Liberty Pumps XLE50 Series User manual

Approved for Hazardous Locations
Class I, Division 1, Groups C and D T4
Class I, Zone 1, Groups IIA and IIB T4
Installer: Manual must remain with owner or
operator/maintainer.
Prior to installation, record information
from pump nameplate for future reference:
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.
Model:
7000 Apple Tree Avenue
Bergen, NY 14416
ph: 1-800-543-2550
fax: [phone]
www.LibertyPumps.com
Serial:
Mfg Date:
Install Date:
Installation Manual 3473000C
Copyright © Liberty Pumps, Inc. 2021 All rights reserved.
Explosion-Proof Submersible Sewage Pumps
XLE-Series
Models
XLE50-Series
1/2 hp
XLE70-Series
3/4 hp
XLE100-Series
1 hp
XLE150-Series
1-1/2 hp

2 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 3473000C
Contents
Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 | EN
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Operating Constraints . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Model Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Inspection and Storage. . . . . . . . . . . . . . . . . . . . . . . . . 4 | EN
Pump System Components . . . . . . . . . . . . . . . . . . . . . 5 | EN
Wiring Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 | EN
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 | 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.
Unprotectedpowerand control(switch) cords can allow water
to wick through ends into pump or switch housings, causing
surroundings to become energized.
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.
This safety alert symbol is used in the manual
and on the pump to alert of potential risk for
serious injury or death.
This safety alert symbol identifies risk of
electric shock. It is accompanied with an
instruction intended to minimize potential
risk of electric shock.
This safety alert symbol identifies risk of fire.
It is accompanied with an instruction
intended to minimize potential risk of fire.
This safety alert symbol identifies risk of
serious injury or death. It is accompanied
with an instruction intended to minimize
potential risk of injury or death.
Warns of hazards which if not avoided will
result in serious injury or death.
Warns of hazards which if not avoided could
result in serious injury or death.
Warns of hazards which if not avoided could
result in minor or moderate injury.
Signals an important instruction related to
the pump. Failure to follow these instructions
could result in pump failure or property
damage.
Read every supplied manual before using
pump system. Follow all the safety instructions
in manual(s) and on the pump. Failure to do
so could result in serious injury or death.
RISK OF ELECTRIC SHOCK
RISK OF FIRE

3473000C Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 3 | EN
This product requires a separate, properly fused and
grounded branch circuit, sized for the voltage and amperage
requirements of the pump, as noted on the nameplate.
Overloaded branch circuit wires will get very hot and can
catch on fire. When used, electrical outlets shall be simplex of
the appropriate rating.
Sewage and effluent systems produce and may contain
flammable and explosive gases. Prevent introduction of
foreign objects into basin as sparks could ignite these gases.
Exercise caution using tools and do not use electronic devices
or have live, exposed electrical circuits in or around basins,
open covers and vents.
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.
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.
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.
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 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.
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.
All pump/pump system installations shall be in compliance
with all applicable Federal, State, and Local codes and
ordinances.
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 remove any tags or labels from the pump or its cord.
Do not enter a pump basin after it has been used. Sewage and
effluent can emit several gases that are poisonous.
Keep clear of suction and discharge openings. To prevent
injury, never insert fingers into pump while it is connected to
a power source.
This product contains chemicals known to the State of
California to cause cancer and birth defects or other
reproductive harm. www.p65warnings.ca.gov.
This pump has been evaluated for use with water only,
however use with human waste and toilet paper is permitted.
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 104°F (40°C). Operating the
pump in fluid above this temperature can overheat the pump,
resulting in pump 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.
RISK OF SERIOUS INJURY OR DEATH

4 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 3473000C
Do not run dry.
The Uniform Plumbing Code® states that sewage systems
shall have an audio and visual alarm that signals a
malfunction of the system, to reduce the potential for
property damage.
Do not position the pump float directly under the inlet from
drain tile or in the direct path of any incoming water.
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.
Keep pump upright.
Do not allow the pump to freeze.
At no time shall the pump be stored within an incomplete wet
basin. The pump shall not be placed into the basin until it can
be fully operational.
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.
Unprotectedpowerand 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
basin. The pump shall not be placed into the basin until it can
be fully operational.
Do not allow the pump to freeze.
XLE-Series pumps are shipped from the factory ready for
installation and use. Hold the pump 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 impellers manually rotated once a month to lubricate
the seals.
Installed pumps that are idle for greater than one month should
have impellers manually operated through the breaker panel once
a month to lubricate the seals. Pumps that are idle in a wet basin
must be removed.
General Information
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.
XLE-Series pumps are to be used for handling septic tank
effluent, sewage, and drain (storm) water.
Provide pump serial number in all correspondence and
reports.
Pumps are certified by CSA Group to CSA®, UL®, and FM
standards for use in hazardous locations with division
classification of Class 1, Division 1, Groups C and D; or as
zone classified Class 1, Zone 1, and Groups IIA and IIB.
Pumps must be serviced at a qualified hazardous motor
enclosure repair facility approved by Liberty Pumps. Any
unauthorized field repairs void warranty and hazardous
location ratings. Contact Liberty Pumps at 1-800-543-2550
to locate the closest authorized repair facility.
Operating Constraints
It is extremely important to verify that the pump has been
sized correctly for the intended installation. The operating
point of the pump must lie within the acceptable range as
outlined by the applicable Liberty Pumps performance chart.
Operating the pump outside of the recommended range can
invalidate the CSA Certification of the pump and can also
cause damage and premature failure. Operating outside of
the recommended range can cause the pump to exceed its
rated nameplate amp draw, which will void the pump
certification. It can also cause motor overheating, cavitation,
excessive vibration, clogging, and poor energy efficiency.
RISK OF ELECTRIC SHOCK

3473000C Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 5 | EN
Pump System Components
Control Panel
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®.
XLE-Series pumps require a separate, approved pump control
device or panel for automatic operation. Operation 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.
The control panel shall be installed outside the hazardous area
and appropriately isolated and sealed to prevent any potential
ignition or explosion. Only approved controls that have
intrinsically safe float switch connections shall be used. 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 XLE-Series pump to an
existing control panel, verify the panel is correctly sized and
equipped for the pump.
3-phase models requireoverload elements selected or adjusted in
accordance with the control instructions. The control panel shall
have provisions for the thermostat that open the motor
contactors. Do not exceed voltage/current combinations for the
thermostat: 16 Vdc/20 Amps, 115 Vac/22 Amps, 277 Vac/8 Amps,
and 600 Vac/4 Amps. All models have a surface temperature (T)
class rating of T4; however, if thermostat is not connected on
3-phase models, the T class drops to T3.
Intrinsically safe control panels designed for use with the
XLE-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.
1-phase pumps require a panel-mounted run capacitor. Refer to
Table 1.
Overload Protection
3-phase models require overload protection in accordance with
the control panel instructions. 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 select and adjust 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.
Seal Failure Probes
XLE-Series pumps are equipped with two mechanical face seals
with an oil chamber between them to provide permanent
lubrication to the seals. A seal fail or moisture sensing device is
located in the mid oil chamber and continuously monitors for
leakage. Should moisture mix with the oil, an indicator light will
illuminate on the control panel indicating a shaft seal failure has
occurred and the pump is in need of service. The pump will
continue to operate as normal but service should be scheduled as
soon as possible.
Intrinsically safe (ISS and ISD Series) panels by Liberty Pumps have
a seal leak test button that tests the integrity of the seal leak
circuit continuity. When pressed, the light should illuminate. If it
does not, either the light is burned out, the circuitry is open, or the
system does not have power.
The seal leak module is located inside the panel and requires
adjustment upon installation. See Seal leak relay setup on
page 7.
Seal fail probes connect to a relay in the control panel, which is
included in a Liberty Pumps control panel. For a non-Liberty
Pumps control panel or for a replacement relay, refer to Table 2.
RISK OF SERIOUS INJURY OR DEATH
Table 1. Capacitor Kits
Model Run Capacitor Capacitor Kit
XLE51 45 µF 370 VAC K001514
XLE52 30 µF 370 VAC K001513
XLE71 45 µF 370 VAC K001514
XLE72 30 µF 370 VAC K001513
XLE102 40 µF 370 VAC K001585
XLE152 40 µF 370 VAC K001585
Table 2. Seal Fail Replacement Relay
Description Relay
Input
Voltage
Liberty
Pumps
P/N
Macromatic
P/N
Simplex,controls
1 pump 120V K001672 SFP120A250
240V K001673 SFP240A250
Duplex, controls
2 pumps 120V K001675 SFP120C250
240V K001676 SFP240C250

6 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 3473000C
Thermostats
XLE-Series pumps are protected from overheating by thermal
switches (thermostats) located in the motor. For 1-phase models,
a hermetically sealed thermostat is mounted on the motor
windings and wired directly in series with the motor’s winding,
interrupting power in a high heat condition. 3-phase models
utilize two thermostats mounted in series directly on the motor
windings, thus monitoring the pump’s internal temperatures. The
thermostat circuit must be connected in such a way as to open the
motor contactors in the panel cutting power to the pump in an
overheat condition.
Both 1-phase and 3-phase pumps are designed to operate under
class B insulation with a maximum temperature of 266°F (130°C)
internal temperatures, even though the motors are constructed
with class F materials. Failure to use the proper circuitry and
connection of the thermostat will drop T class to T3 on 3-phase
models.
Many control panels have a manual reset button for the
thermostats on 3-phase models. This button must be pressed to
reset the system after the pump has cooled. 1-phase models
automatically reset after the pump has cooled to a safe
temperature.
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 providing it is rated for hazardous locations and has
approved cord connectors.
IMPORTANT: Each cable has a green lead. This is the ground wire
and must be grounded properly per NEC®and/or local codes.
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
RISK OF ELECTRIC SHOCK
RISK OF ELECTRIC SHOCK
WHITE WHITE
GREEN
BLACK
GREEN
GREEN
BLACK
GREEN
NOT
USED*
NOT
USED*
SEAL
LEAK
BLACK
WHITE
RED
MOTOR
BLACK
WHITE
RED
RED
WHITE
GREEN
BLACK
L2/NL1
RUN
CAP
POTTING
RESIN
SEAL
FAILURE
PROBES
CONTROL
CORD
POWER
CORD
* Note: On
1-phase
pumps, the
white and
red leads
of the
control
cord are
not used.

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Figure 2. Wiring Diagram 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 Sump [Basin]
If replacing a previously installed pump, first 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. Also, ensure that control hardware such
as floats or pressure transducers are clean, properly adjusted, and
in good working order.
Pump Control and Alarm Floats
The water level in the basin is determined by the placement of the
control floats and should be positioned such that the pump is
completely submerged. The minimum water depth to properly
cool the motor should be set as follows:
XLE50 7” from the bottom of the legs
XLE70 7” from the bottom of the legs
XLE100 9” from the bottom of the legs
XLE150 14” from the bottom of the legs
The upper water level should be positioned to minimize pump
starts. The alarm float should be above the turn on float switch but
below any inlets. No control should be set above the inlet to the
basin. Float switches must be unobstructed and maintain free
movement in basin.
Impeller Free Movement Check
Do not connect any power to pump until this check is complete.
Manually rotate the impeller to check that it spins freely with very
little resistance. The impeller can be rotated by reaching into the
pump intake. The pump can remain upright or can be laid down
on its side for easier access to the intake. Besides verification that
the impeller is freely spinning, rotating the impeller helps to
lubricate the shaft seals if the pump has been non-operational for
more than a week. It is recommended to rotate the impeller 5–10
full rotations.
Installation
All installation and maintenance of pumps, controls,
protection devices, and general wiring shall be done by
qualified personnel.
All electrical and safety practices shall be in accordance with
the National Electrical Code®, the Occupational Safety and
Health Administration, or applicable local codes and
ordinances.
Electrical Connections
With mains power disconnected, complete pump and control
wiring connections per wiring diagrams included with the control
panel and Figure 1/Figure 2 as applicable. Check all wires for
unintentional grounds after the connections are made.
Thermostat and Seal Failure Connections
Verify thermostat wires are connected in series with the contactor
and that seal fail probes are properly connected and relay
sensitivity properly adjusted. Connections are provided on the
terminal strip inside the Liberty Pumps control panel.
Seal leak relay setup: The dial should be set to 75. For best
results, turn the dial until the light turns on (around 125), then
back slowly until the light just goes out (approx. 75).
RISK OF ELECTRIC SHOCK
L3
L2
L1 BLK
PNK
VIO
RED
WHT
BLU
BRN
ORN
YEL
440–480V 3PH
L3
L2
L1 BLK
PNK
VIO
575V 3PH
BLK
PNK
VIO
RED
WHT
BLU
BRN
ORN
YEL
L3
L2
L1
208–230V 3PH
SEAL FAILURE
PROBES
MOTOR
SEAL LEAK
POWER
CORD
CONTROL
CORD
WHITE WHITE
WHITE WHITE
GREEN GREEN
RED
RED
RED
RED
WHITE
WHITE
GREEN
GREEN
BLACK
BLACK BLACK
BLACK
POTTING RESIN
L3 L2L1
THERMOSTAT
THERMOSTAT
RISK OF ELECTRIC SHOCK

8 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 3473000C
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.
3-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
leads to the pump (not ground). This reverses the phase sequence
and corrects the pump rotation. For 3-phase pumps, rotation
must be counterclockwise when looking from the bottom of the
pump. Label the wires for reconnection after installation.
Guide Rail System
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.
If guide rails are used, refer to the separate instructions supplied
with the unit for proper installation and operation. Verify all
gaskets and components are present. Use of a guide rail system
shall be of a non-sparking design. Contact Liberty Pumps for
available models, such as GR22NS-LE or GR30NS (XLE100/150
models).
If guide rails are not used, complete all pump-related plumbing
at this time. Verify all gaskets and components are present.
Pump
Record information from pump nameplate onto inside cover of
these instructions. Complete a visual inspection before lowering
into basin.
Place pump in basin, making certain the mounting interface (i.e.,
guide rail, torque stop, etc.) is engaged correctly.
Discharge
A union should be installed just above the cover to facilitate pump
removal if necessary. A check valve is required after the union 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 restrict the
discharge to below 2”. Larger pipe sizes may be required to
eliminate friction head loss over long runs. Contact Liberty Pumps
or other qualified person if there are questions regarding proper
pipe size and flow rates.
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 control panel and pump.
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 FIRE
BOTTOM VIEW
ROTATION
RISK OF SERIOUS INJURY OR DEATH

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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.
Do not enter a pump basin after it hasbeen used. Sewage and
effluent can emit several gases that are poisonous.
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.
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.
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.
Verify proper 3-phase pump rotation before retuning to
service.
Maintenance
As the motor is oil-filled, no lubrication or other maintenance is
required.
Some pumps come equipped with an air bleed hole to help
prevent airlock. A small spray of water from this hole is normal
while pump is running.
In the event the pump becomes clogged, the inlet screen can be
removed to gain access to the pump impeller. Once the
obstruction is removed, the anti-air lock hole should be cleaned.
Severe operating environments will require more frequent checks.
For any issues that are not resolvable, contact Liberty Pumps for
further assistance.
To keep the pump/pump system operating smoothly,perform the
following routine checks:
Monthly
Pumps that are idle for more than a month in a dry basin should
have impellers manually operated through the breaker panel
monthly to lubricate the seals. Pumps that are idle in a wet basin
must be removed.
Quarterly
1. Check pump(s) for corrosion and wear.
2. Check for free and unobstructed float switch operation and
float switch condition.
3. Inspect for proper check valve operation.
4. For multiple pumps, check for balanced operating times.
Uneven times indicate a defective unit, float switch or control.
5. Inspect the control panel for any presence of moisture in
enclosure, loose connections, and general component
condition.
Annually
1. Basin should be inspected and cleaned. Replace any defective
components.
Field Service on Hazardous Location Pumps
The power and control cord are not field replaceable. If either cord
is compromised, the entire pump must be brought to an
authorized hazardous motor enclosure repair facility approved by
Liberty Pumps.
The only allowable repair/replacement without compromising the
hazardous location rating of the pump is the lower shaft seal
replacement. A certified repair shop should perform this task since
they have the capability to clean and flush the mid oil chamber.
Otherwise, the pump must be returned to Liberty Pumps or an
authorized hazardous repair facility for electrical and motor
service. This will ensure the integrity of the hazardous location
rating of the pump and comply with Liberty Pumps warranty
requirements.
Troubleshooting
No repair work shall be carried out during the warranty period
without prior factory approval. To do so may void the warranty.
Liberty Pumps, Inc. assumes no responsibility for damage or injury
due to disassembly in the field. Disassembly, other than an
authorized hazardous motor enclosure repair facility approved by
Liberty Pumps or its authorized service centers, automatically
voids warranty.
RISK OF ELECTRIC SHOCK
RISK OF SERIOUS INJURY OR DEATH

10 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 3473000C
Table 3. Troubleshooting Matrix
Problem Possible Cause Corrective Action
Pump does not start.
Damaged power or control cord. Return pump to an authorized repair facility.
Control panel selector switch in Off position. Set selector switch to Hand or Auto position.
Blown control circuit transformer fuse. Replace fuse.
Tripped circuit breaker, blown fuse, or other
interruption of power. Reset tripped circuit breaker; replace blown fuse with properly sized fuse; investigate power interruption.
Improper voltage. Have an electrician check all wiring for proper
connections and adequate voltage and capacity.
Float switch unable to move to the pump ON
position due to interference in basin or other
obstruction.
Position the pump or float switch so that it has adequate
clearance for free movement.
Insufficient liquid level. Verify the liquid level is allowed to rise enough to
activate float switch(es).
Defective float switch. Replace float switch.
Obstructed impeller or volute. Remove obstruction.
Loose wiring connections. Check and tighten all connections.
Thermal overload tripped. Wait for pump to cool to operating temperature.
Pump does not start
and overload heaters
trip.
Unintentional ground. Turn off power and check motor leads for possible
ground.
3-phase motor winding failure. Check resistance of motor windings. All three phases
should have the same reading.
Obstructed impeller or volute. Remove obstruction.
Pump operates with
control panel selector
switch in Hand position
but does not operate in
Auto position.
Control circuits malfunctioning. Check float switch, level control or alternator relay for
issues. Replace as necessary.
Check control panel.
Pump runs but does not
turn off.
Pump is airlocked. Turn pump off and let set for several minutes, then
restart.
Control panel selector switch in Hand position. Set selector switch to the Auto position.
Float switch unable to move to the pump OFF
position due to interference with the side of
basin or other obstacle.
Position the pump or float switch so that switch has
adequate clearance for free movement.
Control panel failure. Check control panel.
Defective float switch. Replace float switch.
Motor stops and then
restarts after short
period but overload
heaters in starter do not
trip.
Pump operating on a short cycle due to basin
being too small. A larger basin may be required. Consult Liberty Pumps.
Pump cycles too
frequently.
Improper float switch setting. Adjust float switch setting.
Check valve not installed, stuck open, or leaking. Install check valve(s); remove check valve and examine
for freedom of operation and proper installation.

3473000C Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 11 | EN
Pump does not deliver
proper capacity.
Discharge valve(s) partially closed or clogged. Check the discharge line for foreign material, including
ice if the discharge line passes through or into cold areas.
Check valve partially clogged. Raise liquid level up and down to clear; remove check
valve to remove obstruction.
Incorrect motor rotation.
1-Phase: 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.
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 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; clogged inlet
screen. Remove obstruction.
Pump is airlocked.
Turn pump off and let set for several minutes, then
restart.
Add baffle to reduce trapped air bubbles.
Clear anti-airlock hole.
Capacitor failure in control panel. Check capacitors and replace if needed.
Stuck/defective motor contactor in control
panel. Replace motor contactor.
Pump is not seated correctly in guide rail base. Lift pump and re-position.
Pump operates noisily.
Piping attachments to building are too rigid. Replace a portion of the discharge line with rubber hose
or connector.
Incorrect motor rotation.
1-Phase: 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.
Worn bearings. Return pump to an authorized repair facility.
Table 3. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action

12 | EN Copyright © Liberty Pumps, Inc. 2021 All rights reserved. 3473000C
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.
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.
Seal fail light is
illuminated. Lower seal has been compromised. Replace lower seal.
Control panel relay sensitivity is incorrect. Adjust sensitivity dial.
Repeated tripping.
Circuit protection underrated. Check rating and replace with proper size.
Current unbalance. Check current draw.
Other appliance on same circuit. Pump requires separate circuit.
Pump is connected to an extension cord or
wiring is inadequate or compromised. Have an electrician check for proper wiring.
Improper voltage. Have an electrician check all wiring for proper
connections and adequate voltage and capacity.
Obstruction in pump. Remove obstruction.
Incorrect motor rotation.
1-Phase: Verify capacitor wiring in Figure 1, else consult
factory.
3-Phase: Correct 3-phase pump rotation direction. Refer
to section 3-Phase Pump Rotation Verification.
Table 3. Troubleshooting Matrix (continued)
Problem Possible Cause Corrective Action