Liberty Pumps Omnivore LSG Series User manual

Installer: Manual must
remain with owner/operator.
Prior to installation, record information
from pump nameplate for future reference:
Model:
7000 Apple Tree Avenue
Bergen, NY 14416
ph: 1-800-543-2550
fax: [phone]
www.LibertyPumps.com
Keep this manual handy for future reference.
For replacement manual, visit LibertyPumps.com,
or contact Liberty Pumps at 1-800-543-2550.
Retain dated sales receipt for warranty.
Serial:
Mfg Date:
Install Date:
Installation Manual 5647000M
Copyright © Liberty Pumps, Inc. 2021 All rights reserved.
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.
Omnivore®2 hp Grinder Pumps
LSG and LSGX-Series
Models
LSG200-Series
Single-Stage
LSGX200-Series
2-Stage High Head

2 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5647000M
Contents
Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 | EN
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Operating Constraints . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Model Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Inspection and Storage. . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Pump Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Pump System Components . . . . . . . . . . . . . . . . . . . . . 5 | EN
Wiring Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 | EN
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 | EN
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 | EN
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 | EN
Maintenance and Troubleshooting . . . . . . . . . . . . . . . 9 | EN
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 | EN
Safety Guidelines
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.
Single-phase 208/230V pumps shall only be operated without
the float switch by using the circuit breaker or panel
disconnect.
Some products may have internal capacitors that could cause
shock. Avoid contact with plug ends after removing from
energy source.
This safety alert symbol is used in the manual
and on the pump to alert of potential risk for
serious injury or death.
This safety alert symbol identifies risk of
electric shock. It is accompanied with an
instruction intended to minimize potential
risk of electric shock.
This safety alert symbol identifies risk of fire.
It is accompanied with an instruction
intended to minimize potential risk of fire.
This safety alert symbol identifies risk of
serious injury or death. It is accompanied
with an instruction intended to minimize
potential risk of injury or death.
Warns of hazards which, if not avoided, will
result in serious injury or death.
Warns of hazards which, if not avoided, could
result in serious injury or death.
Warns of hazards which, if not avoided, could
result in minor or moderate injury.
Signals an important instruction related to
the pump. Failure to follow these instructions
could result in pump failure or property
damage.
Read every supplied manual before using
pump system. Follow all the safety
instructions in manual(s) and on the pump.
Failure to do so could result in serious injury
or death.
RISK OF ELECTRIC SHOCK

5647000M Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 3 | EN
Do not use an extension cord to power the product. Extension
cords can overload both the product and extension cord
supply wires. Overloaded wires will get very hot and can catch
on fire.
This product requires a separate, properly fused and
grounded branch circuit, sized for the voltage and amperage
requirements of the pump, as noted on the nameplate.
Overloaded branch circuit wires will get very hot and can
catch on fire. When used, electrical outlets shall be simplex of
the appropriate rating.
For cord replacement: power cord must be of the same length
and type as originally installed on the Liberty Pumps product.
Use of incorrect cord may lead to exceeding the electrical
rating of the cord and could result in death, serious injury, or
other significant failure.
Do not use this product with or near flammable or explosive
fluids such as gasoline, fuel oil, kerosene, etc. If rotating
elements inside pump strike any foreign object, sparks may
occur. Sparks could ignite flammable liquids.
Sewage and effluent systems produce and may contain
flammable and explosive gases. Prevent introduction of
foreign objects into basin as sparks could ignite these gases.
Exercise caution using tools and do not use electronic devices
or have live, exposed electrical circuits in or around basins,
open covers and vents.
These pumps are not to be installed in locations classified as
hazardous in accordance with the National Electric Code®,
ANSI/NFPA 70.
Energizing the control panel or breaker for the first time is
potentially dangerous. Licensed electrical personnel should
be present when the panel or breaker is energized for the first
time. If faults caused by damage or poor installation practices
have not been detected, serious damage, injury or death can
result when power is applied.
Do not modify the pump/pump system in any way.
Modifications may affect seals, change the electrical loading
of the pump, or damage the pump and its components.
All pump/pump system installations shall be in compliance
with all applicable Federal, State, and Local codes and
ordinances.
Do not allow children to play with the pump system.
Do not allow any person who is unqualified to have contact
with this pump system. Any person who is unaware of the
dangers of this pump system, or has not read this manual, can
easily be injured by the pump system.
In 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.
Do not enter a pump basin after it has been used. Sewage and
effluent can emit several gases that are poisonous.
Do not remove any tags or labels from the pump or its cord.
Keep clear of suction and discharge openings. To prevent
injury, never insert fingers into pump while it is connected to
a power source.
Do not use this product with flammable, explosive, or
corrosive fluids. Do not use in a flammable and/or explosive
atmosphere as serious injury or death could result.
This product contains chemicals known to the State of
California to cause cancer and birth defects or other
reproductive harm. www.p65warnings.ca.gov.
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 Personal Protective Equipment to protect hands as
cutter blades have extremely sharp edges and present a
serious cutting hazard.
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.
Check 3-phase pumps for correct rotation prior to installing
pump(s) in basin. To change rotation, reverse any two of the
three power leads to the pump (not the ground). 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 140°F (60°C). Operating the
pump in fluid above this temperature can overheat the pump,
resulting in pump failure. Maximum continuous duty fluid
temperature is 104°F (40°C).
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.
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 position the pump float directly under the inlet from
drain tile or in the direct path of any incoming water.
RISK OF FIRE
RISK OF SERIOUS INJURY OR DEATH

4 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5647000M
Submersible Pump—do not run dry
Keep pump upright.
At no time should the pump be stored within an incomplete
wet pit. The pump should not be placed into the pit until it
can be fully operational.
Do not allow the pump to freeze.
Before installation, read these instructions carefully. Each
pump is individually factory tested to ensure proper
performance. Closely following these instructions will
eliminate potential operating problems, assuring years of
trouble-free service.
The LSG/LSGX-Series pumps are to be used for handling
septic tank effluent, sewage, and drain (storm) water.
Provide pump serial number in all correspondence.
Pumps are CSA certified to CSA and UL® standards.
Pumps must be serviced at a qualified repair facility
approved by Liberty Pumps. No repair work should be
carried out during the warranty period without prior factory
approval. Any unauthorized field repairs void warranty.
Contact Liberty Pumps at 1-800-543-2550 to locate the
closest authorized service center.
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.
Model Specifications
For complete listing of models and their specifications, refer to
http://www.LibertyPumps.com/About/Engineering-Specs. Pump
nameplate provides a record of specific pump information.
Inspection and Storage
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.
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.
Do not allow the pump to freeze.
LSG/LSGX-Series Omnivore grinder pumps are shipped from the
factory ready for installation and use. The pump should 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 are covered to protect it from water, dirt,
vibration, etc. The cord ends must be protected against moisture.
Uninstalled pumps that are idle for greater than three months
should have cutters and impellers manually rotated once a month
to lubricate the seals.
Installed pumps that are idle for greater than one month should
have impellers and cutters manually operated through the breaker
panel once a month to lubricate the seals. For automatic models,
turn off the breaker, unplug the piggyback switch, and plug the
pump directly into receptacle. Turn the breaker on for 30 seconds,
then turn the breaker off. Plug the piggyback switch back in. Refer
to Piggyback Switch Operation.
Pumps that are idle in a wet basin must be removed.
Pump Design
LSG/LSGX-Series grinder pumps are designed for continuous
underwater operation. The motor and pump form a close coupled,
watertight unit. The induction motor is insulated against heat and
moisture in accordance with Class B 265°F (130°C) regulations.
A thermal overload protector is embedded in the stator windings.
This is connected in series and wired to shut down the pump if
overheating occurs. The overload switch resets automatically
when the motor cools.
The motor is protected against damage from water entry by two
seals. The lower seal is a Viton lip seal and the upper seal is a
graphite impregnated silicon carbide hard face seal.
The impeller and volute are designed for efficient flow
characteristics and clog-free operation. The hardened cutters
grind solids and fibrous matter into small particles that can be
safely pumped through small diameter piping.
General Information
Operating Constraints
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Pump System Components
Control Panel
Manual LSG/LSGX-Series pumps require a separate, approved
pump control panel for automatic operation. Operation of these
models will be according to the control selected. Refer to separate
manufacturer’s instructions supplied with the unit. Verify the
electrical specifications for the control panel properly match those
of the pump.
Mounting, installation, and wiring connections are specific to the
control panel used. Refer to the manufacturer’s instructions
supplied with the unit.
IMPORTANT: When connecting an LSG/LSGX-Series pump to an
existing control panel, verify the panel is correctly sized and
equipped for the pump.
Control panels designed for use with the LSG/LSGX-Series pumps
available from Liberty Pumps can be found at http://
www.LibertyPumps.com/Portals/0/Files/panel_selection_guide.pdf
or contact Liberty Pumps.
LSG202M-C and LSGX202M-C models require a panel-mounted
start circuit consisting of a start capacitor, run capacitor, and start
relay, which are available separately. Refer to Table 1 for these
control panel components.
Table 1. Control Panel Components 1-Phase
Required Component and
Specification Liberty Pumps P/N
208V 1-phase Start Kit
(contains 3 items listed separately below)
Start Capacitor, 200–240 µF 220 VAC
Run Capacitor, 50 µF 370 VAC
Start Relay, Mars Potential Relay 19551 #551
Overload Protection
Three-phase LSG/LSGX-Series grinder 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.
Thermostat
Single-phase pump models are protected from locked rotor and
running overloads by a thermal overload (thermostat) integrally
mounted to the motor and wired to shut down the pump if
overheating occurs. The thermostat resets automatically after the
pump has cooled.
Power and Control Cords
Do not remove cord and strain relief, and do not connect
conduit to pump.
The power and control cords cannot be spliced; a junction box
may be used.
IMPORTANT: Each cord has a green lead. This is the ground wire
and must be grounded properly per NEC®and/or local codes.
Float Switches
Pump ON and OFF cycles are controlled by float switches in the
wet well (basin). Automatic pumps have a “piggyback” float switch
attached to the side of the pump, while manual pumps have float
switches attached to the control panel. Refer to control panel or
switch instructions for proper electrical connection.
Float Sequence: Piggyback (Automatic Models)
1. As the liquid level in the basin rises, the float tilts, closing the
switch. This starts the pump.
2. The pump runs until the liquid level falls below the pump OFF
level of the float (factory set at 7 in), emptying the basin.
Float Sequence: Simplex (Manual Models)
1. As the liquid level in the basin rises, the pump OFF float tilts,
closing the switch. This level must be set at a minimum of
7 in. As the liquid level continues to rise, the pump ON float
tilts. This switch closes, starting the pump.
2. The pump runs until the liquid level falls below the pump OFF
float, emptying the basin.
3. In the event of a malfunctioning float switch, control relay, or
pump, the liquid level rises and tilts the HIGH LEVEL ALARM
float. The alarm system will activate.
Float Sequence: Duplex (Manual Models)
1. As the liquid level in the basin rises, the pump OFF float tilts,
closing the switch. As the liquid level continues to rise, the
lead pump ON float tilts. This switch closes, starting the lead
pump.
2. The pump runs until the liquid level falls below the pump OFF
float, emptying the basin.
3. On the next rise of the liquid level, the other pump will start
on the lead pump ON signal. The pumps will continue to
alternate their cycles.
Note: The ON/OFF float switch differential should be set as to
not exceed 12 starts per hour.
4. If the liquid level rises to the lag pump ON float, the second
pump will start. Both pumps will run until the liquid falls
below the pump OFF float, emptying the basin.
5. In the event of a malfunctioning float switch, control relay, or
pump, the liquid level rises and tilts the HIGH LEVEL ALARM
float. The alarm system will activate.
K001316
RISK OF ELECTRIC SHOCK

6 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5647000M
Wiring Instructions
Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
All installation and maintenance of pumps, controls,
protection devices, and general wiring shall be done by
qualified personnel.
All electrical and safety practices shall be in accordance with
the National Electrical Code®, the Occupational Safety and
Health Administration, or applicable local codes and
ordinances.
Figure 1. Wiring Diagram 1-Phase, External Capacitor
Figure 2. Wiring Connections 3-Phase
Preparation
Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
Prepare Basin
The basin required for effluent and sewage applications must be
sealed and vented to meet health and plumbing code
requirements. If replacing a previously installed pump, prepare the
basin by removing the old pump and cleaning any 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.
Pump installation should be at a sufficient depth to ensure that all
plumbing is below the frost line. If this is not feasible, remove the
check valve and size the basin and/or adjust pump differential to
accommodate the additional backflow volume. Consult Liberty
Pumps for details on how this should be done.
Pump Control and Alarm Floats
The engineering drawings will generally specify the levels for
Pump ON, Pump OFF, and HIGH LEVEL ALARM. If they are not
specified, the guidelines in Table 2 should be used to determine
float switch locations. The upper water level should be positioned
to minimize pump starts. The HIGH LEVEL ALARM float must be
above the Pump ON float but below any inlets. No float should be
set above the inlet to the basin.
System Float Levels
Factory set at float
tether 4”.
Factory set at float
tether 4”.
Level to top of motor
housing.
Minimum 1-1/2’ above
pump OFF level.
Minimum 1’ above
pump ON level and
below inlet pipe.
Level to top of motor
housing.
Minimum 1-1/2’ above
pump OFF level.
Minimum 1’ above
lead pump ON level.
Minimum 1’ above lag
pump ON level and
below inlet pipe.
Cutter and Impeller Free Movement Check
Wear Personal Protective Equipment to protect hands as
cutter blades have extremely sharp edges and present a
serious cutting hazard.
Do not connect any power to pump until this check is complete.
Manually rotate the cutter to check that it spins freely with very
little resistance. The cutter is located on the bottom of the pump.
The cutter can be carefully rotated by hand, or rotated by
inserting a tool into the cutter bolt. If rotating by hand, wear
protective gloves as the cutter and cutter plate have sharp edges.
RISK OF ELECTRIC SHOCK
RISK OF ELECTRIC SHOCK
Black (2)
Red (8)
White (7)
START CAP
RUN CAP
START
RELAY
L1
L2
5
1 2
EXTERNAL CONNECTIONS
L3
L2
L1 black
pink
violet
red
white
blue
brown
orange
yellow
440–480V 3PH
L3
L2
L1 black
pink
violet
575V 3PH
black
pink
violet
red
white
blue
brown orange
yellow
L3
L2
L1
208V/230V 3PH
Table 2. Float Switch Installation Guidelines
Piggyback Switch
(1-Float System)
OFF
ON
Simplex Pump
Station
(3-Float System)
OFF
ON
HIGH LEVEL
ALARM
Duplex Pump
Station
(4-Float System)
OFF
Lead Pump ON
Lag Pump ON
HIGH LEVEL
ALARM
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5647000M Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 7 | EN
The pump can remain upright or can be laid down on its side for
easier access to the cutter.
Besides verification that the cutter and impeller are freely
spinning, rotating the cutter helps to lubricate the shaft seals if the
pump has been non-operational for more than a week. It is
recommended to rotate the cutter 5–10 full rotations.
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.
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 manufacturer’s wiring diagrams included
with the control panel and Figure 1 (external capacitor models)/
Figure 2 (3-phase models) as applicable. Check all wires for
unintentional grounds after the connections are made.
Automatic Pump Direct Wiring
Ground
Black
Junction Box
Power
Supply
Float
Switch Pump
Green
Black
White
Green
Black
WhiteWhite
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.
Figure 3. Direct Wiring of 208/230V, 1-Phase, Automatic Pumps
The pump can run on a voltage rating of 208V or 230V. Verify that
it is the same as the supply voltage. The pump is supplied with a
6-20P (20A) cord plug end. If a 1-phase pump will be wired
directly into a junction box, it is necessary to remove the plug.
Qualified personnel shall complete the wiring in accordance with
the National Electric Code and applicable local codes. A
disconnecting means for the pump shall be located in sight from
the pump/basin location. See Figure 3 for direct wire installation
of 1-phase, automatic pumps.
3-Phase Pump Rotation Verification
BOTTOM VIEW
Check 3-phase pumps for correct rotation prior to installing
pump(s) in basin. To change rotation, reverse any two of the
three power leads to the pump (not the ground). Code the
wires for reconnection after installation.
Three-phase power uses three
separate alternating currents that
peak at different integrals. With
pumps that are powered by three
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 power leads. This reverses the phase sequence
and corrects the pump rotation. Rotation must be
counterclockwise when looking from the bottom of the pump.
Piggyback Switch Operation
GG
6-20R 6-20P
IMPORTANT: Verify breaker is turned off before plugging in the
switch.
Plug the piggyback switch into a 6-20R receptacle.
The receptacle must be wired to a 30 Amp breaker.
Plug the pump into the piggyback receptacle.
Install cable clamp for strain relief.
Install cable
clamp to wall
for strain relief
Temporary Manual
O
p
eration
YES!NO!
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8 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5647000M
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.
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
Guide Rail System
If guide rails are used, refer to the separate instructions supplied
with the unit for proper installation and operation, making sure all
gaskets and components are present. Liberty Pumps GR20 Guide
Rail System features a self-aligning mounting bracket. Contact
Liberty Pumps for more information.
If guide rails are not used, complete all pump-mounted plumbing
at this time, being sure all gaskets and components are present.
Pump
Record information from pump nameplate onto the cover of these
instructions. Complete a visual inspection before lowering into
basin.
Place pump in basin being sure the mounting interface (i.e., guide
rail, torque stop) is engaged correctly.
Vent
Vent basin in accordance with applicable plumbing codes.
Operation
Energizing the control panel or breaker for the first time is
potentially dangerous. Licensed electrical personnel should
be present when the panel or breaker is energized for the first
time. If faults caused by damage or poor installation practices
have not been detected, serious damage, injury or death can
result when power is applied.
Starting System
1. Verify all plumbing components in the basin are installed
correctly and functional. Verify all valves are open and ready
for pump use.
2. Double check all wire connections. Re-tighten all factory and
field connections.
3. Ensure pump has no obstructions.
4. With all electrical and mechanical connections complete and
secure, turn on power to pump and control panel, if
applicable.
5. Verify operation of the pump, floats, and alarm circuits.
6. Run several cycles of water through the system to verify
correct control operation for the installation.
Be certain to complete adequate testing, especially on systems
with multiple pumps or custom control configurations.
RISK OF SERIOUS INJURY OR DEATH

5647000M Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 9 | EN
Maintenance and Troubleshooting
Accidental contact with electrically live parts, items, fluid, or
water can cause serious injury or death.
Always disconnect pump(s) from power source(s) before
handling or making any adjustments to either the pump(s),
the pump system, or the control panel.
Wear adequate Personal Protective Equipment when working
on pumps or piping that have been exposed to wastewater.
Sump and sewage pumps often handle materials that can
transmit illness or disease upon contact with skin and other
tissues.
Do not enter a pump basin after it has been used. Sewage and
effluent can emit several gases that are poisonous.
Verify correct 3-phase pump rotation before retuning to
service.
Maintenance
As the motor is oil-filled, no lubrication or other maintenance is
required. If replacement lubrication is required, use ISO VG 10
turbine oil. Use approximately 0.8 gallons to just cover the upper
bearing of the motor.
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.
2. Pumps that are idle in a wet basin must be removed.
Quarterly
1. Check pump 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. Inspect and clean basin. Replace any defective components.
Troubleshooting
Refer to Table 3 for help troubleshooting issues.
No repair work shall be carried out during the warranty period
without prior factory approval. To do so may void the warranty.
Liberty Pumps, Inc. assumes no responsibility for damage or injury
due to disassembly in the field. Disassembly, other than at Liberty
Pumps or its authorized service centers, automatically voids
warranty.
RISK OF ELECTRIC SHOCK
RISK OF SERIOUS INJURY OR DEATH
Table 3. Troubleshooting Matrix
Problem Possible Cause Corrective Action
Pump does not start.
Damaged power or control cord. Replace as needed.
Control panel selector switch in OFF position. Set selector switch to Hand or Auto position.
Blown control circuit transformer fuse. Replace fuse.
Tripped circuit breaker, tripped GFCI, blown fuse,
or other interruption of power.
Reset tripped circuit breaker, reset GFCI, replace blown
fuse with properly sized fuse, check that the unit is
securely plugged in, investigate power interruption.
Improper voltage. Have an electrician check all wiring for proper
connections and adequate voltage and capacity.
Float switch unable to move to the pump ON
position due to interference in basin or other
obstruction.
Position the pump or float switch so that switch 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.

10 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5647000M
Pump does not start.
Loose wiring connections. Check and tighten all connections.
Thermal overload tripped. Wait for pump to cool to operating temperature.
Water inside motor.
Check/replace oil, oil plug, and sealing washer as needed.
Damaged lower lip seal or mechanical seal. Replace seal.
Replace oil as needed.
Damaged O-ring between oil chamber and motor plate.
Return to authorized repair facility for O-ring and oil
replacement.
Damaged cord. Replace as needed.
Pump does not start
and overload heaters
trip.
Unintentional ground. Turn off power and check motor leads for possible
ground.
3-phase motor winding failure. Check resistance of motor windings. All three phases
should have the same reading.
Obstructed impeller or volute. Remove obstruction.
Pump operates with
control panel selector
switch in Hand position
but does not operate in
Auto position.
Control circuits malfunctioning.
Check float level control or the alternator relay for issues.
Check control panel.
Pump runs but does not
turn off.
Pump is airlocked. Turn pump off and let set for several minutes, then
restart.
Control panel selector switch in Hand position. Set selector switch to Auto position.
Float switch unable to move to the pump OFF
position due to interference with the side of
basin or other obstruction.
Position the pump or float switch so that it has adequate
clearance for free movement.
Control panel failure. Check control panel.
Defective float switch. Replace float switch.
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 deliver
proper capacity.
Discharge valve(s) partially closed or clogged. Check the discharge line for foreign material, including
ice if the discharge line passes through or into cold areas.
Check valve partially clogged. Raise liquid level up and down to clear; remove check
valve to remove obstruction.
Incorrect motor rotation.
1-phase internal capacitor models: contact factory.
1-phase exterior capacitor models: verify capacitor wiring
in Figure 1, else consult factory.
3-phase: Correct 3-phase pump rotation direction. Refer
to section 3-Phase Pump Rotation Verification.
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.
Low liquid level. Check liquid level.
Obstruction in pump or piping. Remove obstruction.
Table 3. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action

5647000M Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 11 | EN
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.
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 runs or hums, but
does not pump.
Discharge line is blocked or restricted. Check the discharge line for foreign material, including
ice if the discharge line passes through or into cold areas.
Check valve is stuck closed or installed backward. Remove check valve(s) and examine for freedom of
operation and proper installation.
Gate or ball valve is closed. Open gate or ball valve.
Total head 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.
Repeated tripping.
Circuit protection underrated. Check rating and replace with proper size.
Current unbalance. Check current draw.
Other appliance on same circuit. Pump requires separate circuit.
Pump is connected to an extension cord or
wiring is inadequate or compromised. Have an electrician check for proper wiring.
Improper voltage. Have an electrician check all wiring for proper
connections and adequate voltage and capacity.
Obstruction in pump. Remove obstruction.
Incorrect motor rotation.
1-phase internal capacitor models: contact factory.
1-phase exterior capacitor models: verify capacitor wiring
in Figure 1, else consult factory.
3-phase: Correct 3-phase pump rotation direction. Refer
to section 3-Phase Pump Rotation Verification.
Foreign matter buildup. 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.
Table 3. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action

12 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5647000M
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 and “Commercial Series” models). 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.
*Liberty Pumps, Inc. warrants StormCell®batteries for 1 year from date of purchase, and warrants that pumps of its Commercial Series
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 technical specifications and manuals.
Motor stops and then
restarts after short
period but overload
heaters in starter do not
trip.
Pump operating on a short cycle due to basin
being too small. A larger basin may be required. Consult Liberty Pumps.
Pump operates noisily.
Piping attachments to building are too rigid. Replace a portion of the discharge line with rubber hose
or connector.
Incorrect motor rotation.
1-phase internal capacitor models: contact factory.
1-phase exterior capacitor models: verify capacitor wiring
in Figure 1, else consult factory.
3-phase: Correct 3-phase pump rotation direction. Refer
to section 3-Phase Pump Rotation Verification.
Pump is being run below minimum head
requirement causing cavitation.
A different sized pump or impeller may be required.
Consult Liberty Pumps.
Foreign objects in the impeller cavity. Clean the impeller cavity.
Broken impeller. Consult Liberty Pumps for information regarding impeller
replacement.
Pump runs periodically
when fixtures are not in
use.
Check valve not installed, stuck open, or leaking. Install check valve(s); remove check valve and examine
for freedom of operation and proper installation.
Fixtures are leaking. Repair fixtures as required to eliminate leakage.
Table 3. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action