Liberty Pumps EPS User manual

Installation Manual
7000 Apple Tree Avenue
Bergen, NY 14416
ph: 800-543-2550
fax: [phone]
www.LibertyPumps.com
Copyright © Liberty Pumps, Inc. 2019 All rights reserved.
7298000D
IMPORTANT: Liberty Pumps EPS 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 800-543-2550 or email [e-mail].
Engineered Pump Systems (EPS)
for Ordinary and Hazardous Locations
Common Components:
• Fiberglass Basin (Tank)
• Sump, Effluent, Sewage or Grinder Pump(s)
• Factory Installed Guide Rail System
• Pre-Mounted Float System
• NEMA 4X Junction Box
• Inlet Hub
• Control Panel or Alarm System

– 2 – Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 7298000D
Contents
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Model Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Basin Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Maintenance and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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 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.
Installer: manual must remain with owner or system operator/maintainer.
Record information from pump nameplate:
Keep this manual handy for future reference.
Pump Model #:
For replacement manual, visit LibertyPumps.com,
or contact Liberty Pumps at 800-543-2550. Pump Serial #:
Retain dated sales receipt for warranty.
System #:
Manufacture Date:
Install Date:

7298000D Copyright © Liberty Pumps, Inc. 2019 All rights reserved. – 3 –
Safety Precautions
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.
Additional Warnings 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.
Do not remove power supply or control cord. All electrical
and motor repairs and service must be performed by the
factory or a repair facility approved by Liberty Pumps and
certified to work on explosion-proof motor enclosures.
Refer to Chapter 5 of the National Electric Code® or
applicable local codes and ordinances for all electrical and
wiring requirements in hazardous locations.
Do not use an extension cord to power the product.
Extension cords can overload both the product and extension
cord supply wires. Overloaded wires will get very hot and can
catch on fire.
This product requires a separate, properly fused and
grounded branch circuit, sized for the voltage and amperage
requirements of the pump, as noted on the nameplate.
Overloaded branch circuit wires will get very hot and can
catch on fire.
For cord replacement: power cord must be of the same
length and type as originally installed on the Liberty Pumps
product. Use of incorrect cord may lead to exceeding the
electrical rating of the cord and could result in death, serious
injury, or other significant failure.
Do not use this product with or near flammable or explosive
fluids such as gasoline, fuel oil, kerosene, etc. If rotating
elements inside pump strike any foreign object, sparks may
occur. Sparks could ignite flammable liquids.
Sewage and effluent systems produce and may contain
flammable and explosive gases. Prevent introduction of
foreign objects into basin as sparks could ignite these gases.
Exercise caution using tools and do not use electronic devices
or have live, exposed electrical circuits in or around basins,
open covers and vents.
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.
Additional Warnings for Hazardous Locations
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.
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.
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.
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.
RISK OF ELECTRIC SHOCK
RISK OF FIRE

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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.
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 208/230 V 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 gases alleviates poisonous gas buildup and reduces the
risk of explosion and fire from these flammable gases.
Wear adequate Personal Protective Equipment when working
on pumps or piping that have been exposed to wastewater.
Sump and sewage pumps often handle materials that can
transmit illness or disease upon contact with skin and other
tissues.
Do not enter a pump basin after it has been used. Sewage
and effluent can emit several gases that are poisonous.
Do not remove any tags or labels from the pump or its cord.
Keep clear of suction and discharge openings. To prevent
injury, never insert fingers into pump while it is connected to
a power source.
This product contains chemicals known to the State of
California to cause cancer and birth defects or other
reproductive harm. www.p65warnings.ca.gov.
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.
Additional Warnings 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.
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.
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.
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 exert heavy pressure or run heavy equipment on the
backfill material as this could cause the tank to collapse.
Do not allow pump to freeze.
Introduction
Pumps and control panels are supplied with their own separate
Installation/Operation/Maintenance manual(s). 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 Pumps customer service at 800-543-2550.
Identification
Information about the EPS can be found on a stamped metal tag
that is located on the basin cover. This identifies the EPS model
number as well as the horsepower, voltage, and amp draw for the
pump(s). 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 at the control panel for accessibility and
immediate pump information.
Figure 1. Nameplate Example
RISK OF SERIOUS INJURY OR DEATH

7298000D Copyright © Liberty Pumps, Inc. 2019 All rights reserved. – 5 –
Model Specifications
For a complete listing of models and their specifications, refer to
http://www.LibertyPumps.com/About/Engineering-Specs. The
pump nameplate provides a record of specific pump information.
Basin Installation
This is a brief reference to the recommended methods and
procedures for installing Liberty Pumps underground sump and
sewage 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 sump and sewage 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. Figure2
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
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.
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
Pumps or its agent. Any repairs must be first authorized in writing
by Liberty Pumps and then be done in accordance with Liberty
Pumps 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
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
Pumps to determine if additional wall reinforcement is required
and secure written authorization.
Excavated Materials Handling
Carefully store excavated materials, which 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.
RISK OF SERIOUS INJURY OR DEATH
RISK OF SERIOUS INJURY OR DEATH

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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
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
Make certain that compaction of backfill materials is 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.
Support Piping, Equipment and Accessories
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
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
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.
RISK OF SERIOUS INJURY OR DEATH
RISK OF SERIOUS INJURY OR DEATH
RISK OF SERIOUS INJURY OR DEATH

7298000D Copyright © Liberty Pumps, Inc. 2019 All rights reserved. – 7 –
Figure 2. Basin Installation Reference
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

– 8 – Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 7298000D
Preparation
Install Pump Control and Alarm Floats
EPS are commonly 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 QuickTree®. For QuickTree removal, loosen the cord nut and
pull the QuickTree straight out of the basin.
Field Mounting Float Guidelines
Most EPS 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.
EPS typically include a 3 float control panel in a simplex or 4 float
control panel in a duplex configuration. Correct height settings for
each float are critical for optimal pump cycling and operation of
the system.
Since EPS 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
tree.
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 13” minimum. Pump
shutoff needs to occur while the impeller is still submersed in
fluid to prevent air entering the impeller cavity.
•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 Pumps if adjustment is
needed to the pump cycle beyond these recommended levels.
3-Float Settings for Maximum Per-cycle Volume
Make note of the inlet height.
1. ALARM float (highest) 9” from centerline of inlet to float cord.
2. ON float (middle) 15” from centerline of inlet to float cord.
3. OFF float (lowest) 13” from bottom of basin to float cord.
Figure 3. Float Settings
15”
9”
ALARM
ON
OFF
13”

7298000D Copyright © Liberty Pumps, Inc. 2019 All rights reserved. – 9 –
Installation
All installation and maintenance of pumps, controls,
protection devices, and general wiring shall be done by
qualified personnel.
All electrical and safety practices shall be in accordance with
the National Electrical Code®, the Occupational Safety and
Health Administration, or applicable local codes and
ordinances.
Electrical Connections
With main power disconnected, complete pump and control
wiring connections per wiring diagrams included with the control
panel. 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 Line
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.
Inlet Line
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. The system is designed to be vented through the
inlet to an existing building vent stack. In order to accomplish this,
there must be no traps between the system inlet and the nearest
building vent stack connection. If this is not possible or desirable
per the application, a vent flange or grommet can be installed in a
hole cut into the cover.
Figure 4. Venting Example
RISK OF ELECTRIC SHOCK
SYSTEM
VENT
DISCHARGE
WATER
CLOSET
SEWAGE LINE

– 10 – Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 7298000D
GR-Series Guide Rail System
The optional GR20, GR22 or GR30 quick-disconnect assembly
guide rail system provided with the EPS system is designed to
allow easy installation and removal of the pump. When installed
correctly, it will seal and provide a means to lift the pump without
disconnecting any of the discharge piping. Ensure installation is
done as shown.
Hazardous location guide rail systems are available from Liberty
Pumps. These “NS” models (GR20NS, GR22NS, GR30NS) have
identical performance to the GR-Series models shown, except
they have a bronze (non-sparking) claw.
GR20-Series GR22-Series GR30-Series
Guide Rail Base
Grommet
Location
Operating
Position
Disconnected
Position
Grommet comes
greased and
installed
Rubber sealing
grommet
Rubber
sealing
grommet
Rubber
sealing
grommet
1-1/4” DISCHARGE PIPE
1-1/4” GUIDE RAIL PIPE
2” DISCHARGE PIPE
1-1/4” GUIDE RAIL PIPE
3” DISCHARGE PIPE
1-1/4” GUIDE RAIL PIPE

7298000D Copyright © Liberty Pumps, Inc. 2019 All rights reserved. – 11 –
Operation
Refer to the Startup and Operation sections provided in the
supplied pump and control panel manuals.
Maintenance and Troubleshooting
Refer to the Maintenance and Troubleshooting sections provided
in the supplied pump and control panel manuals.
Because an EPS 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 800-543-2550 or
[email protected].
PUMP RUNNING, BUT NOT PUMPING
Open valves at street
Many times ball valves are left closed after installation and
before the system is in use. Because there can be multiple
contractors or installers involved on a project, this can be
missed when the system is finally in use. With the ball valves
closed, the pump cannot remove water and will run
continuously. This could cause flooding, overheating, and
damage to the system.
To prevent this from happening, observe a complete cycle
to confirm pump can remove water.
Open ball valves inside tank
EPS come equipped with ball valves for servicing. Ball valves
should come from the factory in the OPEN position, but an
installer may close them 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 before applying power to the system
and perform a test run to make sure that all pumps in the
system are able to evacuate water.
Ensure pump is positioned correctly on guide rail base
Liberty Pumps 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 gasket will be compressed by
the weight of the pump. If the pump does not seat properly,
the gasket will not seal, which will result in blow-by when
the pump turns ON. The same could happen if the guide rail
gasket 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, pull on the lifting chain to move the
pump into correct position with respect to the guide rail (see
GR-Series Guide Rail System on page 10).
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 idea 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, some 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, the pump must be removed from the
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.

– 12 – Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 7298000D
PUMP NOT TURNING ON
Check control floats are unobstructed and operating
properly
Most EPS come with control panels to operate the pumps.
These panels commonly make use of float switches to send
a signal back to the panel. The floats will be positioned at
various levels to accomplish the intended pump cycle. As
the water level raises, the floats will rise as well on their
tether and activate a switch located inside the float. If
something inside the tank obstructs the float 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
and can get obstructed by anything inside the tank,
including the pumps and power cords.
Check for control panel power
Control panels utilize a complex series of circuits to properly
control the duty cycles of the pumps. These circuits must be
powered, commonly with 120 V, single phase electric. 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
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.
Attempt to run pump manually with control panel
All 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. The OFF mode does the opposite.
When the control panel is set to OFF mode, it will not run
the pump no matter what the liquid level is. 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.
Attempt to run pump automatically by HAND or by
adding water to the tank
Liberty Pumps systems are meant to run automatically. The
pump would be controlled by an automatic float switch or
through a control panel that would utilize either float
switches or a pressure transducer. After installing a pump
system, 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. This
same method can be used to troubleshoot a pump that is
not turning ON some time after installation. An advantage
of using a control panel is that commonly each float would
have its own LED inside the panel.
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.
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.
To check the fuse, there is plastic fuse holder that needs to
be loosened and then pulled out. Turn this knob
counterclockwise to loosen and pull the fuse holder out. If
the fuse has blown, it will appear blackened and burnt. For
the user’s convenience, the control panels are equipped with
replacement fuses of the correct size on the inside of the
front door.

7298000D Copyright © Liberty Pumps, Inc. 2019 All rights reserved. – 13 –
PROBLEMS 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 below 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.
Check overloads for tripping
All 3-phase panels have overload protection included inside
the control panel enclosure, usually located directly adjacent
to the motor contactors. These switches are set for a certain
amp rating based on the pump being used. The switches are
in the horizontal position when tripped (OFF).
To reset the switch, turn the knob clockwise into a vertical
position. Note that switches come in the OFF position. They
must be reset during installation to be able to supply power
to the pumps.
BOTTOM VIEW
ROTATION
ROTATIONKICKBACK
BOTTOM VIEW
SewageGrinder
Check overload amp level
All 3-phase panels have overload protection included inside
the control panel enclosure, usually located directly adjacent
to the motor contactors. These switches are set for a certain
amp rating based on the pump being used. Underneath a
clear screen on the overload there is a dial that represents
the set value of the amp level that overloads are set to. This
amp level should represent the full load amps (FLA) of the
pump being connected to the control panel.
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 that transformer connections were made
Liberty Pumps 3-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, and 480 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.

– 14 – Copyright © Liberty Pumps, Inc. 2019 All rights reserved. 7298000D
Warranty
Liberty Pumps Wholesale Products Limited Warranty
Liberty Pumps, Inc. warrants that Liberty Pumps wholesale products are free from all factory defects in material and workmanship for a
period of three (3) years from the date of purchase (excluding batteries). The date of purchase shall be determined by a dated sales
receipt noting the model and serial number of the pump. The dated sales receipt must accompany the returned pump if the date of
return is more than three years from the date of manufacture noted on the pump nameplate.
The manufacturer's sole obligation under this Warranty shall be limited to the repair or replacement of any parts found by the
manufacturer to be defective, provided the part or assembly 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, operated, or maintained per
manufacturer instructions; if it has been disassembled, modified, abused, or tampered with; if the electrical cord has been cut, damaged,
or spliced; if the pump discharge has been reduced in size; if the pump has been used in water temperatures above the advertised rating;
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, grease, or hydrocarbons; if a non-submersible motor has been subjected to moisture; or if the label bearing the model and
serial 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 indirect,
incidental, and consequential damages, including costs of removal, reinstallation or transportation.
There is no other express warranty. All implied warranties, including those of merchantability and fitness for a particular purpose, are
limited to three years from the date of purchase. 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.
7000 Apple Tree Avenue
Bergen, NY 14416
ph: 800-543-2550
fax: [phone]
www.LibertyPumps.com