drop
Do NOT impact
Do NOT roll
Do NOT wrap cable or
chain around basin
Compacted sub-base minimum 12” or 6”
when used with concrete hold-down pad
Adjacent structure, foundation,
footing, or property line
In the absence of building codes or
regulations, maintain a minimum distance
of 5 feet plus a slope of 45° from the
bottom of the compacted sub-base to the
bottom of the adjacent structure’s
foundation, footing, or property line.
NOTE: The intent of these installation instructions and illustration is to ensure that damage or
premature failure to the basin does not occur. These installation instructions and illustration are not
intended to preclude normal safety procedures that should be followed to prevent injury to personnel.
SAFE INSTALLATION PROCEDURES ARE ENTIRELY THE RESPONSIBILITY OF THE INSTALLER
Pea Gravel
Crushed Roc
k
BACKFILL MATERIAL REQUIREMENTS
5’-0”
minimum
45°
minimum
Figure 1. Basin Installation Reference

1620000B Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 7 | EN
Anchorage Methods
All methods of anchoring the basin use the weight of the backfill
materials to offset the buoyancy forces. The use of supplemental
mechanical anchoring methods (i.e., a concrete hold-down pad)
increases the amount of backfill ballast, which is mechanically
attached to the basin. The recommended method of attachment is
to pour concrete grout over the basin’s anti-flotation flange and
concrete hold-down pad.
Anchorage Requirements
RISK OF SERIOUS INJURY OR DEATH
Use “submerged” material weights when calculating
anchorage requirements.
Requirements of anchorage, thickness of concrete hold-down
pads, as well as the size of anchors and reinforcement must be
calculated for each installation based on the environmental
conditions of the specific installation.
Example: weight of concrete (150 pounds per cubic foot) minus
the weight of the water (62.4 pounds per cubic foot) equals a
“submerged” weight of 87.6 pounds per cubic foot.
Preparation
Install Pump Control and Alarm Floats
LEPS are supplied with a control panel that will either use float
switches or a pressure transducer to detect the water level in the
basin. If present, the float switches are pre-mounted on a float
bracket.
Field Mounting Float Guidelines
Most LEPS leave the factory with float heights already set. If this is
not the case or floats require adjustments, follow these guidelines
to set floats in the field.
LEPS typically include a 3 float control panel in a simplex, 4 float
control panel in a duplex or 6 float control panel in a quadplex
configuration. Correct height settings for each float are critical for
optimal pump cycling and operation of the system.
Since basin heights vary with each system, use the centerline of
the inlet hub as the baseline for measuring the distance of the top
two floats (ALARM and ON). The lowest float (OFF) is measured
from the basin bottom. All distances are measured to the center of
the float cord at the attachment point on the float bracket.
Float Level Adjustment Constraints
•Do not raise the alarm float higher than 9” below the inlet
centerline or fluid will start backing up the inlet line prior to
alarm activation.
•Do not lower the OFF float below the minimum value. Pump
shutoff needs to occur while the impeller is still submersed in
fluid to prevent air entering the impeller cavity or while the
pump housing is submerged for proper cooling.
•Maintain at least a 6” minimum differential between the
bottom of the ALARM float and the bottom of the ON float.
•The ON float can be lowered or the OFF float raised to reduce
the volume per pump cycle.
•It is not recommended to make adjustments of more than 3” in
either direction. Contact Liberty Engineered Products if
adjustment is needed to the pump cycle beyond these
established levels.
•Float settings are factory set for maximum per cycle volume.
Example Float Settings:
9”
ALARM
Pump1
ON
OFF
Pump2
ON
15”
not to scale
Table 1. Typical Configurations
Model Float Level Guide Rail
System
LGV02
LGH02
2LE01–05
3LEV01–05
Pump OFF 13”
GR20
Pump1 ON Factory set
ALARM
Factory set, 
usually 6” below
Pump2 ON float
Pump2 ON 9” below inlet
centerline

8 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 1620000B
Installation
RISK OF ELECTRIC SHOCK
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, control and
alarm panel connections per wiring diagrams included with their
own Installation manuals. as applicable. Verify connections. When
complete, check all wires for unintentional ground.
3-Phase Pump Rotation Verification
Check 3-phase pumps for proper 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.
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 power OFF and
reverse any two leads. This reverses the phase sequence and
corrects the pump rotation. For 3-phase pumps, rotation must be
counter-clockwise when looking from the bottom (clockwise when
looking from top) of the pump.
Discharge
Connect Schedule 80 PVC pipe to the pump discharge. Do not
increase the discharge piping to a larger size than the pump can
handle. Do not reduce the discharge to below the pump outlet
size. The remainder of the discharge line should be as short as
possible with a minimum number of turns to minimize friction
head loss.
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.
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
(X)LGV03–15
(X)LGH03–15
Pump OFF 28”
GR3
Pump1 ON Factory set
ALARM
Factory set, 
usually 6” below
Pump2 ON float
Pump2 ON 9” below inlet
centerline
3(X)LV03–10
3(X)LM03–10
3(X)LE03–10
Pump OFF 32-1/2”
GR4
Pump1 ON Factory set
ALARM
Factory set, 
usually 6” below
Pump2 ON float
Pump2 ON 9” below inlet
centerline
Table 1. Typical Configurations
Model Float Level Guide Rail
System

1620000B Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 9 | EN
Inlet
Connect the inlet line to the inlet hub per engineer’s
specifications.
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).
System
option 1
option 2
option 3
Discharge
ground level
Sewage line
LEPS GR-Series Guide Rail System
The optional GR20, GR3 or GR4 quick-disconnect assembly guide
rail system supplied with the LEPS is designed to allow easy
installation and removal of the pump. When installed correctly, it
seals and provides a means to lift the pump without disconnecting
any of the discharge piping. Ensure installation is completed as
shown.
Hazardous location guide rail systems are available These “NS”
models (GR20NS, GR3NS, GR4NS) have identical performance to
the GR-Series models shown, except they have a bronze
(non-sparking) claw.
GR20-SERIES
Guide Rail Base Grommet Location
Rubber
sealing
grommet
Operating Position Disconnected Position
GR3-SERIES
Guide Rail Base Grommet Location
Rubber
sealing
grommet
Operating Position Disconnected Position

GR4-SERIES
Guide Rail Base Grommet Location
Rubber
sealing
grommet
Operating Position Disconnected Position
10 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 1620000B
Operation
Refer to the Startup and Operation sections provided in the
supplied pump, control panel, alarm manuals as applicable.
Maintenance and Troubleshooting
Refer to the Maintenance and Troubleshooting sections provided
in the supplied manuals.
Because an LEPS can contain a large array of components, it
would be ineffective to include a complete troubleshooting list for
each and every combination of components. The most common
causes and corrective actions are addressed in this section. For
further questions, contact customer service at 1-800-543-2550 or
[email protected].
PUMP RUNNING, BUT NOT PUMPING
Closed ball valves at street / inside tank
Ball valves may be closed initially while the system is not in
service. A closed ball valve will not allow a pump to remove
any water and would run continuously. This could cause
overheating and damage to the system. A closed ball valve
has the handle perpendicular to the valve; an open ball valve
has the handle parallel to the valve.
Check all ball valves are open and make sure that all
pumps in the system are able to evacuate water.
Pump not seated properly on guide rail base
Guide Rail Systems feature a self-aligning mounting bracket.
When properly installed, the pump will sit at an angle with
the guide rail claw seated firmly on the guide rail base. The
guide rail grommet will be compressed by the weight of the
pump. If the pump does not seat properly, the grommet will
not seal, which will result in blow-by when the pump turns
ON. The same could happen if the guide rail grommet is out
of place. This could result in the water not evacuating the
tank, longer cycle times, pump overheating, and possibly
even damage to the system.
To fix this problem, use the lifting chain or other lifting
means to move the pump into correct position with respect
to the guide rail (see LEPS GR-Series Guide Rail System).
Check voltage at panel
When pumps need to be installed long distances from a
power source, attention must be given to properly size the
wire. Considerations must be made for the pump’s required
voltage, phase, full load amps, and length of wire. Proper
sizing should be done by an electrician, although using a
sizing tool as a guide provides a close approximation. This
would be a better alternative than guessing or even worse,
using the same gauge wire as the pump was supplied with.
When insufficient wire size is used, there will be a voltage
drop across the wire (anything higher than a 3% drop would
be insufficiently sized).
To detect a voltage drop, measure the voltage at the
implementation point (usually the control panel) with the
pump running. This shows what voltage the pump is seeing.
Measuring the voltage while the pump is running provides a
good indication of the voltage drop while the pump is under
load. Pump must not be used in voltage extremes greater
than it was designed to handle.
Check pump for jam
Each sewage pump has a solids handling specification that it
is designed to pass. A grinder pump will grind any solids
into a slurry, and then pump them out. Occasionally a pump
used to pump sewage will become jammed on a large solid,
especially when it is not the intended usage. When a pump
is jammed, foreign material is keeping the impeller or cutter
(grinder pumps only) from rotating, which effectively stops
the motor. If a pump remains ON in this condition, the
pump will hum and will usually overheat itself and turn OFF
due to thermal overload.
To check for a jam, remove pump from basin. Always
disconnect the pump from electrical power before checking
for a jam. Since the pump inlet is located on the bottom of
the pump, put the pump on its side or fixture it upside down
to look at the inlet. Inspect the impeller or cutter for any
foreign material, and try to spin the motor shaft. If it is
unable to rotate, the pump is jammed. Locate the jam, and
remove whatever is restricting the impeller or cutter. A
grinder pump has such a small gap that it may require the
cutter to be hit with a screwdriver and hammer in the
reverse direction to remove any foreign material.

1620000B Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 11 | EN
PUMP NOT TURNING ON
Check control floats for obstruction
If something inside the tank obstructs the float switch from
rising, it would not be able to activate and the control panel
would not operate the pumps. This would usually result in
the high level alarm triggering or flooding. Likewise, if a float
switch is trying to drop and it cannot because it is
obstructed by another object, it would not signal the control
panel to disengage the pumps and they would run
continuously. This would result in overheating or damage to
the system.
The floats require free movement throughout their cycles.
Check for obstruction from anything inside the tank,
including the pumps and power cords.
Check control panel power
The circuit powering the controls must be separate from the
circuit powering the pumps. There will be a dedicated set of
terminals to connect power to the control circuitry. Failing to
adequately and appropriately power the controls will result
in the pumps not operating automatically.
Most panels have an LED that will turn ON when control
power is properly installed.
Check for blown control fuse
Control panels will usually have circuit breakers or other
overload protection to protect a pump from burning itself
out from overdrawing current. Similar to this, the control
circuit has its own built-in protection in the form of a fuse.
Usually there will be two circuits, one for control power and
one for alarm power. Each will have its own fuse that would
blow under a high amperage condition. If power is not
reaching the control circuitry, it is possible that the control
power fuse has blown and would need to be changed.
Check the fuse. For convenience, the control panels are
equipped with replacement fuses of the correct size on the
inside of the front door.
Troubleshoot control panel in HAND mode
Control panels should come equipped with
HAND-OFF-AUTO (H-O-A) switches that can be used to
change the operation of the control panel. The HAND mode
is for manual operation. If the control panel is set to HAND
mode, it will automatically run the pump no matter what the
current liquid level is, while the OFF mode does the
opposite. The AUTO mode is the normal operation mode. In
AUTO mode, the floats (or in some cases transducer) will
trigger the control panel to operate the pump, turning ON
when the liquid level reaches a certain height, and turning
OFF when the liquid level falls to a certain height.
If the pump is not turning ON in the AUTO mode,
troubleshoot the system by temporarily changing the
control panel to HAND mode. If the pump operates and
pumps down the liquid level, this would signify that the
problem is with water level sensing, most likely one of the
floats is not working correctly. It could be out of position,
obstructed, or defective.
Troubleshoot by adding water to the tank
Run the pump through a cycle by adding water into the
basin in order to operate the pump. If adding water is not an
option, raising the float switches by hand in the order that
they would normally raise would simulate water entering the
pit. If the pump turns ON, evacuates the water, and turns
OFF, then the system is working properly.
By raising the floats by hand or with water, it is easy to
tell if a float is not functioning depending on whether or not
it turns on its corresponding LED.
ISSUES EXCLUSIVE TO 3-PHASE SYSTEMS
Check 3-phase pump rotation
Three-phase power uses three separate alternating currents
that peak at different integrals. With a pump that is powered
by three-phase electric, the phase sequence of the motor
must match the phase sequence of the power source. When
the sequences match, the pump will operate properly.
However, when the phases are out of order, the pump will
run backward (i.e., the impeller will rotate in the wrong
direction). This will cause an extreme loss of performance
and could raise the amps drawn by the pump.
To ensure that power to the pump is installed correctly,
always check the rotation of the pump before lowering it
into the pit. The correct rotation is shown for a grinder and
sewage pump. If the pump is rotating in the wrong
direction, turn off the power and reverse any two leads (not
ground). This will reverse the phase sequence and will
correct the pump rotation.
Correct Impeller Rotation
BOTTOM VIEWTOP VIEW
Correct Impeller Rotation
BOTTOM VIEWTOP VIEW
Sewage
Grinder

12 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 1620000B
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/Warranty
7000 Apple Tree Avenue
Bergen, NY 14416
ph: 800-543-2550
fax: [phone]
www.LibertyPumps.com/LEP
Check overloads for tripping
All 3-phase control panels have overload protection set for a
certain amp rating based on the pump being used.
To reset the switch, turn to the ON position. Note that
switches come in the OFF position. They must be reset
during installation to be able to supply power to the pumps.
To check that the amp level is correct, verify with the tag
located on the pump. There will be an FLA listed on the tag.
The setting on the overload should be set at least this high,
and could be set as much as 10% or 1 amp higher,
whichever is greater. Not having this set correctly could
result in nuisance tripping of the overload, which in turn
would not allow the pump to operate.
Confirm transformer connections
Three-phase panels power the controls through a
transformer that will accept three phase power and convert
it to 120 V, 1-phase for control power. All Liberty Pumps
3-phase panels are designed to be able to run on 208 V,
240 V, 480 V, and 575 V three phase electric, and thus an
adjustable transformer is required.
To accommodate each different voltage, there is a lead to
the primary voltage tap to the transformer that needs to be
connected. This lead will come with a label to instruct which
terminal to connect to, based on which voltage is being
used. If this lead is not connected, the transformer will not
deliver power to the controls of the panel and the panel will
not be able to operate the pumps. If this lead is incorrectly
connected, the control panel circuits could be damaged.
PRESSURE SEWER APPLICATIONS
Pump runs but does not turn off
Pump cycles too frequently
Rupture or failure of discharge plumbing either inside
or outside of the basin
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 valve or replace curb stop/
swing check valve assembly.